基于CCD的航空相机自动检焦系统

要使航空相机获得高质量的图像，必须保证镜头的焦距和实际成像面的位置符合技术要求。提出了一种自动检测航空相机焦距和是否离焦（实际成像面的位置是否在焦深范围内）的系统，论述了系统的工作原理、硬件组成和软件设计。该系统采用平行光管产生检焦信息，利用CCD摄像头作光电转换器件接收图像，采用重心法处理数据，由光电线位移传感器和光栅数显表共同作用实现摄像头轴向的精确平移，从而能够确定相机的最佳成像位置和图像尺寸。最佳图像位置用来判断是否离焦，最佳图像尺寸用来计算焦距。使用该系统对航空相机镜头焦距的检测准确率达到99.87%、是否离焦的判断与试飞结果完全相同。

Auto-focusing System Based on CCD Aerial Cameras

To get images of high quality with aerial camera,the focus of the lens and the situation of the real image plane must accord with the technical standards. A system is put forward which can automatically measure focus and estimate whether the aerial camera is off-focus and the situation of the real image plane is in the focus plane range or not. The work principle,the hardware composition and the software design are discussed in detail. The system acquires examining-focus information with collimator,receives...