Computer Project for Chapter 11.  (a) Obtain a set of YCrCb images for the set of 256x256 RGB Lena

Images (Lena256C.bmp is a color input image) (b) Obtain a set of HIS images for the set of RGB images

2. Obtain images subsampled with (2:1)x(2:1), (4:1)x(4:1) from 512x512 Lena image. Display the original image and the subsampled ones with the same size and compare their qualities (Le512.raw is a gray input image).

3. Obtain 1-, 2-, 4-, 6-bit images from 8-bit 512x512 Lena image. Display the original image and the outputs, and compare their qualities (Le512.raw is a gray input image).

Note:    1. Lena256C is a bitmap color image. You should read it out in your program using the following referenced function in C++, and then RGB images will be stored in * * * array for further processing

======unsigned char*** ReadRGB(char *str, int &height, int &width, int &bit)

{

            unsigned char ***rgb=NULL;

            FILE *fp;

            if((fp=fopen(str,"rb"))==NULL)

            {

                        // AfxMessageBox("file open error");

                        return(rgb);

            }

            BITMAPFILEHEADER bmpfileheader;

            fread(&bmpfileheader,sizeof(BITMAPFILEHEADER),1,fp);

            BITMAPINFOHEADER bmpinfoheader;

            fread(&bmpinfoheader,sizeof(BITMAPINFOHEADER),1,fp);

            bit=bmpinfoheader.biBitCount;

            int byte_count=bit/8;

            height=bmpinfoheader.biHeight;

            width=bmpinfoheader.biWidth;

            if(bit!=24&&bit!=8)

            {

                        // AfxMessageBox("No 8bit or 24bit image!.");

                        fclose(fp);                     

                        return(rgb);

            }

            rgb=(unsigned char***)malloc(byte_count*sizeof(unsigned char**));

            for(int i=0;i<byte_count;i++)

            {

                        rgb[i]=(unsigned char**)malloc(height*sizeof(unsigned char*));                   

                        for(int y=0;y<height;y++)

                                    rgb[i][y]=(unsigned char*)malloc(width);                                                                           

            }

            for(int y=0;y<height;y++)

                        for(int x=0;x<width;x++)

                        {

                                    for(i=0;i<byte_count;i++)

                                    {                                                          

                                                rgb[byte_count-i-1][x][y]=getc(fp);

                                    }

                        }

            fclose(fp);

            return(rgb);

}======2.  Lena.raw is a 8-bit gray scale image. You may refer the following code:======float   x[256][256], y[256][256];    //x array for in put, y array for outputFILE   *fo ,*fs ;            int    i,j;                        fo=fopen("lena.raw","rb");//for reading raw image            for(i=0;i<256;i++)            {                        for(j=0; j<256; j++)                        {        x[i][j]=(float)getc(fo);                        }            }fs=fopen("output.raw","wb");// for writing raw image   for(i=0;i<256;i++)   {

               for(j=0;j<256;j++)               {                           putc((unsigned char)y[i][j],fs);               }   }  }