Day and night camera, filter and optical system thereof

A technology for optical systems and camera devices, which is applied in the direction of optical filters for photography, optics, and components of television systems, etc. It can solve problems such as easy failures and expensive configurations, and achieve the effect of reducing damage and reducing light transmittance

Inactive Publication Date: 2009-12-23
SHENZHEN ADVANCE RIVER SYST TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to be equipped with an expensive and complicated filter switching system, and at least two filters are required, the cost of materials and maintenance is high, and it is prone to failure

Method used

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  • Day and night camera, filter and optical system thereof
  • Day and night camera, filter and optical system thereof
  • Day and night camera, filter and optical system thereof

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Embodiment Construction

[0021] The inventors have found through research that the root cause of the color cast in the daytime images is that the existing day-night cameras are difficult to take into account both night infrared shooting and daytime shooting, which is that the ratio of natural light and infrared light entering the camera during daytime shooting is too low. , is the unbalanced ratio of various colors of infrared light entering the camera. In the following, the inventors conducted in-depth research on the optical imaging process in daytime shooting mode and night shooting mode respectively, and found a solution to the problems in the prior art:

[0022] 1. The damage of infrared light to the color of the camera during the day:

[0023] 1) Objects reflect light

[0024] figure 2 It is a schematic diagram of the sunlight shining on the subject and the reflected light from the subject to the camera. image 3 It is a schematic diagram of the change curve of the relative radiation ratio b...

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Abstract

The invention discloses a day and night camera, a filter and an optical system thereof. The day and night camera comprises the optical system which comprises a lens, an image sensor and the filter arranged between the lens and the sensor; the optical system has color finesse D greater than 34.15 and infrared inductivity E greater than 1.45%, wherein, D=(Tkj*Tkl*delta C)/(Thj*Thl*delta CMAX), E=(Thj*Thl*Ths), the Tkj is transmittance of the lens for visible light, the Tkl is the transmittance of the filter for the visible light, the Thj is mean transmittance of the lens for infrared light between 800nm and 900nm, the Thl is the mean transmittance of the filter for the infrared light between 800nm and 900nm, the Ths is inductive capacity of the image sensor for the infrared light between 800nm and 900nm, the delta CMAX is a maximum difference of the mean inductive capacities of various RGB pixels in the image sensor for the infrared light between 800nm and 900nm, and the delta C is a maximum difference of the inductive capacities of two pixels in the delta CMAX for the visible light. The invention can achieve better technical effects of shooting by the day and night camera.

Description

【Technical field】 [0001] The invention relates to the technical field of video collection, in particular to a day and night camera device, an optical filter and an optical system thereof. 【Background technique】 [0002] Modern digital cameras mainly include image sensing components and image processing chips. Among them, for the image sensing element, there are two main technologies, namely charge coupled device (Charge Coupled Device, CCD) and complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS). [0003] The wavelength range of visible light is 380-780 nanometers, and the wavelength above 780 nanometers belongs to the infrared light part, while CCD and CMOS can sense both visible light and infrared light. When infrared light and visible light enter the CCD or CMOS at the same time and are sensed by it, the color of the captured image will be inconsistent with the color of the environment seen by the human eye, which is the so-called colo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/225H04N5/232G03B11/04
Inventor 张日和陈冠波
Owner SHENZHEN ADVANCE RIVER SYST TECH CO LTD
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