用于数码相机的瞳孔控制自动对焦技术

Pupil-controlled auto-focusing technique used in digital cameras

对焦窗口的选择是数码相机进行自动对焦的关键问题之一。现有的对焦窗口的选择方法过于简单,由于成像目标的复杂性,有必要使对焦窗口的选择本身实现自动化和智能化[1]。提出了一种利用数字图像处理来进行瞳孔控制自动对焦的方法。对现有照相机结构稍加改进后,可以利用数码相机中现有的CCD/CMOS图像传感器获取拍摄者眼睛的图像,再通过对拍摄者眼睛的图像进行处理来判断其瞳孔在眼睛中的位置。根据这一位置信息,可以推断拍摄者的注意力所集中的区域,从而对焦窗口的自动选择。

Selecting focus windows is one of the key problems in realizing autofocus in digital cameras. The current methods to select focus windows are too simple, and it's necessary to make the selecting process roboticized and intelligent since the imagng objects are so complicated. An autofocusing technique based on pupil tracking utilizing digital image processing is proposed. After making a small change on the current digital cameras, where CCD/CMOS image detectors available, it's feasible to take images of pupils of photographers. Then pupils' position is calculated following threshold treatment and morphological operations. According to the position information, the areas which photographers' are interested in are decided so that focus windows can be selected automatically.