how to get a uniform illumination?

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amir
amir el 16 de Feb. de 2016
Comentada: Image Analyst el 24 de Feb. de 2016
hello, i am trying to do a face detection based on skin colour and i was trying to make a uniform illumination for the images acquired through the webcam. How can I do this with help of HSV adjustments?

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Image Analyst
Image Analyst el 16 de Feb. de 2016
Illumination cannot be changed by software. You need things like lamps and diffusers. Simply converting to HSV or LAB color space and making the V or L channel (respectively) a uniform value does not have the same effect. Below is an image where I made the left half have the same Y value (like L or V). You can see the effect. If you would have had a non-uniform illumination, it would not flatten the image. You'd need to do background division for that.
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amir
amir el 24 de Feb. de 2016
Editada: amir el 24 de Feb. de 2016
I have tried with color thresholder but the image is so noisy in the face area. Since I am going to do this method for real time processing, the result would not be stable since i have tried it with different photos. There is anyway I can overcome this problem?
Image Analyst
Image Analyst el 24 de Feb. de 2016
Try to do some noise reduction. For example average video frame together, or use some denoising algorithm.

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