How to find the pixel value of the center pixel and the maximum pixel value difference of the image?

I want to extract a couple of properties from an image, They are:

1) Pixel value of the center pixel

2) Maximum pixel value difference of the image.

I tried impixel for the first part but I don't get any value. Any suggestions would be appreciated. Thank you.

Answer 1

[Image Analyst]

Try this

[rows, columns, numberOfColorChannels] = size(yourImage);
% Find location of the center pixel.
middleRow = round(rows/2);
middleColumn = round(columns/2);
% Get its gray level.
centerPixelValue = yourImage(middleRow, middleColumn, :)

To get the max pixel value difference over the whole image do

maxGrayLevelRange = range(yourImage, 'all')

[Warid Islam]

Thank you. It worked