Detection method for resolution ratio of camera lens

A detection method and camera technology, applied in the field of detection, can solve the problems of low resolution of camera lens, unclear observation, hidden dangers endangering life safety, etc., and achieve high random signal-to-noise ratio, small single frequency and pulse interference, and sound quality. high effect

Inactive Publication Date: 2018-08-17
国信紫晶科技(江苏)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, dust and dirt carried by the wind or from air pollution may deposit on the camera. A common problem that arises when there is a collection of raindrops or dust particles in the field of view of the camera is: checking the resolution of the camera lens The rate is low, and the observation is not clear, so there will be hidden dangers that endanger life and safety

Method used

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  • Detection method for resolution ratio of camera lens

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Embodiment 1

[0012] Embodiment one, a kind of detection method of camera lens resolution, comprises video camera 1, light source box 2, standard video detector 3 and main system 4, camera 1 is connected with light source box 2, standard video detector 3 respectively, and The standard video detector 3 is provided with a resolution test card, the video output terminal of the main system 4 is connected to the waveform monitor 5 , and the output of the waveform monitor 5 is connected to the standard video monitor 3 .

[0013] Image main interference types:

[0014] interference type

Embodiment 2

[0015] Embodiment 2, the distance between the standard video detector 3 and the camera 1 is set to 3m, and the focal length of the lens on the camera 1 is adjusted so that the image of the resolution card fills the standard video detector 3 . Turn off the automatic gain control of camera 1, adjust the brightness of the object to make the output video signal amplitude of camera 1 be 50% of the maximum value, set the illumination of the scene to 2000lx, and set the color temperature of the light source to 3200K.

[0016] Before the installation of camera 1, simple random sampling should be carried out for camera 1; the sampling rate should not be lower than 20% and should not be less than 3 sets, and 100% testing should be performed for equipment with less than 3 sets; On the standard spectral color temperature light box, 3 meters away from the camera,

[0017] Turn off the automatic gain control of the camera and adjust the brightness of the subject so that the output video sig...

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Abstract

The invention discloses a detection method for a resolution ratio of a camera lens. The method comprises a camera, a light source box, a standard video detector and a main system. The method comprisesthe steps of connecting the camera with the light source box and the standard video detector separately, arranging a resolution ratio test card on the standard video detector, connecting the video output end of the main system with a waveform monitor, and connecting the output of the waveform monitor with the standard video detector. The detection method for the resolution ratio of the camera lens provided by the invention has the beneficial effects that the resolution ratio of the lens can be detected, the random signal noise is relatively large, and the smaller the noise mixed in the signalis, the higher the sound quality of played back sound is. Single frequency and pulse interferences are relatively small.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a method for detecting the resolution of a camera lens. Background technique [0002] Surveillance cameras are commonly used to monitor buildings, roads, shops, and various other places. In particular, cameras are often used to monitor scenes to allow automatic detection or tracking of events, such as the presence of motion or the presence of certain types of of the object form. These surveillance cameras can be used both indoors and outdoors. Surveillance cameras installed outdoors are sometimes exposed to harsh weather conditions such as wind, snow and rain. In addition, dust and dirt carried by the wind or from air pollution may deposit on the camera. A common problem that arises when there is a collection of raindrops or dust particles in the field of view of the camera is: checking the resolution of the camera lens The rate is low, and the observation is not clear, so t...

Claims

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Application Information

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IPC IPC(8): H04N17/00
Inventor 席修建
Owner 国信紫晶科技(江苏)有限公司
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