Backlight compensation, also known as backlight compensation, divides the picture into several different areas, each of which is exposed separately. In some applications, the field of view may contain a very bright area, and the included subject is surrounded by a bright field. The picture is dark and has no hierarchy. Since the signal level detected by the AGC is not low at this time, the gain of the amplifier is very low, and the brightness of the screen body cannot be improved. When the backlight compensation is introduced, the camera only detects one subfield of the entire field of view. The average signal level of this area determines the operating point of the AGC circuit.
Overview
Backlight compensation can provide ideal exposure of the target in front of very strong background light, regardless of whether the main target moves to the middle, up, down, left or right, or anywhere on the screen.
Backlight compensation is also called backlight compensation or backlight compensation, which can effectively compensate for the darkness of the subject when the camera is shooting in a backlight environment.
When the camera is photographed in a backlit environment, a black image appears on the screen. However, the backlight environment is difficult to avoid in security. At this time, backlight compensation is required. When the backlight compensation function is introduced, if the camera detects that the video level in a region of the captured image is relatively low, the AGC circuit described above improves and enhances the video level in the region, and increases the amplitude of the output video signal, so that the entire image. Clear and bright. If the subject you want to see appears dim due to the bright background, you can set BLC to ON to compensate for the strong backlight.
To put it simply, it is in a weak light environment and in a dark background, a clearer picture can be obtained.
Backlight compensation can provide ideal exposure of the target in front of very strong background light, regardless of whether the main target moves to the middle, up, down, left or right, or anywhere on the screen. That is, the object that can see the back light, but the things behind the object are not clear.
An ordinary camera that does not have super dynamic characteristics only has a shutter speed of 1/60 seconds and F2.0 aperture selection, but a very bright background behind a main target or a point light source is unavoidable and the camera will acquire It is not a good idea to average all the incoming lights and determine the exposure level, because when the shutter speed increases, the aperture will be closed causing the main target to become too dark to be seen. To overcome this problem, a method called backlight compensation is widely used on most cameras through a weighted area theory. The image is first divided into 7 blocks or 6 areas (two areas are repeated). Each area can be independently weighted to calculate the exposure level. For example, the middle part can be added to the rest of the block by 9 times, so one is in the middle of the frame. The goal of the location can be seen very clearly, because the exposure is mainly calculated with reference to the light level in the middle area. However, there is a very big flaw. If the main target moves from the middle to the top, bottom, left and right of the screen, the target will become very dark, because now it is not differentiated and has not been weighted.
Overview
Backlight compensation can provide ideal exposure of the target in front of very strong background light, regardless of whether the main target moves to the middle, up, down, left or right, or anywhere on the screen.
Backlight compensation is also called backlight compensation or backlight compensation, which can effectively compensate for the darkness of the subject when the camera is shooting in a backlight environment.
When the camera is photographed in a backlit environment, a black image appears on the screen. However, the backlight environment is difficult to avoid in security. At this time, backlight compensation is required. When the backlight compensation function is introduced, if the camera detects that the video level in a region of the captured image is relatively low, the AGC circuit described above improves and enhances the video level in the region, and increases the amplitude of the output video signal, so that the entire image. Clear and bright. If the subject you want to see appears dim due to the bright background, you can set BLC to ON to compensate for the strong backlight.
To put it simply, it is in a weak light environment and in a dark background, a clearer picture can be obtained.
Backlight compensation can provide ideal exposure of the target in front of very strong background light, regardless of whether the main target moves to the middle, up, down, left or right, or anywhere on the screen. That is, the object that can see the back light, but the things behind the object are not clear.
An ordinary camera that does not have super dynamic characteristics only has a shutter speed of 1/60 seconds and F2.0 aperture selection, but a very bright background behind a main target or a point light source is unavoidable and the camera will acquire It is not a good idea to average all the incoming lights and determine the exposure level, because when the shutter speed increases, the aperture will be closed causing the main target to become too dark to be seen. To overcome this problem, a method called backlight compensation is widely used on most cameras through a weighted area theory. The image is first divided into 7 blocks or 6 areas (two areas are repeated). Each area can be independently weighted to calculate the exposure level. For example, the middle part can be added to the rest of the block by 9 times, so one is in the middle of the frame. The goal of the location can be seen very clearly, because the exposure is mainly calculated with reference to the light level in the middle area. However, there is a very big flaw. If the main target moves from the middle to the top, bottom, left and right of the screen, the target will become very dark, because now it is not differentiated and has not been weighted.
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