An experimental method of measuring the real contact area of transparent blocks based on the principle of total internal reflection is presented, intending to support the investigation of friction characteristics, hea...An experimental method of measuring the real contact area of transparent blocks based on the principle of total internal reflection is presented, intending to support the investigation of friction characteristics, heat conduction, and energy dissipation at the contact interface. A laser sheet illuminates the contact interface, and the transmitted laser sheet is projected onto a screen. Then the contact information is acquired from the screen by a camera. An improved Otsu method is proposed to process the data of experimental images. It can compute the threshold of the overall image and filter out all the pixels one by one. Through analyzing the experimental results, we describe the relationship between the real contact area and the positive pressure during a continuous loading process, at different loading rates, with the polymethyl methacrylate（PMMA）material. A hysteresis phenomenon in the relationship between the real contact area and the positive pressure is found and explained.展开更多
与单阈值分割相比,多阈值彩色图像分割具有更高的分割精度,对复杂的彩色图像分割有着较好的效果.但是由于阈值增多导致计算量增大,整体算法的运算时间增加.针对此问题,提出了一种改进的多元宇宙优化算法对多阈值彩色图像分割算法进行优...与单阈值分割相比,多阈值彩色图像分割具有更高的分割精度,对复杂的彩色图像分割有着较好的效果.但是由于阈值增多导致计算量增大,整体算法的运算时间增加.针对此问题,提出了一种改进的多元宇宙优化算法对多阈值彩色图像分割算法进行优化.首先,对多元宇宙优化算法进行改进,引入樽海鞘优化算法中的收敛因子,提高算法的寻优能力;然后,选取多阈值大津法作为图像分割算法,将其作为优化算法的适应度函数;最后,通过对标准数学公式的仿真实验,以及选取四幅伯克利大学图像库图像进行实验分析,实验结果表明该算法能够对图像进行精确分割,在PSNR(Peak Signal to Noise Ratio)和FSIM(Feature Similarity Index)两个指标上均优于其他算法,提高了分割精度.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.11272171)the Beijing Natural Science Foundation,China(Grant No.3132030)the Education Ministry Doctoral Fund of China(Grant No.20120002110070)
文摘An experimental method of measuring the real contact area of transparent blocks based on the principle of total internal reflection is presented, intending to support the investigation of friction characteristics, heat conduction, and energy dissipation at the contact interface. A laser sheet illuminates the contact interface, and the transmitted laser sheet is projected onto a screen. Then the contact information is acquired from the screen by a camera. An improved Otsu method is proposed to process the data of experimental images. It can compute the threshold of the overall image and filter out all the pixels one by one. Through analyzing the experimental results, we describe the relationship between the real contact area and the positive pressure during a continuous loading process, at different loading rates, with the polymethyl methacrylate（PMMA）material. A hysteresis phenomenon in the relationship between the real contact area and the positive pressure is found and explained.
文摘与单阈值分割相比,多阈值彩色图像分割具有更高的分割精度,对复杂的彩色图像分割有着较好的效果.但是由于阈值增多导致计算量增大,整体算法的运算时间增加.针对此问题,提出了一种改进的多元宇宙优化算法对多阈值彩色图像分割算法进行优化.首先,对多元宇宙优化算法进行改进,引入樽海鞘优化算法中的收敛因子,提高算法的寻优能力;然后,选取多阈值大津法作为图像分割算法,将其作为优化算法的适应度函数;最后,通过对标准数学公式的仿真实验,以及选取四幅伯克利大学图像库图像进行实验分析,实验结果表明该算法能够对图像进行精确分割,在PSNR(Peak Signal to Noise Ratio)和FSIM(Feature Similarity Index)两个指标上均优于其他算法,提高了分割精度.
