虾夷扇贝定向检测方法研究

吊耳法养殖虾夷扇贝需要在钻孔前将扇贝按同一姿势排成一列.机械定向方法易使扇贝受到振动、碰撞和边缘磨损.造成病贝、死贝.为此提出了一种新的方法,利用机器视觉识别扇贝耳部朝向.通过摄像头获取扇贝图像,采用计算机对输入图像进行预处理、图像分割,提取扇贝特征参数.通过轮廓提取、改进的随机Hough变换检测背缘线,进一步根据背缘与形心的相对位置,确定扇贝耳部朝向.试验表明,该方法检测速度快,正确率高,能够满足虾夷扇贝定向要求.摄像头与扇贝不接触.可以避免机械振动、碰撞对扇贝的损伤.

Study on detecting method of scallop direction guiding

Scallop (Patinopecten yessoensis) culturing by ear-hanging method demands drilling hole on the ear for which an equipment for automatic in-line positioning and posturing of the scallop shell is required. Normally, scallop is undergoing vibrating, bumping and wearing when it is touching the mechanical parts for orienting, which will cause the diseases or death. A novel method for ear-orienting recognizing of the scallop shell is developed based on machine vision. Images taken by digital camera are preprocessed and segmented automatically by a computer to get scallop feature parameters. Back-edge is detected through contour-extracting and enhanced random Hough-transform. And the ear-orient is confirmed by analyzing the relative positions of back-edge and center of gravity. The results show that the new method can do the ear-orienting work both rapidly and accurately without vibrating, bumping and damage because of touch-free between camera and scallop.