Pixel size = 5.45 um Gap size = 100 nm Spot size = 200 um Full well capacity = 10,500 electron how do i plot the COG of a spot imaged on a sensor with some photon noise

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daniel adegbeleji 2020-6-29

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评论： Image Analyst 2020-6-30

As a beginner in matlab programming how do I compute Pixel size = 6.45 um Gap size = 100 nm Spot size = 500 um Full well capacity = 10,300 electron to plot the COG of a spot imaged on a sensor with some photon noise

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Image Analyst 2020-6-29

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I don't see how any of those numbers matter. If you have a digitized image, you can just call regionprops

[rows, columns, numberOfColorChannels] = size(grayImage);
if numberOfColorChannels == 3
    grayImage = rgb2gray(grayImage);
end
mask = true(rows, columns);
props = regionprops(mask, grayImage, 'WeightedCentroid');
xCentroid = props.WeightedCentroid(1);
yCentroid = props.WeightedCentroid(2);

That's the weighted centroid of the whole image. If you want the centroid of only a portion where the spot is brighter than some value, you can make a mask for that.

mask = grayImage > someValue;

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daniel adegbeleji 2020-6-30

编辑：Image Analyst 2020-6-30

Yes sir, you are right. How do I go about the simulation? I don't know the blocks to put together. The spot will be moved across the sensor i.e from left to right.