test.c

来自「TMS320VC55XX 图像 处理程序」· C语言 代码 · 共 68 行

#include <stdio.h> 
#include <imagelib.h>
#pragma DATA_SECTION(imageBlock,"mydata");  
#pragma DATA_SECTION(output,"myout");

short  imageBlock[64]={ // A sample of 2-D 8*8 DCT coefficients of the image block.
                        // Q16.0 format.
    32,    15,     6,    -1,    -1,    -2,    -1,     1,
     7,     3,    -1,    -4,     0,     2,     1,    -1,
    -3,    -2,     1,     3,    -3,    -1,     3,    -1,
     7,     1,    -1,     0,     0,     0,     1,    -2,
     0,     4,     3,    -2,    -2,     1,    -1,     3,
    -4,     2,     2,    -3,     1,     0,    -1,     2,
    -2,    -2,    -1,    -2,    -2,     3,     1,    -1,
     3,     0,    -2,     1,    -1,     0,     2    -1  };
short  zigzag[64]={ 0,  1, 5, 6, 14, 15, 27, 28,
                    2,  4, 7, 13, 16, 26, 29, 42,
                    3,  8, 12, 17, 25, 30, 41, 43,
                    9,  11, 18, 24, 31, 40, 44, 53,
                    10, 19, 23, 32, 39, 45, 52, 54,
                    20, 22, 33, 38, 46, 51, 55, 60,
                    21, 34, 37, 47, 50, 56, 59, 61,
                    35, 36, 48, 49, 57, 58, 62, 63};
                 
short Q_table[64]={ 16, 11, 10, 16, 24, 40, 51, 61,
                    12, 12, 14, 19, 26, 59, 60, 55,
                    14, 13, 16, 24, 40, 57, 69, 56,
                    14, 17, 22, 29, 51, 87, 80, 62,
                    18, 22, 37, 56, 68, 109, 103, 77,
                    24, 35, 55, 64, 81, 104, 113, 92,
                    49, 64, 78, 87, 103, 121, 120, 101,
                    72, 92, 95, 98, 112, 100, 103, 99};
 
int output_zigzag[64]; 
int output[64];
void main()
{ 
  int i; 
 // for(i=0;i<64;i++) // other test data
  //imageBlock[i]=-100; 
 IMG_jpeg_make_recip_tbl(Q_table);
  /* Expected recip-table
                    2048, 2978, 3276, 2048, 1365, 819, 642, 537,
                    2730, 2730, 2340, 1724, 1260, 564, 546, 595,
                    2340, 2520, 2048, 1365, 819, 574, 474, 585,
                    2340, 1927, 1489, 1129, 642, 376, 409, 528,
                    1820, 1489, 885,  585, 481,  300, 318, 425,                    
                    1365, 936,  595,  512, 404, 315, 289, 356,
                    668,  512,  420,  376, 318, 270, 273, 324,  
                    455,  356,  344,  334,  292, 327, 318, 330};
*/
 IMG_jpeg_quantize(imageBlock,zigzag,Q_table,output_zigzag);
 
 for(i=0;i<64;i++) // output in normal order
 output[i]=output_zigzag[zigzag[i]]; 
 /* expected output is 
    2 1 1 0 0 0 0 0
    1 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0
   */ 
 
 
}