How to get image brightness ?
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Hi everyone! I am new to MATLAB Image Processing and I need your help. I need to build a code that calculates this instantaneous apparent brightness m_inst, related to the straight line in figure. The exposure time of the frame that I have attached here is one second. Can anyone help me?
I have worked on a code like this to obtain the brightness of the pixels belonging to that straight line but I don't know if it is useful for the calculation of apparent brightness:
A=rgb2gray(imread('Img_0685.bmp'));
B=bwareafilt(imbinarize(A-medfilt2(A,[5,5])) ,1) ;
pixelValues=A(B)
figure
imshow(B)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/766531/image.jpeg)
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yanqi liu
am 14 Okt. 2021
clc; clear all; close all;
A=rgb2gray(imread('https://ww2.mathworks.cn/matlabcentral/answers/uploaded_files/766496/Img_0685.bmp'));
B=bwareafilt(imbinarize(A-medfilt2(A,[5,5])) ,1) ;
res=mean2(double(A(B)))
figure
imshow(B)
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yanqi liu
am 14 Okt. 2021
clc; clear all; close all;
A=rgb2gray(imread('https://ww2.mathworks.cn/matlabcentral/answers/uploaded_files/766496/Img_0685.bmp'));
B=bwareafilt(imbinarize(A-medfilt2(A,[5,5])) ,1) ;
C=A.*uint8(B);
ci = unique(C(:));
ci_sum = 0;
for i = 1 : length(ci)
if ci(i) > 0
ci_num = length(find(C(:)==ci(i)));
ci_sum = ci_sum + ci_num;
end
end
n = length(find(C(:)>0));
csky = length(find(C(:)==0));
t = 1;
minist = 30 - 2.5*log10((ci_sum-n*csky)/t)
figure
imshow(C)
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