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118 lines
8.5 KiB
118 lines
8.5 KiB
3 years ago
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/* ======================================================================== */
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/* TEXAS INSTRUMENTS, INC. */
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/* */
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/* IMGLIB DSP Image/Video Processing Library */
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/* */
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/* Release: Revision 1.04b */
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/* CVS Revision: 1.3 Sun Sep 29 03:32:28 2002 (UTC) */
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/* Snapshot date: 23-Oct-2003 */
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/* */
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/* This library contains proprietary intellectual property of Texas */
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/* Instruments, Inc. The library and its source code are protected by */
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/* various copyrights, and portions may also be protected by patents or */
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/* other legal protections. */
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/* */
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/* This software is licensed for use with Texas Instruments TMS320 */
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/* family DSPs. This license was provided to you prior to installing */
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/* the software. You may review this license by consulting the file */
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/* TI_license.PDF which accompanies the files in this library. */
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/* ------------------------------------------------------------------------ */
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/* Copyright (C) 2003 Texas Instruments, Incorporated. */
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/* All Rights Reserved. */
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/* ======================================================================== */
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/* ======================================================================== */
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/* Assembler compatibility shim for assembling 4.30 and later code on */
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/* tools prior to 4.30. */
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/* ======================================================================== */
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/* ======================================================================== */
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/* End of assembler compatibility shim. */
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/* ======================================================================== */
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/* ======================================================================== */
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/* NAME */
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/* IMG_sad_16x16 -- Sum of Absolute Differences on single 16x16 block */
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/* */
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/* USAGE */
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/* unsigned IMG_sad_16x16 */
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/* ( */
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/* const unsigned char *restrict srcImg, // 16x16 source block // */
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/* const unsigned char *restrict refImg, // Reference image // */
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/* int pitch // Width of ref image // */
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/* ); */
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/* */
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/* The code accepts a pointer to the 16x16 source block (srcImg), */
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/* and a pointer to the upper-left corner of a target position in */
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/* a reference image (refImg). The width of the reference image */
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/* is given by the pitch argument. */
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/* */
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/* The function returns the sum of the absolute differences */
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/* between the source block and the 16x16 region pointed to in the */
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/* reference image. */
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/* */
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/* DESCRIPTION */
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/* The algorithm takes the difference between the pixel values in */
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/* the source image block and the corresponding pixels in the */
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/* reference image. It then takes the absolute values of these */
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/* differences, and accumulates them over the entire 16x16 region. */
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/* It returns the final accumulation. */
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/* */
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/* C CODE */
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/* The following is a C code description of the algorithm that lacks */
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/* restrictions. The assembly code may have additional restrictions */
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/* as noted below. */
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/* */
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/* unsigned IMG_sad_16x16 */
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/* ( */
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/* const unsigned char *restrict srcImg, */
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/* const unsigned char *restrict refImg, */
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/* int pitch */
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/* ) */
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/* { */
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/* int i, j; */
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/* unsigned sad = 0; */
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/* */
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/* for (i = 0; i < 16; i++) */
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/* for (j = 0; j < 16; j++) */
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/* sad += abs(srcImg[j+i*16] - refImg[j+i*pitch]); */
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/* */
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/* return sad; */
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/* } */
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/* */
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/* ASSUMPTIONS */
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/* Some versions of this kernel may assume that srcImg is double- */
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/* word aligned. */
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/* */
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/* MEMORY NOTE */
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/* No bank conflicts occur. */
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/* Endian Neutral. */
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/* */
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/* NOTES */
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/* This kernel blocks interrupts for 61 cycles. */
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/* */
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/* CYCLES */
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/* 67 cycles */
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/* */
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/* CODESIZE */
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/* 168 bytes */
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/* */
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/* ------------------------------------------------------------------------ */
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/* Copyright (c) 2003 Texas Instruments, Incorporated. */
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/* All Rights Reserved. */
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/* ======================================================================== */
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#ifndef IMG_SAD_16X16_H_
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#define IMG_SAD_16X16_H_ 1
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unsigned IMG_sad_16x16
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(
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const unsigned char *restrict srcImg, /* 16x16 source block */
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const unsigned char *restrict refImg, /* Reference image */
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int pitch /* Width of ref image */
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);
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#endif
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/* ======================================================================== */
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/* End of file: img_sad_16x16.h */
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/* ------------------------------------------------------------------------ */
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/* Copyright (c) 2003 Texas Instruments, Incorporated. */
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/* All Rights Reserved. */
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/* ======================================================================== */
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