中文说明：
自己改写并成功测试的特征提取代码，包括颜色、纹理、HOG、GIST和形状特征，代码内有详细讲解，注释，应用于图像的特征提取很有用的 关键技术 为上传方便，在此将color、texture、HOG、GIST和shape的提取代码集合在一个.m文件中，大家只需找到相应function就可找到对应的特征提取代码。
English Description：
I have rewritten and successfully tested the feature extraction code, including color, texture, hog, gist and shape features. There are detailed explanations and notes in the code. It is a very useful key technology applied to image feature extraction. For the convenience of uploading, the extraction codes of color, texture, hog, gist and shape are collected in a. M file, You just need to find the corresponding function to find the corresponding feature extraction code