Compute Library
 22.11
nonmax.cl
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24 #include "helpers.h"
25 
26 /** This function performs Non maxima suppression over a 3x3 window on a given image.
27  *
28  * @param[in] src_ptr Pointer to the source image. Supported data types: U8/F32
29  * @param[in] src_stride_x Stride of the source image in X dimension (in bytes)
30  * @param[in] src_step_x src_stride_x * number of elements along X processed per workitem(in bytes)
31  * @param[in] src_stride_y Stride of the source image in Y dimension (in bytes)
32  * @param[in] src_step_y src_stride_y * number of elements along Y processed per workitem(in bytes)
33  * @param[in] src_offset_first_element_in_bytes The offset of the first element in the source image
34  * @param[out] dst_ptr Pointer to the destination image. Supported data types: same as @p scr_ptr
35  * @param[in] dst_stride_x Stride of the destination image in X dimension (in bytes)
36  * @param[in] dst_step_x dst_stride_x * number of elements along X processed per workitem(in bytes)
37  * @param[in] dst_stride_y Stride of the destination image in Y dimension (in bytes)
38  * @param[in] dst_step_y dst_stride_y * number of elements along Y processed per workitem(in bytes)
39  * @param[in] dst_offset_first_element_in_bytes The offset of the first element in the destination image
40  */
41 __kernel void non_max_suppression(
44 {
47 
48  VEC_DATA_TYPE(DATA_TYPE, 8)
49  vc = vload8(0, (__global DATA_TYPE *)src.ptr);
50 
51  if(all(vc == (DATA_TYPE)0))
52  {
53  vstore8(0, 0, (__global DATA_TYPE *)dst.ptr);
54 
55  return;
56  }
57 
58  VEC_DATA_TYPE(DATA_TYPE, 16)
59  nc = vload16(0, (__global DATA_TYPE *)offset(&src, -1, -1));
60  VEC_DATA_TYPE(DATA_TYPE, 8)
61  out = select((DATA_TYPE)0, vc, (vc >= nc.s01234567) && (vc >= nc.s12345678) && (vc >= nc.s23456789));
62 
63  nc = vload16(0, (__global DATA_TYPE *)offset(&src, -1, 0));
64  out = select((DATA_TYPE)0, out, (vc >= nc.s01234567) && (vc > nc.s23456789));
65 
66  nc = vload16(0, (__global DATA_TYPE *)offset(&src, -1, +1));
67  out = select((DATA_TYPE)0, out, (vc > nc.s01234567) && (vc > nc.s12345678) && (vc > nc.s23456789));
68 
69  vstore8(out, 0, (__global DATA_TYPE *)dst.ptr);
70 }
__global uchar * offset(const Image *img, int x, int y)
Get the pointer position of a Image.
Definition: helpers.h:1084
#define CONVERT_TO_IMAGE_STRUCT(name)
Definition: helpers.h:855
#define IMAGE_DECLARATION(name)
Definition: helpers.h:805
SimpleTensor< float > src
Definition: DFT.cpp:155
Structure to hold Image information.
Definition: helpers.h:897
__global uchar * ptr
Pointer to the starting postion of the buffer.
Definition: helpers.h:899
SimpleTensor< T > select(const SimpleTensor< uint8_t > &c, const SimpleTensor< T > &x, const SimpleTensor< T > &y)
Definition: Select.cpp:38
__kernel void non_max_suppression(__global uchar *src_ptr, uint src_stride_x, uint src_step_x, uint src_stride_y, uint src_step_y, uint src_offset_first_element_in_bytes, __global uchar *dst_ptr, uint dst_stride_x, uint dst_step_x, uint dst_stride_y, uint dst_step_y, uint dst_offset_first_element_in_bytes)
This function performs Non maxima suppression over a 3x3 window on a given image. ...
Definition: nonmax.cl:41
#define VEC_DATA_TYPE(type, size)
Definition: helpers.h:728