Is it possible to combine Retinex and Histogram Equalization Methode?

Hey Guys, im new to the game and i want to ask if it's possible to combine 2 methods (Retinex and Histogram Equalization)? i would appreciate anyone who willing to give me a little explanation and codes. i have been trying to find it anywhere and without a success. I hope anyone could help me to find and solve this problem.

Thank you!

[DGM]

In what way to what end?

[Jamie]

actually i have no clue

Answer 1

[Arnav]

Hi Jamie,

I understand that you want to combine Retinex Method with Histogram Equalization to process images.

The overview of the procedure is shown below:

The Image is processed by MSR (multiscale retinex) and HE (histogram equalization) separately and then combined using high and low pass filters respectively. The essential equation is:

Where IDCT and DCT are inverse discrete cosine transform and discrete cosine transform respectively. This can be done in MATLAB using idct2 and dct2 functions.

HE can be used in a straightforward manner using histeq function in MATLAB.

To use MSR, Illumination can be calculated by applying gaussian filters using imgaussfilt of different scales and then taking a weighted average.

You may refer to the paper for the same:

https://www.mdpi.com/2079-9292/12/4/990

Additionally, refer to the following documentation links for more details about the functions suggested:

• imgaussfilt: https://www.mathworks.com/help/images/ref/imgaussfilt.html
• idct2: https://www.mathworks.com/help/images/ref/idct2.html
• dct2: https://www.mathworks.com/help/images/ref/dct2.html
• histeq: https://www.mathworks.com/help/images/ref/histeq.html

Hope it helps!