Registered depth and intensity data at a high frame rate, a compact design, low weight and a reduced power consumption have motivated the increasing usage of lock-in time-of-flight cameras in research areas such as co...
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ISBN:
(纸本)9781467346214
Registered depth and intensity data at a high frame rate, a compact design, low weight and a reduced power consumption have motivated the increasing usage of lock-in time-of-flight cameras in research areas such as computer graphics, machine vision and robotics. State of the art is to use continuous wave modulation with square waves for TOF cameras. Square waves can be easily generated digitally with a high accuracy and stability using programmable logic devices. In this paper a modulation method based on sine waves is proposed, which significantly reduces the depth distortion offset (wiggling effect) of lock-in TOF cameras.
Registered depth and intensity data at a high frame rate, a compact design, low weight and a reduced power consumption have motivated the increasing usage of lock-in time-of-flight cameras in research areas such as co...
详细信息
ISBN:
(纸本)9781467346214
Registered depth and intensity data at a high frame rate, a compact design, low weight and a reduced power consumption have motivated the increasing usage of lock-in time-of-flight cameras in research areas such as computer graphics, machine vision and robotics. State of the art is to use continuous wave modulation with square waves for TOF cameras. Square waves can be easily generated digitally with a high accuracy and stability using programmable logic devices. In this paper a modulation method based on sine waves is proposed, which significantly reduces the depth distortion offset (wiggling effect) of lock-in TOF cameras.
In machine vision applications, Time-of-Flight (TOF) sensors like the Photonic Mixer Devices (PMD) became considerable alternatives to common 3D sensing devices. Because of the enormous progress in TOF-vision systems,...
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ISBN:
(纸本)9781457717710
In machine vision applications, Time-of-Flight (TOF) sensors like the Photonic Mixer Devices (PMD) became considerable alternatives to common 3D sensing devices. Because of the enormous progress in TOF-vision systems, nowadays 3D matrix cameras can be used for many applications such as robotic, automotive, industrial, medical and multimedia applications. This paper focuses on the range data resolution for machine vision applications in the close-up range. A new approach is presented which achieves a range data resolution in the lower millimeter range for low-cost commercial TOF cameras. Experimental results show that the proposed approach is well suited for machine vision applications.
During the last years, Time-of-Flight sensors achieved a significant impact onto research fields in machine vision. In comparison to other common 3D sensing devices they combine the advantages of active sensors provid...
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ISBN:
(纸本)9781457717710
During the last years, Time-of-Flight sensors achieved a significant impact onto research fields in machine vision. In comparison to other common 3D sensing devices they combine the advantages of active sensors providing accurate distance measurements and camera-based systems recording a 2D matrix at a high frame rate. This paper focuses on the currently implemented 4-phase-shift algorithm to calculate the range image in this type of sensors. A new approach is presented which increases the range calculation time by a factor of four. Experimental results show that the proposed algorithm is well suited for real-time processing of the range images of TOF cameras.
Object movement influences the distance reliability of 3-D time-of-flight cameras and thus affects subsequent processing tasks in a negative way. This paper proposed a simple motion suppression method for objects movi...
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Object movement influences the distance reliability of 3-D time-of-flight cameras and thus affects subsequent processing tasks in a negative way. This paper proposed a simple motion suppression method for objects moving on a conveyor belt, which can be easily implemented in hardware. Due to the hardware implementation, real-time performance is guaranteed. The algorithm has been validated in software first and subsequently implemented into a field-programmable gate array. Experimental results show that the proposed algorithm is effectively working.
During the last years, Time-of-Flight sensors achieved a significant impact onto research fields in machine vision. In comparison to stereo vision system and laser range scanners they combine the advantages of active ...
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ISBN:
(纸本)9780819486813
During the last years, Time-of-Flight sensors achieved a significant impact onto research fields in machine vision. In comparison to stereo vision system and laser range scanners they combine the advantages of active sensors providing accurate distance measurements and camera-based systems recording a 2D matrix at a high frame rate. Moreover low cost 3D imaging has the potential to open a wide field of additional applications and solutions in markets like consumer electronics, multimedia, digital photography, robotics and medical technologies. This paper focuses on the currently implemented 4-phase-shift algorithm in this type of sensors. The most time critical operation of the phase-shift algorithm is the arctangent function. In this paper a novel hardware implementation of the arctangent function using a reconfigurable processor system is presented and benchmarked against the state-of-the-art CORDIC arctangent algorithm. Experimental results show that the proposed algorithm is well suited for real-time processing of the range images of TOF cameras.
Object movement influences the distance reliability of 3-D time-of-flight cameras and thus affects subsequent processing tasks in a negative way. This paper proposed a simple motion suppression method for objects movi...
详细信息
Object movement influences the distance reliability of 3-D time-of-flight cameras and thus affects subsequent processing tasks in a negative way. This paper proposed a simple motion suppression method for objects moving on a conveyor belt, which can be easily implemented in hardware. Due to the hardware implementation, real-time performance is guaranteed. The algorithm has been validated in software first and subsequently implemented into a field-programmable gate array. Experimental results show that the proposed algorithm is effectively working.
Object movement influences distance reliability of 3D TOF cameras and thus affects subsequent processing task in a negative way. This paper proposed a simple motion suppression method for objects moving on a conveyor ...
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ISBN:
(纸本)9781424428335
Object movement influences distance reliability of 3D TOF cameras and thus affects subsequent processing task in a negative way. This paper proposed a simple motion suppression method for objects moving on a conveyor belt, which can be easily implemented into a FPGA. Due to the hardware implementation real-time performance is guaranteed. Experimental results show that the proposed algorithm is working effectively.
Stereo vision (SV) is widely used and is well known for many 3-D image applications. In this paper, a 3-D time-of-flight system will be introduced, which is integrated into a robot vision system. The pros and cons of ...
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Stereo vision (SV) is widely used and is well known for many 3-D image applications. In this paper, a 3-D time-of-flight system will be introduced, which is integrated into a robot vision system. The pros and cons of the system in comparison with SV are discussed, and the basic equations needed to acquire the range information are illustrated. Moreover, object segmentation algorithms working on the range data are presented. Experimental results show that the accuracy and repeatability of such a system is applicable for industrial applications.
Spurious reflection is one of the troublesome problems in phase-shifting interferometry. This paper deals with the problem on the basis of a two-run-times-two-frame phase-shift algorithm, in which the phaseshifts are...
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Spurious reflection is one of the troublesome problems in phase-shifting interferometry. This paper deals with the problem on the basis of a two-run-times-two-frame phase-shift algorithm, in which the phaseshifts are shared out between the reference beam and the object beam. The effect of spurious reflection on phase measurement is investigated;two simple methods for removal of the effect are presented and each needs only six interferograms. Two other solutions to the spurious reflection problem are also reviewed. The simulation results obtained using these four solutions are compared. The influence of a mix of phase-shifter miscalibration and spurious reflection on phase measurement is also discussed.
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