IMAGE_COMPONENTS
Connected Components of an Image or Matrix

IMAGE_COMPONENTS is a MATLAB library which seeks to count and label the connected nonzero/nonblack components in an image or integer vector, matrix or 3D block.

Licensing:

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

Languages:

IMAGE_COMPONENTS is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

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

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

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, a MATLAB function which creates a grayscale version of an RGB image.

IMAGE_THRESHOLD, a MATLAB library which creates a black and white version of a grayscale image by specifying a single threshold value; pixels below this value become black, and above this value they are white.

REGION, a FORTRAN90 library which reads 3D MRI voxel data, and groups the voxels into connected regions;

Reference:

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

• Jonas Gomes, Luiz Velho,
  Image Processing for Computer Graphics,
  Springer, 1997,
  ISBN: 0387948546,
  LC: T385.G65.
• William Pratt,
  Digital Image Processing,
  Second Edition,
  Wiley, 1991,
  ISBN13: 978-0471857662,
  LC: TA1632.P7.

Source Code:

• i4block_components.m, returns the components of a 3D integer block or image.
• i4mat_components.m, returns the components of a 2D integer array or image.
• i4vec_components.m, returns the components of a 1D integer vector or image.
• timestamp.m, returns the YMDHMS date as a timestamp.

Examples and Tests:

• components_test.m, a sample calling program.
• components_test01.m, tests I4VEC_COMPONENTS.
• components_test02.m, tests I4MAT_COMPONENTS.
• components_test03.m, tests I4BLOCK_COMPONENTS.
• indices.txt, 1099 3D indices used for the I4BLOCK_COMPONENTS test.
• components_test_output.txt, the output file.

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