RM0020 datasheet(37/69 Pages) STMICROELECTRONICS

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RM0020

Function API

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Shift each computed bij by shift bits to the right:

Range limit to 0..255:

if (bij <0) then bij =0,

if (bij > 255) then bij =255

Note: The input/output images and convolution kernel must be properly aligned in memory

as described in Table 17. And there must be 1 byte of readable memory behind the

convolution kernel c.

Performance: See Section 7 and Table 48.

Example 17. conv3x3

#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 2 bytes */

#ifdef __ghs__

#pragma alignvar (2)

#endif

ALIGN_DCC(2)

signed char c[3*3] ALIGN_MWERKS(2) = {

-1,

-2,

-1,

};

/* #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)

{

/******** 2-D convolution with 3x3 kernel *********/

M = 16;

N = 12;

shift = 4;

conv3x3(a, b, c, M, N, shift);

}

shift



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