Authors

Abstract

To study the types of mechanical damage for castor seeds and their effects on germination, the image processing method was applied to detect the damage affecting germination. Two typical varieties of castor were selected for test. The type of mechanical damage of castor seeds was taken as the factor, the germination rate and germination vigor index were selected as indicators for one-way analysis of variance. The effects of mechanical damage on the germination of castor seeds were analyzed. Different algorithms were applied to extract the features of cracks and seed shell missing, and the corresponding defect parameters were calculated. The results showed that the effects of mechanical damage on the germination rate, germination potential, germination index, and vigor index of castor seeds were significant. The endosperm damage seriously affected the activity of castor seeds and seriously hindered seed germination. According to the analysis of the shell, some castor seeds cracked or there was incomplete shell damage at the same time, the internal endosperm being also damaged. The actual crack length was compared with the length measured by the ultra-depth of field microscope, which found that the margin of error was about 25% and the better error was 10%. Through the morphological processing, it could completely extract the characteristics of castor seed image without seed shells. The error between the extracted feature area and the measured object area function of the super depth of field microscope is about 10%.

Abstract in Chinese

为了研究蓖麻种子机械损伤类型及其对发芽的影响，并通过图像处理手段对损伤进行检测。选用通辽农科院主栽的通蓖9号和哲蓖4号为试验材料，以蓖麻种子机械损伤类型为因素，以发芽率、发芽势、活力指数等为指标做单因素方差分析，分析机械损伤对蓖麻种子发芽的影响。最后通过不同算法对裂纹与种壳缺失进行特征提取，并计算相应的缺陷参数。研究结果表明，机械损伤对蓖麻种子的发芽率、发芽势、发芽指数及活力指数影响显著；发芽实验6天后，不同损伤类型蓖麻种子的发芽率与完整蓖麻种子发芽率相比均明显降低，种壳损伤蓖麻种子发芽指数相对较高，活性也相对较高，80%左右的胚乳损伤蓖麻种子不能发芽，胚乳损伤严重影响蓖麻种子的活性，严重阻碍种子发芽；根据去壳分析，部分蓖麻种子产生裂纹或者种壳不完全损伤的同时，内部胚乳也产生了损伤，从而导致它们与完整蓖麻种子之间发芽率差异显著。将检测实际裂纹长度与超景深显微镜测量长度比较，可以看出误差范围基为25%，比较优异的误差为10%。通过最大类间方差法对种壳缺失的蓖麻种子进行图像分割，并通过形态学处理后，能将种壳缺失蓖麻种子图像的特征完全提取出来，提取到的特征面积与超景深显微镜的实测物体面积功能的误差为10%。