这次上传的代码是关于几种常用特征提取方法的对比代码。

用GDI函数抓屏 如果我们不太在意抓屏的效率，并且我们想要的只是一个屏幕快照的话，可以考虑使用GDI方式。这种抓屏机制是以“桌面也是一个窗口，桌面也有一个窗口句柄（HWND）”这个简单的常识为基础的，如果我们得到了桌面的设备上下文（DC），就可以利用blit（复制）它的内容到我们创建的DC中。我们可以用GetDeskWindow（）得到桌面的窗口句柄，从句柄得到DC也是很容易的 -GDI function with screenshots screenshots if we do not care about efficiency, and we want only a snapshot of the screen, you can consider using GDI mode. This mechanism is based on the screenshots Desktop is also a window, the desktop also has a window handle (HWND) This simple knowledge-based, if we get the desktop device context (DC), can be used on the blit (copy) its contents that we created in DC. We can use GetDeskWindow () get desktop window handle from the handle to get DC is also very easy

Stanford 大学教授Andrew  Ng公开课UFLDL之自编码器练习，经过本人完成的代码，与Andrew  Ng的预期结果完全一致，并且，其中已经进行了矢量化编程，程序运行效率很高；训练数据集、第三方优化代码也含在压缩包中，相信对深度学习的初学者，必定有较大帮助。

一款用vc++编写的画图软件，本软件提供了画一些基本图形的功能，还有将图形进行填充。-vc with one prepared by the drawing software, the software provides a graphic pictures of some of the basic functions, there will be graphics for filling.

已在vs2013环境下编译通过，实现了8个方向4个频率的特征提取。Main函数的路径要修改一下才能运行

用C语言编写一个焰火程序-C language a fireworks procedures

vc编的图形学里的zbuffer算法，可以参考下做法-vc-series graphics zbuffer in the algorithm, can refer to practices under

Opengl written with a three-joint robot arm program3

java的图像处理程序,很简单的,很实用-java image processing is very simple and very practical

动态缩略图生成类，可方便生成图片缩略图，只生成一次-Class to generate dynamic thumbnails, image thumbnails can be easily generated, only to generate a

png图像格式转bmp的源代码-png image bmp format to the source code