针对视觉字典的最佳表示方式、图像分类任务中亟需计算效率高、存储代价小、分类准确度高的算法等难题，提出了几种创新的算法。-Aiming at the problem of the best representation of visual dictionary and the need of high efficiency, low memory cost and high classification accuracy in image classification task, several innovative algorithms are proposed.