对给定的多幅图片先进行训练分类，并进行频率分析，对于测试的图像与训练图像进行频率做差，求其最小的差值所对应的训练图像，就实现了图形识别。-For a given number of pictures first training classification, and frequency analysis, for the test image and training images to do the frequency difference, find the minimum difference corresponding to the training image, to achieve the pattern recognition.