How can i plot combine bar histogram of four images in a single graph separated by different colors in mat lab.

I am working on a research topic based on Image processing and simulation work is based on Mat lab.
I have to make comparative study of image noise removing filters. I have applied different noise removing filters on different noisy images and then compute Signal to noise ratios and mean square errors of those filters. Finally I have to plot a single histogram graph of four to five filtered images which
Shows comparisons of noise removing filters. I am facing a lot of problems regarding a combine histogram of four to five images. Single histogram graph should display different images with different colors. So if anybody know then kindly share it with me...