You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
8.5 KiB
117 lines
8.5 KiB
/* ======================================================================== */
|
|
/* TEXAS INSTRUMENTS, INC. */
|
|
/* */
|
|
/* IMGLIB DSP Image/Video Processing Library */
|
|
/* */
|
|
/* Release: Revision 1.04b */
|
|
/* CVS Revision: 1.3 Sun Sep 29 03:32:28 2002 (UTC) */
|
|
/* Snapshot date: 23-Oct-2003 */
|
|
/* */
|
|
/* This library contains proprietary intellectual property of Texas */
|
|
/* Instruments, Inc. The library and its source code are protected by */
|
|
/* various copyrights, and portions may also be protected by patents or */
|
|
/* other legal protections. */
|
|
/* */
|
|
/* This software is licensed for use with Texas Instruments TMS320 */
|
|
/* family DSPs. This license was provided to you prior to installing */
|
|
/* the software. You may review this license by consulting the file */
|
|
/* TI_license.PDF which accompanies the files in this library. */
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Copyright (C) 2003 Texas Instruments, Incorporated. */
|
|
/* All Rights Reserved. */
|
|
/* ======================================================================== */
|
|
/* ======================================================================== */
|
|
/* Assembler compatibility shim for assembling 4.30 and later code on */
|
|
/* tools prior to 4.30. */
|
|
/* ======================================================================== */
|
|
/* ======================================================================== */
|
|
/* End of assembler compatibility shim. */
|
|
/* ======================================================================== */
|
|
/* ======================================================================== */
|
|
/* NAME */
|
|
/* IMG_sad_16x16 -- Sum of Absolute Differences on single 16x16 block */
|
|
/* */
|
|
/* USAGE */
|
|
/* unsigned IMG_sad_16x16 */
|
|
/* ( */
|
|
/* const unsigned char *restrict srcImg, // 16x16 source block // */
|
|
/* const unsigned char *restrict refImg, // Reference image // */
|
|
/* int pitch // Width of ref image // */
|
|
/* ); */
|
|
/* */
|
|
/* The code accepts a pointer to the 16x16 source block (srcImg), */
|
|
/* and a pointer to the upper-left corner of a target position in */
|
|
/* a reference image (refImg). The width of the reference image */
|
|
/* is given by the pitch argument. */
|
|
/* */
|
|
/* The function returns the sum of the absolute differences */
|
|
/* between the source block and the 16x16 region pointed to in the */
|
|
/* reference image. */
|
|
/* */
|
|
/* DESCRIPTION */
|
|
/* The algorithm takes the difference between the pixel values in */
|
|
/* the source image block and the corresponding pixels in the */
|
|
/* reference image. It then takes the absolute values of these */
|
|
/* differences, and accumulates them over the entire 16x16 region. */
|
|
/* It returns the final accumulation. */
|
|
/* */
|
|
/* C CODE */
|
|
/* The following is a C code description of the algorithm that lacks */
|
|
/* restrictions. The assembly code may have additional restrictions */
|
|
/* as noted below. */
|
|
/* */
|
|
/* unsigned IMG_sad_16x16 */
|
|
/* ( */
|
|
/* const unsigned char *restrict srcImg, */
|
|
/* const unsigned char *restrict refImg, */
|
|
/* int pitch */
|
|
/* ) */
|
|
/* { */
|
|
/* int i, j; */
|
|
/* unsigned sad = 0; */
|
|
/* */
|
|
/* for (i = 0; i < 16; i++) */
|
|
/* for (j = 0; j < 16; j++) */
|
|
/* sad += abs(srcImg[j+i*16] - refImg[j+i*pitch]); */
|
|
/* */
|
|
/* return sad; */
|
|
/* } */
|
|
/* */
|
|
/* ASSUMPTIONS */
|
|
/* Some versions of this kernel may assume that srcImg is double- */
|
|
/* word aligned. */
|
|
/* */
|
|
/* MEMORY NOTE */
|
|
/* No bank conflicts occur. */
|
|
/* Endian Neutral. */
|
|
/* */
|
|
/* NOTES */
|
|
/* This kernel blocks interrupts for 61 cycles. */
|
|
/* */
|
|
/* CYCLES */
|
|
/* 67 cycles */
|
|
/* */
|
|
/* CODESIZE */
|
|
/* 168 bytes */
|
|
/* */
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Copyright (c) 2003 Texas Instruments, Incorporated. */
|
|
/* All Rights Reserved. */
|
|
/* ======================================================================== */
|
|
#ifndef IMG_SAD_16X16_H_
|
|
#define IMG_SAD_16X16_H_ 1
|
|
|
|
unsigned IMG_sad_16x16
|
|
(
|
|
const unsigned char *restrict srcImg, /* 16x16 source block */
|
|
const unsigned char *restrict refImg, /* Reference image */
|
|
int pitch /* Width of ref image */
|
|
);
|
|
|
|
#endif
|
|
/* ======================================================================== */
|
|
/* End of file: img_sad_16x16.h */
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Copyright (c) 2003 Texas Instruments, Incorporated. */
|
|
/* All Rights Reserved. */
|
|
/* ======================================================================== */
|
|
|