Method and device for automatically switching day and night modes

A mode switching and automatic switching technology, which is applied to color TV parts, TV system parts, TVs, etc., can solve the problems of device inconsistency, high cost, and inconsistent detection results, etc., to overcome repeated switching and cost Effect

Active Publication Date: 2014-01-22
ZHEJIANG UNIVIEW TECH CO LTD
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Problems solved by technology

(2) Device inconsistency: There are individual differences in photoresistors, and there are inconsistencies in the detection results of photosensitive voltages under the same environmental illumination. In addition, the inconsistency of the installation position of photoresistors will also lead to inconsistencies in test results; (3) Cost: photosensitive The resistor itself needs cost, and the design and installation of the process make it more expensive

Method used

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  • Method and device for automatically switching day and night modes
  • Method and device for automatically switching day and night modes
  • Method and device for automatically switching day and night modes

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Embodiment Construction

[0037] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] The method for automatically switching between day and night modes provided by the present invention is applied to a video camera, and specifically includes the following steps: A. calculating the brightness of the screen according to the currently captured image; B. switching between day and night modes according to the calculated brightness of the screen.

[0039] After the camera captures a frame of image, the image brightness histogram can be used to make statistics on the average brightness of the screen. The average brightness is the brightness of the currently calculated picture. Here, the brightness of the screen, that is, the brightness reflected by the lens, is used as the main judgment factor for the automatic switching between day and night modes, which is more in line with the requirements of human eye observation.

[0040...

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Abstract

The invention provides a method for automatically switching day and night modes. The method is applied to a camera and comprises the following steps of A, calculating the brightness of a picture according to a current photographed image; B, performing day and night mode switching according to the calculated brightness of the picture. According to the method provided by the technical scheme, the problems of cost, illumination and instruments which are caused by the adoption of a photoresistor in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of video surveillance, in particular to a method and device for automatically switching between day and night modes. Background technique [0002] In the video surveillance system, the automatic day and night switching function (also known as the automatic ICR function) of the front-end monitoring equipment is realized by automatically switching the IR cut-off filter according to the light intensity, and its purpose is to increase the sensitivity of the monitoring front-end equipment. When the front-end monitoring equipment is placed under dim light intensity, the IR cut-off filter is automatically removed, and the infrared sensitivity increases, and a clearer black-and-white image can be obtained with infrared light; Filters are automatically added to obtain clear images with true colors (visible light and infrared light entering the CCD or CMOS will interfere with color reproduction). The automatic switch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/238H04N7/18
Inventor 吕江明
Owner ZHEJIANG UNIVIEW TECH CO LTD
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