Video input processor, imaging signal-processing circuit, and method for reducing noises in imaging signals

Abstract

A video input processor is disclosed. The processor includes: an imaging signal-generating portion configured to image a subject and producing first imaging signals containing visible light components and a second imaging signal containing near-infrared light components; a gain adjustment portion configured to adjustably set a maximum gain value according to a relative magnitude between the visible light components and the near-infrared light components and adjust a gain for the first imaging signals at the set maximum gain value; and a noise reduction portion configured to reduce noises in the first imaging signals after the gain has been adjusted.

Description

Video input processor, imaging signal processing circuit and method for reducing noise Cross References to Related Applications The present invention contains subject matter related to Japanese Patent Application JP2007-131557 filed in the Japan Patent Office on May 17, 2007, the entire content of which is hereby incorporated by reference. technical field The present invention relates to a video input processor for imaging a scene and suppressing noise components of an imaging signal produced by signal processing. The invention also relates to an imaging signal processing circuit and a method for reducing noise in the imaging signal. Background technique The auto-exposure function is activated when a scene is imaged by a camera arrangement designed, for example, to image a motion picture sequence or a still image with increased ISO sensitivity. This shortens the exposure time of the sensor (imaging device) and increases the gain of the output signal from the sensor. T...

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Problems solved by technology

However, when the image passes through the low-pass filter, the resolution information is diffused and the steepness of each edge is degraded

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