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评价照相系统细部的还原能力是一个相当复杂的课题,历史上沿用的解象力测定方法越来越不能反映实际情况。虽然发展了测边缘梯度的锐度以及测量扩散距离的K值,以弥补解象力的不足,但都有局限性。直到信息理论应用于照相系统,才稍为满意地解决了这一问题。照相系统可看作一种传递信息的通道,信息的通过能力就是传递函数。传递函数既有坚实的理论基础,在实用上又能预估还原的细部影象质量,因此是一个比较完善地评价照相系统细部还原能力的方法。
It is a rather complicated topic to evaluate the detail ability of restoration of the camera system. The method of measuring the resolution of the imagination used in history can not reflect the actual situation more and more. Although the development of measuring the sharpness of the edge gradient and measuring the spread of the value of K to make up for the lack of resolution, but there are limitations. Until the information theory applied to the camera system, only a little satisfied with the solution to this problem. A camera system can be thought of as a pass-through channel, and the ability to pass information is a transfer function. Transfer function has a solid theoretical foundation, in fact, can predict the reduction of detailed image quality, so it is a more perfect evaluation of the ability of the camera system to restore the detailed method.