Abstract
We proposed the recognition system of road signpost by image processing. At first, in the preprocessing, the red color is extracted from the input image using color chart. Secondly, the ring detection network specifies the scale and position of the circular ring by scanning the input image. The figure pattern is cut out and reconstructed using interpolation method, assumed to consist of 8 length and 5 dots. A digital expression of the template and the image is changed -1, 0, +1. set by the experiment, and we experiment on the performance of ring detection network based on it. The recognition experiment on 100 pieces was done for three kinds of speed limit signs 30 km/h, 40 km/h, and 50 km/h. The detection rate was about 100% in all cases. The recognition rate was 98.3%. This network is possible to detect the other types of shape, using other template. The application can be expected of many fields of the image processing. Moreover, these processes are carried out using networks by many connecting weights. These results suggests in apprication of parallel hierarchical structure in hardware system, and is able to realize real time processing.
