image_decimate, an Octave 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 information on this web page is distributed under the MIT license.
image_decimate is available in a MATLAB version and an Octave version. .
image_boundary, an Octave code which reports the pixels which form the boundary between the black and white regions of a simple image.
image_components, an Octave code which seeks the connected "nonzero" or "nonblack" components of an image or integer vector, array or 3D block.
image_contrast, an Octave code which applies image processing techniques to increase the contrast in an image.
image_denoise, an Octave code which applies image processing techniques to remove noise from an image.
image_diffuse, an Octave code which uses diffusion to smooth out an image.
image_double, an Octave code which doubles the height and width of an image by repeating each row and column.
image_edge, an Octave code which demonstrates a simple procedure for edge detection in images.
image_noise, an Octave code which adds noise to an image.
image_quantization, an Octave 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, an Octave code which makes a grayscale version of an RGB image.
image_threshold, an Octave 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.