Chapter 4 - Proposed Approach - Chapter 4 PROPOSED APPROACH...

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Chapter 4 PROPOSED APPROACH 1. An ideal CCD sensor should exhibit linear response from the lowest detectable light level to the maximum well depth. 2. In order to estimate readout noise from real case images, we plot the mean versus standard deviation of different sub-regions having minimum variation, of an image and a straight line fit is obtained which represents linearity then y-intercept is taken as readout noise which is the standard deviation at zero mean intensity. 3. Extract sub-regions from each image : This is a crucial step for accurate determination of readout noise. 4. Plot a set of mean versus standard deviation and estimate readout noise: A scatter plot is drawn for a set of mean (Im) versus standard deviation (Isd) which are computed in the previous step for each image or a set of images. 5. A straight line fit is obtained by robust regression method using robustfit function available in MATLAB and then y-intercept is taken as readout noise in ADU.
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