Focus evaluation value generation apparatus, focus evaluation value generation method, and computer-readable medium storing focus evaluation value generation program
AssigneeSocionext Inc.
InventorHiroshi Iwabuchi
Life of this patent
Estimating the term…
Abstract
A focus evaluation value generation apparatus includes a low frequency image data generation unit configured to generate low frequency image data, a thinned image generation unit configured to generate thinned input image data and thinned low frequency image data, and a focus evaluation value generation unit configured to generate the focus evaluation value based on the thinned input image data and the thinned low frequency image data.
Claims13
A focus evaluation value generation apparatus that generates a focus evaluation value that indicates a focusing degree of an optical system of a digital imaging apparatus, the focus evaluation value generation apparatus comprising:
- a low frequency image data generator configured to generate low frequency image data that is obtained by extracting a low frequency component from input image data that is obtained by imaging a subject;
- a thinned image generator configured to generate thinned input image data of which a number of pixels is smaller than the image data by thinning out a plurality of pixels of the input image data at a rate, and thinned low frequency image data of which a number of pixels is smaller than the low frequency image data by thinning out a plurality of pixels of the low frequency image data at the rate which is same as the rate of the generating of the thinned input image data;
- and
- a focus evaluation value generator configured to generate the focus evaluation value based on a difference value between a pixel of the thinned input image data and a pixel of the thinned low frequency image data.
A focus evaluation value generation method that generates a focus evaluation value that indicates a focusing degree of an optical system of a digital imaging apparatus, the focus evaluation value generation method comprising:
- generating low frequency image data that is obtained by extracting a low frequency component from input image data that is obtained by imaging a subject;
- generating thinned input image data of which a number of pixels is smaller than the image data by thinning out a plurality of pixels of the input image data at a rate, and thinned low frequency image data of which a number of pixels is smaller than the low frequency image data by thinning out a plurality of pixels of the low frequency image data at the rate which is same as the rate of the generating of the thinned input image data;
- and
- generating the focus evaluation value based on a difference value between a pixel of the thinned input image data and a pixel of the thinned low frequency image data.
A non-transitory computer-readable medium storing a focus evaluation value generation program that causes a computer to execute a focus evaluation value generation processing of generating a focus evaluation value that indicates a focusing degree of an optical system of a digital imaging apparatus, the focus evaluation value generation processing comprising:
- generating a focus evaluation value based on a difference value between a pixel of thinned input image data that generated by thinning out a plurality of pixels of input image data at a rate, and a pixel of thinned low frequency image data by thinning out a plurality of pixels of low frequency image data at the rate which is same as the rate of the generating of the thinned input image data, the input image data being obtained by imaging a subject, the low frequency image data being generated by extracting a low frequency component from the input image data.
Dependencies are inferred from the claim text.