IMAGE_QUANTIZATION
Reduce Number of Colors in an Image


IMAGE_QUANTIZATION is a MATLAB library which demonstrates how the KMEANS algorithm can be used to reduce the number of colors or shades of gray in an image.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

IMAGE_QUANTIZATION is available in a MATLAB version.

Related Data and Programs:

CELL_DETECTION_TASKS, a MATLAB program which creates modified versions of a sequence of gray-scale TIF files containing images of cells; the process of each file is carried out independently, using the "task" feature of MATLAB's parallel computing toolbox.

COLOR_REMOTE, a MATLAB program which carries out the color segmentation of an image in parallel, via SPMD commands; this includes instructions on how to run the job, via MATLAB's BATCH facility, on a remote system such as Virginia Tech's ITHACA cluster.

CONTRAST_SPMD, a MATLAB program which demonstrates the SPMD parallel programming feature for image operations; the client reads an image, the workers increase contrast over separate portions, and the client assembles and displays the results.

CONTRAST2_SPMD, a MATLAB program which demonstrates the SPMD parallel programming feature for image operations; this improves the contrast_spmd program by allowing the workers to share some data; this makes it possible to eliminate artificial "seams" in the processed image.

IMAGE_BOUNDARY, a MATLAB library which reports the pixels which form the boundary between the black and white regions of a simple image.

IMAGE_COMPONENTS, a MATLAB library which seeks the connected "nonzero" or "nonblack" components of an image or integer vector, array or 3D block.

IMAGE_CONTRAST, a MATLAB program which applies image processing techniques to increase the contrast in an image.

IMAGE_DECIMATE, a MATLAB library which compresses an image by dropping the even rows and columns of data.

IMAGE_DENOISE, a MATLAB program which applies image processing techniques to remove noise from an image.

IMAGE_DIFFUSE, a MATLAB library which uses diffusion to smooth out an image.

IMAGE_DOUBLE, a MATLAB library which doubles the height and width of an image by repeating each row and column.

IMAGE_EDGE, a MATLAB library which demonstrates a simple procedure for edge detection in images.

IMAGE_MATCH_GENETIC, a MATLAB program which tries to match a 256x256 JPEG image by blending 32 colored rectangles, using ideas from genetic algorithms, based on an example by Nick Berry.

IMAGE_NOISE, MATLAB programs which add noise to an image.

IMAGE_RGB_TO_GRAY, MATLAB programs which makes a grayscale version of an RGB image.

IMAGE_THRESHOLD, MATLAB programs which make a black and white version of a grayscale image by setting all pixels below or above a threshold value to black or white.

KMEANS, a MATLAB library which contains several different algorithms for the K-Means problem.

Reference:

  1. Jonas Gomes, Luiz Velho,
    Image Processing for Computer Graphics,
    Springer, 1997,
    ISBN: 0387948546,
    LC: T385.G65.

MathWorks documentation for the Image Processing Toolbox is available at http://www.mathworks.com/access/helpdesk/help/pdf_doc/images/images_tb.pdf.

Source Code:

Examples and Tests:

BEATLES is a snapshot of Paul, Ringo, George and John.

CASABLANCA is a still from the movie "Casablanca".

SNAP is a snapshot of a mother and daughter.

You can go up one level to the MATLAB source codes.


Last modified on 21 May 2016.