📄 img_conv_3x3.h64
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;* ======================================================================== *;
;* TEXAS INSTRUMENTS, INC. *;
;* *;
;* IMGLIB DSP Image/Video Processing Library *;
;* *;
;* Release: Revision 1.04b *;
;* CVS Revision: 1.5 Sun Sep 29 03:32:19 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_conv_3x3 -- 3x3 convolution *
* *
* REVISION DATE *
* 19-May-2002 *
* *
* USAGE *
* This routine has the following C prototype: *
* *
* void IMG_conv_3x3 ( const unsigned char *restrict inptr, *
* unsigned char *restrict outptr, *
* int x_dim, *
* const char *restrict mask, *
* int shift) *
* *
* The convolution routine accepts three rows of 'x_dim' input points *
* and performs some operation on each. A total of 'x_dim' outputs *
* are written to the output array. The 'mask' array has the 3 by 3 *
* array of coefficients. *
* *
* DESCRIPTION *
* *
* The convolution kernel accepts three rows of 'x_dim' input points *
* and produces one output row of 'x_dim' points using the input mask *
* of 3 by 3. The user defined shift value is used to shift the convo- *
* lution value, down to the byte range. The convolution sum is also *
* range limited to 0..255. The shift amount is non-zero for low pass *
* filters, and zero for high pass and sharpening filters. *
* *
* *
* The following is the C code model for the algorithm: *
* *
* *
* void IMG_conv_3x3( const unsigned char *restrict inptr, *
* unsigned char *restrict outptr, *
* int x_dim, *
* const char *restrict mask, *
* int shift) *
* { *
* const unsigned char *IN1,*IN2,*IN3; *
* unsigned char *OUT; *
* *
* short pix10, pix20, pix30; *
* short mask10, mask20, mask30; *
* *
* int sum, sum00, sum11; *
* int i; *
* int sum22, j; *
* *
* IN1 = inptr; *
* IN2 = IN1 + x_dim; *
* IN3 = IN2 + x_dim; *
* OUT = outptr; *
* *
* for (j = 0; j < x_dim ; j++) *
* { *
* sum = 0; *
* *
* for (i = 0; i < 3; i++) *
* { *
* pix10 = IN1[i]; *
* pix20 = IN2[i]; *
* pix30 = IN3[i]; *
* *
* mask10 = mask[i]; *
* mask20 = mask[i + 3]; *
* mask30 = mask[i + 6]; *
* *
* sum00 = pix10 * mask10; *
* sum11 = pix20 * mask20; *
* sum22 = pix30 * mask30; *
* *
* sum += sum00 + sum11+ sum22; *
* } *
* *
* IN1++; *
* IN2++; *
* IN3++; *
* *
* sum = (sum >> shift); *
* if ( sum < 0 ) sum = 0; *
* if ( sum > 255 ) sum = 255; *
* *OUT++ = sum; *
* } *
* } *
* *
* *
* TECHNIQUES *
* The inner loop that computes the convolution sum is completely *
* unrolled and 8 output pixels are computed together. The mask *
* values are loaded and packed as double words. *
* *
* ASSUMPTIONS *
* x_dim must be a multiple of 8. *
* *
* NOTES *
* None *
* *
* CYCLES *
* 33 + x_dim/8 * 9 *
* *
* CODESIZE *
* 724 bytes *
* ------------------------------------------------------------------------- *
* Copyright (c) 2003 Texas Instruments, Incorporated. *
* All Rights Reserved. *
* ========================================================================= *
.global _IMG_conv_3x3
* ========================================================================= *
* End of file: img_conv_3x3.h64 *
* ------------------------------------------------------------------------- *
* Copyright (c) 2003 Texas Instruments, Incorporated. *
* All Rights Reserved. *
* ========================================================================= *
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