摘要
研究了物距(即手掌与镜头之间的移动范围)与成像清晰度的关系,从而可以根据掌纹识别精度确定在超出景深范围情况下的手掌与镜头之间的可移动范围。通过三种基于梯度的清晰度与物距实验结果发现,三种清晰度评价值与物距均成单调单值非线性关系且曲线靠近。以此可以推论,各种梯度清晰度评价函数在与物距的关系表述上没有明显差异。
The paper discussed the relationship between object distance（moving range between palm and camera lens）and image definition,thus ascertain the moving range between palm and camera lens when object distance beyond the scope of the depth of field on the basis of palmprint identification accuracy.Through three kind of experimental results about clarity based on gradient and object distance,it is found that clarity evaluation function and object distance show monotone,single-valued and non-linear relation and the curves are in close to each other.So,it is deducted that it is no significant difference on relationship expression between the clarity evaluation function based on gradient and object distance.
出处
《微型机与应用》
2011年第8期36-38,共3页
Microcomputer & Its Applications
基金
国家自然科学基金(60972123)
关键词
图像处理
清晰度评价
拍摄距离
数学模型
image processing
image definition
shooting distance
the mathematical models
