Best way to match a auto part images in a database using C#

Can anyone recommend a method to compare an image taken from a web cam to images stored in a database and display the 开发者_Python百科ones that nearly match?

You might take a look at this SO question where several options are discussed about how to compare images. It would seem to me that a histogram approach might provide a quick comparison. Obviously it isn't perfect but it can reduce the candidate set down considerably.