Method for automatically comparing content of images for classification into events
AssigneeEastman Kodak Company
InventorsAlexander C. Loui, Eric S. Pavie
Life of this patent
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Abstract
A method for comparing image content of first and second images, the method comprises the steps of extracting a portion of both the first and second images both of which portions are determined to include a main subject area of each image; dividing the main subject area of the images into a plurality of blocks; computing a color histogram for one block in each image; computing a histogram intersection value between the block of the first image and the block of the second image; and determining a first threshold value for the computed histogram intersection value that determines similarity between the block in the first image and the block in the second image.
Claims18
A method for comparing image content of first and second images, the method comprising the steps of:
- (a) extracting a portion of both the first and second images both of which portions are determined to include a main subject area of each image;
- (b) dividing the main subject area of the images into a plurality of blocks;
- (c) computing a color histogram for one block in each image;
- (d) computing a histogram intersection value between the block of the first image and the block of the second image;
- (e) determining a first threshold value for the computed histogram intersection value that determines similarity between the block in the first image and the block in the second image;
- and
- (f) shifting the first image in a predetermined direction if there is not a similarity between the first and second images and redetermining the similarity between the images in step (c)-(e) for blocks that are shifted with respect to each other.
A computer program product for comparing image content of first and second images comprising:
- a computer readable storage medium having a computer program stored thereon for performing the steps of:
- (a) extracting a portion of both the first and second images both of which portions are determined to include a main subject of each image;
- (b) dividing the main subject of the images into a plurality of blocks;
- (c) computing a color histogram for one block in each image;
- (d) computing a histogram intersection value between the block of the first image and the block of the second image;
- (e) determining a threshold value for the computed histogram intersection value that determines similarity between the block in the first image and the block in the second image;
- and
- (f) shifting the first image in a predetermined direction if there is not a similarity between the first and second images and redetermining the similarity between the images in step (c)-(e) for blocks that are shifted with respect to each other.
A method for comparing image content of first and second images, the method comprising the steps of:
- (a) extracting a portion of both the first and second images both of which portions are determined to include a main subject area of each image;
- (b) dividing the main subject area of the images into a plurality of blocks;
- (c) computing a color histogram for each of the plurality of blocks in each image;
- (d) computing a histogram intersection value between one block in the first image and two or more blocks in the second image;
- and,
- (e) determining a first threshold value for the computed histogram intersection value that determines similarity between the block in the first image and the blocks in the second image.
A method for comparing image content of first and second images, the method comprising the steps of:
- (a) dividing the first and second images into three portions and using a middle portion of the three portions as a main subject area of each image;
- (b) dividing the main subject area of the images into a plurality of blocks;
- (c) computing a color histogram for one block in each image;
- (d) computing a histogram intersection value between the block in the first image and the block in the second image;
- and
- (e) determining a first threshold value for the computed histogram intersection value that determines similarity between the block in the first image and the block in the second image.
Dependencies are inferred from the claim text.