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Large lens article <br> <br> lens is essential for TV monitoring system suitable mating member, the lens and camera can be a CCD camera imaging the target surface of a target. The variety of lenses can be divided into short focal lengths, medium focal lengths, long focal lengths, and zoom lenses. According to Fan Qinghua, marketing manager of Sichuan Aipu Vision Digital Technology Co., Ltd., due to the lens selection is appropriate or not, is directly related to the quality of the quality of the camera, therefore, low-light camera must pay attention to the reasonable selection of the lens in practical applications. Otherwise, even if an ultra-sensitivity low-light camera is selected, the low-light efficiency of the ultra-sensitivity camera cannot be maximized because the lens is not properly selected. For example, the F value of the lens is very important, because the smaller the F value, will make the CCD sense more light, so only increase the amount of light through the lens to ensure the camera's sensitivity. Another example is that Oncam's special lenses allow longer wavelengths of light to enter, which ensures high video quality at night. In addition, Sony has developed a unique color filter technology that can capture more than twice as much light as conventional color filters in a dimly lit environment.
Effio-E Solution <br><br> As the main technology of low-light camera, sensors and digital signal processing have always been the focus of active research and development. In this regard, Sony has been at the forefront of the industry, in addition to the introduction of high-performance image sensor SuperHADCCDII (high-performance positive hole accumulation sensor, can achieve 1000mV or higher than 1μm2 high sensitivity) and EXviewHADCCDII (can achieve 1000mV or higher With a sensitivity of 1 μm2 and improved infrared light efficiency in the near-infrared region, new DSP technology advances have also been achieved - in 2010 SONY introduced the "Effio-E" (Color High-Definition Digital Processing Technology) solution.
What is Effio? Effio means powerful features and a fine image processor. It is a signal processor developed and developed by Sony that enables high resolution, high signal-to-noise ratio, and high-quality color reproduction of cameras.
The "Effio-E" solution uses SONY's most advanced CCD and is equipped with the most advanced SS-4 digital processing technology. The new ultra-wide dynamic technology has a wider range of applications, along with functions such as motion detection and face detection, providing excellent picture quality for low-light cameras.
Sony's "Effio" digital signal processor provides high-definition picture quality, high signal-to-noise ratio, and high color reproduction capability. It supports NTSC-standard 480K effective pixel CCDs and PAL-standard 570K effective pixel CCDs. With the EffioDSP and the new CCD, the resolution of more than 650 TVlines can be achieved. Compared with the standard camera, this method can provide a clearer image, and the color signal processor can provide the ideal color brightness and concentration. balance.
Effio combines 2D and 3D noise suppression signal processors to reduce noise, even when shooting moving objects without loss of dynamic resolution. In addition, Effio incorporates peripheral circuit designs that not only reduce camera size, but also reduce power consumption.
After most of the autofocus <br> <br> fixed-focus camera in low-light (visible light) during the day better effect, because the focal length is more sensitive to shorter wavelength light.
When the infrared light filter is switched off at night so that the near infrared light enters, the camera will lose focus due to the longer wavelength.
Panasonic and Pyle Higher Corporation have developed automatic back focus (ABF) technology that automatically adjusts the position of the sensor after focal length conversion to ensure night vision for low-light cameras. When switching from the color mode to the black and white mode, the camera with the (ABF) device automatically performs precise focus adjustment at the CCD position to precisely achieve the back focus. This solves the problem that the traditional camera will blur the image after removing the IR filter.
In addition, products with automatic back focus adjustment can automatically adjust the back focus by touching a single button. When switching from color mode to black and white mode, the CCD position is automatically adjusted to ensure accurate focus throughout the day.
Lock detecting infrared night <br> <br> conventional conversion is exteroceptive visible light intensity, when the visible light is below a predetermined value, the switching circuit is started, controls the operation of the filter, to realize black and white to color conversion. When using the camera in a low-light environment, the camera may be affected by the external environment for a short period of time and misjudging the ambient illumination (such as the headlights of the car) from black and white mode to color mode, but the actual ambient illumination is still low. After the car passes by, the camera will switch from the color mode to the black and white mode again. This will cause frequent day and night transitions, affecting the monitoring results and reducing the life of the filter switching motor.
Currently, a low-light camera launched by China Digital AMPON has its own infra-red detection and locking technology, which will not cause short-term glare (even if it is under low light conditions at night). For example, when the vehicle passes through the headlights, frequent switching between day and night can help maintain the stability of the monitoring, the continuity of the picture, and the service life of the product. The camera can automatically detect infrared light, as long as the infrared light is turned on, you can lock in the night mode to ensure stable operation of the camera. In addition, this camera has 540 lines of color, horizontal resolution of 600 lines of black and white, minimum illumination of 0.02 Lux for the color mode and 0.005 Lux of the black and white mode, which can effectively meet users' night-time monitoring requirements and capture high-definition pictures. And configure automatic gain, automatic white balance, backlight compensation and other functions, make the image more real, more beautiful, very suitable for "Safe City" projects, road traffic monitoring and other places that need 24-hour surveillance.
At the same time, on the basis of comprehensive consideration of the advantages and disadvantages of various technologies, AMPON has launched a self-developed ultra-low illumination technology, the CDS low-noise preamplifier. Through the secondary sampling circuit (CDS), the gain of the amplifier can be increased to create an extra 6dB of extra-low illumination.
3D + 2D DNR <br> <br> Further, the DSP process of the key role of noise in the picture quality to enhance the low light video camera, the performance difference is also reflected in the manufacturers of the camera part. General low-light cameras often result in reduced sharpness due to excessive noise. Samsung's low-light camera adopts its own 3D+2D digital noise reduction technology developed by the company. It uses 3D filtering when processing static images, and 2D filtering when dynamic. After the processing is completed, the images are merged, and the resulting picture appears more clear and delicate. In the processing of noise reduction, the effect of the low-light camera can still be improved by subdividing the picture sampling, improving the processing algorithm, and refining the automatic gain.
Embedded illumination color brightening board <br> <br> greatly influenced by traditional cameras shooting conditions, the camera picture becomes clear in dim ambient light is weak, Shenzhen Rui Si Ling Video Technology Co., Ltd. R & D An embedded low-lightness brightening board is provided, which can help the camera to significantly improve the overall brightness and sharpness of the screen and avoid the monitoring of the blind area caused by insufficient light in the monitoring scene. In addition, the board can be automatically adjusted in real time according to the brightness of the screen to ensure that the output screen is optimal.
The board uses "retina simulation + local feature recognition + image dynamic clarity" technology, embedded design, direct processing of the video data collected by the lens, significantly improve the camera's shooting performance in low illumination, so that the camera has a low illumination camera effect. From another perspective, the board also reduces the cost of achieving low illumination.
The key points to improve the quality of low-light surveillance cameras
Low-illuminance camera mainstream manufacturers are familiar with automatic iris control and real day/night functions (with switchable infrared filter), in order to enhance the low-light camera's image quality (especially night vision effect), or improve the lens, adjust Sensors and the development of new digital signal processing, or choose to highlight the board, infrared lights and so on.