img_pix_expand.h64

此程序使用的集成环境为TI公司的CCS。程序的平台是使用合众达的VPMDM642 c_fusejiance是用DSP进行肤色检测。人体的皮肤颜色是人体的一个重要特征

;* ======================================================================== *;
;*  TEXAS INSTRUMENTS, INC.                                                 *;
;*                                                                          *;
;*  IMGLIB  DSP Image/Video Processing Library                              *;
;*                                                                          *;
;*      Release:        Version 1.03                                        *;
;*      CVS Revision:   1.8     Sun Sep 29 03:26:45 2002 (UTC)              *;
;*      Snapshot date:  28-Oct-2002                                         *;
;*                                                                          *;
;*  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) 2002 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.                                    *;
;* ======================================================================== *;
* ========================================================================= *
*   TEXAS INSTRUMENTS, INC.                                                 *
*                                                                           *
*   NAME                                                                    *
*       IMG_pix_expand                                                      *
*                                                                           *
*   REVISION DATE                                                           *
*       19-Jan-2001                                                         *
*                                                                           *
*   USAGE                                                                   *
*       This routine is C-callable and can be called as:                    *
*                                                                           *
*       void IMG_pix_expand                                                 *
*       (                                                                   *
*           int n,                                    /* # of elements */   *
*           const unsigned char *restrict in_data,    /* Input data    */   *
*           short               *restrict out_data    /* Output data   */   *
*       )                                                                   *
*                                                                           *
*                                                                           *
*   DESCRIPTION                                                             *
*       The code takes an array of bytes and promotes them to half-words    *
*       by zero-extension.                                                  *
*                                                                           *
*       This is the C equivalent of the assembly code, without              *
*       restrictions.  The assembly code has restrictions, as noted below.  *
*                                                                           *
*       void IMG_pix_expand                                                 *
*       (                                                                   *
*           int n,                                                          *
*           const unsigned char *restrict in_data,                          *
*           short               *restrict out_data                          *
*       )                                                                   *
*       {                                                                   *
*           int i;                                                          *
*                                                                           *
*           for (i = 0; i < n; i++)                                         *
*               out_data[i] =  in_data[i];                                  *
*       }                                                                   *
*                                                                           *
*   ASSUMPTIONS                                                             *
*       Input and output arrays must be double-word (8-byte) aligned.       *
*                                                                           *
*       The input must be at least 16 elements long and contain a           *
*       multiple of 16 elements.                                            *
*                                                                           *
*   NOTE                                                                    *
*       Interrupts are masked during the entire duration of this            *
*       function, as the entire function occurs within branch delay slots.  *
*                                                                           *
*   MEMORY NOTE                                                             *
*       No bank conflicts occur.  This is a LITTLE ENDIAN implementation.   *
*                                                                           *
*   TECHNIQUES                                                              *
*       The loop is unrolled 16 times, loading bytes with LDDW.  It uses    *
*       UNPKHU4 and UNPKLU4 to unpack the data and store the results with   *
*       STDW.                                                               *
*                                                                           *
*       To shave a few extra cycles from the function, the return branch    *
*       is issued from within the kernel.                                   *
*                                                                           *
*   CYCLES                                                                  *
*       cycles = 3 * n/16 + 15.                                             *
*       For n = 1072, cycles = 216.                                         *
*                                                                           *
*   CODESIZE                                                                *
*       108 bytes.                                                          *
*                                                                           *
* ------------------------------------------------------------------------- *
*             Copyright (c) 2002 Texas Instruments, Incorporated.           *
*                            All Rights Reserved.                           *
* ========================================================================= *

        .global _IMG_pix_expand

* ========================================================================= *
*   End of file:  img_pix_expand.h64                                        *
* ------------------------------------------------------------------------- *
*             Copyright (c) 2002 Texas Instruments, Incorporated.           *
*                            All Rights Reserved.                           *
* ========================================================================= *