Method and apparatus for detecting and processing specific pattern from image
AssigneeCanon Kabushiki Kaisha
InventorsKan Torii, Masakazu Matsugu, Katsuhiko Mori, Hiroshi Sato, Yusuke Mitarai
Life of this patent
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Abstract
In an image within which a face pattern is detected, when a ratio of a skin color pixel is equal to or smaller than a first threshold value in a first region and a ratio of a skin color pixel is equal to or greater than a second threshold value in a second r region, the vicinity of the first region is determined to be a face candidate position at which the face pattern can exist. Face detection is carried out on the face candidate position. The second region is arranged in a predetermined position relative to the first region.
Claims17
A method comprising:
- determining a ratio of pixels having a first attribute in a first region of an image to generate a first determination result;
- determining a ratio of pixels having a second attribute in a second region of the image to generate a second determination result, wherein the second region is arranged inside the first region, and the first and second regions are rotationally symmetric figures having coincident centers;
- determining whether human face images can exist in the vicinity of the first region based on the first determination result and the second determination result;
- and
- detecting a human face image in the vicinity of the first region when it is determined that the human face image can exist.
A method comprising:
- determining a ratio of pixels having a predetermined attribute within each figure with respect to one or more figures that include a rotationally symmetric figure in an image;
- determining whether human face images can exist in the vicinity of the figure, based on a result of the ratio determination;
- and
- detecting a human face image and an image obtained by rotating the human face image in a portion of the image where it is determined that the human face image can exist.
An apparatus comprising:
- a first ratio determination unit configured to determine a ratio of pixels having a first attribute in a first region of an image;
- a second ratio determination unit configured to determine a ratio of pixels having a second attribute in a second region of the image that is arranged inside the first region, and the first and second regions are rotationally symmetric figures having coincident centers;
- a determination unit configured to determine whether human face images can exist in the vicinity of the first region based on determination results of the first and second ratio determination units;
- and
- a detection unit configured to detect a human face image in the vicinity of the first region when it is determined that the human face image can exist.
An apparatus comprising:
- a ratio determination unit configured to determine a ratio of pixels having a predetermined attribute within each figure with respect to one or more figures that include a rotationally symmetric figure in an image;
- a determination unit configured to determine whether human face images can exist in the vicinity of the figure based on a result of the ratio determination;
- and
- a detection unit configured to detect a human face image and an image obtained by rotating the human face image in a portion of the image where it is determined that the human face image can exist.
Dependencies are inferred from the claim text.