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With the diversification of the use environment and the increasing diversity of users, camera technology and classification have also undergone many changes. Among them, the wide dynamic camera is a very important one. To a certain extent, it also represents the technical development strength and development direction of a camera manufacturer. 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 two-speed shutter. Today's wide dynamic cameras use a dedicated DSP circuit that makes it possible to see both the bright area subject and the dark area subject.
At present, wide dynamic cameras are mainly used in the financial industry, followed by parking lots, plazas, building entrances and exits, ports, and road toll stations. During the spring, summer, autumn and winter seasons, light changes are complex during the working hours of each day. To capture all details of the characters in the surveillance range, a high-quality wide dynamic camera is required. This can not only help the police to crack down on criminal cases, but also The evidence of the dispute occurred.
Problems to overcome with wide dynamic cameras
Although the wide dynamic technology solves the problem of ineffective imaging of the camera under severe backlighting or complex light conditions where bright and dark areas intersect, it is more prominent than ever before. However, from the perspective of development, there are also some shortcomings that accompany wide dynamic functions. . For example, the wide dynamic range of the camera, the sensitivity will decrease; in addition to the sensitivity, the wide dynamic open, the other indicators are also more or less influential, such as clarity, color reproduction, wide dynamic effect of a stable time delay. It is often seen that some wide dynamic cameras have wide dynamic effects when their wide dynamic function is turned on, but they also see blurring of the picture, deterioration of color reproduction, slowness of wide dynamic effects, and the like.
In fact, there are many factors that affect the effects of a wide dynamic camera, such as different combinations of camera chips, will have different effects. The sensor chip of the front-end camera can not determine all, and it is also related to the processing system of the later impact. In addition, the combination of CMOS firmware, if the same photosensitive chip, but if the combination of ISP or DSP, if different, wide dynamic display will be different. The firmware can be used to improve the computing performance of the ISP and enhance the image, but the most obvious difference depends on the hardware it uses.
The wide dynamic function is also related to the preset value of the camera. Each manufacturer has its own custom image imaging method, so the setting preferences in the actual application scenario are also different. Therefore, even if the manufacturer uses the same chip combination, the preset value is different and the wide dynamic performance will be different.
Some users will also worry about whether the wide dynamic features will be affected by the type of camera for the network, analog or HD-SDI. On the technical level, the camera interface does not affect the wide dynamic display, so the use of network, analog or SDI cameras does not affect the wide dynamic efficiency, the main difference depends on the camera is to use CMOS or CCD, the use of CMOS camera wide dynamic range often More extensive.
Although the development of wide dynamic technology is rapid, the low illumination point is still high and cannot be as sharp as the human eye. When the background is darker, the wide dynamic performance is worse. Most of the wide dynamic cameras need to be equipped with a backlight compensation function to improve the image capture quality of a high light difference environment.
Other limitations of wide dynamics include: limited aperture ratio and image smearing issues. Since the images are stacked one by one, the problem of image smearing is always inevitable when the objects are moved. This is the reason why only a few leading brands can meet the needs of users.
Always wide dynamic cameras have different requirements in each application. In different environments, the effect of wide dynamic camera is also affected. There are still many obstacles to overcome in order to achieve high-definition applications for wide dynamic cameras.
At present, wide dynamic cameras are mainly used in the financial industry, followed by parking lots, plazas, building entrances and exits, ports, and road toll stations. During the spring, summer, autumn and winter seasons, light changes are complex during the working hours of each day. To capture all details of the characters in the surveillance range, a high-quality wide dynamic camera is required. This can not only help the police to crack down on criminal cases, but also The evidence of the dispute occurred.
Problems to overcome with wide dynamic cameras
Although the wide dynamic technology solves the problem of ineffective imaging of the camera under severe backlighting or complex light conditions where bright and dark areas intersect, it is more prominent than ever before. However, from the perspective of development, there are also some shortcomings that accompany wide dynamic functions. . For example, the wide dynamic range of the camera, the sensitivity will decrease; in addition to the sensitivity, the wide dynamic open, the other indicators are also more or less influential, such as clarity, color reproduction, wide dynamic effect of a stable time delay. It is often seen that some wide dynamic cameras have wide dynamic effects when their wide dynamic function is turned on, but they also see blurring of the picture, deterioration of color reproduction, slowness of wide dynamic effects, and the like.
In fact, there are many factors that affect the effects of a wide dynamic camera, such as different combinations of camera chips, will have different effects. The sensor chip of the front-end camera can not determine all, and it is also related to the processing system of the later impact. In addition, the combination of CMOS firmware, if the same photosensitive chip, but if the combination of ISP or DSP, if different, wide dynamic display will be different. The firmware can be used to improve the computing performance of the ISP and enhance the image, but the most obvious difference depends on the hardware it uses.
The wide dynamic function is also related to the preset value of the camera. Each manufacturer has its own custom image imaging method, so the setting preferences in the actual application scenario are also different. Therefore, even if the manufacturer uses the same chip combination, the preset value is different and the wide dynamic performance will be different.
Some users will also worry about whether the wide dynamic features will be affected by the type of camera for the network, analog or HD-SDI. On the technical level, the camera interface does not affect the wide dynamic display, so the use of network, analog or SDI cameras does not affect the wide dynamic efficiency, the main difference depends on the camera is to use CMOS or CCD, the use of CMOS camera wide dynamic range often More extensive.
Although the development of wide dynamic technology is rapid, the low illumination point is still high and cannot be as sharp as the human eye. When the background is darker, the wide dynamic performance is worse. Most of the wide dynamic cameras need to be equipped with a backlight compensation function to improve the image capture quality of a high light difference environment.
Other limitations of wide dynamics include: limited aperture ratio and image smearing issues. Since the images are stacked one by one, the problem of image smearing is always inevitable when the objects are moved. This is the reason why only a few leading brands can meet the needs of users.
Always wide dynamic cameras have different requirements in each application. In different environments, the effect of wide dynamic camera is also affected. There are still many obstacles to overcome in order to achieve high-definition applications for wide dynamic cameras.
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