Remove Even Rows and Columns From Image

IMAGE_DECIMATE is a MATLAB program 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.

Related Data and Programs:

  • 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_DENOISE, a MATLAB library which applies image processing techniques to remove noise from an image.

    IMAGE_DENOISE_SPMD, a MATLAB program which demonstrates the SPMD parallel programming feature for image operations; the client reads an image, the workers process portions of it, and the client assembles and displays the results.

    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_QUANTIZATION, 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.

    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.

    Source Code:

    Examples and Tests:

    casablanca is a grayscale image from a movie.

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

    Last revised on 02 May 2016.