" Local Otsu of a image passes through colfilt() " go through the code i'm getting error in this code

   function document_threshold()
iImage = imread('C:\Users\ChAnDrU\Documents\MATLAB\Test\1.jpg');
subplot(2, 2, 1);
imshow(iImage, []);title('Original Image');
[rows, columns, numberOfColorBands] = size(iImage);
if numberOfColorBands > 1
    grayImage = iImage(:, :, 2);
end
subplot(2, 2, 2);
imshow(grayImage, []);title('Gray Image');

fun = @(x) LocalOtsu(x); A = im2double(grayImage); localThresh = colfilt(A, [15, 15],'sliding', fun); subplot(2, 2, 3); imshow(localThresh, []);title('Local Otsu Image');

function oneThresholdedPixel = LocalOtsu(grayImagePatch) oneThresholdedPixel = false; try [rows, columns] = size(grayImagePatch); middleRow = ceil(rows/2); middleColumn = ceil(columns/2); level = graythresh(grayImagePatch); % Threshold the center pixel only. oneThresholdedPixel = ~im2bw(grayImagePatch(middleRow, middleColumn), level); catch ME errorMessage = sprintf('Error in function %s() at line %d.\n\nError Message:\n%s', ... ME.stack(1).name, ME.stack(1).line, ME.message); fprintf(1, '%s\n', errorMessage); uiwait(warndlg(errorMessage)); end return;

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