Ccd Cameras
Lecture Theatre Ccd Camera Knowledge, An Initial Understanding Of The Camera
1. What is a CCD camera?
CCD is ChargeCoupledDevice (charge-coupled device) stands, it is a semiconductor imaging device, which has high sensitivity, anti-glare, distortion, small size, long life, anti-vibration and so on.
2.CCD camera work Photo object image is focused through the lens to the CCD chip, CCD light intensity according to the ratio of accumulation of the corresponding charge, the charge accumulated in each pixel video sequence under the control of the relocation point by point, after filtering, amplification processing After the formation of the video signal output. Video signal connected to a monitor or TV video input with the original image can be seen the same video image.
3. Resolution of the choice Assess the level of the camera resolution is a resolution of the target, in units of line pairs, ie, after imaging can identify the number of black and white lines on. Commonly used in black and white cameras generally 380-600 resolution, color for the 330-480, the greater its value the more clear image. General surveillance occasions, with about 400 line black and white camera is enough to meet requirements. For health care, image processing and other special occasions, with 600 line camera to get a clearer picture.
4. Imaging sensitivity Usually the minimum illumination requirements of the environment that the camera sensitivity, black and white camera's sensitivity is about 0.02-0.5Lux (lux), color camera more than in 1Lux. 0.1Lux surveillance camera for the general situation; at night use or when ambient light is weak, recommended 0.02Lux camera. Used in conjunction with near infrared light, they must use low-light video camera. In addition the sensitivity of camera with lens related, 0.97Lux/F0.75 equivalent 2.5Lux/F1.2 equivalent 3.4Lux/F1.
Reference environment illumination: summer sun 100000Lux cloudy outdoor TV studio 1000Lux 10000Lux 60W lamp 60cm away from the desktop 300Lux indoor fluorescent light indoor 10Lux20cm Department 100Lux evening candlelight 10-15Lux night lights 0.1Lux
5. Electronic shutter Electronic shutter time 1/50-1/100000 seconds, the camera's electronic shutter is set to automatic electronic shutter normal way, can automatically adjust light and dark environment, the shutter time, get a clear image. Some cameras allow the user to manually adjust the shutter on their own time to meet special applications.
6. External synchronization with external trigger
External synchronization is different from video devices use the same sync signal to ensure synchronization of the video signal, it can ensure the output of different devices, the video signal has the same frame, the line beginning and ending time. To achieve external synchronization, the camera needs to enter a composite sync signal (C-sync) or composite video signals. External synchronization can not guarantee that users get full from the specified time frame continuous one, to achieve this feature, you must use some special features of the camera with external trigger.
7. Spectral Response Characteristics CCD device from the silicon material, sensitive to the near infrared spectral response can be extended to about 1.0um. The response peak green (550nm), the distribution curve as shown on the right. Night covert surveillance, you can use near-infrared light illumination, who saw unclear environmental conditions, they can be clearly on the monitor image. As the CCD sensor surface with a layer of UV-absorbing transparent electrode, so CCD is not sensitive to the ultraviolet. Color camera's imaging unit on the red, green, blue three-color filter, so you color camera on the infrared and ultraviolet are not sensitive.
8.CCD chip size
CCD imaging common size of 1 / 2 ", 1 / 3" and so on, the smaller the size of the camera image size can be done with less. The same optical lens, the image size larger field of view angle. Image plane size of the chip specification
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Clara Launch Video - High-resolution interline CCD camera
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