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RM0020 Datasheet(PDF) 40 Page - STMicroelectronics |
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RM0020 Datasheet(HTML) 40 Page - STMicroelectronics |
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40 / 69 page  Function API RM0020 40/69 Algorithm: 1. Compute horizontal sobel filter, i.e. compute 2-D convolution with the following kernel: 2. Get absolute value of result 3. Range limit to 0..255 Note: The input/output images must be properly aligned in memory as described in Table 19. Performance: See Section 7 and Table 50. Example 19. sobel3x3_horizontal #include "libdsp2.h" /* #pragma and ALIGN macros used to align to 4 bytes */ #ifdef __ghs__ #pragma alignvar (4) #endif ALIGN_DCC(4) unsigned char a[16*12]; /* #pragma and ALIGN macros used to align to 4 bytes */ #ifdef __ghs__ #pragma alignvar (4) #endif ALIGN_DCC(4) unsigned char b[16*12] ALIGN_MWERKS(4); unsigned short M, N, shift; void main(void) { /******** Horizontal sobel filter *********/ M = 16; N = 12; sobel3x3_horizontal(a, b, M, N); } 6.20 sobel3x3_vertical - vertical sobel filter Function call: void sobel3x3_vertical(unsigned char *a, unsigned char *b, unsigned short M, unsigned short N); G y 1 – 2 – 1 – 000 120 = |
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