Image quality evaluation device, terminal device, image quality evaluation system, image quality evaluation method and computer-readable recording medium for storing programs
First Claim
1. An image quality evaluation device for evaluating the quality of an image obtained by shooting a photographic subject including a square-wave-shaped periodic pattern that fluctuates periodically in one direction, wherein the image quality evaluation device includes:
- a Fourier transform unit that accomplishes a two-dimensional Fourier transform on the image to obtain two-dimensional spatial frequency spectrum components; and
an analysis unit that, among the two-dimensional spatial frequency spectrum components obtained by the Fourier transform unit, analyzes the resolution of the image on the basis of spectrum components relating to a first direction corresponding to the direction in which the periodic pattern periodically fluctuates, and analyzes the deterioration of the image on the basis of spectrum components relating to a second direction orthogonal to the first direction.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention evaluates the quality of an image shot by a terminal device in a state closer to that seen with the eye. A computer evaluates the quality of an image obtained by shooting a photographic subject including a periodic pattern that fluctuates periodically in one direction. A Fourier transform unit accomplishes a two-dimensional Fourier transform on the image to obtain two-dimensional spatial frequency spectrum components. An analysis unit analyzes the resolution of the image on the basis of spectrum components of spatial frequencies included in the periodic pattern, among the two-dimensional spatial frequency spectrum components obtained by the Fourier transform unit, and analyzes the deterioration of the image on the basis of spectrum components other than these.
5 Citations
13 Claims
-
1. An image quality evaluation device for evaluating the quality of an image obtained by shooting a photographic subject including a square-wave-shaped periodic pattern that fluctuates periodically in one direction, wherein the image quality evaluation device includes:
-
a Fourier transform unit that accomplishes a two-dimensional Fourier transform on the image to obtain two-dimensional spatial frequency spectrum components; and an analysis unit that, among the two-dimensional spatial frequency spectrum components obtained by the Fourier transform unit, analyzes the resolution of the image on the basis of spectrum components relating to a first direction corresponding to the direction in which the periodic pattern periodically fluctuates, and analyzes the deterioration of the image on the basis of spectrum components relating to a second direction orthogonal to the first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An image quality evaluation method for evaluating the quality of an image obtained by shooting a photographic subject including a square-wave-shaped periodic pattern that fluctuates periodically in one direction, wherein the image quality evaluation method includes:
-
a Fourier transform process that accomplishes a two-dimensional Fourier transform on the image to obtain two-dimensional spatial frequency spectrum components; and an analysis process that, among the two-dimensional spatial frequency spectrum components obtained in the Fourier transform process, analyzes the resolution of the image on the basis of the spectrum components relating to a first direction corresponding to the direction in which the periodic pattern periodically fluctuates, and analyzes the deterioration of the image on the basis of spectrum components relating to a second direction orthogonal to the first direction.
-
-
13. A non-transitory computer-readable recording medium for storing a program for evaluating the quality of an image obtained by shooting a photographic subject including a square-wave-shaped a periodic pattern that fluctuates periodically in one direction, this program causing a computer to function as:
-
a Fourier transform means that accomplishes a two-dimensional Fourier transform on the image to obtain two-dimensional spatial frequency spectrum components; and an analysis means that, among the two-dimensional spatial frequency spectrum components obtained by the Fourier transform means, analyzes the resolution of the image on the basis of spectrum components relating to a first direction corresponding to the direction in which the periodic pattern periodically fluctuates, and analyzes the deterioration of the image on the basis of spectrum components relating to a second direction orthogonal to the first direction.
-
Specification