Depth sensors for three-dimensional object acquisition are widely used and available in many different sizes weight classes. The measuring method the accuracy depend on task to be performed. integration of depth mobile devices such as tablets smartphones is largely new. TrueDepth system iPhone X shows which measurement accuracies can achieved with these systems areas application addition consumer fun. investigations show that tasks millimeter range.

The combination of the multispectral imaging and 3D in one system would render possible varieties applications different fields. In this work a method is proposed for registration data point cloud, which number spectral bands increased by combining images through information. Based on method, consisting two filter wheel cameras digital projector developed. This can provide maximally 23 with short acquisition duration ca. 1.5 seconds achieve fusion accuracy 15 μm measurement field 128 mm ×...

LiDAR technology is increasingly being used as an area-based 3D measurement method. In addition to high aspirations in terms of accuracy, speed and resolution, manufacturers lidar cameras are competing reduce size, weight power consumption. As one the most compact high-resolution systems, Intel RealSense L515 has undergone extensive testing according VDI/VDE Guideline 2634. addition, tests were conducted with glossy or partially transparent surfaces (acrylic glass, carbon fiber material...

A sensor based on fringe projection technique was developed which allows ultrafast measurements of the surface flat measuring objects realizes a data acquisition rate up to 8.9 million 3D points per second. The high velocity achieved by consequent code reduction and parallel processing. Fringe sequence length reduced using geometric constraints arrangement including epipolar geometry. Further image obtained omission Gray objects. may be used e.g. for inspection conductor boards.

Measuring the three-dimensional (3D) surface shape of objects in real time has become an important task e.g. industrial quality management or medical sciences. Stereo vision-based arrangements connection with pattern projection offer high data acquisition speed and low computation time. However, these coded-light techniques are limited by which is conventionally range 200. . .250Hz. In this contribution, we present concepts a realized setup so-called 3D array projector. It ultra-slim, but...

An optical three-dimensional (3-D) sensor based on a fringe projection technique that realizes the acquisition of surface geometry small objects was developed for highly resolved and ultrafast measurements. It data rate up to 60 high-resolution 3-D datasets per second. The high measurement velocity achieved by consequent code reduction parallel processing. length image sequence obtained omission Gray using geometric restrictions constraints arrangement. covers three different fields between...

View planning for three-dimensional (3D) reconstruction and inspection solves the problem of finding an efficient sequence views allowing complete high quality complex objects. To fulfil this task, view methods need to deal with sensor limitations satisfy predefined goals. Our objective is jointly evaluate accuracy requirements coverage during planning, optimise procedure, as well explicitly take configuration space constraints into account. We present a novel model-based approach, which at...

Welding processes are influenced by many parameters. By merging data to multimodal information from multichannel images and signals of various welding parameters, the correlation these their influence on weld seam imperfections investigated. The application a multispectral area camera array enables new approach non-destructive testing particularly supported passive thermography. results show different cooling behaviour several imperfections, such as porosity, present relation between...

Fringe projection is an established method for contactless measurement of 3D object structure. Adversely, the coding fringe ambiguous. To determine points with absolute position in space, this has to be unique. We propose a novel approach phase unwrapping without using additional pattern projection. Based on stereo camera setup, image segmentation each view areas height jumps larger than period necessary. Within these segments, potentially error. Alignment maps between two views realized by...

A mobile hand held battery powered sensor based on fringe projection technique for preservation of fossil traces and archaeological excavations was developed. It consists a projector two cameras covers measuring field about 240 mm x 175 160 mm. The core time data acquisition is 0.34 s the final result 3D point cloud obtained in less than five seconds. Errors due to movements are detected can be swept out. allows capturing observed surface together with colour information. successfully...

The requirement for a non-transparent Lambertian like surface in optical 3D measurements with fringe pattern projection cannot be satisfied at translucent objects. translucency causes artifacts and systematic errors the decoding, which could lead to measurement decrease of stability. In this work, influence light wavelength on was investigated stereoscopic system consisting two filter wheel cameras narrowband bandpass filters projector wide-band source. experimental results show significant...

Abstract. In this work a simple new method for calibration evaluation and stability monitoring of fringe projection based 3D scanners is introduced. This on high precision point correspondence finding sensors using phase values in two perpendicular directions epipolar geometry concerning data stereo sensors. The can be applied the measurement process does not require any additional effort or equipment. It allows current set parameters consideration over certain temporal progression....

The fields of optical 3D measurement system applications are continuously expanding and becoming more diverse. To evaluate appropriate systems for various tasks, comparable parameters necessary, whereas the modulation transfer function (3D-MTF) has been established as a further criterion. Its aim is determination response between straight, sharp-edged cube its opposite ideal calculated one. Within scope this work simulations practical investigations regarding 3D-MTF's influences main issues...

We present an approach for single-frame three-dimensional (3-D) imaging using multiwavelength array projection and a stereo vision setup of two multispectral snapshot cameras. Thus sequence aperiodic fringe patterns at different wavelengths can be projected detected simultaneously. For the 3-D reconstruction, computational procedure pattern extraction from images, denoising image data, matching is developed. In addition, proof-of-concept provided with experimental measurement results,...

Abstract In the production of modern electric drives for battery vehicles, hairpin technology is used to increase copper fill factor in stator a permanently excited synchronous machine. A central process these stators contacting ends by means laser beam welding. This welding characterized geometric and process-related deviations from previous steps, which influence result welded joint. It desirable find an in-process method monitoring. As part monitoring joints, high-speed camera images are...

Due to the electrification of drive train, hairpin technology for stators has established itself in automotive industry. Hairpins are rectangular copper wires connected full stator coils using laser beam welding. The welding results depend on preliminary processes and tolerances system. quality connection is defined by its cross-sectional area that influenced porosity. Another characteristic spatters. quantification porosity seams usually carried out post-process X-Ray computed tomography...

Fringe projection is an established method to measure the 3D structure of macroscopic objects. To achieve both a high accuracy and robustness certain number images with pairwise different pattern required. Over this sequence it necessary that each object point corresponds same image at every time. This situation no longer given for measurements under motion. One possibility solve problem restore static situation. Therefore, acquired camera have be realigned secondly, degree fringe shift has...

Shading effects induced by illumination and local object surface orientation could strongly deteriorate the accuracy of colour imaging. Therefore, a shading correction is needed for high fidelity. In this work 3D model based inverse rendering approach proposed narrowband multispectral imaging system with calibrated extern broadband light source. The colourimetric evaluation an X-Rite checker shows that method ensure mean difference value CIEDE2000 ΔE < 3 viewing angle range -30° to 30°,...

Within the paper use of a 3D-line scanner is evaluated to realize an inline and intime detection weld imperfections for automated MAG-welding fillet welds. The required conditions are in accordance with quality level B international standard ISO 5817 [1]. used system Wenglor wavelength 660 nm image recording frequency at least 200 Hz. This able detect, as stand-alone system, geometry surface weld. Therefore, algorithms were developed reliable recognition deviations regarding size,...

Inline three-dimensional measurements are a growing part of optical inspection. Considering increasing production capacities and economic aspects, dynamic under motion inescapable. Using sequence different pattern, like it is generally done in fringe projection systems, relative movements the measurement object with respect to 3d sensor between images one pattern have be compensated. <br/> Based on application fully automated inspection circuit boards at an assembly line, knowledge speed...

Welding processes are influenced by many parameters.By applying multimodal data fusion of multichannel image and signals various welding parameter, the correlation these their influence on weld seam imperfections investigated.The application a multispectral area camera array enables new approach non-destructive testing particularly supported passive thermography.The results show different cooling behaviour several imperfections, such as porosity, present relation between incorrect parameters...

This paper presents an approach for single-shot 3D shape reconstruction using a multi-wavelength array projector and stereo-vision setup of two multispectral snapshot cameras. Thus, sequence six to eight aperiodic fringe patterns can be simultaneously projected at different wavelengths by the developed captured For calculation point clouds, computational procedure pattern extraction from single images, denoising image data, stereo matching is developed. In addition, proof-of-concept provided...

Usually, a large number of patterns are needed in the computational ghost imaging (CGI). In this work, possibilities to reduce pattern by integrating compressive sensing (CS) algorithms into CGI process systematically investigated. Based on different combinations sampling and image priors for L1-norm regularization, CS-based approaches proposed implemented with iterative shrinkage thresholding algorithm. These CS-CGI evaluated various test scenes. According quality reconstructed images...

In order to enhance the efficiency of quality inspection Direct Copper Bonded (DCB) structures an optical using a 3D measuring system is conceivable. However, it challenging task use measurement techniques for diffuse reflective copper surfaces. This work deals with detection defects surface, multi- and hyperspectral acquisition devices. Over broad spectral range from visual spectrum short-wave infrared (400 nm - 1700 nm) analysed which wavelengths provide good contrast ratios flaws. For...