how to get a uniform illumination?

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amir
amir 2016-2-16
评论： Image Analyst 2016-2-24
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 2016-2-16
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 2016-2-24
编辑：amir 2016-2-24
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 2016-2-24
Try to do some noise reduction. For example average video frame together, or use some denoising algorithm.

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