image_decimate, a MATLAB code which "decimates" an image by removing the even rows and columns, resulting in a file that is about 1/4 the size of the original.
Modifying an image in this way is a very crude method of compression. However, it does suggest how much redundant information exists in a typical image file.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
image_decimate is available in a MATLAB version.
image_boundary, a MATLAB code which reports the pixels which form the boundary between the black and white regions of a simple image.
image_components, a MATLAB code which seeks the connected "nonzero" or "nonblack" components of an image or integer vector, array or 3D block.
image_contrast, a MATLAB code which applies image processing techniques to increase the contrast in an image.
image_denoise, a MATLAB code which applies image processing techniques to remove noise from an image.
image_diffuse, a MATLAB code which uses diffusion to smooth out an image.
image_double, a MATLAB code which doubles the height and width of an image by repeating each row and column.
image_edge, a MATLAB code which demonstrates a simple procedure for edge detection in images.
image_noise, a MATLAB code which adds noise to an image.
image_quantization, a MATLAB code which demonstrates how the KMEANS algorithm can be used to reduce the number of colors or shades of gray in an image.
image_rgb_to_gray, a MATLAB code which makes a grayscale version of an RGB image.
image_threshold, a MATLAB code which makes a black and white version of a grayscale image by setting all pixels below or above a threshold value to black or white.