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1. (WO2009125665) IMAGE SIGNAL PROCESSING DEVICE, IMAGING SYSTEM, IMAGE SIGNAL PROCESSING PROGRAM, AND IMAGE SIGNAL PROCESSING METHOD

Pub. No.:    WO/2009/125665    International Application No.:    PCT/JP2009/055651
Publication Date: Oct 15, 2009 International Filing Date: Mar 23, 2009
IPC: H04N 5/243
H04N 5/232
Applicants: OLYMPUS CORPORATION
オリンパス株式会社
SAMBONGI, Masao
三本木 將夫
Inventors: SAMBONGI, Masao
三本木 將夫
Title: IMAGE SIGNAL PROCESSING DEVICE, IMAGING SYSTEM, IMAGE SIGNAL PROCESSING PROGRAM, AND IMAGE SIGNAL PROCESSING METHOD
Abstract:
Provided is an image signal processing device including: an AE sensor (105) which measures a luminance of an object and acquires the size of the luminance range; a gradation conversion characteristic calculation unit (111) which calculates gradation conversion characteristic according to pixel values of pixels contained in an image signal of the image containing the object whose luminance has been measured; a correction unit (112) which corrects the gradation conversion characteristic; and a gradation conversion unit (113) which gradation-converts an image signal by using the corrected gradation conversion characteristic. When the luminance range acquired by the AE sensor (105) is relatively small, the correction unit (112) corrects the gradation conversion characteristic so as to approach the gradation conversion characteristic calculated by the gradation conversion characteristic calculation unit (111) as compared when the luminance range is relatively large.