Signal Processing

Questions tagged [pixel-wise-operation]

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How to calculate variance of noise on a noisy image (Noise+Signal)

I have a long exposure image captured at 70ms. (I1) (As attached) I also have another image captured at 0.7ms with Gain24. (I2) (As attached) This image has both noise and signal together. I would ...
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Pixel Binning: Effect on SNR for Hardware vs. Software Binning

Is there a difference in SNR (or any other measure of image quality) between using 2x2 pixel binning in the camera and shrinking the full resolution image in software (cv::INTER_AREA) to the same size ...
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Array bounds check o(1) (Integral image?)

Not sure if this is the correct place to ask but I have a question about techniques for processing an array of pixels with o(1) complexity. That is to get the sum of a subset of an array but if this ...
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Localized Gamma Correction

Question: Is there an algorithm that does (what I would call) "localized" gamma correction? That is, applying different gamma corrections on different parts of an image, using a masking filter or ...
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Non Linear Remapping of the Pixel Values

Suppose you take a photo of a beautiful scene of mountains and a lake. The representation devotes half of the scale between black and white to the bright surface of the lake, and the other half to the ...