模式识别的一些预处理，包括：图像压缩的例子：行程编码算法RCL， 手写体数据变换成像素位图的算法。-some pretreatment pattern recognition, including : Image Compression examples : RCL itinerary coding algorithm, handwritten data transformation into pixel bitmap algorithm.

The bitmap header begins with the size of the header, which is then followed by the width and the height of the image data. If the height is a negative number, the image is stored from bottom to up. Usually the number of color planes is one.