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im2dhisteq
This module attempts to enhance contrast of a given image by equalizing its two dimensional histogram.
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imhblpce
This module attempts to enhance contrast of a given image by employing a method called HBLPCE.
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InfluxDB
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Code is here: Two Dimensional Image Contrast Enhancement
Regarding the case of over-enhancement, I wrote another module that while enhancing contrast of the image, it keeps an eye on the histogram's general shape to prevent excessive enhancement. This method can be used for a more wide variety of images without any problem. You can access it here: imhblpce method.