ureadfile.cpp

微软的基于HMM的人脸识别原代码, 非常经典的说

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#include "CvTest.h"

/* BMP Header structure */
typedef struct _atsBMPHeader
{
    /*unsigned short bfType;*/
    long           bfSize,
                   bfReserved,
                   bfOffBits,
                   biSize,
                   biWidth,
                   biHeight;
    unsigned short biPlanes,
                   biBitCount;
    long           biCompression,
                   biSizeImage,
                   biXPelsPerMeter,
                   biYPelsPerMeter,
                   biClrUsed,
                   biClrImportant;
} atsBMPHeader;


IplImage* atsCreateImageFromFile( const char* filename )
{   
    char  fname[1000];
    char *ext;

    IplImage* img = 0;
    FILE* file;
    
    ext = strrchr( filename, '.' );
    
    if( !ext || (strcmp( ext, ".BMP" ) && strcmp( ext, ".bmp" )))
    {
        strcpy( fname, filename );
        strcat( fname, ".bmp" );
        filename = fname;
    }

    file = fopen( filename, "rb" );

    if( file )
    {
        char  bmp_sign[] = "BM\0";
        atsBMPHeader header;

        /* check BMP signature */
        if( fread( bmp_sign, 2, 1, file ) && !strcmp( bmp_sign, "BM" ))
        {
            /* read header information */
            fread( &header, sizeof(header), 1, file );

            if( header.biSize >= 40 && header.biCompression == 0 &&
                (header.biBitCount == 8 || header.biBitCount == 24))
            {
                int nch = header.biBitCount / 8;
                int i, row_length = (header.biWidth * nch + 3) & -4;

                fseek( file, header.bfOffBits, 0 );

                img = atsCreateImage( header.biWidth, header.biHeight,
                                      IPL_DEPTH_8U, nch, 0 );

                strncpy( img->colorModel, nch == 3 ? "RGB" : "GRAY", 4 );
                strncpy( img->channelSeq, nch == 3 ? "BGR" : "GRAY", 4 );

                for( i = 0; i < header.biHeight; i++ )
                {
                    fread( img->imageData + (img->height - i - 1)*img->widthStep,
                           row_length, 1, file );
                }
            }
        }

        fclose( file );
    }
    
    return img;
}    

/* End of file. */