Needing to get the coordinates of the illuminated pixels

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Antonio Cebrián
Antonio Cebrián 2017-4-5
编辑： Antonio Cebrián 2017-4-6
Hi, I'm trying to get the coordinates of the pixels in the lit area of greyImg. Is this possible?
RGB=imread('image_0.png');
greyImg = rgb2gray(RGB);

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回答（2 个）

Thorsten
Thorsten 2017-4-5
You can define a threshold by visual inspection to separate the lit from the unlit pixels to get a binary image.
mythreshold = 0.55;
BW = im2bw(I, mythreshold);
idx = BW == 1; % logical index
idx = find(BW); % numerical index
Antonio Cebrián
Antonio Cebrián 2017-4-6
sorry but it doesn't work. I have got an empty matrix

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