| 摘要 |
An image processing apparatus includes a shading data calculating section for two-dimensionally mapping digitized data obtained by photo-electrically detecting uniform light converged by a lens by a two-dimensional sensor, thereby producing two-dimensional shading data whose density signal levels ellipse-like lower outwardly from a center pixel corresponding to the center of the lens to produce one-dimensional shading data from the density signal levels of the two-dimensional shading data on an arbitrary straight line extending outwardly from the center of the center pixel and calculating the angle theta between the straight line used for producing the one-dimensional shading data and the longer axis of the ellipse and the ratio of the longer axis to the shorter axis of the ellipse, a shading data memory for storing the one-dimensional shading data, the angle theta and the ratio of the longer axis to the shorter axis of the ellipse, a shading correction data producing section for producing shading correction data of each pixel based on the one-dimensional shading data, the angle theta and the ratio of the longer axis to the shorter axis of the ellipse stored in the shading data memory in accordance with distance between the center of the center pixel and itself and an angle between a straight line passing through the center of the center pixel and itself and the longer axis of the ellipse and a shading correcting section for correcting shading of image data based on the shading correction data. According to the thus constituted image processing apparatus, it is possible to simply correct the shading of an image produced by a two-dimensional sensor by converging onto the two-dimensional sensor light through a lens. |
