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| <div class="title">warp_perspective.cl File Reference</div> </div> |
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| <div class="textblock"><code>#include "<a class="el" href="helpers_8h_source.xhtml">helpers.h</a>"</code><br/> |
| <code>#include "<a class="el" href="warp__helpers_8h_source.xhtml">warp_helpers.h</a>"</code><br/> |
| </div> |
| <p><a href="warp__perspective_8cl_source.xhtml">Go to the source code of this file.</a></p> |
| <table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a> |
| Functions</h2></td></tr> |
| <tr class="memitem:aa02a47b9dfa96a2705d5c77044a40048"><td class="memItemLeft" align="right" valign="top">const float16 </td><td class="memItemRight" valign="bottom"><a class="el" href="warp__perspective_8cl.xhtml#aa02a47b9dfa96a2705d5c77044a40048">build_perspective_mtx</a> ()</td></tr> |
| <tr class="memdesc:aa02a47b9dfa96a2705d5c77044a40048"><td class="mdescLeft"> </td><td class="mdescRight">Returns the perspective matrix. <a href="#aa02a47b9dfa96a2705d5c77044a40048">More...</a><br/></td></tr> |
| <tr class="separator:aa02a47b9dfa96a2705d5c77044a40048"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a2791d623c1dbcf7e7111b8ff1b7daeeb"><td class="memItemLeft" align="right" valign="top">const float8 </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> |
| <tr class="memdesc:a2791d623c1dbcf7e7111b8ff1b7daeeb"><td class="mdescLeft"> </td><td class="mdescRight">Transforms four 2D coordinates using the formula: <a href="#a2791d623c1dbcf7e7111b8ff1b7daeeb">More...</a><br/></td></tr> |
| <tr class="separator:a2791d623c1dbcf7e7111b8ff1b7daeeb"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ab8f5d79d7699ec7e2a805a25ca0fca2b"><td class="memItemLeft" align="right" valign="top">__kernel void </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> |
| <tr class="memdesc:ab8f5d79d7699ec7e2a805a25ca0fca2b"><td class="mdescLeft"> </td><td class="mdescRight">Performs perspective transformation on an image interpolating with the NEAREAST NEIGHBOUR method. <a href="#ab8f5d79d7699ec7e2a805a25ca0fca2b">More...</a><br/></td></tr> |
| <tr class="separator:ab8f5d79d7699ec7e2a805a25ca0fca2b"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a5dba6d401b54fd02d20a2ba246668d93"><td class="memItemLeft" align="right" valign="top">__kernel void </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> |
| <tr class="memdesc:a5dba6d401b54fd02d20a2ba246668d93"><td class="mdescLeft"> </td><td class="mdescRight">Performs a perspective transform on an image interpolating with the BILINEAR method. <a href="#a5dba6d401b54fd02d20a2ba246668d93">More...</a><br/></td></tr> |
| <tr class="separator:a5dba6d401b54fd02d20a2ba246668d93"><td class="memSeparator" colspan="2"> </td></tr> |
| </table> |
| <h2 class="groupheader">Function Documentation</h2> |
| <a class="anchor" id="a2791d623c1dbcf7e7111b8ff1b7daeeb"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="mlabels"> |
| <tr> |
| <td class="mlabels-left"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">const float8 apply_perspective_transform </td> |
| <td>(</td> |
| <td class="paramtype">const float2 </td> |
| <td class="paramname"><em>coord</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const float16 </td> |
| <td class="paramname"><em>mtx</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </td> |
| <td class="mlabels-right"> |
| <span class="mlabels"><span class="mlabel">inline</span></span> </td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| |
| <p>Transforms four 2D coordinates using the formula: </p> |
| <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> |
| <p>(x0/z0,y0/z0)</p> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramdir">[in]</td><td class="paramname">coord</td><td>2D coordinate to transform. </td></tr> |
| <tr><td class="paramdir">[in]</td><td class="paramname">mtx</td><td>perspective matrix</td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section return"><dt>Returns</dt><dd>a vector float8 containing four 2D transformed values. </dd></dl> |
| |
| <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> |
| |
| <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> |
| <div class="fragment"><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> {</div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <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>  <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>  <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>  <span class="comment">// NOTE: Do not multiply x&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>  <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>  <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>  <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>  <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>  <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> }</div> |
| </div><!-- fragment --> |
| </div> |
| </div> |
| <a class="anchor" id="aa02a47b9dfa96a2705d5c77044a40048"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="mlabels"> |
| <tr> |
| <td class="mlabels-left"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">const float16 build_perspective_mtx </td> |
| <td>(</td> |
| <td class="paramname"></td><td>)</td> |
| <td></td> |
| </tr> |
| </table> |
| </td> |
| <td class="mlabels-right"> |
| <span class="mlabels"><span class="mlabel">inline</span></span> </td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| |
| <p>Returns the perspective matrix. </p> |
| |
| <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> |
| |
| <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> |
| <div class="fragment"><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> {</div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <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> }</div> |
| </div><!-- fragment --> |
| </div> |
| </div> |
| <a class="anchor" id="a5dba6d401b54fd02d20a2ba246668d93"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">__kernel void warp_perspective_bilinear </td> |
| <td>(</td> |
| <td class="paramtype">__global uchar * </td> |
| <td class="paramname"><em>in_ptr</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>in_stride_x</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>in_step_x</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>in_stride_y</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>in_step_y</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>in_offset_first_element_in_bytes</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">__global uchar * </td> |
| <td class="paramname"><em>out_ptr</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>out_stride_x</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>out_step_x</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>out_stride_y</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>out_step_y</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const int </td> |
| <td class="paramname"><em>width</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const int </td> |
| <td class="paramname"><em>height</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| |
| <p>Performs a perspective transform on an image interpolating with the BILINEAR method. </p> |
| <p>Input and output are single channel U8.</p> |
| <dl class="section attention"><dt>Attention</dt><dd>The matrix coefficients need to be passed at compile time:<br/> |
| const char build_options [] = "-DMAT0=1 -DMAT1=2 -DMAT2=3 -DMAT3=4 -DMAT4=5 -DMAT5=6 -DMAT6=7 -DMAT7=8 -DMAT8=9"<br/> |
| clBuildProgram( program, 0, NULL, build_options, NULL, NULL);</dd></dl> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramdir">[in]</td><td class="paramname">in_ptr</td><td>Pointer to the source image. Supported data types: U8. </td></tr> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the destination image. Supported data types: U8. </td></tr> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the destination image </td></tr> |
| <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the destination image </td></tr> |
| </table> |
| </dd> |
| </dl> |
| |
| <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> |
| |
| <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#l00093">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="helpers_8h_source.xhtml#l00096">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#l00133">Image::ptr</a>.</p> |
| <div class="fragment"><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> {</div> |
| <div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <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> |
| <div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <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> |
| <div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  vstore4(<a class="code" href="warp__helpers_8h.xhtml#abea9f226daf3e0ad741d03cf7417d353">bilinear_interpolate</a>(&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> }</div> |
| <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#l00096">helpers.h:96</a></div></div> |
| <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> |
| <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#l00093">helpers.h:93</a></div></div> |
| <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> |
| <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#l00131">helpers.h:131</a></div></div> |
| <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#l00133">helpers.h:133</a></div></div> |
| <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> |
| <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> |
| </div><!-- fragment --> |
| </div> |
| </div> |
| <a class="anchor" id="ab8f5d79d7699ec7e2a805a25ca0fca2b"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">__kernel void warp_perspective_nearest_neighbour </td> |
| <td>(</td> |
| <td class="paramtype">__global uchar * </td> |
| <td class="paramname"><em>in_ptr</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>in_stride_x</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>in_step_x</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>in_stride_y</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>in_step_y</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>in_offset_first_element_in_bytes</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">__global uchar * </td> |
| <td class="paramname"><em>out_ptr</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>out_stride_x</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>out_step_x</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>out_stride_y</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>out_step_y</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">uint </td> |
| <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const int </td> |
| <td class="paramname"><em>width</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const int </td> |
| <td class="paramname"><em>height</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| |
| <p>Performs perspective transformation on an image interpolating with the NEAREAST NEIGHBOUR method. </p> |
| <p>Input and output are single channel U8.</p> |
| <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> |
| <p>output(x,y) = input(x0/z0,y0/z0)</p> |
| <dl class="section attention"><dt>Attention</dt><dd>The matrix coefficients need to be passed at compile time:<br/> |
| const char build_options [] = "-DMAT0=1 -DMAT1=2 -DMAT2=3 -DMAT3=4 -DMAT4=5 -DMAT5=6 -DMAT6=7 -DMAT7=8 -DMAT8=9"<br/> |
| clBuildProgram( program, 0, NULL, build_options, NULL, NULL);</dd></dl> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramdir">[in]</td><td class="paramname">in_ptr</td><td>Pointer to the source image. Supported data types: U8. </td></tr> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the destination image. Supported data types: U8. </td></tr> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the destination image </td></tr> |
| <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the destination image </td></tr> |
| </table> |
| </dd> |
| </dl> |
| |
| <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> |
| |
| <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#l00093">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="helpers_8h_source.xhtml#l00096">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#l00133">Image::ptr</a>, and <a class="el" href="warp__helpers_8h_source.xhtml#l00045">read_texels4()</a>.</p> |
| <div class="fragment"><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> {</div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <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> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <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> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  vstore4(<a class="code" href="warp__helpers_8h.xhtml#aba42442a4c991cdbb52727fa370676f1">read_texels4</a>(&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> }</div> |
| <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> |
| <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#l00096">helpers.h:96</a></div></div> |
| <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> |
| <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#l00093">helpers.h:93</a></div></div> |
| <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> |
| <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#l00131">helpers.h:131</a></div></div> |
| <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#l00133">helpers.h:133</a></div></div> |
| <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> |
| <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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