SHADING CORRECTION CALCULATION APPARATUS AND SHADING CORRECTION VALUE CALCULATION METHOD

摘要

The apparatus calculates a first relation representing a relation of mapping from an image capturing coordinate system of a camera to a shading correction coordinate system of a display apparatus, by using a first captured image acquired by capturing a first display image, and calculates a second relation by removing, from the first relation, a part corresponding to an object located between the first display image and the camera. The apparatus calculates a first gradation value in the shading correction coordinate system by performing a mapping transformation using the second relation on a second captured image acquired by capturing a second display image, calculates from the first gradation value a first correction value for the shading correction coordinate system, and calculates through an interpolation using the first correction value a second correction value for a part thereof where the first gradation value is not calculated.

主权项

1. A shading correction calculation apparatus configured to calculate a correction value by using a captured image acquired from an image capturing apparatus that captures a display image displayed on a display surface by an image display apparatus, the correction value being used for a shading correction to be performed by the image display apparatus, the shading correction calculation apparatus comprising:
a first mapping calculator configured to calculate a first mapping relation by using a first captured image acquired from the image capturing apparatus that captures a first display image displayed by the image display apparatus, the first mapping relation representing a relation of mapping from an image capturing coordinate system of the image capturing apparatus to a shading correction coordinate system of the image display apparatus; a second mapping calculator configured to calculate a second mapping relation by detecting an object part of the first mapping relation and removing the object part from the first mapping relation, the object part corresponding to an object located between the display surface and the image capturing apparatus; a gradation value calculator configured to calculate a first gradation value in the shading correction coordinate system by performing a mapping transformation using the second mapping relation on a second captured image acquired from the image capturing apparatus that captures a second display image displayed by the image display apparatus; a first correction value calculator configured to calculate, from the first gradation value, a first correction value as the correction value for a first part of the shading correction coordinate system; and a second correction value calculator configured to calculate, through an interpolation process using the first correction value, a second correction value as the correction value for a second part of the shading correction coordinate system, the second part being a part where the first gradation value is unable to be calculated by the mapping transformation.