Patent ID: 8451345
Filing Date: 2013-05-28
Classification: H04N

Abstract:
1. A flicker reduction device for reducing flicker components due to lighting that are contained in image signals imaged by imaging elements, the flicker reduction device comprising: an acquisition unit operable to acquire, for each screen, a sample line integral relating to each of at least one but not all of horizontal lines that constitute the screen, based on the image signals; a memory operable to store therein sample line integrals corresponding to a plurality of screens acquired by the acquisition unit; an inter-screen discrete Fourier transform unit operable to perform a discrete Fourier transform on a sample line integral sequence that is composed of (i) a sample line integral of one screen that has been most recently acquired by the acquisition unit and (ii) sample line integrals of a plurality of screens previous to the one screen that are stored in the memory, the most recently acquired sample line integral and the stored sample line integrals relating to horizontal lines at the same position in the respective screens; a flicker extraction unit operable to extract information of the flicker components based on a result of the discrete Fourier transform performed by the discrete Fourier transform; a flicker coefficient calculation unit operable to calculate a flicker coefficient for the image signals based on the information extracted by the flicker extraction unit; and a correction calculation unit operable to perform an operation for reducing the flicker components on the image signals based on the flicker coefficient calculated by the flicker coefficient calculation unit.