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US 2001/0028741 A1Published application
Method and a device for matching images
AssigneeC Technologies AB
InventorsCHRISTER FAHRAEUS, OLA HUGOSSON, PETTER ERICSON
Life of this patent
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AssigneeC Technologies AB
InventorsCHRISTER FAHRAEUS, OLA HUGOSSON, PETTER ERICSON
Estimating the term…
In a method for matching two images, each consisting of a plurality of pixels and having partially overlapping contents, the degree of correspondence between the contents of the images is determined for different displacement positions representing different overlappings of the images. More specifically, a plurality of numbers are determined for each one of a plurality of said displacement positions. Each number is formed with the aid of pixel values from both images and is used to simultaneously retrieve predefined overlap assessment values for at least two of said displacement positions. The overlap assessment values retrieved are subsequently used to determine the degree of correspondence between the images for the different displacement positions. The method is carried out with the aid of a computer and can be implemented as a computer program.
A method for matching two images, each consisting of a plurality of pixels and having partially overlapping contents, the degree of correspondence between the contents of the images being determined for different displacement positions which represent different overlappings of the images, comprising the following steps:
A method according to any one of the preceding claims, wherein some of the overlap assessment values relate to more than one overlapping pixel.
A method according to any one of the preceding claims, wherein the images consist of bitmaps.
A method according to any one of the preceding claims, wherein the numbers constitute addresses of memory locations, which store said overlap assessment values consisting of pre-calculated values.
A method according to any one of the preceding claims, further comprising the step of forming each number of a first fine segment, which comprises at least two adjoining pixel values from the first image, and of a second fine segment, which overlaps the first fine segment and which comprises as many adjoining pixel values as the first fine segment from the second image, and of a third fine segment, which comprises as many adjoining pixel values as the first fine segment from the second image and which overlaps the first fine segment in an adjacent displacement position, for which the determination of a plurality of numbers is carried out.
A method according to any one of the preceding claims, wherein the degree of correspondence between the images is first determined with a first resolution of the images for selection of a plurality of displacement positions, and is subsequently determined with a second, higher resolution of the images for the displacement positions selected and adjoining displacement positions.
Dependencies are inferred from the claim text.