how compute the pixel sum for image?

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houssem rouine
houssem rouine 2018-4-11
评论： Walter Roberson 2019-10-28
Hello freinds, I am a beginner in matlab and i want know how compute the pixel sum for image
  2 个评论
Adam
Adam 2018-4-11
What is wrong with
doc sum
?! Even as a beginner it is surely the most obvious place to look.
You do need to collapse the image to 1d though or use a double sum, e.g.
pixelSum = sum( myImage(:) );
houssem rouine
houssem rouine 2018-4-11
thank you so much for your helping.

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回答（1 个）

Pawel Jastrzebski
Pawel Jastrzebski 2018-4-11
  1. Use imread - output to load the image into Matlab and store it as a matrix - it can be anything between 2d and 4D matrix
  2. Dimension 1 and 2 of the matrix are width and height of the image in pixels
% load the image into the matrix
A = imread('http://www.matlabtips.com/wp-content/uploads/2014/07/64848_wl_cc_logo_membrane_2002_wl.gif');
dims = size(A)
NoOfPixels = prod(dims)
% Note if 'dims' is bigger than 2 elements then:
% NoOfPixels = prod(dims(1:2))
  2 个评论
Fhynthiazien Bobby
Fhynthiazien Bobby 2019-10-28
Hi, i tried using the code and my output is as below:
dims =
531 614 3
NoOfPixels =
978102
Therefore sir, does the value 978102 represents the overall sum of pixel for the image??
Walter Roberson
Walter Roberson 2019-10-28
No, in that code, NoOfPixels is the number of array elements in the image. It is not necessarily the number of pixels: the number of pixels would be dims(1)*dims(2) . The difference comes about for RGB, in which there are 3 array elements per pixel.
If you are looking for the sum of the pixels, you need to define what that means for RGB.
sum(A, [1 2]) %since R2019a

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