How to calculate the median and mode of an image from the histogram

I have used the following code to calculate the mode

[pixelCount grayLevels] = imhist(LBP_Im);
 maximum=max(pixelCount);
 r=find(pixelCount==maximum);

whether this is correct to calculate the mode. Likewise I wish to know the code for calculating the median of an image

Answer 1

[Guillaume]

Why not simply use the mode and median function?

imgmode = mode(LBP_Im(:));
imgmedian = median(LBP_Im(:));

[omar abbas]

THIS DOES NOT WORK FOR ME