Patent ID: 8432460

Claim:
A flicker detection device comprising: an accumulation section that divides each image frame of successive image frames, captured via global shuttering, into a plurality of image areas to perform accumulation of pixel levels, respective pairs of non-successive image frames being captured in phase with respect to a frequency cycle of a periodic illumination causing flicker, the accumulation section writing and reading accumulation data to and from a memory area allocated to the plurality of image areas to accumulate pixel levels in the memory area as accumulation results; an accumulation result memory that stores the accumulation results of the accumulation section; an area discrimination section that discriminates whether or not each of the plurality of image areas is a still image area using an accumulation result obtained by the accumulation section associated with a first image frame of one of the pairs of non-successive image frames and a previous accumulation result stored in the accumulation result memory associated with a second image frame of said one of the pairs of non-successive image frames; and a flicker level calculation section that calculates a flicker level by averaging accumulation results associated with image areas discriminated as still image areas by the area discrimination section to obtain an averaged accumulation result, and by performing an operation using the averaged accumulation result and the accumulation result obtained by the accumulation section associated with the first image frame of said one of the pairs of non-successive image frames.