Image comparison system and method

An image comparison system comprising:

• a processor;
• and
• a memory, said memory having stored thereon instructions which when run by said processor cause said processor to:
• receive a first image and a second image;
• point match said first image with said second image to identify tentatively corresponding points in said first and second images;
• responsive to said identified points, define a plurality of first image tiles within said received first image;
• responsive to said identified points, define a plurality of second image tiles within said received second image, each of said plurality of second image tiles corresponding to a respective one of said plurality of first image tiles;
• for each of said first image tiles and second image tiles, adjust the intensity of each of a set of pixels responsive to the cumulative relative frequency of the intensity level of said respective pixel within said respective tile;
• for each of said intensity adjusted image tiles, apply a plurality of non-linear functions to said respective image tile;
• for each of said applied non-linear functions, separately determine a moment of the outcome of said respective non-linear function for each of a plurality of pixel coordinate axes of said respective image tiles thereby defining a plurality of vectors, each of said plurality of vectors defined by said determined moments for a respective one of said plurality of pixel coordinate axes;
• for each of said first image tiles, determine a distance between a subspace which is spanned by said defined vectors of said respective first image tile and a subspace which is spanned by said defined vectors of said corresponding second image tile;
• for each of said first image tiles, responsive to said determined distances and a distance rule, determine whether said respective first image tile and its corresponding second image tile comprise observations of the same portion;
• and
• output an indication of said portions determination.

An image comparison system comprising:

• a communication module, said communication module arranged to receive a first image and a second image;
• a point matching module, said point matching module arranged to point match said first image with said second image to identify tentatively corresponding points in said first and second images;
• a tile module, said tile module arranged, responsive to said identified points, to:
• define a plurality of first image tiles within said received first image, and
• define a plurality of second image tiles within said received second image, each of said plurality of second image tiles corresponding to a respective one of said plurality of first image tiles;
• an intensity adjustment module, said intensity adjustment module arranged, for each of said first image tiles and second image tiles, to adjust the intensity of each of a set of pixels responsive to the cumulative relative frequency of the intensity level of said respective pixel within said respective tile;
• a non-linear function module, said non-linear function module arranged, for each of said intensity adjusted image tiles, to apply a plurality of non-linear functions to said respective image tile;
• a moment module, said moment module arranged, for each of said applied non-linear functions, to separately determine a moment of the outcome of said respective non-linear function for each of a plurality of pixel coordinate axes of said respective image tiles thereby defining a plurality of vectors, each of said plurality of vectors defined by said determined moments for a respective one of said plurality of pixel coordinate axes;
• a distance module, said distance module arranged, for each of said first image tiles, to determine a distance between a subspace which is spanned by said defined vectors of said respective first image tile and a subspace which is spanned by said defined vectors of said corresponding second image tile;
• an object observation module, said object observation module arranged, for each of said first image tiles, responsive to said determined distances and a distance rule, to determine whether said respective first image tile and its corresponding second image tile comprise observations of the same portion;
• and
• an output module, said output module arranged to output an indication of said portions determination.