Codebook

Ibg=imread('E:\IP\codes\flower.jpg'); Ifg=imread('E:\IP\codes\beetle.jpg'); if length(size(Ibg))==3         Ibg=rgb2gray(Ibg); end if length(size(Ifg))==3         Ifg=rgb2gray(Ifg); end alpha = 0.2; [row,col] = size(Ibg); I = zeros(row,col); I = uint8(I); for i = 1:row     for j = 1:col         I(i,j) = alpha * Ibg(i,j) + (1 - alpha) * Ifg(i,j);     end end subplot(1,3,1); imshow(Ibg); subplot(1,3,2); imshow(Ifg); subplot(1,3,3); imshow(I);

I=imread('E:\IP\imgs\lena.jpg'); amin = 0; amax = 255; if length(size(I))==3         I=rgb2gray(I); end alow = min(min(I)); ahigh = max(max(I)); [r,c] = size(I); J = zeros(r,c); for m=1:r     for n=1:c         a = I(m,n);         a1 = amin +((a - alow) * ((amax - amin) / (ahigh - alow)));         J(m,n) = a1;     end end J = uint8(J); subplot(1,2,1); imshow(I); subplot(1,2,2); imshow(J);

Difference between Point Operation and Filters         Filters generally used   more than one pixel from the source image for computing each new pixel values. The capability of Point operation is limited. For example, In Point operation can't blur or sharpen an image.        

Digital Image Processing: Manipulate a digitalized image using a computer. Digital Image Editing: Manipulation of digital images using an existing software application such as Adobe Photoshop or Corel Paint Pixel: The smallest addressable unit of an image. Histogram: Frequency distribution of image intensities.