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gerrit-public.fairphone.software / platform / external / ComputeLibrary / 8a3da6f91f90c566b844d568f4ec43b946915af8 / . / documentation / warp__perspective_8cl.xhtml
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117<div class="title">warp_perspective.cl File Reference</div> </div>
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119<div class="contents">
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]120<div class="textblock"><code>#include &quot;<a class="el" href="helpers_8h_source.xhtml">helpers.h</a>&quot;</code><br/>
121<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]122</div>
123<p><a href="warp__perspective_8cl_source.xhtml">Go to the source code of this file.</a></p>
124<table class="memberdecls">
125<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
126Functions</h2></td></tr>
127<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>
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]128<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]129<tr class="separator:aa02a47b9dfa96a2705d5c77044a40048"><td class="memSeparator" colspan="2">&#160;</td></tr>
130<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>
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]131<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]132<tr class="separator:a2791d623c1dbcf7e7111b8ff1b7daeeb"><td class="memSeparator" colspan="2">&#160;</td></tr>
133<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>
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]134<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]135<tr class="separator:ab8f5d79d7699ec7e2a805a25ca0fca2b"><td class="memSeparator" colspan="2">&#160;</td></tr>
136<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>
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]137<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]138<tr class="separator:a5dba6d401b54fd02d20a2ba246668d93"><td class="memSeparator" colspan="2">&#160;</td></tr>
139</table>
140<h2 class="groupheader">Function Documentation</h2>
141<a class="anchor" id="a2791d623c1dbcf7e7111b8ff1b7daeeb"></a>
142<div class="memitem">
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144<table class="mlabels">
145 <tr>
146 <td class="mlabels-left">
147 <table class="memname">
148 <tr>
149 <td class="memname">const float8 apply_perspective_transform </td>
150 <td>(</td>
151 <td class="paramtype">const float2&#160;</td>
152 <td class="paramname"><em>coord</em>, </td>
153 </tr>
154 <tr>
155 <td class="paramkey"></td>
156 <td></td>
157 <td class="paramtype">const float16&#160;</td>
158 <td class="paramname"><em>mtx</em>&#160;</td>
159 </tr>
160 <tr>
161 <td></td>
162 <td>)</td>
163 <td></td><td></td>
164 </tr>
165 </table>
166 </td>
167 <td class="mlabels-right">
168<span class="mlabels"><span class="mlabel">inline</span></span> </td>
169 </tr>
170</table>
171</div><div class="memdoc">
172
173<p>Transforms four 2D coordinates using the formula: </p>
174<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>
175<p>(x0/z0,y0/z0)</p>
176<dl class="params"><dt>Parameters</dt><dd>
177 <table class="params">
178 <tr><td class="paramdir">[in]</td><td class="paramname">coord</td><td>2D coordinate to transform. </td></tr>
179 <tr><td class="paramdir">[in]</td><td class="paramname">mtx</td><td>perspective matrix</td></tr>
180 </table>
181 </dd>
182</dl>
183<dl class="section return"><dt>Returns</dt><dd>a vector float8 containing four 2D transformed values. </dd></dl>
184
185<p>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>
186
187<p>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>
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]188<div class="fragment"><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;{</div>
189<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>
190<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>
191<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>
192<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>
193<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>
194<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>
195<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>
196<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>
197<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>
198<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;}</div>
199</div><!-- fragment -->
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]200</div>
201</div>
202<a class="anchor" id="aa02a47b9dfa96a2705d5c77044a40048"></a>
203<div class="memitem">
204<div class="memproto">
205<table class="mlabels">
206 <tr>
207 <td class="mlabels-left">
208 <table class="memname">
209 <tr>
210 <td class="memname">const float16 build_perspective_mtx </td>
211 <td>(</td>
212 <td class="paramname"></td><td>)</td>
213 <td></td>
214 </tr>
215 </table>
216 </td>
217 <td class="mlabels-right">
218<span class="mlabels"><span class="mlabel">inline</span></span> </td>
219 </tr>
220</table>
221</div><div class="memdoc">
222
223<p>Returns the perspective matrix. </p>
224
225<p>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>
226
227<p>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>
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]228<div class="fragment"><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;{</div>
229<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>
230<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;}</div>
231</div><!-- fragment -->
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]232</div>
233</div>
234<a class="anchor" id="a5dba6d401b54fd02d20a2ba246668d93"></a>
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238 <tr>
239 <td class="memname">__kernel void warp_perspective_bilinear </td>
240 <td>(</td>
241 <td class="paramtype">__global uchar *&#160;</td>
242 <td class="paramname"><em>in_ptr</em>, </td>
243 </tr>
244 <tr>
245 <td class="paramkey"></td>
246 <td></td>
247 <td class="paramtype">uint&#160;</td>
248 <td class="paramname"><em>in_stride_x</em>, </td>
249 </tr>
250 <tr>
251 <td class="paramkey"></td>
252 <td></td>
253 <td class="paramtype">uint&#160;</td>
254 <td class="paramname"><em>in_step_x</em>, </td>
255 </tr>
256 <tr>
257 <td class="paramkey"></td>
258 <td></td>
259 <td class="paramtype">uint&#160;</td>
260 <td class="paramname"><em>in_stride_y</em>, </td>
261 </tr>
262 <tr>
263 <td class="paramkey"></td>
264 <td></td>
265 <td class="paramtype">uint&#160;</td>
266 <td class="paramname"><em>in_step_y</em>, </td>
267 </tr>
268 <tr>
269 <td class="paramkey"></td>
270 <td></td>
271 <td class="paramtype">uint&#160;</td>
272 <td class="paramname"><em>in_offset_first_element_in_bytes</em>, </td>
273 </tr>
274 <tr>
275 <td class="paramkey"></td>
276 <td></td>
277 <td class="paramtype">__global uchar *&#160;</td>
278 <td class="paramname"><em>out_ptr</em>, </td>
279 </tr>
280 <tr>
281 <td class="paramkey"></td>
282 <td></td>
283 <td class="paramtype">uint&#160;</td>
284 <td class="paramname"><em>out_stride_x</em>, </td>
285 </tr>
286 <tr>
287 <td class="paramkey"></td>
288 <td></td>
289 <td class="paramtype">uint&#160;</td>
290 <td class="paramname"><em>out_step_x</em>, </td>
291 </tr>
292 <tr>
293 <td class="paramkey"></td>
294 <td></td>
295 <td class="paramtype">uint&#160;</td>
296 <td class="paramname"><em>out_stride_y</em>, </td>
297 </tr>
298 <tr>
299 <td class="paramkey"></td>
300 <td></td>
301 <td class="paramtype">uint&#160;</td>
302 <td class="paramname"><em>out_step_y</em>, </td>
303 </tr>
304 <tr>
305 <td class="paramkey"></td>
306 <td></td>
307 <td class="paramtype">uint&#160;</td>
308 <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td>
309 </tr>
310 <tr>
311 <td class="paramkey"></td>
312 <td></td>
313 <td class="paramtype">const int&#160;</td>
314 <td class="paramname"><em>width</em>, </td>
315 </tr>
316 <tr>
317 <td class="paramkey"></td>
318 <td></td>
319 <td class="paramtype">const int&#160;</td>
320 <td class="paramname"><em>height</em>&#160;</td>
321 </tr>
322 <tr>
323 <td></td>
324 <td>)</td>
325 <td></td><td></td>
326 </tr>
327 </table>
328</div><div class="memdoc">
329
330<p>Performs a perspective transform on an image interpolating with the BILINEAR method. </p>
331<p>Input and output are single channel U8.</p>
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]332<dl class="section attention"><dt>Attention</dt><dd>The matrix coefficients need to be passed at compile time:<br/>
333const 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]334clBuildProgram( program, 0, NULL, build_options, NULL, NULL);</dd></dl>
335<dl class="params"><dt>Parameters</dt><dd>
336 <table class="params">
337 <tr><td class="paramdir">[in]</td><td class="paramname">in_ptr</td><td>Pointer to the source image. Supported data types: U8. </td></tr>
338 <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>
339 <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>
340 <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>
341 <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>
342 <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>
343 <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the destination image. Supported data types: U8. </td></tr>
344 <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>
345 <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>
346 <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>
347 <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>
348 <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>
349 <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the destination image </td></tr>
350 <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the destination image </td></tr>
351 </table>
352 </dd>
353</dl>
354
355<p>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>
356
Kaizenbf8b01d2017-10-12 14:26:51 +0100[diff] [blame]357<p>References <a class="el" href="warp__perspective_8cl_source.xhtml#l00046">apply_perspective_transform()</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00080">bilinear_interpolate()</a>, <a class="el" href="warp__perspective_8cl_source.xhtml#l00028">build_perspective_mtx()</a>, <a class="el" href="helpers_8h_source.xhtml#l00096">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="helpers_8h_source.xhtml#l00099">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00054">get_current_coords()</a>, and <a class="el" href="helpers_8h_source.xhtml#l00136">Image::ptr</a>.</p>
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]358<div class="fragment"><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;{</div>
359<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="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(in);</div>
360<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="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(out);</div>
361<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>
362<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;}</div>
Kaizenbf8b01d2017-10-12 14:26:51 +0100[diff] [blame]363<div class="ttc" id="helpers_8h_xhtml_a4334a4a76f8e9628c0fb9e1acf616e2a"><div class="ttname"><a href="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="helpers_8h_source.xhtml#l00099">helpers.h:99</a></div></div>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]364<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>
Kaizenbf8b01d2017-10-12 14:26:51 +0100[diff] [blame]365<div class="ttc" id="helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="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="helpers_8h_source.xhtml#l00096">helpers.h:96</a></div></div>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]366<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>
Kaizenbf8b01d2017-10-12 14:26:51 +0100[diff] [blame]367<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="helpers_8h_source.xhtml#l00134">helpers.h:134</a></div></div>
368<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="helpers_8h_source.xhtml#l00136">helpers.h:136</a></div></div>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]369<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#l00054">warp_helpers.h:54</a></div></div>
370<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#l00080">warp_helpers.h:80</a></div></div>
371</div><!-- fragment -->
372</div>
373</div>
374<a class="anchor" id="ab8f5d79d7699ec7e2a805a25ca0fca2b"></a>
375<div class="memitem">
376<div class="memproto">
377 <table class="memname">
378 <tr>
379 <td class="memname">__kernel void warp_perspective_nearest_neighbour </td>
380 <td>(</td>
381 <td class="paramtype">__global uchar *&#160;</td>
382 <td class="paramname"><em>in_ptr</em>, </td>
383 </tr>
384 <tr>
385 <td class="paramkey"></td>
386 <td></td>
387 <td class="paramtype">uint&#160;</td>
388 <td class="paramname"><em>in_stride_x</em>, </td>
389 </tr>
390 <tr>
391 <td class="paramkey"></td>
392 <td></td>
393 <td class="paramtype">uint&#160;</td>
394 <td class="paramname"><em>in_step_x</em>, </td>
395 </tr>
396 <tr>
397 <td class="paramkey"></td>
398 <td></td>
399 <td class="paramtype">uint&#160;</td>
400 <td class="paramname"><em>in_stride_y</em>, </td>
401 </tr>
402 <tr>
403 <td class="paramkey"></td>
404 <td></td>
405 <td class="paramtype">uint&#160;</td>
406 <td class="paramname"><em>in_step_y</em>, </td>
407 </tr>
408 <tr>
409 <td class="paramkey"></td>
410 <td></td>
411 <td class="paramtype">uint&#160;</td>
412 <td class="paramname"><em>in_offset_first_element_in_bytes</em>, </td>
413 </tr>
414 <tr>
415 <td class="paramkey"></td>
416 <td></td>
417 <td class="paramtype">__global uchar *&#160;</td>
418 <td class="paramname"><em>out_ptr</em>, </td>
419 </tr>
420 <tr>
421 <td class="paramkey"></td>
422 <td></td>
423 <td class="paramtype">uint&#160;</td>
424 <td class="paramname"><em>out_stride_x</em>, </td>
425 </tr>
426 <tr>
427 <td class="paramkey"></td>
428 <td></td>
429 <td class="paramtype">uint&#160;</td>
430 <td class="paramname"><em>out_step_x</em>, </td>
431 </tr>
432 <tr>
433 <td class="paramkey"></td>
434 <td></td>
435 <td class="paramtype">uint&#160;</td>
436 <td class="paramname"><em>out_stride_y</em>, </td>
437 </tr>
438 <tr>
439 <td class="paramkey"></td>
440 <td></td>
441 <td class="paramtype">uint&#160;</td>
442 <td class="paramname"><em>out_step_y</em>, </td>
443 </tr>
444 <tr>
445 <td class="paramkey"></td>
446 <td></td>
447 <td class="paramtype">uint&#160;</td>
448 <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td>
449 </tr>
450 <tr>
451 <td class="paramkey"></td>
452 <td></td>
453 <td class="paramtype">const int&#160;</td>
454 <td class="paramname"><em>width</em>, </td>
455 </tr>
456 <tr>
457 <td class="paramkey"></td>
458 <td></td>
459 <td class="paramtype">const int&#160;</td>
460 <td class="paramname"><em>height</em>&#160;</td>
461 </tr>
462 <tr>
463 <td></td>
464 <td>)</td>
465 <td></td><td></td>
466 </tr>
467 </table>
468</div><div class="memdoc">
469
470<p>Performs perspective transformation on an image interpolating with the NEAREAST NEIGHBOUR method. </p>
471<p>Input and output are single channel U8.</p>
472<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>
473<p>output(x,y) = input(x0/z0,y0/z0)</p>
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]474<dl class="section attention"><dt>Attention</dt><dd>The matrix coefficients need to be passed at compile time:<br/>
475const 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]476clBuildProgram( program, 0, NULL, build_options, NULL, NULL);</dd></dl>
477<dl class="params"><dt>Parameters</dt><dd>
478 <table class="params">
479 <tr><td class="paramdir">[in]</td><td class="paramname">in_ptr</td><td>Pointer to the source image. Supported data types: U8. </td></tr>
480 <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>
481 <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>
482 <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>
483 <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>
484 <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>
485 <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the destination image. Supported data types: U8. </td></tr>
486 <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>
487 <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>
488 <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>
489 <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>
490 <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>
491 <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the destination image </td></tr>
492 <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the destination image </td></tr>
493 </table>
494 </dd>
495</dl>
496
497<p>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>
498
Kaizenbf8b01d2017-10-12 14:26:51 +0100[diff] [blame]499<p>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#l00033">clamp_to_border()</a>, <a class="el" href="helpers_8h_source.xhtml#l00096">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="helpers_8h_source.xhtml#l00099">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00054">get_current_coords()</a>, <a class="el" href="helpers_8h_source.xhtml#l00136">Image::ptr</a>, and <a class="el" href="warp__helpers_8h_source.xhtml#l00045">read_texels4()</a>.</p>
Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]500<div class="fragment"><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;{</div>
501<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="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(in);</div>
502<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="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(out);</div>
503<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>
504<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;}</div>
505<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#l00033">warp_helpers.h:33</a></div></div>
Kaizenbf8b01d2017-10-12 14:26:51 +0100[diff] [blame]506<div class="ttc" id="helpers_8h_xhtml_a4334a4a76f8e9628c0fb9e1acf616e2a"><div class="ttname"><a href="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="helpers_8h_source.xhtml#l00099">helpers.h:99</a></div></div>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]507<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>
Kaizenbf8b01d2017-10-12 14:26:51 +0100[diff] [blame]508<div class="ttc" id="helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="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="helpers_8h_source.xhtml#l00096">helpers.h:96</a></div></div>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]509<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>
Kaizenbf8b01d2017-10-12 14:26:51 +0100[diff] [blame]510<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="helpers_8h_source.xhtml#l00134">helpers.h:134</a></div></div>
511<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="helpers_8h_source.xhtml#l00136">helpers.h:136</a></div></div>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]512<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#l00045">warp_helpers.h:45</a></div></div>
513<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#l00054">warp_helpers.h:54</a></div></div>
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Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]522 <li class="navelem"><a class="el" href="dir_55b5a5006e943fb664ff8cff3cfe7768.xhtml">src</a></li><li class="navelem"><a class="el" href="dir_f6c3ae42d7e27145d0a3c3e38ca1c000.xhtml">core</a></li><li class="navelem"><a class="el" href="dir_1b7ae9123c88e650426d50d95c19d414.xhtml">CL</a></li><li class="navelem"><a class="el" href="dir_b7c3d80b0dadb2139bc73b7161751c12.xhtml">cl_kernels</a></li><li class="navelem"><a class="el" href="warp__perspective_8cl.xhtml">warp_perspective.cl</a></li>
Kaizenbf8b01d2017-10-12 14:26:51 +0100[diff] [blame]523 <li class="footer">Generated on Thu Oct 12 2017 14:26:35 for Compute Library by
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Kaizen8938bd32017-09-28 14:38:23 +0100[diff] [blame]525 <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.6 </li>
Anthony Barbier871448e2017-03-24 14:54:29 +0000[diff] [blame]526 </ul>
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