Patent ID: 7880804
Filing Date: 2011-02-01
Classification: G03B

Abstract:
1. A high frequency information detecting device for weighting a high frequency component of an imaging video signal obtained by an image sensor and thereafter extracting high frequency information for auto focus, the device comprising: a weighted gain generator for setting a reference point in a high frequency information detecting frame after setting the high frequency information detecting frame in an imaging screen of the image sensor, and generating a two dimensional weighted gain for pixels in the high frequency information detecting frame, the two dimensional weighted gain having a circular characteristic in which, for any pixel in the high frequency information detecting frame, a weight for the pixel in the high frequency information detecting frame becomes larger as the distance between the pixel and the reference point becomes smaller, and the reference point has the highest weight in the high frequency information detecting frame; and a gain adjuster for making the gain weighted by the weighted gain generator act on the high frequency component of the imaging video signal.