一种基于图像处理的舌象采集自动调焦算法

为快速准确地采集到清晰的舌图像,必需智能调整并控制摄像镜头与舌体的位置。提出了影响图像质量的因素,如清晰度、反光比、对中性、阴影比、光照条件、焦距等,以及在调整镜物位置时用到的调焦的方法,并与调焦技术相结合,建立了适合图像质量与镜物距离之间关系的数学模型。自动对焦的过程就是运用爬山搜索算法求取对焦评价函数最大值的过程。传统的爬山搜索算法会受到对焦评价函数局部极值的干扰而不能准确对焦,本研究对每一帧图像先进行预处理,然后采用先粗后精两步法,有效地排除了这种干扰。用VC++6.0编程实现了自动调整采集设备获取质量最佳图片的过程。试验结果表明此方法具有快速、抗干扰强、精确等特性。

An auto-focus algorithm for tongue image acquisition based on image processing

To rapidly and accurately acquire a clear tongue image needs adjusting and controlling of the distance between camera and the tongue.This study elaborated the factors that influence image quality such as clarity,light reflection,shade,illumination condition and focal length and the focusing method used in adjusting the position of lens and subject.Combined with focus technology,this paper established a mathematical model of the relation of image quality and distance of lens and subject.The procedure of auto...