2. 3/4/2024 Department of Biomedical Engineering, SRMIST, KTR 2
For a given image a gray level run is defined as a set of consecutive, collinear
pixels having the same gray level.
Runlength of the run is the number of pixels that has same intensity in the run
of particular direction.
The run-length matrix p (i, j) is defined by specifying direction and then count
the occurrence of runs for each gray levels and length in this direction.
Grey level run length matrix (RLM) features
3. 3/4/2024 Department of Biomedical Engineering, SRMIST, KTR 3
Grey level run length matrix (RLM) features
4. 3/4/2024 Department of Biomedical Engineering, SRMIST, KTR 4
Laws’ Texture Energy Features
• Signal-processing-based algorithms use texture filters
applied to the image to create filtered images from which
texture features are computed.
• The Laws Algorithm filter the input image using texture filters.
• Compute texture energy by summing the absolute value of
filtering results in local neighborhoods around each pixel.
• Combine features to achieve rotational invariance.
5. 3/4/2024 Department of Biomedical Engineering, SRMIST, KTR 5
Laws’ Texture Energy Features
