CODEWITHSUNDEEP
matlabmatrixoctaveprecisionimread
whatwhatwhat
whatwhatwhat

Reputation: 2256

Why is my matrix not outputting the correct precision?

I need to take a very large matrix that is generated by using the function imread(). This turns an image (mine is a jpg file; 691x763) into a matrix.

I need to divide each element in the matrix by 255 and show each element with at least 3 decimal places.

What I've tried:

output_precision(4) but it didn't work for the elements inside the matrix.

format long e but the values inside the matrix were still unaffected.

Upvotes: 0

Views: 50

Answers (2)

Andy
Andy

Reputation: 8091

You should use im2double http://octave.sourceforge.net/image/function/im2double.html which does the scaling to 0..1 for you independently of the input format which might be uint, uint16, int16 and so on.

Upvotes: 2

Lincoln Cheng
Lincoln Cheng

Reputation: 2303

I'm guessing imread() gave you a matrix of uint8. Try this instead:

I = imread('image.jpg'); %// your image
A = double(I)/255; %//convert matrix to double before dividing it by 255

Upvotes: 1

Related Questions