Scan image row-wise and store index of minimum grey values.

Hi, I want to scan an image row-wise and store the index value of the concerned pixels (Ones with lowest grey values) in a matrix (note:There can be more than one pixel with such values). Currently I can scan a row at a time and it returns index of the first pixel which has lowest intensity value. Image size is 478 by 680. AND I am getting wrong index values.

I = imread('5.bmp');
I = im2gray(I);
imshow (I);
i=1:1:478;
[min_intensity,idx]= min(I(i,:));
idx = idx;

Answer 1

[Matt J]

I = imread('5.bmp');
I = im2gray(I);

min_intensity= min(I,[],2);

[row,col]=find(I==min_intensity); %indices of minimum

[SATISH SONWANE]

Thank you @Matt J. Solutions are often simpler than they seem.