Ccd Camera

Amphitheater knowledge CCD camera, an initial understanding of the camera
1. What is a CCD camera?

The CCD is ChargeCoupledDevice (charge-coupled device) is, it is an imaging device, semiconductor, which has high sensitivity, anti-glare, distortion, small size, long life, anti-vibration and so on on.

2.CCD camera picture object image is focused through the lens of the CCD chip, CCD light intensity as a function of the accumulation of the corresponding charge, the charge accumulated in each pixel video sequence under the control of point of resettlement point, after filtering processing of amplification, after the formation of the output video signal. The video signal connected to a monitor or TV video input with the original image can be seen from the video image itself.

3. Resolution of choice to assess the level of the camera resolution is a resolution of the target, in units of line pairs, after imaging can identify the number of black lines on white. Commonly used in black and white cameras generally 380-600 resolution, color for the 330-480, the more value the image clearer. opportunities for general surveillance, with about 400 line of cameras in black and white is sufficient to meet the needs. For health care image processing, and other special occasions, with 600 line camera to obtain a clearer picture.

4. Usually imaging sensitivity, minimum illumination of the environment and the sensitivity of the camera, black and white camera sensitivity is 0.02 0.5Lux (lux) color camera more than 1Lux. 0.1Lux camera monitoring the general situation, the use or the night when ambient light is low, recommended 0.02Lux camera. Used in conjunction with near infrared light, they must use the video camera in low light. In addition, the sensitivity of the camera with lens related 0.97Lux/F0.75 2.5Lux/F1.2 equivalent 3.4Lux/F1 equivalent.

illumination reference environment: sun 100000Lux cloudy summer television studio outdoor 60cm 1000Lux 10000Lux 60W lamp away from fluorescent light office 300Lux Interior Interior Department 10Lux20cm 100Lux candles at night the lights at night 10-15Lux 0.1Lux

5. Electronic Shutter Electronic shutter time 1/50-1/100000 seconds, electronic shutter of the camera is set to automatic electronic shutter normal way, can automatically adjust the environment light and darkness, the shutter time, obtain a clear picture. Some devices allow the user to manually adjust the shutter on their personal time to meet special applications.

6. External synchronization with external trigger

External synchronization of different video devices, use the same sync signal for synchronizing the video signal, it can ensure the production of different devices, the video signal is the same framework, the line start and end. To achieve external synchronization, the device requires you to enter a composite sync signal (C-sync) or composite video signals. External synchronization can not guarantee that users are fully specified period of uninterrupted, to get this feature, you must use some special features of the camera with external trigger.

7. Spectral Response Characteristics CCD camera from silicon material, sensitive to the response in the near infrared spectrum can be extended to about 1.0um. The green peak response (550nm), the distribution curve as shown on the right. Night of secret surveillance, you can use in the near-infrared light illumination, which has seen clear environmental conditions, they can be clearly on the monitor image. As the surface of CCD sensor with a layer of UV-absorbing transparent electrode, so CCD is not sensitive to ultraviolet. imaging unit color photo on the red filter, green, blue three colors, so you color camera on the infrared and ultraviolet rays are not sensitive.

8.CCD size of the chip

size CCD imaging common 1 / 2 "third" and so on, the smallest.