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gerrit-public.fairphone.software / platform / external / ComputeLibrary / 0e205f7e1083bf26e6ffc33d96005999b541b8f9 / . / documentation / warp__perspective_8cl.xhtml
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Anthony Barbierdbdab852017-06-23 15:42:00 +0100[diff] [blame]10<title>Compute Library: src/core/CL/cl_kernels/warp_perspective.cl File Reference</title>
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98<div class="header">
99 <div class="summary">
100<a href="#func-members">Functions</a> </div>
101 <div class="headertitle">
102<div class="title">warp_perspective.cl File Reference</div> </div>
103</div><!--header-->
104<div class="contents">
Jenkinsb9abeae2018-11-22 11:58:08 +0000[diff] [blame]105<div class="textblock"><code>#include &quot;<a class="el" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml">helpers.h</a>&quot;</code><br />
Anthony Barbier8140e1e2017-12-14 23:48:46 +0000[diff] [blame]106<code>#include &quot;<a class="el" href="warp__helpers_8h_source.xhtml">warp_helpers.h</a>&quot;</code><br />
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]107</div>
108<p><a href="warp__perspective_8cl_source.xhtml">Go to the source code of this file.</a></p>
109<table class="memberdecls">
110<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
111Functions</h2></td></tr>
112<tr class="memitem:aa02a47b9dfa96a2705d5c77044a40048"><td class="memItemLeft" align="right" valign="top">const float16&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__perspective_8cl.xhtml#aa02a47b9dfa96a2705d5c77044a40048">build_perspective_mtx</a> ()</td></tr>
Anthony Barbier8140e1e2017-12-14 23:48:46 +0000[diff] [blame]113<tr class="memdesc:aa02a47b9dfa96a2705d5c77044a40048"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the perspective matrix. <a href="#aa02a47b9dfa96a2705d5c77044a40048">More...</a><br /></td></tr>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]114<tr class="separator:aa02a47b9dfa96a2705d5c77044a40048"><td class="memSeparator" colspan="2">&#160;</td></tr>
115<tr class="memitem:a2791d623c1dbcf7e7111b8ff1b7daeeb"><td class="memItemLeft" align="right" valign="top">const float8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__perspective_8cl.xhtml#a2791d623c1dbcf7e7111b8ff1b7daeeb">apply_perspective_transform</a> (const float2 coord, const float16 mtx)</td></tr>
Anthony Barbier8140e1e2017-12-14 23:48:46 +0000[diff] [blame]116<tr class="memdesc:a2791d623c1dbcf7e7111b8ff1b7daeeb"><td class="mdescLeft">&#160;</td><td class="mdescRight">Transforms four 2D coordinates using the formula: <a href="#a2791d623c1dbcf7e7111b8ff1b7daeeb">More...</a><br /></td></tr>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]117<tr class="separator:a2791d623c1dbcf7e7111b8ff1b7daeeb"><td class="memSeparator" colspan="2">&#160;</td></tr>
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]118<tr class="memitem:ab8f5d79d7699ec7e2a805a25ca0fca2b"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__perspective_8cl.xhtml#ab8f5d79d7699ec7e2a805a25ca0fca2b">warp_perspective_nearest_neighbour</a> (__global uchar *in_ptr, uint in_stride_x, uint in_step_x, uint in_stride_y, uint in_step_y, uint in_offset_first_element_in_bytes, __global uchar *out_ptr, uint out_stride_x, uint out_step_x, uint out_stride_y, uint out_step_y, uint out_offset_first_element_in_bytes, const int width, const int height)</td></tr>
Anthony Barbier8140e1e2017-12-14 23:48:46 +0000[diff] [blame]119<tr class="memdesc:ab8f5d79d7699ec7e2a805a25ca0fca2b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Performs perspective transformation on an image interpolating with the NEAREAST NEIGHBOUR method. <a href="#ab8f5d79d7699ec7e2a805a25ca0fca2b">More...</a><br /></td></tr>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]120<tr class="separator:ab8f5d79d7699ec7e2a805a25ca0fca2b"><td class="memSeparator" colspan="2">&#160;</td></tr>
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]121<tr class="memitem:a5dba6d401b54fd02d20a2ba246668d93"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__perspective_8cl.xhtml#a5dba6d401b54fd02d20a2ba246668d93">warp_perspective_bilinear</a> (__global uchar *in_ptr, uint in_stride_x, uint in_step_x, uint in_stride_y, uint in_step_y, uint in_offset_first_element_in_bytes, __global uchar *out_ptr, uint out_stride_x, uint out_step_x, uint out_stride_y, uint out_step_y, uint out_offset_first_element_in_bytes, const int width, const int height)</td></tr>
Anthony Barbier8140e1e2017-12-14 23:48:46 +0000[diff] [blame]122<tr class="memdesc:a5dba6d401b54fd02d20a2ba246668d93"><td class="mdescLeft">&#160;</td><td class="mdescRight">Performs a perspective transform on an image interpolating with the BILINEAR method. <a href="#a5dba6d401b54fd02d20a2ba246668d93">More...</a><br /></td></tr>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]123<tr class="separator:a5dba6d401b54fd02d20a2ba246668d93"><td class="memSeparator" colspan="2">&#160;</td></tr>
124</table>
125<h2 class="groupheader">Function Documentation</h2>
Jenkinsb9abeae2018-11-22 11:58:08 +0000[diff] [blame]126<a id="a2791d623c1dbcf7e7111b8ff1b7daeeb"></a>
127<h2 class="memtitle"><span class="permalink"><a href="#a2791d623c1dbcf7e7111b8ff1b7daeeb">&#9670;&nbsp;</a></span>apply_perspective_transform()</h2>
128
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]129<div class="memitem">
130<div class="memproto">
131<table class="mlabels">
132 <tr>
133 <td class="mlabels-left">
134 <table class="memname">
135 <tr>
136 <td class="memname">const float8 apply_perspective_transform </td>
137 <td>(</td>
138 <td class="paramtype">const float2&#160;</td>
139 <td class="paramname"><em>coord</em>, </td>
140 </tr>
141 <tr>
142 <td class="paramkey"></td>
143 <td></td>
144 <td class="paramtype">const float16&#160;</td>
145 <td class="paramname"><em>mtx</em>&#160;</td>
146 </tr>
147 <tr>
148 <td></td>
149 <td>)</td>
150 <td></td><td></td>
151 </tr>
152 </table>
153 </td>
154 <td class="mlabels-right">
155<span class="mlabels"><span class="mlabel">inline</span></span> </td>
156 </tr>
157</table>
158</div><div class="memdoc">
159
160<p>Transforms four 2D coordinates using the formula: </p>
161<p>x0 = M[1][1] * x + M[1][2] * y + M[1][3] y0 = M[2][1] * x + M[2][2] * y + M[2][3] z0 = M[3][1] * x + M[3][2] * y + M[3][3]</p>
162<p>(x0/z0,y0/z0)</p>
163<dl class="params"><dt>Parameters</dt><dd>
164 <table class="params">
165 <tr><td class="paramdir">[in]</td><td class="paramname">coord</td><td>2D coordinate to transform. </td></tr>
166 <tr><td class="paramdir">[in]</td><td class="paramname">mtx</td><td>perspective matrix</td></tr>
167 </table>
168 </dd>
169</dl>
170<dl class="section return"><dt>Returns</dt><dd>a vector float8 containing four 2D transformed values. </dd></dl>
171
Jenkinsb9abeae2018-11-22 11:58:08 +0000[diff] [blame]172<p class="definition">Definition at line <a class="el" href="warp__perspective_8cl_source.xhtml#l00046">46</a> of file <a class="el" href="warp__perspective_8cl_source.xhtml">warp_perspective.cl</a>.</p>
Anthony Barbierf45d5a92018-01-24 16:23:15 +0000[diff] [blame]173<div class="fragment"><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;{</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="keyword">const</span> float4 in_x_coords = (float4)(coord.s0, 1 + coord.s0, 2 + coord.s0, 3 + coord.s0);</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="comment">// transform [z,z+1,z+2,z+3]</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="keyword">const</span> float4 z = (float4)mad(in_x_coords, (float4)(mtx.s2), mad((float4)(coord.s1), (float4)(mtx.s5), (float4)(mtx.s8)));</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="comment">// NOTE: Do not multiply x&amp;y by 1.f/Z as this will result in loss of accuracy and mismatches with VX reference implementation</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="comment">// transform [x,x+1,x+2,x+3]</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keyword">const</span> float4 new_x = (float4)mad(in_x_coords, (float4)(mtx.s0), mad((float4)(coord.s1), (float4)(mtx.s3), (float4)(mtx.s6))) / z;</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <span class="comment">// transform [y,y+1,y+2,y+3]</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keyword">const</span> float4 new_y = (float4)mad(in_x_coords, (float4)(mtx.s1), mad((float4)(coord.s1), (float4)(mtx.s4), (float4)(mtx.s7))) / z;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="keywordflow">return</span> (float8)(new_x.s0, new_y.s0, new_x.s1, new_y.s1, new_x.s2, new_y.s2, new_x.s3, new_y.s3);</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;}</div></div><!-- fragment -->
Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]174<p class="reference">Referenced by <a class="el" href="warp__perspective_8cl_source.xhtml#l00119">warp_perspective_bilinear()</a>, and <a class="el" href="warp__perspective_8cl_source.xhtml#l00087">warp_perspective_nearest_neighbour()</a>.</p>
175
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]176</div>
177</div>
Jenkinsb9abeae2018-11-22 11:58:08 +0000[diff] [blame]178<a id="aa02a47b9dfa96a2705d5c77044a40048"></a>
179<h2 class="memtitle"><span class="permalink"><a href="#aa02a47b9dfa96a2705d5c77044a40048">&#9670;&nbsp;</a></span>build_perspective_mtx()</h2>
180
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]181<div class="memitem">
182<div class="memproto">
183<table class="mlabels">
184 <tr>
185 <td class="mlabels-left">
186 <table class="memname">
187 <tr>
188 <td class="memname">const float16 build_perspective_mtx </td>
189 <td>(</td>
190 <td class="paramname"></td><td>)</td>
191 <td></td>
192 </tr>
193 </table>
194 </td>
195 <td class="mlabels-right">
196<span class="mlabels"><span class="mlabel">inline</span></span> </td>
197 </tr>
198</table>
199</div><div class="memdoc">
200
201<p>Returns the perspective matrix. </p>
202
Jenkinsb9abeae2018-11-22 11:58:08 +0000[diff] [blame]203<p class="definition">Definition at line <a class="el" href="warp__perspective_8cl_source.xhtml#l00028">28</a> of file <a class="el" href="warp__perspective_8cl_source.xhtml">warp_perspective.cl</a>.</p>
Anthony Barbier8140e1e2017-12-14 23:48:46 +0000[diff] [blame]204<div class="fragment"><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;{</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; <span class="keywordflow">return</span> (float16)(MAT0, MAT1, MAT2, MAT3, MAT4, MAT5, MAT6, MAT7, MAT8, 0, 0, 0, (float4)0);</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;}</div></div><!-- fragment -->
Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]205<p class="reference">Referenced by <a class="el" href="warp__perspective_8cl_source.xhtml#l00119">warp_perspective_bilinear()</a>, and <a class="el" href="warp__perspective_8cl_source.xhtml#l00087">warp_perspective_nearest_neighbour()</a>.</p>
206
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]207</div>
208</div>
Jenkinsb9abeae2018-11-22 11:58:08 +0000[diff] [blame]209<a id="a5dba6d401b54fd02d20a2ba246668d93"></a>
210<h2 class="memtitle"><span class="permalink"><a href="#a5dba6d401b54fd02d20a2ba246668d93">&#9670;&nbsp;</a></span>warp_perspective_bilinear()</h2>
211
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]212<div class="memitem">
213<div class="memproto">
214 <table class="memname">
215 <tr>
216 <td class="memname">__kernel void warp_perspective_bilinear </td>
217 <td>(</td>
218 <td class="paramtype">__global uchar *&#160;</td>
219 <td class="paramname"><em>in_ptr</em>, </td>
220 </tr>
221 <tr>
222 <td class="paramkey"></td>
223 <td></td>
224 <td class="paramtype">uint&#160;</td>
225 <td class="paramname"><em>in_stride_x</em>, </td>
226 </tr>
227 <tr>
228 <td class="paramkey"></td>
229 <td></td>
230 <td class="paramtype">uint&#160;</td>
231 <td class="paramname"><em>in_step_x</em>, </td>
232 </tr>
233 <tr>
234 <td class="paramkey"></td>
235 <td></td>
236 <td class="paramtype">uint&#160;</td>
237 <td class="paramname"><em>in_stride_y</em>, </td>
238 </tr>
239 <tr>
240 <td class="paramkey"></td>
241 <td></td>
242 <td class="paramtype">uint&#160;</td>
243 <td class="paramname"><em>in_step_y</em>, </td>
244 </tr>
245 <tr>
246 <td class="paramkey"></td>
247 <td></td>
248 <td class="paramtype">uint&#160;</td>
249 <td class="paramname"><em>in_offset_first_element_in_bytes</em>, </td>
250 </tr>
251 <tr>
252 <td class="paramkey"></td>
253 <td></td>
254 <td class="paramtype">__global uchar *&#160;</td>
255 <td class="paramname"><em>out_ptr</em>, </td>
256 </tr>
257 <tr>
258 <td class="paramkey"></td>
259 <td></td>
260 <td class="paramtype">uint&#160;</td>
261 <td class="paramname"><em>out_stride_x</em>, </td>
262 </tr>
263 <tr>
264 <td class="paramkey"></td>
265 <td></td>
266 <td class="paramtype">uint&#160;</td>
267 <td class="paramname"><em>out_step_x</em>, </td>
268 </tr>
269 <tr>
270 <td class="paramkey"></td>
271 <td></td>
272 <td class="paramtype">uint&#160;</td>
273 <td class="paramname"><em>out_stride_y</em>, </td>
274 </tr>
275 <tr>
276 <td class="paramkey"></td>
277 <td></td>
278 <td class="paramtype">uint&#160;</td>
279 <td class="paramname"><em>out_step_y</em>, </td>
280 </tr>
281 <tr>
282 <td class="paramkey"></td>
283 <td></td>
284 <td class="paramtype">uint&#160;</td>
285 <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td>
286 </tr>
287 <tr>
288 <td class="paramkey"></td>
289 <td></td>
290 <td class="paramtype">const int&#160;</td>
291 <td class="paramname"><em>width</em>, </td>
292 </tr>
293 <tr>
294 <td class="paramkey"></td>
295 <td></td>
296 <td class="paramtype">const int&#160;</td>
297 <td class="paramname"><em>height</em>&#160;</td>
298 </tr>
299 <tr>
300 <td></td>
301 <td>)</td>
302 <td></td><td></td>
303 </tr>
304 </table>
305</div><div class="memdoc">
306
307<p>Performs a perspective transform on an image interpolating with the BILINEAR method. </p>
308<p>Input and output are single channel U8.</p>
Anthony Barbier8140e1e2017-12-14 23:48:46 +0000[diff] [blame]309<dl class="section attention"><dt>Attention</dt><dd>The matrix coefficients need to be passed at compile time:<br />
310const char build_options [] = "-DMAT0=1 -DMAT1=2 -DMAT2=3 -DMAT3=4 -DMAT4=5 -DMAT5=6 -DMAT6=7 -DMAT7=8 -DMAT8=9"<br />
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]311clBuildProgram( program, 0, NULL, build_options, NULL, NULL);</dd></dl>
312<dl class="params"><dt>Parameters</dt><dd>
313 <table class="params">
314 <tr><td class="paramdir">[in]</td><td class="paramname">in_ptr</td><td>Pointer to the source image. Supported data types: U8. </td></tr>
315 <tr><td class="paramdir">[in]</td><td class="paramname">in_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
316 <tr><td class="paramdir">[in]</td><td class="paramname">in_step_x</td><td>in_stride_x * number of elements along X processed per work item (in bytes) </td></tr>
317 <tr><td class="paramdir">[in]</td><td class="paramname">in_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
318 <tr><td class="paramdir">[in]</td><td class="paramname">in_step_y</td><td>in_stride_y * number of elements along Y processed per work item (in bytes) </td></tr>
319 <tr><td class="paramdir">[in]</td><td class="paramname">in_offset_first_element_in_bytes</td><td>Offset of the first element in the source image </td></tr>
320 <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the destination image. Supported data types: U8. </td></tr>
321 <tr><td class="paramdir">[in]</td><td class="paramname">out_stride_x</td><td>Stride of the destination image in X dimension (in bytes) </td></tr>
322 <tr><td class="paramdir">[in]</td><td class="paramname">out_step_x</td><td>out_stride_x * number of elements along X processed per work item (in bytes) </td></tr>
323 <tr><td class="paramdir">[in]</td><td class="paramname">out_stride_y</td><td>Stride of the destination image in Y dimension (in bytes) </td></tr>
324 <tr><td class="paramdir">[in]</td><td class="paramname">out_step_y</td><td>out_stride_y * number of elements along Y processed per work item (in bytes) </td></tr>
325 <tr><td class="paramdir">[in]</td><td class="paramname">out_offset_first_element_in_bytes</td><td>Offset of the first element in the destination image </td></tr>
326 <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the destination image </td></tr>
327 <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the destination image </td></tr>
328 </table>
329 </dd>
330</dl>
331
Jenkinsb9abeae2018-11-22 11:58:08 +0000[diff] [blame]332<p class="definition">Definition at line <a class="el" href="warp__perspective_8cl_source.xhtml#l00119">119</a> of file <a class="el" href="warp__perspective_8cl_source.xhtml">warp_perspective.cl</a>.</p>
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]333<div class="fragment"><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;{</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; <a class="code" href="struct_image.xhtml">Image</a> in = <a class="code" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(in);</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; <a class="code" href="struct_image.xhtml">Image</a> out = <a class="code" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(out);</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; vstore4(<a class="code" href="warp__helpers_8h.xhtml#abea9f226daf3e0ad741d03cf7417d353">bilinear_interpolate</a>(&amp;in, <a class="code" href="warp__perspective_8cl.xhtml#a2791d623c1dbcf7e7111b8ff1b7daeeb">apply_perspective_transform</a>(<a class="code" href="warp__helpers_8h.xhtml#a4caaeeb51ea58015267a9974675226d1">get_current_coords</a>(), <a class="code" href="warp__perspective_8cl.xhtml#aa02a47b9dfa96a2705d5c77044a40048">build_perspective_mtx</a>()), width, height), 0, out.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;}</div><div class="ttc" id="src_2core_2_c_l_2cl__kernels_2_helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT(name)</div><div class="ttdef"><b>Definition:</b> <a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00311">helpers.h:311</a></div></div>
Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]334<div class="ttc" id="warp__perspective_8cl_xhtml_a2791d623c1dbcf7e7111b8ff1b7daeeb"><div class="ttname"><a href="warp__perspective_8cl.xhtml#a2791d623c1dbcf7e7111b8ff1b7daeeb">apply_perspective_transform</a></div><div class="ttdeci">const float8 apply_perspective_transform(const float2 coord, const float16 mtx)</div><div class="ttdoc">Transforms four 2D coordinates using the formula:</div><div class="ttdef"><b>Definition:</b> <a href="warp__perspective_8cl_source.xhtml#l00046">warp_perspective.cl:46</a></div></div>
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]335<div class="ttc" id="src_2core_2_c_l_2cl__kernels_2_helpers_8h_xhtml_a4334a4a76f8e9628c0fb9e1acf616e2a"><div class="ttname"><a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT_NO_STEP(name)</div><div class="ttdef"><b>Definition:</b> <a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00314">helpers.h:314</a></div></div>
Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]336<div class="ttc" id="warp__perspective_8cl_xhtml_aa02a47b9dfa96a2705d5c77044a40048"><div class="ttname"><a href="warp__perspective_8cl.xhtml#aa02a47b9dfa96a2705d5c77044a40048">build_perspective_mtx</a></div><div class="ttdeci">const float16 build_perspective_mtx()</div><div class="ttdoc">Returns the perspective matrix.</div><div class="ttdef"><b>Definition:</b> <a href="warp__perspective_8cl_source.xhtml#l00028">warp_perspective.cl:28</a></div></div>
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]337<div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information.</div><div class="ttdef"><b>Definition:</b> <a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00349">helpers.h:349</a></div></div>
338<div class="ttc" id="struct_image_xhtml_acf52c23cbd7424606c10a606524e3e32"><div class="ttname"><a href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">Image::ptr</a></div><div class="ttdeci">__global uchar * ptr</div><div class="ttdoc">Pointer to the starting postion of the buffer.</div><div class="ttdef"><b>Definition:</b> <a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00351">helpers.h:351</a></div></div>
Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]339<div class="ttc" id="warp__helpers_8h_xhtml_a4caaeeb51ea58015267a9974675226d1"><div class="ttname"><a href="warp__helpers_8h.xhtml#a4caaeeb51ea58015267a9974675226d1">get_current_coords</a></div><div class="ttdeci">const float2 get_current_coords()</div><div class="ttdoc">Returns the current thread coordinates.</div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00068">warp_helpers.h:68</a></div></div>
Jenkinsb9abeae2018-11-22 11:58:08 +0000[diff] [blame]340<div class="ttc" id="warp__helpers_8h_xhtml_abea9f226daf3e0ad741d03cf7417d353"><div class="ttname"><a href="warp__helpers_8h.xhtml#abea9f226daf3e0ad741d03cf7417d353">bilinear_interpolate</a></div><div class="ttdeci">const DATA_TYPE4 bilinear_interpolate(const Image *in, const float8 coords, const float width, const float height)</div><div class="ttdoc">Computes the bilinear interpolation for each set of coordinates in the vector coords and returns the ...</div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00137">warp_helpers.h:137</a></div></div>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]341</div><!-- fragment -->
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]342<p class="reference">References <a class="el" href="warp__perspective_8cl_source.xhtml#l00046">apply_perspective_transform()</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00137">bilinear_interpolate()</a>, <a class="el" href="warp__perspective_8cl_source.xhtml#l00028">build_perspective_mtx()</a>, <a class="el" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00311">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00314">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00068">get_current_coords()</a>, and <a class="el" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00351">Image::ptr</a>.</p>
Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]343
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]344</div>
345</div>
Jenkinsb9abeae2018-11-22 11:58:08 +0000[diff] [blame]346<a id="ab8f5d79d7699ec7e2a805a25ca0fca2b"></a>
347<h2 class="memtitle"><span class="permalink"><a href="#ab8f5d79d7699ec7e2a805a25ca0fca2b">&#9670;&nbsp;</a></span>warp_perspective_nearest_neighbour()</h2>
348
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]349<div class="memitem">
350<div class="memproto">
351 <table class="memname">
352 <tr>
353 <td class="memname">__kernel void warp_perspective_nearest_neighbour </td>
354 <td>(</td>
355 <td class="paramtype">__global uchar *&#160;</td>
356 <td class="paramname"><em>in_ptr</em>, </td>
357 </tr>
358 <tr>
359 <td class="paramkey"></td>
360 <td></td>
361 <td class="paramtype">uint&#160;</td>
362 <td class="paramname"><em>in_stride_x</em>, </td>
363 </tr>
364 <tr>
365 <td class="paramkey"></td>
366 <td></td>
367 <td class="paramtype">uint&#160;</td>
368 <td class="paramname"><em>in_step_x</em>, </td>
369 </tr>
370 <tr>
371 <td class="paramkey"></td>
372 <td></td>
373 <td class="paramtype">uint&#160;</td>
374 <td class="paramname"><em>in_stride_y</em>, </td>
375 </tr>
376 <tr>
377 <td class="paramkey"></td>
378 <td></td>
379 <td class="paramtype">uint&#160;</td>
380 <td class="paramname"><em>in_step_y</em>, </td>
381 </tr>
382 <tr>
383 <td class="paramkey"></td>
384 <td></td>
385 <td class="paramtype">uint&#160;</td>
386 <td class="paramname"><em>in_offset_first_element_in_bytes</em>, </td>
387 </tr>
388 <tr>
389 <td class="paramkey"></td>
390 <td></td>
391 <td class="paramtype">__global uchar *&#160;</td>
392 <td class="paramname"><em>out_ptr</em>, </td>
393 </tr>
394 <tr>
395 <td class="paramkey"></td>
396 <td></td>
397 <td class="paramtype">uint&#160;</td>
398 <td class="paramname"><em>out_stride_x</em>, </td>
399 </tr>
400 <tr>
401 <td class="paramkey"></td>
402 <td></td>
403 <td class="paramtype">uint&#160;</td>
404 <td class="paramname"><em>out_step_x</em>, </td>
405 </tr>
406 <tr>
407 <td class="paramkey"></td>
408 <td></td>
409 <td class="paramtype">uint&#160;</td>
410 <td class="paramname"><em>out_stride_y</em>, </td>
411 </tr>
412 <tr>
413 <td class="paramkey"></td>
414 <td></td>
415 <td class="paramtype">uint&#160;</td>
416 <td class="paramname"><em>out_step_y</em>, </td>
417 </tr>
418 <tr>
419 <td class="paramkey"></td>
420 <td></td>
421 <td class="paramtype">uint&#160;</td>
422 <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td>
423 </tr>
424 <tr>
425 <td class="paramkey"></td>
426 <td></td>
427 <td class="paramtype">const int&#160;</td>
428 <td class="paramname"><em>width</em>, </td>
429 </tr>
430 <tr>
431 <td class="paramkey"></td>
432 <td></td>
433 <td class="paramtype">const int&#160;</td>
434 <td class="paramname"><em>height</em>&#160;</td>
435 </tr>
436 <tr>
437 <td></td>
438 <td>)</td>
439 <td></td><td></td>
440 </tr>
441 </table>
442</div><div class="memdoc">
443
444<p>Performs perspective transformation on an image interpolating with the NEAREAST NEIGHBOUR method. </p>
445<p>Input and output are single channel U8.</p>
446<p>This kernel performs perspective transform with a 3x3 Matrix M with this method of pixel coordinate translation: x0 = M[1][1] * x + M[1][2] * y + M[1][3] y0 = M[2][1] * x + M[2][2] * y + M[2][3] z0 = M[3][1] * x + M[3][2] * y + M[3][3]</p>
447<p>output(x,y) = input(x0/z0,y0/z0)</p>
Anthony Barbier8140e1e2017-12-14 23:48:46 +0000[diff] [blame]448<dl class="section attention"><dt>Attention</dt><dd>The matrix coefficients need to be passed at compile time:<br />
449const char build_options [] = "-DMAT0=1 -DMAT1=2 -DMAT2=3 -DMAT3=4 -DMAT4=5 -DMAT5=6 -DMAT6=7 -DMAT7=8 -DMAT8=9"<br />
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]450clBuildProgram( program, 0, NULL, build_options, NULL, NULL);</dd></dl>
451<dl class="params"><dt>Parameters</dt><dd>
452 <table class="params">
453 <tr><td class="paramdir">[in]</td><td class="paramname">in_ptr</td><td>Pointer to the source image. Supported data types: U8. </td></tr>
454 <tr><td class="paramdir">[in]</td><td class="paramname">in_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
455 <tr><td class="paramdir">[in]</td><td class="paramname">in_step_x</td><td>in_stride_x * number of elements along X processed per work item (in bytes) </td></tr>
456 <tr><td class="paramdir">[in]</td><td class="paramname">in_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
457 <tr><td class="paramdir">[in]</td><td class="paramname">in_step_y</td><td>in_stride_y * number of elements along Y processed per work item (in bytes) </td></tr>
458 <tr><td class="paramdir">[in]</td><td class="paramname">in_offset_first_element_in_bytes</td><td>Offset of the first element in the source image </td></tr>
459 <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the destination image. Supported data types: U8. </td></tr>
460 <tr><td class="paramdir">[in]</td><td class="paramname">out_stride_x</td><td>Stride of the destination image in X dimension (in bytes) </td></tr>
461 <tr><td class="paramdir">[in]</td><td class="paramname">out_step_x</td><td>out_stride_x * number of elements along X processed per work item (in bytes) </td></tr>
462 <tr><td class="paramdir">[in]</td><td class="paramname">out_stride_y</td><td>Stride of the destination image in Y dimension (in bytes) </td></tr>
463 <tr><td class="paramdir">[in]</td><td class="paramname">out_step_y</td><td>out_stride_y * number of elements along Y processed per work item (in bytes) </td></tr>
464 <tr><td class="paramdir">[in]</td><td class="paramname">out_offset_first_element_in_bytes</td><td>Offset of the first element in the destination image </td></tr>
465 <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the destination image </td></tr>
466 <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the destination image </td></tr>
467 </table>
468 </dd>
469</dl>
470
Jenkinsb9abeae2018-11-22 11:58:08 +0000[diff] [blame]471<p class="definition">Definition at line <a class="el" href="warp__perspective_8cl_source.xhtml#l00087">87</a> of file <a class="el" href="warp__perspective_8cl_source.xhtml">warp_perspective.cl</a>.</p>
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]472<div class="fragment"><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;{</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <a class="code" href="struct_image.xhtml">Image</a> in = <a class="code" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(in);</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <a class="code" href="struct_image.xhtml">Image</a> out = <a class="code" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(out);</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; vstore4(<a class="code" href="warp__helpers_8h.xhtml#aba42442a4c991cdbb52727fa370676f1">read_texels4</a>(&amp;in, convert_int8_rtn(<a class="code" href="warp__helpers_8h.xhtml#adbdf2ca9e8fe0b67f9359929ef743126">clamp_to_border</a>(<a class="code" href="warp__perspective_8cl.xhtml#a2791d623c1dbcf7e7111b8ff1b7daeeb">apply_perspective_transform</a>(<a class="code" href="warp__helpers_8h.xhtml#a4caaeeb51ea58015267a9974675226d1">get_current_coords</a>(), <a class="code" href="warp__perspective_8cl.xhtml#aa02a47b9dfa96a2705d5c77044a40048">build_perspective_mtx</a>()), width, height))), 0, out.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;}</div><div class="ttc" id="src_2core_2_c_l_2cl__kernels_2_helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT(name)</div><div class="ttdef"><b>Definition:</b> <a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00311">helpers.h:311</a></div></div>
Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]473<div class="ttc" id="warp__helpers_8h_xhtml_adbdf2ca9e8fe0b67f9359929ef743126"><div class="ttname"><a href="warp__helpers_8h.xhtml#adbdf2ca9e8fe0b67f9359929ef743126">clamp_to_border</a></div><div class="ttdeci">const float8 clamp_to_border(float8 coords, const float width, const float height)</div><div class="ttdoc">Clamps the given coordinates to the borders.</div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00049">warp_helpers.h:49</a></div></div>
474<div class="ttc" id="warp__perspective_8cl_xhtml_a2791d623c1dbcf7e7111b8ff1b7daeeb"><div class="ttname"><a href="warp__perspective_8cl.xhtml#a2791d623c1dbcf7e7111b8ff1b7daeeb">apply_perspective_transform</a></div><div class="ttdeci">const float8 apply_perspective_transform(const float2 coord, const float16 mtx)</div><div class="ttdoc">Transforms four 2D coordinates using the formula:</div><div class="ttdef"><b>Definition:</b> <a href="warp__perspective_8cl_source.xhtml#l00046">warp_perspective.cl:46</a></div></div>
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]475<div class="ttc" id="src_2core_2_c_l_2cl__kernels_2_helpers_8h_xhtml_a4334a4a76f8e9628c0fb9e1acf616e2a"><div class="ttname"><a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT_NO_STEP(name)</div><div class="ttdef"><b>Definition:</b> <a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00314">helpers.h:314</a></div></div>
Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]476<div class="ttc" id="warp__perspective_8cl_xhtml_aa02a47b9dfa96a2705d5c77044a40048"><div class="ttname"><a href="warp__perspective_8cl.xhtml#aa02a47b9dfa96a2705d5c77044a40048">build_perspective_mtx</a></div><div class="ttdeci">const float16 build_perspective_mtx()</div><div class="ttdoc">Returns the perspective matrix.</div><div class="ttdef"><b>Definition:</b> <a href="warp__perspective_8cl_source.xhtml#l00028">warp_perspective.cl:28</a></div></div>
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]477<div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information.</div><div class="ttdef"><b>Definition:</b> <a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00349">helpers.h:349</a></div></div>
478<div class="ttc" id="struct_image_xhtml_acf52c23cbd7424606c10a606524e3e32"><div class="ttname"><a href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">Image::ptr</a></div><div class="ttdeci">__global uchar * ptr</div><div class="ttdoc">Pointer to the starting postion of the buffer.</div><div class="ttdef"><b>Definition:</b> <a href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00351">helpers.h:351</a></div></div>
Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]479<div class="ttc" id="warp__helpers_8h_xhtml_aba42442a4c991cdbb52727fa370676f1"><div class="ttname"><a href="warp__helpers_8h.xhtml#aba42442a4c991cdbb52727fa370676f1">read_texels4</a></div><div class="ttdeci">const DATA_TYPE4 read_texels4(const Image *in, const int8 coords)</div><div class="ttdoc">Reads four texels from the input image.</div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00059">warp_helpers.h:59</a></div></div>
480<div class="ttc" id="warp__helpers_8h_xhtml_a4caaeeb51ea58015267a9974675226d1"><div class="ttname"><a href="warp__helpers_8h.xhtml#a4caaeeb51ea58015267a9974675226d1">get_current_coords</a></div><div class="ttdeci">const float2 get_current_coords()</div><div class="ttdoc">Returns the current thread coordinates.</div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00068">warp_helpers.h:68</a></div></div>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]481</div><!-- fragment -->
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]482<p class="reference">References <a class="el" href="warp__perspective_8cl_source.xhtml#l00046">apply_perspective_transform()</a>, <a class="el" href="warp__perspective_8cl_source.xhtml#l00028">build_perspective_mtx()</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00049">clamp_to_border()</a>, <a class="el" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00311">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00314">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00068">get_current_coords()</a>, <a class="el" href="src_2core_2_c_l_2cl__kernels_2_helpers_8h_source.xhtml#l00351">Image::ptr</a>, and <a class="el" href="warp__helpers_8h_source.xhtml#l00059">read_texels4()</a>.</p>
Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]483
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]484</div>
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Anthony Barbier8140e1e2017-12-14 23:48:46 +0000[diff] [blame]491 <li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.xhtml">src</a></li><li class="navelem"><a class="el" href="dir_aebb8dcc11953d78e620bbef0b9e2183.xhtml">core</a></li><li class="navelem"><a class="el" href="dir_8c278f79c760e5c5fbd911f9870614c1.xhtml">CL</a></li><li class="navelem"><a class="el" href="dir_25885286e9dad4fa105b7b25a8031bbf.xhtml">cl_kernels</a></li><li class="navelem"><a class="el" href="warp__perspective_8cl.xhtml">warp_perspective.cl</a></li>
Jenkins0e205f72019-11-28 16:53:35 +0000[diff] [blame^]492 <li class="footer">Generated on Thu Nov 28 2019 16:53:07 for Compute Library by
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Jenkins514be652019-02-28 12:25:18 +0000[diff] [blame]494 <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.15 </li>
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