Adjusting intensity values of specific area

Greetings!

Being relatively new to Image Processing, I am stuck on how to proceed with a current quandary of mine.

As you can see, near the center of the image I've got two unwelcome areas of lower intensity. I need to find a way to bring them back to normal, to restore them to the same intensity as their surroundings.

Any answers would be greatly appreciated!

Answer 1

[Image Analyst]

You can convert to HSV colorspace using rgb2hsv() and then call adapthisteq() on the v channel, then go back to RGB with hsv2rgb().

rbImage = imread(filename);
hsv = rgb2hsv(rgbImage);
newv = adapthisteq(v,...............
hsv(:,:,3) = newv;
rgbImageNew = hsv2rgb(hsv);
imshow(rgbImageNew);

Or you can search the web for the algorithm that Adobe uses for their "shadows and highlights" filter, which also does a very good job.