Evaluating method of image information, storage medium having evaluation program stored therein, and evaluating apparatus
View Patent ↗An evaluating method of image information acquires image information, performs camera shake evaluation of the image information by determining a camera shake direction on the basis of the image information, and performs out-of-focus evaluation of the image information by using information concerning a camera shake direction determined in the camera shake evaluation.
1. An evaluating method image information, comprising:
acquiring image information;
calculating, by a computer, a camera shake degree in a camera shake direction based on the image information;
calculating, by the computer, a camera shake degree in a direction perpendicular to the camera shake direction based on the image information; and
evaluating, by the computer, whether the image information is out-of-focus or not based on the camera shake degree in the camera shake direction and the camera shake degree in the direction perpendicular to the camera shake direction.
2. An evaluating method according to claim 1 , wherein
the calculating the camera shake degree in the camera shake direction comprises extracting a sample line in the camera shake direction and calculating the camera shake degree in the camera shake direction based on an autocorrelation function of the extracted sample line; and
the calculating the camera shake degree in the direction perpendicular to the camera shake direction comprises extracting a second sample line in the direction perpendicular to the camera shake direction and calculating the camera shake degree in the direction perpendicular to the camera shake direction based on an autocorrelation function of the second extracted sample line.
3. An evaluating method according to claim 1 , wherein:
the camera shake degree in the camera shake direction is calculated based on a function by setting the camera shake direction as an argument, and
the camera shake degree in the direction perpendicular to the camera shake direction is calculated based on said function by setting the direction perpendicular to the camera shake direction as an argument.
4. An evaluating method according to claim 1 , wherein:
the image information is divided into a plurality of areas,
a luminance difference within each of the divided areas is calculated,
an area in which the luminance difference is largest is selected, and
the camera shake degree in the camera shake direction and the camera shake degree in the direction perpendicular to the camera shake direction are calculated in the selected area.
5. An evaluating method according to claim 1 , wherein
an out-of-focus correction is performed on the image information in case the image information is evaluated as an out-of-focus image.
6. An evaluating method according to claim 5 , wherein
image information subjected to the out-of-focus correction is displayed at no magnification.
7. An image information evaluating apparatus, comprising:
a memory; and
an arithmetic processing unit that;
acquires image information,
calculates a camera shake degree in a camera shake direction based on the image information,
calculates a camera shake degree in a direction perpendicular to the camera shake direction based on the image information, and
evaluates whether the image information is out-of-focus or not based on the camera shake degree in the camera shake direction and the camera shake degree in the direction perpendicular to the camera shake direction.
8. An image information evaluating apparatus according to claim 7 , wherein the image information evaluating apparatus is a printing apparatus.
9. An image information evaluating apparatus according to claim 7 , wherein the image information evaluating apparatus is a photographing apparatus.