IMAGE PROCESSING APPARATUS AND METHOD, AND PROGRAM AND RECORDING MEDIUM

摘要

In a camera which electronically realizes panning, tilting, and zooming, on the basis of the luminance detected in each frame period (n−1), a condition of exposure for two frame periods thereafter (n+1), and digital gain for three frame periods thereafter (n+2) are set. When an instruction for changing the extracted region is received in a certain frame period (n−1), the region extracted from the image is changed three frame periods thereafter. It is possible to achieve a stable exposure control by which the luminance of the image varies little even when the region extracted from the image is switched.

主权项

1. An image processing apparatus comprising:
a digital gain application unit for multiplying, by a digital gain, a captured image signal output from an image capture unit which captures images in units of frame periods, to generate a luminance-adjusted captured image signal; a luminance detection unit for detecting luminance of each of a plurality of regions which respectively form parts of a captured image represented by the captured image signal generated by said digital gain application unit; an extraction unit for selecting one of the plurality of regions of the captured image, in accordance with designation information designating a region to be extracted, extracting an image of the selected region, and performing distortion correction; and a control unit for, on a basis of the luminance detected by said luminance detection unit, setting a condition of exposure in said image capture unit, and setting the digital gain used in said digital gain application unit; wherein when the designation information is changed from information designating a first region to information designating a second region, in a first frame period, said control unit changes the luminance used for setting said condition of the exposure and said digital gain in a frame period immediately following said first frame period, from the luminance of said first region to the luminance of said second region, and instructs said extraction unit to change the region extracted from the captured image signal, from said first region to said second region, upon expiration of three frame periods after said first frame period.