Method and system for detecting staining

A method for detecting staining on a media item, the method comprising:

• capturing a digital image of the media item, the digital image comprising a plurality of pixels representing colour information of the media item;
• comparing the captured digital image to a reference image, wherein comparing the captured digital image to the reference image comprises:
• determining the nature of the media item;
• retrieving a corresponding reference image from a database;
• generating a histogram for each of a plurality of kernel patches of the captured digital image, wherein each of the plurality of kernel patches of the captured digital image covers an area of the captured digital image, such that the entire captured digital image is covered by the plurality of kernel patches;
• comparing the histogram for each of the plurality of kernel patches of the captured digital image to a histogram of a corresponding kernel patch of the reference image to generate a distance metric;
• and
• based on the generated distance metrics, determining if staining is present on the media item.