how to get image average

hello to all

i have an 4-D dimension Array that contain some RGB picture and i want to set an image that each pixel of it is average of other corresponding pixel in all picture.i wrote below code but doesn't work correctly.

if any one know the correct solution please help me

best regards

if true

clc;

obj=mmreader('street.avi');

Frames = obj.NumberOfFrames;

vidHeight = obj.Height;

vidWidth = obj.Width;

a=read(obj);

im = a(:,:,:,8);

sum = uint16(0);

imframe =(zeros(vidHeight,vidWidth,3));

imframe1=uint16(zeros(vidHeight,vidWidth,3,Frames));

imframe2=uint16(zeros(vidHeight,vidWidth,3));

for p = 1:250
    imframe1(:,:,:,p)=(im2uint16(a(:,:,:,p))); %sum = sum + uint16(a(m,n,k,p));
 end

for p = 1:250
    imframe2=imadd(imframe1(:,:,:,p),imframe2);
 end

Answer 1

[Walter Roberson]

Replace nearly all your code with

mean(a,4)

You might need

mean(double(a),4)

Answer 2

[mohammadali]

thank you for response if it possible explain it briefly good luck