How to crop the circular ROI (already done) from the image ? I want to eliminate the black background for calculating average RGB values, so that i can calculate average luminance from the image.

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veena mathew 2021-2-12

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评论： Omer Akatekin 2021-3-22

testfile.jpg

clear all

clc

hdr=hdrread('testfile.hdr');

rgb=tonemap(hdr);

figure;

imshow(rgb)

roi = drawcircle('Center',[400 400],'Radius',398);

BW=createMask(roi);

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Omer Akatekin 2021-3-22

Are you doing for tunnel lighting access zone calculation ? because it seems to what i am trying to design app for these nowadays

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Abhishek Gupta 2021-2-15

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Hi,

Referring to the following MATLAB Answer, which might help you in resolving the issue: -

Average pixel values of several ROIs

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Image Processing and Computer Vision Image Processing Toolbox Image Filtering and Enhancement ROI-Based Processing

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