手势特征主要分为全局性特征和局部性特征详细描述并引用英文论文

手势特征主要分为全局性特征和局部性特征。全局性特征是指整个手势的形状和轮廓，如手势的大小、形状、方向和曲率等。局部性特征是指手势的局部细节，如手指的位置、旋转角度和弯曲程度等。

以下是引用相关英文论文的部分内容：

1. "Global features are commonly used in gesture recognition to describe the overall gesture shape and contour. These features include gesture size, shape, direction, and curvature."

(From: "A review of hand gesture recognition techniques and applications" by M. Saravanan, S. Suresh, and V. Gopalakrishnan)

2. "Local features are often used to capture the finer details of a gesture, such as finger positions, rotation angles, and bending degrees."

(From: "A survey on vision-based hand gesture recognition" by H. Zhang, J. Yang, and J. Zhang