【摘要】 为寻找荔枝冠层光合有效辐射模拟中合适的叶片旋转算法,实验针对树叶灰度图像,将双线性插值算法引入图像旋转中,并与采用最邻近插值算法的结果进行对比分析,着重比较了树叶与背景之间边缘的过渡情况和二值化后树叶所占面积的变化情况。结果表明,采用双线性插值算法目标与背景之间的过渡平滑,边界清晰,旋转后的图像清晰度较高;采用最邻近插值算法目标与背景之间的过渡不平滑,有比较严重的方块效应,图像整体清晰度较差,二值化后图像的平均变形达到20个像素。更多还原

【Abstract】 The purpose of this experiment was to find a suitable algorithm for leaf rotation in the Litchi canopy PAR (Photosynthetically Active Radiation) simulation. Bilinear interpolation algorithm was introduced to the rotation of leaf gray pictures in this study. Pictures were also rotated with the nearest interpolation algorithm for comparison. Results were analyzed emphasizing the transition of the borderline and ratio of target area in the binary image. It showed that in the rotated images, when using the bilinear interpolation algorithm, the transition between target and background was smooth, the borderline was clear and the definition of the whole image was satisfying. By using the nearest interpolation algorithm, the definition of the rotated image was not so satisfying that there were diamond effects on the borderline of target and background. It also showed that there was a distortion of 20 pixels in binary image for average when using nearest interpolation algorithm.更多还原