2. The horizontal pixel width of the license plate is between 120-160 pixels;
(For 720*576, for example, when the width of the license plate in the picture is one-sixth, it is 120 pixels, and when it is a quarter, it is 180 pixels. When the camera is adjusted, the width of the license plate in the picture should be one-sixth. Between a quarter and a quarter, adjust the camera to adjust the distance first so that the width of the license plate in the picture is moderate, and then adjust the focus to make the picture as clear as possible.)
3. The license plate should be as horizontal as possible, and both sides of the license plate should be as vertical as possible.
(The recognition principle of the license plate is as described above, so it is very important for the license plate to remain horizontal in the picture. Both sides of the license plate should be perpendicular to the horizontal plane so that the recognition rate can reach the highest.)
4. License plate imaging is clear, high contrast, no stain, good character separation, no adhesion 5. First draw the recognition area and then adjust the camera according to the requirements. The picture below is the standard. The first yellow line near the camera should be at the bottom of the screen, slightly tilted from the lower left corner to the upper right (because the camera and the recognition zone form At a certain angle, try to make the width of the license plate in the picture at 160 pixels. Use the selected box to select the license plate in the map. The location of the current box can be displayed in the lower right corner.
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