Blurring 8 bit color versus monochrome using Matlab % smoothing in eight bit color and monochrome % parameter definition % get image from MATLAB library load(’clown’); % construct convolution functions [m,n] = size(X); gs = [0.5 0.5]; ge = []; hs = [0.5 0.5]; he = []; g = [gs,zeros(1,m-length(gs)-length(ge)),ge]; h = [hs,zeros(1,n-length(hs)-length(he)),he]; [...]
Program for Edge detection % demonstrate edge detection % numbers of colors sncols=128; ncols=32; % get image from MATLAB image load(’trees’); % show original image figure(1); showgimg(real(X),sncols); drawnow; % construct convolution functions [m,n] = size(X); gs = [1 -1]; ge = []; hs = [1 -1]; he = []; [...]
Program for Image Restoration % load image X = double(imread(’midterm.bmp’)); X = X-mean(X(:)); [m,n] = size(X); % show image and DFT fX = fft2(X); figure(1) imshow(real(X),[]); title(’original image’) figure(2) imshow(fftshift(log(1+abs(fX))),[]) title(’log(1+|DFT|)) original image’); % model blurring filter s = 24; t= 0; u = 1; v=0; g = [ones(s,1);zeros(m-s-t,1); ones(t,1)]; %g = [...]
Program for image morphology Demonstrate boundary extraction, interior filling % demonstrate morphological boundary extraction %clear all, close all A0=imread(’myshap4.bmp’); imshow(A0); % a heart shape hand drawing title(’original image’); pause % A0 contains mostly 1s and the drawing contains 0s, uint8 A1=1-double(A0); % invert black and white B=ones(3); A2=imopen(imclose(A1,B),B); % fill 1 pixel [...]
Program for Image Segmentation demonstration of global and local thresholding for segmentation % threshdemo.m % Demonstration of global and local threshold operations of an image clear all [tmp,idx]=imread(’lena.bmp’); a=ind2gray(tmp,idx); % gray scale image of lena, value between 0 and 1 clear tmp idx figure(1),clf,colormap(’gray’),imshow(a),title(’original Lena image’) [m,n]=size(a); % size of image a b=reshape(a,m*n,1); % [...]
Program for color image processing Color Approximation To reduce the number of colors in an image, use the rgb2ind function. This function converts a truecolor image to an indexed image, reducing the number of colors in the process. rgb2ind provides the following methods for approximating the colors in the original image: Quantization Uniform quantization Minimum variance quantization Colormap [...]
Program for Image Compression Aa standard matlab wavelet code package, WAVELAB 802 , to perform the transforms. The wavelets we chose to use were the Deslauriers wavelets of polynomial size 3. The compression scheme we used was to set a threshold value that was some fraction of the norm of the entire wavelet transform matrix. [...]
Image enhancement Adjusting Intensity Values to a Specified Range You can adjust the intensity values in an image using the imadjust function, where you specify the range of intensity values in the output image. For example, this code increases the contrast in a low-contrast grayscale image by remapping the data values to fill the entire [...]