Averaging histograms

An image histogram is the number of each pixel value, which is displayed in the graph.

x axis of the graph is pixel value, range from 0 to 255;

y axis of the graph is the number of this pixel value;

1.How to averaging histograms?

Our goal is to generate a new image with a more even histogram distribution.

Some notes on Convolution course

What is padding?

Padding is to add some pixels to the border of the original image, such as a 6*6 image will become a 8*8 image if we add a pixel to its border.

valid convolution vs same convolution.

Valid convolution is on padding that means the actual pixels of the output image after we convole original image with filter.

Same convolution means adding padding so that the output image has the same size as its input image.