Image-free multi-character recognition
This addresses the problem of multi-target recognition in image-free sensing for applications like license plate detection, representing a novel extension beyond single-target methods.
The paper tackled the challenge of recognizing multiple targets using image-free sensing, achieving 87.60% recognition accuracy at a 5% sampling rate with over 100 FPS in license plate detection.
The recently developed image-free sensing technique maintains the advantages of both the light hardware and software, which has been applied in simple target classification and motion tracking. In practical applications, however, there usually exist multiple targets in the field of view, where existing trials fail to produce multi-semantic information. In this letter, we report a novel image-free sensing technique to tackle the multi-target recognition challenge for the first time. Different from the convolutional layer stack of image-free single-pixel networks, the reported CRNN network utilities the bidirectional LSTM architecture to predict the distribution of multiple characters simultaneously. The framework enables to capture the long-range dependencies, providing a high recognition accuracy of multiple characters. We demonstrated the technique's effectiveness in license plate detection, which achieved 87.60% recognition accuracy at a 5% sampling rate with a higher than 100 FPS refresh rate.