Sports Training Aid Using Image Processing

开发了羽毛球和网球场上运动员位置检测系统，并对运动员的运动进行了分析。第一个系统可以通过使用DSP的接口实时检测玩家位置。职位信息被传送到个人电脑上。首先，由设置在球场上方的相机拍摄的图像被没有任何球员的球场图像减去。使用合适的过滤器检测玩家位置。起初，羽毛球等室内运动是主要目标，但该系统通过引入背景更新算法进行了升级，从而可以用于网球等场地亮度随天气变化的室外运动。文中还介绍了一种降噪滤波器和一种去除看似错误的火焰的算法。系统可处理7 - 8火焰/秒128×128像素图像。通过反馈球员的位置和动作信息，提高训练效果。第二种系统处理更高的分辨率…更多的360×240以牺牲实时性为代价，所有的处理都是由PC上的软件执行的。在这种情况下，差分图像中的每个像素被量化为二值数并进行标记，从而去除噪声成分。将球员图像重心周围的正方形区域作为初始模板，在接下来的火焰中通过模板匹配更新。使用这些系统跟踪羽毛球单打和双打的初学者和专家。结果表明，单打能手的前后移动速度较快，左右移动无显著性差异；双打能手的左右移动速度较快，前后移动无显著性差异。初学者和专家的平均位置也不同。这些结果提示了初学者练习的要点。血乳酸对总距离和平均速度有较大的影响，表明痕量分析可以估计血乳酸含量。少

Two systems to detect the position of player in a badminton or tennis court are developed and player movement is analyzed.The first system can detect player position in real time using an interface using a DSP.Position information is transferred to a personal computer. First an image taken by a camera which is set above the court is subtracted by an image of the court without any players. The player position is detected using a suitable filter. At first indoor games such as badminton is the main target, but the system is upgraded by introducing a background updating algorithm so that it can be used for outdoor games like tennis where the court brightness varies depending on the weather. A noise reduction filter and an algorithm to discard flames which seem to be erroneous are also introduced. The system can process 7 to 8 flames/sec of 128×128 pixel images. Training can be improved by feedback of position and movement information of the player.The second system handles higher resolutio … More n of 360×240 at the expense of real-time property, and all the processing is performed by software on a PC.In this case each pixel in the difference image is quantized to binary number and labeled so as to remove noise component. Square area around the center of gravity of the player image is taken as an initial template, which is updated in the following flames by the template matching.Using these systems traces of beginners and experts in badminton singles and doubles. It is charified that, in the singles experts move faster in forward-backward direction and no significant difference in left-right movement, while in the doubles experts move faster in left-right direction and no significant difference in forward-backward movement. Average position also differs between beginners and experts. These results suggest the important points for beginners to practice.Blood lactate is shown to have strong influence on total distance and mean velocity, which suggests the possibility that the trace analysis can estimate the blood lactate. Less