Error in blockproc function

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Naeem Shaikh
Naeem Shaikh 2015-8-27
whenever i use blockproc function in matlab it gives error as Undefined variable "internal" or class "internal.images.IOContainer". Error in blockproc (line 186) a = internal.images.IOContainer(a,'r');
i have tried all the possible combinations for blockproc, even a simple anonymous function handle could also produce error of the same type. plz help me come out of this. i'm also providing the code where i have to use blockproc
R = double(rgbImage(:,:,1)); B = double(rgbImage(:,:,3)); G = double(rgbImage(:,:,2)); I = (76.245 * R + 19.685 * G + 29.071 * B) / 255;
In = I / 255; % normalize to the range [0 1]
LumEnh = @(block_struct) histeq(block_struct.data);
% LumEnh = @(block_struct)IntensityCDF(block_struct.data);
L = blockproc(In,[3,3], LumEnh);

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