Whether you are a manager in the security industry, a designer, or a user of security products, you need to understand the security knowledge. Today for camera players, to explain the accumulation of frames for everyone.
In the camera, the CCD also converts the scene image into a charge to form a video signal. If the illuminance is too low, the charge generated by the shooting target on the CCD is small, and the image appears unclear or even cannot present an image. In order to solve this problem, the digital image processing technology (DSP) can now be used to solve this problem. The specific approach is to increase the exposure time of the CCD to each frame of the image on the circuit, that is, to accumulate the target micro-light photo-generated charge, which is quite similar to taking pictures with a manual shutter at night, so that the image is relatively clear. Therefore, some of them call this camera a slow shutter speed. Sometimes called digital slow open door.
In the Frame Integration Mode, photo-generated charges stored in pixels of odd-numbered lines are read out in odd-numbered fields, and photo-generated charges stored in pixels of even-numbered lines are read out in even-numbered fields, and photo-generated charge of each pixel is accumulated. The time is a frame time, ie 1/25 s. Because the photoaccumulation charge of the frame accumulation mode takes a long time, photogenerated charges in the previous field remain in the photosensitive imaging area and appear in the next field, so there is a delay of one time, and this delay will cause a decrease in the dynamic resolution.
In the field accumulation mode, the charges of two adjacent lines are added together and transferred to the vertical CCD shift register at the same time. Interlaced reading is achieved by the difference in the combination of additive charges. The photocharge accumulation time of each pixel is a time, ie 1/50s. Therefore, the characteristics of the field accumulation method are: (1) there is no one-time delay; (2) the flicker of the vertical edges of the image is reduced; (3) the wide dynamic range and resistance to dispersion are good; (4) the vertical resolution is slightly There is a decrease.
Whether it is frame accumulation or field accumulation, because the exposure time of the CCD is prolonged, although the image is relatively clear, the real-time nature of the image change is affected, that is, when the photographed target moves quickly, there will be tailing phenomenon. The image also appears as an animation effect.
In the camera, the CCD also converts the scene image into a charge to form a video signal. If the illuminance is too low, the charge generated by the shooting target on the CCD is small, and the image appears unclear or even cannot present an image. In order to solve this problem, the digital image processing technology (DSP) can now be used to solve this problem. The specific approach is to increase the exposure time of the CCD to each frame of the image on the circuit, that is, to accumulate the target micro-light photo-generated charge, which is quite similar to taking pictures with a manual shutter at night, so that the image is relatively clear. Therefore, some of them call this camera a slow shutter speed. Sometimes called digital slow open door.
In the Frame Integration Mode, photo-generated charges stored in pixels of odd-numbered lines are read out in odd-numbered fields, and photo-generated charges stored in pixels of even-numbered lines are read out in even-numbered fields, and photo-generated charge of each pixel is accumulated. The time is a frame time, ie 1/25 s. Because the photoaccumulation charge of the frame accumulation mode takes a long time, photogenerated charges in the previous field remain in the photosensitive imaging area and appear in the next field, so there is a delay of one time, and this delay will cause a decrease in the dynamic resolution.
In the field accumulation mode, the charges of two adjacent lines are added together and transferred to the vertical CCD shift register at the same time. Interlaced reading is achieved by the difference in the combination of additive charges. The photocharge accumulation time of each pixel is a time, ie 1/50s. Therefore, the characteristics of the field accumulation method are: (1) there is no one-time delay; (2) the flicker of the vertical edges of the image is reduced; (3) the wide dynamic range and resistance to dispersion are good; (4) the vertical resolution is slightly There is a decrease.
Whether it is frame accumulation or field accumulation, because the exposure time of the CCD is prolonged, although the image is relatively clear, the real-time nature of the image change is affected, that is, when the photographed target moves quickly, there will be tailing phenomenon. The image also appears as an animation effect.
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