Several issues concerning image acquisition in parking lots The parking system adopts image recognition technology to manage the vehicles. When the vehicle enters or exits, it captures one frame of images and compares them. Some identify the situation of the entire vehicle. , Including the car's license plate, models, colors, and even the driver, this is done manually; some of the captured image processing, identification of the car's license plate, can be automatically processed by the computer. In short, in the above two kinds of judgments, special requirements have been put forward for the collection of images: the image is stable and reliable.
The stable and reliable image means that the image captured by the camera has good definition and stable sensitivity when the vehicle enters or exits the parking space. The high clarity helps to identify the license plate, models and even the driver, stable sensitivity, help identify the color of the car or even the old and new car.
There is a problem with the open-air parking lot: the light outside the field is particularly strong during the day and weak at night; the indoor parking lot is illuminated by lights, and at the exit of the parking lot, the amount of light changes is also large. In addition, car lights also affect the image acquisition. Based on the special requirements of the image recognition system of the parking lot system, combined with practical engineering experience, we have fulfilled the following solutions while satisfying the technical requirements:
1, the choice of camera: Select 480TVLine, with high-speed electronic shutter (1/50 to 1/10000 seconds), AGC, BLC camera function. We recommend using Sony's SSC-DC398P, SSC-DC58AP or Panasonic's WV-CP470 or similar cameras.
2, the choice of lens: 3.5-8mm with automatic aperture lens. The best choice is Computar, Seiko and other brands. If you use a manual iris lens, when the light becomes strong, it will lead to excessive exposure of the body, when the light weakens, it will lead to lack of body exposure; image information can not be accurately identified.
3. Installation of the camera: Set the position of the camera at the upper part of the parking card, select the position of the camera and adjust the angle of the camera to minimize the backlight, and also consider the camera angle of the license plate.
4. Add a floodlight with a color temperature of 3200K above the parking card to ensure the illumination of the body and license plates to ensure the stability of the image. If you select a lamp with a color temperature lower than 3200K, the image will turn blue; if you select a lamp with a color temperature higher than 3200K, the image will turn red. Turn floodlights off when there is plenty of light, turn on floodlights when light is low, and save on electricity.
5. Make some adjustments to the distance between the lens and the shield glass. According to the slope and the length of the parking entrance lane, the distance between the lens and the shield is adjusted to determine the camera's angle of view and minimize the back light interference.
The stable and reliable image means that the image captured by the camera has good definition and stable sensitivity when the vehicle enters or exits the parking space. The high clarity helps to identify the license plate, models and even the driver, stable sensitivity, help identify the color of the car or even the old and new car.
There is a problem with the open-air parking lot: the light outside the field is particularly strong during the day and weak at night; the indoor parking lot is illuminated by lights, and at the exit of the parking lot, the amount of light changes is also large. In addition, car lights also affect the image acquisition. Based on the special requirements of the image recognition system of the parking lot system, combined with practical engineering experience, we have fulfilled the following solutions while satisfying the technical requirements:
1, the choice of camera: Select 480TVLine, with high-speed electronic shutter (1/50 to 1/10000 seconds), AGC, BLC camera function. We recommend using Sony's SSC-DC398P, SSC-DC58AP or Panasonic's WV-CP470 or similar cameras.
2, the choice of lens: 3.5-8mm with automatic aperture lens. The best choice is Computar, Seiko and other brands. If you use a manual iris lens, when the light becomes strong, it will lead to excessive exposure of the body, when the light weakens, it will lead to lack of body exposure; image information can not be accurately identified.
3. Installation of the camera: Set the position of the camera at the upper part of the parking card, select the position of the camera and adjust the angle of the camera to minimize the backlight, and also consider the camera angle of the license plate.
4. Add a floodlight with a color temperature of 3200K above the parking card to ensure the illumination of the body and license plates to ensure the stability of the image. If you select a lamp with a color temperature lower than 3200K, the image will turn blue; if you select a lamp with a color temperature higher than 3200K, the image will turn red. Turn floodlights off when there is plenty of light, turn on floodlights when light is low, and save on electricity.
5. Make some adjustments to the distance between the lens and the shield glass. According to the slope and the length of the parking entrance lane, the distance between the lens and the shield is adjusted to determine the camera's angle of view and minimize the back light interference.
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