Method for reducing noise and increasing gain of low-illuminance cameras
A camera and low-illumination technology, applied in image communication, color TV parts, TV system parts, etc., can solve problems such as signal-to-noise ratio deterioration and picture quality degradation, and achieve the effect of improving sensitivity
Inactive Publication Date: 2012-01-04
SHENZHEN AIRONIX INDAL
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Problems solved by technology
[0012] The technical problem to be solved by the present invention is that for the camera system signal existing in the ultra-low illumination camera in the prior art, the original charge-coupled device output contains reset noise due to the Reset action, and the signal changes with the intensity of the light signal. The picture quality produced by the luminance signal is degraded, and the signal-to-noise ratio of the entire system is deteriorated, so that the reset noise of the entire camera system can be completely eliminated, the low-illuminance characteristics can be better improved, and the minimum illuminance of the system can be effectively improved. , to obtain an image brightness output signal with a high signal-to-noise ratio
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[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0028] Such as Figure 1 to Figure 3 As shown, the present invention provides a method for reducing noise and boosting gain of a low-illuminance camera, the method is based on a camera using a charge-coupled image sensor 6, and the method includes:
[0029] A. The image signal output terminal of the charge-coupled image sensor 6 is connected with a relevant secondary sampling and holding circuit;
[0030] B. After the image signal enters the relevant secondary sampling and holding circuit, it is divided into two circuits by two capacitors, one is the upper circuit, and the other is the lower circuit;
[0031] C. Connect XSHP sampling pulse 1 and XSHD sampling pulse 2 to the upper circuit and the lower circuit respectively;
[0032] D. A differential amplifier 7 is then connected at the output of the upper circuit and the lower circu...
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The invention discloses a method for reducing noise and increasing gain of low-illuminance cameras, which applies to low-illuminance or super-sensitivity cameras. The method is based on a camera adopting a charge-coupled image sensor. The method comprises: connecting the image signal output end of the charge-coupled image sensor with a relevant secondary sampling-holding circuit and dividing image signals after entering the relevant secondary sampling-holding circuit into two paths of signals through two capacitors, wherein one path of signals is a top circuit, and the other path of signals is a bottom circuit; connecting XSHP sampling pulses and XSHD sampling pulses to the top circuit and the bottom circuit respectively; and connecting the output parts of the top circuit and the bottom circuit with a differential amplifier. The method has the advantage of ensuring that the low-illuminance cameras can be greatly improved in sensitivity to external light, can show optimal effects in various illumination environments, and can still clearly identify images and display real-time continuous pictures even in very dark environments.
Description
technical field [0001] The invention relates to a method for reducing noise and increasing gain of a camera, in particular to a method for reducing noise and increasing gain of a low-illuminance camera when the ambient light illuminance of an object is low. Background technique [0002] Low-illumination cameras have existed in the market for many years, from the earliest day and night dual-purpose color black and white switching, slow shutter image accumulation, or the use of ultra-low illumination CCD, to the current popular infrared projection cameras, there are many types . Yet none of the methods is its downside. The following introduces several low-speed cameras on the market: [0003] 1. Day and night dual-use type: [0004] There is still a certain market demand for such cameras in the market. It utilizes the feature of black-and-white images with high sensitivity to infrared rays. Under certain light conditions, it uses line switching to convert images from color...
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IPC IPC(8): H04N5/357H04N5/378H04N5/21
Inventor 葛俭
Owner SHENZHEN AIRONIX INDAL