Detecting compositional change in image
First Claim
1. A method of detecting a compositional change in an image, comprising:
- obtaining an electrical signal corresponding to an illuminance of the image formed by a focusing lens using a photoelectric detector;
dividing the image into a plurality of subdivision areas;
calculating, for each of the subdivision areas, a focus evaluation value representative of an amount of high frequency component contained in the electrical signal and a brightness value representative of a brightness of the image;
storing as reference values a focus evaluation value and a brightness value of the image in focus;
sorting the subdivision areas according to an object distance classification;
weighting with different weights the subdivision areas in classes of the object distance classification based on a main subdivision area to which a main object belongs;
comparing the focus evaluation and brightness values after a focus with the reference values so as to calculate variation in the focus evaluation and brightness values; and
detecting compositional changes based on the weights as well as the variation in the focus evaluation and brightness values.
4 Assignments
0 Petitions
Accused Products
Abstract
A method obtains an electrical signal from the photoelectric detector, which signal corresponds to the illumination of the image formed by the focusing lens. The image screen is divided into a plurality of subdivision areas. The method then calculates for the respective subdivision areas a focus evaluation value representative of a high frequency component contained in the electrical signal and a brightness value representative of a brightness of the image. The subdivision areas are sorted in accordance with a object distance classification. The method weights with different weights the subdivision areas on the basis of the subdivision area to which a main object belongs. Variations in the focus evaluation and brightness values are calculated by comparing the values after a focus and the values for an in-focus image. Compositional changes are detected based on the weights and the variation in the focus evaluation and brightness values.
68 Citations
10 Claims
-
1. A method of detecting a compositional change in an image, comprising:
-
obtaining an electrical signal corresponding to an illuminance of the image formed by a focusing lens using a photoelectric detector; dividing the image into a plurality of subdivision areas; calculating, for each of the subdivision areas, a focus evaluation value representative of an amount of high frequency component contained in the electrical signal and a brightness value representative of a brightness of the image; storing as reference values a focus evaluation value and a brightness value of the image in focus; sorting the subdivision areas according to an object distance classification; weighting with different weights the subdivision areas in classes of the object distance classification based on a main subdivision area to which a main object belongs; comparing the focus evaluation and brightness values after a focus with the reference values so as to calculate variation in the focus evaluation and brightness values; and detecting compositional changes based on the weights as well as the variation in the focus evaluation and brightness values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification