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MATLAB sum of pixel between 0 and 100 intensity

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Muhammad Akmal Mohd Halim
回答： KSSV 2020-6-20
Hello. I trying to generate an image into histogram and in that image i have to calculate the sum of pixels. Then after that i have to change it to grayscale but how do i calculate sum of pixel between 0 and 100 intensity of the grayscale image? I tried adding the code y=(x<=100) but the value suddenly change to binary.
ths is my code
clc;
clear;
I=imread('image.jpg');
imhist(I);
pixelCounts=imhist(I);
numberOfPixels = sum(pixelCounts)
x=rgb2gray(I);
y=(x<=100)

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回答（1 个）

KSSV
KSSV 2020-6-20
If I is your image.
idx = I >= 0 & I <= 100 ; % this gives logical indices of the pixels present
N1 = nnz(idx(:)) ; % this gives total
N2 = sum(idx(:)) ; % this gives total

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