Basically I need to store (in a database) and subsequently fast compare histograms of two images.
Let's say I have an image and the green histograms is:
Where basically I have 4 buckects, and green pixel from 0 to 63 are 15 and so on.
How could I condense this graph in a numeric value so I can easly compare it to a new image?
The most simple solution is to create a string like this:
22.214.171.124 ^ ^ >--|--------number of pixel from 0-64 >--------number of pixel from 64-127 (and so on)
The problem with this solution is that i can't easly compare 2 images with similar value. Let's say I have another images with the green histogram is:
126.96.36.199 ^ > 14 pixel instead of 15
This new image is basically the same with just 1 pixel less of 0-63 range. But I can't easly compare this 2 strings