This year's wide dynamic video surveillance space is huge

Higher dynamic range and more realistic colors With the birth and spread of DPS pure digital sensing technology, it will gradually appear in a new generation of wide dynamic cameras. At present, the first generation of wide dynamic cameras using DPS technology launched by Funidaida has a good market response, and it is believed that it will gradually demonstrate its charm in the future market inspection. It can be expected that in the near future, the wide dynamic camera market will face the competition of DSP and DPS sensing technologies, and the dynamic range will inevitably continue to expand, with broad prospects.

The market for wide dynamic video surveillance is huge. We know that the core of the camera is CCD. At present, there is no production capacity of CCD in China, mainly in Japan and South Korea. Because CCD is divided into different grades in the production process and the way that the manufacturer gets is different, the collection effect of CCD is also different. A simple detection method is to energize the camera, do not connect the lens, cover the lens interface by hand, see if there are bright spots in the image, the snow is not big, and then connect the camera, point the camera at a bright object, view and monitor Whether the color of the device is color cast, whether the image is distorted, and whether the color and the gray scale are smooth.

In 1997, Panasonic developed ultra-dynamic technology and applied it to cameras to market. Subsequently, major camera manufacturers around the world also launched cameras with their own wide dynamic technology. In the interim, wide dynamic technology has developed rapidly in recent years, and the dynamic range of the camera has also been continuously expanding. There are also technologies such as two-speed CCD DSP and ordinary CCD two-speed shutter. Today's wide dynamic cameras generally use dedicated DSP circuitry. It first exposes the subject in the bright area with the most suitable shutter speed, then exposes the object in the dark area with the most suitable shutter speed, and finally processes the two images with the DSP digital signal, which will capture The two images are recombined on one image, making it possible to enlarge the dynamic range that may be handled, so that both the bright area subject and the dark area subject can be seen clearly.

With the birth and spread of DPS pure digital sensing technology, higher dynamic range and more realistic colors will gradually appear in the new generation of wide dynamic cameras. At present, the first generation of wide dynamic cameras using DPS technology launched by Funidaida has a good market response, and it is believed that it will gradually demonstrate its charm in the future market inspection. It can be expected that in the near future, the wide dynamic camera market will face the competition of DSP and DPS sensing technologies, and the dynamic range will inevitably continue to expand, with broad prospects.

Wide dynamic camera technology applications 1. Wide dynamic range The broad sense of “dynamic range” refers to the range of possible changes in a certain thing, ie the region between the lowest end pole and the highest end pole of its change value. It is generally the difference between the highest point and the lowest point. This is a very widely used concept. When talking about the camera's captured image indicators, the general "dynamic range" refers to the camera's ability to adapt to the scene's light reflection in the shooting scene, specifically the brightness (contrast) and color temperature (contrast) ) The range of changes.

The wide dynamic range is the ratio of the brightest luminance signal value to the most recognizable dark luminance signal value of the image. The expression for measuring the wide dynamic range is expressed in terms of “multiples” or “dB”. When 100IRE is used as a standard, the conversion formula is: NdB=20log(V2/V1). The wide dynamic value of an ordinary camera (called V1) is 10dB, such as a wide dynamic of 48dB, and the difference between a common camera and a 38dB, V2/V1=80, indicating that the wide dynamic difference from an ordinary camera is 80 times. Some manufacturers The wide dynamic camera is 54dB, V2/V1 = 160 times. Jing Yang wide dynamic camera typical dynamic range 101dB, maximum wide dynamic range 120dB.

2. Sharpness In order to achieve the monitoring of the details of the object, the horizontal resolution of the wide dynamic camera should be more than 480 lines. At present, the horizontal resolution of many manufacturers generally is 480 lines or 540 lines. Jing Yang wide dynamic camera horizontal resolution 540 lines, vertical resolution 460 lines, to meet the user's requirements for clarity.

3. Minimum illuminance In the case of poor light conditions in the hall, doorway, or indoor window, detailed monitoring of the object requires the wide dynamic camera to have excellent low-light performance. Some manufacturers of wide dynamic cameras in the case of poor light conditions, the image noise, image quality in the night environment is poor, can not get high-quality images.

4, color reproduction Many manufacturers in the processing of wide dynamic effects, the need for exposure to bright areas and shadow areas, the image will often lose the original color, resulting in the image color is not true. While achieving the ideal wide dynamic effect, the color reproduction of the image is also a problem that the manufacturer needs to consider and solve later.

Wide dynamic camera market outlook With the rapid expansion of the use of the environment and the increasing diversity of users, camera technology and classification have also undergone tremendous changes. Each manufacturer is always committed to improving the camera's new technology so that it can meet the application requirements to the greatest extent possible. Among them, the wide dynamic camera is a very important branch. To a certain extent, it also reflects the strength and direction of the development of a camera manufacturer. We know that the core of the camera is the CCD. At present, there is no domestic CCD production capacity, mainly in Japan and South Korea. Because CCD is divided into different grades in the production process and the way that the manufacturer gets is different, the collection effect of CCD is also different. A simple detection method is to energize the camera, do not connect the lens, cover the lens interface by hand, see if there are bright spots in the image, the snow is not big, and then connect the camera, point the camera at a bright object, view and monitor Whether the color of the device is color cast, whether the image is distorted, and whether the color and the gray scale are smooth.

In 1997, Panasonic developed ultra-dynamic technology and applied it to cameras to market. Subsequently, major global camera manufacturers also launched cameras with their own wide dynamic technology. In the interim, wide dynamic technology has developed rapidly in recent years, and the dynamic range of cameras has also been continuously expanding. There are also technologies such as two-speed CCD DSP and ordinary CCD two-speed shutter. Today's wide dynamic cameras generally use dedicated DSP circuitry. It first exposes the subject in the bright area with the most suitable shutter speed, then exposes the object in the dark area with the most suitable shutter speed, and finally processes the two images with the DSP digital signal, which will capture The two images are recombined on one image, making it possible to enlarge the dynamic range that may be handled, so that both the bright area subject and the dark area subject can be seen clearly.