Clamp level adjusting apparatus, electronic camera, image processing apparatus, and image processing program

摘要

A clamp level adjusting apparatus of the invention includes: an image pickup device which has an effective pixel area for producing an image signal and a lightproof area formed around the effective pixel area to produce a black level standard signal; a clamp level calculating section for extracting the black level standard signal from an extracting range of a plurality of horizontal rows in the lightproof area and for producing a clamp level value corresponding to each horizontal row in the effective pixel area based on a vertical moving average value of black level standard signals in the extracting range; and a clamp section for correcting a black level of the image signal based on the clamp level value.