Method of Evaluating Quality of Image and use Thereof
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsMasashi Ueda, Takuma Kuno
Life of this patent
Estimating the term…
Abstract
A method of evaluating the quality of an image includes a step of determining at least a parameter concerning a zone or a parameter concerning a distribution pattern of sampling points within the zone. This step is performed based on the image. For each zone, Fourier analysis is performed using the optical characteristic values of the respective sampling points within the zone, and the image quality of each zone is obtained. The quality of the image is then determined based on the image quality of each zone within the image. A suitable zone and distribution pattern of sampling points are employed in evaluating the quality of an image.
Claims13
A method of evaluating the quality of an image, comprising:
- determining at least a parameter concerning a zone or a parameter concerning a distribution pattern of sampling points within the zone according to the image;
- identifying data that indicates position and optical characteristic value of each of the sampling points within the zone which are determined at least partially based on the determined parameter;
- performing Fourier analysis on the identified data relevant to each zone to obtain an image quality of the zone;
- and
- determining the quality of the image on the basis of the image quality of each zone.
A device for assisting in evaluating the quality of an image, comprising:
- means for determining at least a parameter concerning a zone or a parameter concerning a distribution pattern of sampling points within the zone according to the image;
- means for identifying data that indicates position and optical characteristic value of each of the sampling points within the zone which are determined at least partially based on the determined parameter;
- means for performing Fourier analysis on the identified data relevant to each zone to obtain an image quality of the zone;
- and
- means for determining the quality of the image on the basis of the image quality of each zone.
An image forming device, comprising:
- means for forming an image;
- means for determining at least a parameter concerning a zone or a parameter concerning a distribution pattern of sampling points within the zone;
- means for measuring optical characteristic value of the formed image at least at each of the sampling points within the zone which are determined at least partially based on the determined parameter;
- means for performing Fourier analysis on the measured optical characteristic values of sampling points within each zone to obtain an image quality of the zone;
- and
- means for determining a quality of the image on the basis of the image quality of each zone.
A computer program product for making a computer to perform the following processes:
- a process for determining at least a parameter concerning a zone or a parameter of concerning a distribution pattern of sampling points within the zone;
- a process for identifying data that indicates position and optical characteristic value of each of the sampling points within the zone which are determined at least partially based on the determined parameter;
- a process for performing Fourier analysis on the identified data relevant to each zone to obtain an image quality of the zone;
- and
- a process for determining a quality of the image on the basis of the image quality of each zone.
Dependencies are inferred from the claim text.