readimage.c

包含了对于灰度图像的8种jpeg无损压缩的预测方法

#include <stdio.h>

void readimage(char filename[], unsigned char **image, int row_size, int col_size)

/***********************************************************************
*                                                                      *
*  File: readimage.c                                                   *
*  Function:  reads an image (what else :?)                            *
*  Author  : K. Sayood                                                 *
*  Last mod: 5/12/95                                                   *
*  Usage:  see usage()                                                 *
*                                                                      *
*                                                                      *
*  filename[] : character string containing filename                   *
*  **image    : array of pointers pointing to the rows in an image     *
*  row_size   : number of rows in the image                            *
*  col_size   : number of columns in the image.                        *
*                                                                      *
***********************************************************************/

/*******************************************************************************
*NOTICE:                                                                       *
*This code is believed by the author to be bug free.  You are free to use and  *
*modify this code with the understanding that any use, either direct or        *
*derivative, must contain acknowledgement of its author and source.  The author*
*makes no warranty of any kind, expressed or implied, of merchantability or    *
*fitness for a particular purpose.  The author shall not be held liable for any*
*incidental or consequential damages in connection with or arising out of the  *
*furnishing, performance, or use of this software.  This software is not       *
*authorized for use in life support devices or systems.                        *
********************************************************************************/

    {int r, c;
     FILE *infile;

     infile = fopen(filename,"rb");
     if (infile == NULL)
	{fprintf(stderr, "Unable to open file %s", filename);
	 exit(1);
	}

     for(r=0; r<row_size; r++)
	 fread(image[r],col_size,sizeof(char),infile);
         
     fclose(infile);
    }