基于神经网络的手势识别，神经网络的权重可以通过梯度下降法来学习，识别算法对上，下，合并，停止四种姿势进行识别，效果很好。-Gesture recognition based on neural network, neural network weights by gradient descent method to study, identify the algorithm to the upper and lower, merge, stop four kinds of gestures to