3D model reconstruction with adjustable colors and resolution light source based on regions of interest

• Main Authors: Yu-yaw Chang, 張譽耀
• Other Authors: Chi-fa Chen
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/05500363824373230984

碩士 === 義守大學 === 電機工程學系碩士班 === 96 === In recent years, the progress in integrated technology has caused the improvement of 3D data acquisition system using the optical, mechanical and electrical components. In order to further improve the previous structured light technology using simple patterns and limited resolution as well as to avoid the vibration problem caused by the mechanical action during the measuring process, a computer controlled color projector is used to measure the region of interest of the 3D objects in this research. Based on the colors and complexity of the object surface, the color and resolution of the projected structured light patterns are adaptively adjusted without the introduction of mechanical action. A threshold value for depth variance is set in the iteration steps to change the color and resolution of the projected patterns, and form a closed loop 3D objects measurement system. First of all, we obtain camera focal length f parameter and assess parameter influence in the triangular measure method for calculating the coordinates of 3D objects, establish the angle-pixel table, and then use interpolation method to expand the effective range of the table. In the experimental examples, we use the color checker and magic box to show the ambiguous situations of colors existing in the camera images, and determine the position of pixels in the projected image. The coordinates of 3D objects can be calculated from projected images by using triangular measure method. The complete 360˚ depth data of 3D objects can be obtained using a turn table, in which the color and resolution of surface information of the object become more and more clearly and finely, so as to achieve the precise high-resolution 3D surface information of objects.