Research on multi-channel scenario projector and its application in testing of license plate recognition cameras

A device is built to create virtual scenarios to realize intelligent perceptual tests of machine vision. The device consists of multiple projectors and uses light field superposition to build a multi-channel scenario projector, based on which any application scenario can be virtually reproduced on a two-dimensional plane. Currently, the device can cover 430~700 nm, and the effective number of controllable pixels is more than 1 million. We perform spectral segmentation of different channels, which can enhance the freedom of spectral combination for 2D scene reproduction. The application of the above multi-channel projector for intelligent perception is investigated using number plate character recognition as a case study. An image dataset of license plate character recognition for testing and evaluation was designed, and experiments on license plate character perception were carried out to demonstrate the application of the multi-channel projector in intelligent perception. The multi-channel projector-based test device and the basic test procedure, with reasonable scene matching and customization, can be used for testing and evaluating the intelligent perception performance of machine vision systems in a variety of scenes.