All the cool phones now are doing facial recognition. While that sounds like a big job, you can add face detection and recognition easily to your projects if you can support the OpenCV library ...

OpenCV C++的图像对象Mat有一个函数convertTo可以把图像数据在不同的精度类型之间来回切换比如从字节到浮点数之间来回切换。非常方便，该函数的官方说明如下： 其中参数alpha可以让数据放缩到指定的范围内，比如从字节到浮点 ...