Visualization of the Workpieces on the CNC Machines Using the Virtual Camera Based on the Sub-Pixel IBR Method

Abstract

One of the results of the dynamic progress in the field of industrial and applied computer science and mechatronics is the growing interest in usage of the machine vision algorithms and systems. One of such areas of applications is the positioning of the workpieces on the CNC machines based on the image analysis, allowing also the visualization of the workpiece observed from an arbitrary viewpoint located between two or more cameras. Such virtual camera can be effectively implemented using Image Based Rendering technology [ but one of its limitations is the necessity of using the depth maps, which have to be acquired for each reference image. It can be done using the additional fringe patterns projector, similarly as in typical 3D scanning systems or using some other approaches e.g. stereovision. Nevertheless, the quality of images obtained using the typical IBR method is limited by the missing pixels (holes), which should be filled using splatting algorithm, which typically cause the noticeable blurring of obtained image. The solution proposed and discussed in this paper is based on the sub-pixel IBR method with additional filtering and interpolation of the points acquired from the reference cameras allowing increasing the quality of the final images obtained as the visualization of the positioned workpieces.

Archives of Metallurgy and Materials

“…Geometry measurements using this method are based on the determination of differences in the position of the object points registered on both images. In order to increase the accuracy of the measurement of stereovision geometry, a projector illuminating the object with structural light is often added to the camera system [17,18]. An example of a commercial solution for such measuring system can be the ATOS system [19].…”

Intelligent Machine Tool: New Manual Programming Techniques

“…3) is used for measuring force in the X and Y axes, i.e. on the plane, and is equipped with function keys (2)(3)(4) taking part in the programming process, as well as with a safety button (1), the deliberate or emergency release of which causes an immediate stop of the drives. The lever enables the precise movement of the table.…”

“…The lever enables the precise movement of the table. To move the table very slowly and carefully, it is necessary to press button (2). Discrete sliding of the table by 0.001mm is possible owing to a discrete mini joystick indicated in the picture with number (7.)…”

Combining the Technology of Long-Range Laser 3D Scanners and Structured Light Handheld 3D Scanners to Digitize Large-sized Objects

“…Among others, they are applied by reverse engineering [1]. We have been also noticing some attempts to use them in the precise positioning of complex-shaped objects in the working space of a machine tool or welding machine to improve or automate the process [2,3,4]. 3D scanners may also be used to measure people, for instance for medical purposes [5,6].…”