3D shape measurement with an uncalibrated camera using the feature quantity type whole-space tabulation method

A prototype of a 3D shape measurement device with two cameras was developed, and the prototype was used to confirm the effectiveness of the 3D shape measurement method that does not require camera parameters. For 3D shape measurement using a fringe projection method, generally the pixel coordinate in the image and phase information of the projected fringe pattern are used; however, 3D coordinates can be obtained from only three fringe phase values. Recently, authors proposed this method as a feature quantity type whole-space tabulation method. There were no camera parameters required because pixel coordinates were not used, and thus a camera calibration-free 3D shape measurement can be realized. Moreover, the experimental evaluation was performed using the prototype having two cameras. Although these cameras were located at different positions and had lenses with different focal lengths, their measured shapes of an object were almost identical. An experiment of 3D shape measurement using an uncalibrated camera was performed. The effectiveness of the proposed method was quantitatively validated from experimental result obtained using the developed prototype.