**Camera Adjustment Guidelines**
1. The image resolution can range from 720*576 to 3000*3000. Ensure that the image width is divisible by 4 for optimal processing.
2. The horizontal pixel width of the license plate should be between 120 and 160 pixels. For example, in a 720*576 image, if the license plate occupies one-sixth of the width, it will be approximately 120 pixels wide. If it occupies a quarter, it would be around 180 pixels. When adjusting the camera, aim for the license plate to be about one-sixth of the image width. If the size is too large or too small, first adjust the distance to get it within the acceptable range, then fine-tune the focus to ensure the image is as clear as possible.
3. The license plate should be as horizontal as possible, with both sides nearly vertical. This is crucial because the recognition algorithm relies on the plate being level and aligned properly. If the sides are not perpendicular to the horizontal plane, the recognition accuracy may decrease significantly.
4. The image must be clear, with high contrast, no stains, good character separation, and no overlapping or blurred characters.
5. Before adjusting the camera, define the recognition area. Once set, adjust the camera accordingly. The image below shows the standard setup. The first yellow line near the camera should appear at the bottom of the screen, slightly tilted from the lower left to the upper right (due to the angle between the camera and the recognition zone). Try to make the license plate’s width in the image around 160 pixels. Use the selection box to outline the license plate in the image. The current position of the box will be displayed in the lower right corner for reference.
These guidelines help ensure accurate and reliable license plate recognition. Always double-check the settings before finalizing the camera configuration.
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As a global leader in architectural hardware solutions, we specialize in the full-cycle development, precision manufacturing, and international distribution of premium-grade Crystal Roller Shutter Doors. Our vertically integrated operation combines R&D innovation with ISO 9001-certified production, delivering products that meet EN 13241-1 safety standards and CE certification requirements.
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Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hongfadoor.com