Analysis of the Plantar Pressure Distribution and Tracing of the Plantar Contour Using Image Processing

• Main Authors: Yi-ting Tseng, 曾怡婷
• Other Authors: Kuen-hsieh Tsai
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/89717456227235410743

碩士 === 逢甲大學 === 紡織工程所 === 96 === In this research the plantar image acquired by a low-cost, portable and easy handling "Harris and Beath footprinting mat" is applied for analysis of the plantar pressure distribution and tracing of the plantar contour using image processing. In analysis of the plantar pressure distribution, the Kittler & Illingworth threshold method and image smoothing are applied on the plantar image to obtain a smooth distribution of gray levels. Then the relationship between the gray levels and the pressure values is constructed through experiments, and the gray levels of the smoothed plantar image are transformed into pressure value pixel by pixel and the plantar center of pressure is located. In addition, those pressure values are expressed with colors on an image so as to show the plantar pressure distribution clearly. In tracing of the plantar contour the contrast of the plantar image is first increased and then smoothed. The snake with the attraction and even distance energy is applied for tracing of the plantar contour by setting the initial snake curve close to the edge of the plantar contour. Moreover, the arch index, the Chippaux-Smirak index, foot length and foot width are further calculated. The experimental results show that through the process mentioned above the plantar pressure distribution and the plantar center of pressure can be accurately obtained quickly. By using those information the foot problems can be analyzed fast and less manpower is required. On the other hand the plantar contour can be detected using the snake with the attraction and even distance energies accurately. With the plantar contour detected the footprint parameters including the arch index and the Chippaux-Smirak index, foot length and foot width can be evaluated. Those footprint parameters can be used to analyze the foot problems, and foot length and foot width can be applied on checking shoe last so as to find appropriate shoes.