MATLAB: About brightness

brightness

[EDIT: 20110523 17:15 CDT – reformat. clarify – WDR]

Hello everyone, I have a trouble with the brightness in a pic that I take:

http://i55.tinypic.com/2s1kt2g.jpg

I'm new in Matlab anyone can help me please? I need to remove the brightness in the edges, then to binarize just to see the white points, the picture is of bacterial colonies. Thanks!

PS: sorry for my bad English.

Best Answer

I suggest im2bw perhaps in combination with graythresh

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brightness = mean2(myImage);

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You are probably looking for the imadjust command. As you can see in the documentation the basic syntax for imadjust is

OutputImage = imadjust(InputImage,[low_in; high_in],[low_out; high_out])

where low_in,high_in,low_out and high_out are between 0 and 1. Hence you could assign predetermined values to those and run imadjust on your images. There also a gamma parameter which you can add in you call to imadjust. This factor is used to enhance in a non-linear fashion low or high intensity signals. More info here

If you have the Image Processing Toolbox take a look at the Image Viewer App

Hope that helps get you started!

Best Answer

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MATLAB: Average brightness of image

MATLAB: Adjust brightness and contrast

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