Histogram-of-a-image-and-its-heatmap

A histogram of an image provides valuable insights into the distribution of pixel intensities within that image. This notebook gives a brief about how to plot the histogram. Furtherly, we can replot the picture with a heatmap based on its pixel intensities.

Raw picture:

Histogram:

Divide the image into sub-regions:

Heat map based on the mean pixel values of the sub-regions: