Photographic subject tracking device and camera
First Claim
1. A photographic subject tracking device, comprising:
- a memory that stores instructions; and
a processor that executes the instructions stored in the memory to;
set a search area in an input image;
calculate a first degree of similarity between a template image for tracking and an image in the search area;
identify a tracked photographic subject position in the input image based on the first degree of similarity;
calculate a second degree of similarity between each of multiple template images for resizing determination, which are generated based on the template image for tracking, and the image in the search area;
identify matching positions of the multiple template images for resizing determination, respectively, in the input image based on second degrees of similarity; and
change an image size of the template image for tracking and the template images for resizing determination based on a density of the plurality of matching positions.
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Abstract
A photographic subject tracking device includes: a first degree-of-similarity calculation unit that calculates degree of similarity between a template image for tracking and an image in search area; a photographic subject position identification unit that identifies a tracked photographic subject position in the input image based on calculated degree of similarity; a second degree-of-similarity calculation unit that calculates a degree of similarity between each of multiple template images for resizing determination, which are generated based on template image for tracking, and image in search area; a matching position identification unit that identifies matching positions of the multiple template images for resizing determination, respectively, in the input image based on calculated degrees of similarity; and a size changing unit that changes an image size of template image for tracking and template images for resizing determination based on a density of the plurality of matching positions identified.
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Citations
11 Claims
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1. A photographic subject tracking device, comprising:
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a memory that stores instructions; and a processor that executes the instructions stored in the memory to; set a search area in an input image; calculate a first degree of similarity between a template image for tracking and an image in the search area; identify a tracked photographic subject position in the input image based on the first degree of similarity; calculate a second degree of similarity between each of multiple template images for resizing determination, which are generated based on the template image for tracking, and the image in the search area; identify matching positions of the multiple template images for resizing determination, respectively, in the input image based on second degrees of similarity; and change an image size of the template image for tracking and the template images for resizing determination based on a density of the plurality of matching positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11)
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9. A photographic subject tracking device comprising:
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a memory that stores instructions; and
a processor that executes the instructions stored in the memory to;a search area in an input image; calculate a degree of similarity between an initial template image and an image in the search area and a degree of similarity between a synthetic template image and the image in the search area; identify a tracked photographic subject position in the input image based on the degrees of similarity; judge whether or not to update the synthetic template image, based on the degrees of similarity; an image, which is obtained by synthesizing an image including the tracked photographic subject position in the input image with the initial template image, as a new synthetic template image when the processor determines to update the synthetic template image; calculate another degree of similarity between each of multiple template images for resizing determination and the image in the search area; identify matching positions of the multiple template images for resizing determination, respectively, in the input image based on the other degrees of similarity; judge whether or not to change an image size of the initial template image, the synthetic template image, and the template images for resizing determination, based on a density of the plurality of matching positions; and change the image size of the initial template image to a new image size when processor determines to change the image size; wherein when the processor determines to change the image size, the processor sets an image of the new image size, including the tracked photographic subject position in the input image, as a new updated synthetic template image, further divides the updated synthetic template image into a plurality of blocks, and sets images of the new image size, each including one of the blocks in the input image, as new updated template images for resizing determination.
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10. A photographic subject tracking device comprising:
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a memory that stores instructions; and a processor that executes the instructions stored in the memory to; track a specified photographic subject in an image based on a first template image; identify a position in the image based on a plurality of second template images, the plurality of second template images being generated based on the first template image, detect a change of a size of the specified photographic subject; and update the first template image based on a plurality of positions when the processor detects that the size of the specified photographic subject has changed by a predetermined amount or more.
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Specification