基于条纹投影的苹果果梗/花萼识别方法

为避免苹果果梗/花萼区域对表面缺陷检测造成干扰,提出一种苹果果梗/花萼识别方法.首先,利用相移条纹投影技术,通过数学变换思想模拟多角度下参考平面的偏转相位,将苹果的绝对相位减去参考平面的偏转相位,获得多角度下苹果的相位高度图;然后,根据果梗/花萼区域的凹形特征,利用灰度形态学算法对相位高度图进行填充,获得相位填充图;最...

Apple stem/calyx recognition based on fringe projection

To avoid the interference of apple stem/calyx area on its surface defect detection, an apple stem/calyx recognition method is proposed in the present assay. Firstly, by taking use of phase-shifting fringe projection technology, the deflection phases of the reference plane under multiple angles are simulated with mathematical transformation. Secondly, the phase-height images under multiple angles are obtained by subtracting the deflection phases from the absolute phase of the apple. Based on the concavity characteristic of the stem/calyx, the phase-height images are filled with morphological grayscale algorithm to obtain the phase filled images. Finally, the phase difference images are computed by subtracting the phase-height images from the phase filled images, then the stem/calyx area can be accurately located through threshold segmentation. The experimental results demonstrate that the proposed method can effectively recognize the stem/calyx area of apple at different positions, and has good robustness and applicability with the recognition accuracy of 97.33%.