4.5 Card Recognition

4.5.1 Algorithm

It can identify whether there are corresponding traffic cards in the image. If yes, it will return information including the coordinates, size, and label values of the cards.

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4.5.2 Classification Label

Label	Definition	Pic
1	go forward
2	turn left
3	turn right
4	turn around
5	stop

Note: The algorithm can only recognize one card at a time. The card can still be recognized within a certain rotation, deflection and pitch angle. When using, please make the card face the camera as directly as possible for better recognition.

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4.5.3 Test Code

1. In the code start-up, set the serial port baud rate to 9600, and then set the communication mode of the AI vision module to I2C, and finally set it to run in Card mode.

2. The if block determines the number of detections. Only when the number of detections is greater than 0 will the data be output. Note to choose Card.

3. The serial port prints the recognized card data.

Complete code:

4.5.4 Test Result

After uploading the code, the AI vision module will scan the area captured by the camera. If there is a card, it will be recognized and its coordinate(x, y), width(w), height(h) and label value will be printed in the serial monitor.