FPGA Based Pattern Generation and Synchonization for High Speed Structured Light 3D Camera

Atif, Muhammad; Lee, Sukhan

doi:10.12928/telkomnika.v15i1.6146

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…The results are presented in terms of FPGA resources acquired by different techniques if implemented independently and in combination with other structured light pattern techniques. Performance of the hardware synchronization was better when compared to software synchronization [ 24 , 68 ]. Qualitative and quantitative analysis of the 3D scanning algorithm is also presented.…”

Section: Resultsmentioning

confidence: 99%

“…After the integration process, the frame is sent to the computer. This procedure keeps going until the last pattern [ 24 ]. In this case, no additional frames are projected and no additional frames are captured.…”

Section: Proposed Frameworkmentioning

confidence: 99%

“…Wang et al [ 23 ] suggested an architecture where a depth frame rate of 120 fps was achieved with an external trigger generated from the projector. A Digital Light Processing (DLP) projector kit was used to synchronize the projected frames to the captured frames [ 24 ] to reconstruct depth information accurately [ 25 ]. Zhang et al [ 26 ] suggested a 30 fps depth frame rate by the synchronized capturing of three phase shifted fringe patterns projected with a DLP projector.…”

Section: Introductionmentioning

confidence: 99%

“…The quality of the point cloud obtained through the hardware synchronization is better when compared to the software synchronization due to the asymmetric exposure time of the camera for each pattern. FPGA has been used as the external hardware to generate the patterns and trigger the camera for structured light systems [ 24 , 32 , 33 , 34 ], but these projector–camera systems are a perfect example of a fixed rate projection system where the camera frame rate and projector screen refresh rate must be the same as the system cannot synchronize if the projector and camera have different screen refresh and frame rate, respectively. A new hardware approach to synchronize the projector–camera system is the use of DLP projector kits, which projects the patterns with high speed and generates the trigger for the camera [ 12 , 17 , 25 , 28 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

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FPGA Based Adaptive Rate and Manifold Pattern Projection for Structured Light 3D Camera System

Atif¹,

Lee²

2018

Sensors

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The quality of the captured point cloud and the scanning speed of a structured light 3D camera system depend upon their capability of handling the object surface of a large reflectance variation in the trade-off of the required number of patterns to be projected. In this paper, we propose and implement a flexible embedded framework that is capable of triggering the camera single or multiple times for capturing single or multiple projections within a single camera exposure setting. This allows the 3D camera system to synchronize the camera and projector even for miss-matched frame rates such that the system is capable of projecting different types of patterns for different scan speed applications. This makes the system capturing a high quality of 3D point cloud even for the surface of a large reflectance variation while achieving a high scan speed. The proposed framework is implemented on the Field Programmable Gate Array (FPGA), where the camera trigger is adaptively generated in such a way that the position and the number of triggers are automatically determined according to camera exposure settings. In other words, the projection frequency is adaptive to different scanning applications without altering the architecture. In addition, the proposed framework is unique as it does not require any external memory for storage because pattern pixels are generated in real-time, which minimizes the complexity and size of the application-specific integrated circuit (ASIC) design and implementation.

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Section: Resultsmentioning

confidence: 99%

Section: Proposed Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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FPGA Based Adaptive Rate and Manifold Pattern Projection for Structured Light 3D Camera System

Atif¹,

Lee²

2018

Sensors

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Projector and Camera Shade Detection Based on Stripe Pattern Sequence for High Quality Structured Light Depth Imaging

Lee

Atif

2021

IEEE Access

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Structured light depth imaging offers a high precision of 3D measurement for applications to industrial modeling, inspection, reproduction and archiving. Despite recent progress, however, structured light depth imaging has yet to settle the trade-off between the number of captured 3D points and that of unwanted outliers, in particular, when a low reflectance surface is mixed with projector and camera shades. This paper presents an approach to solving such trade-off by accurately mapping projector and camera shades under the presence of a low reflectance surface. Unlike conventional approaches relying mostly on pattern intensity for detecting shades, the proposed approach first identifies stripe boundaries legitimate in terms of the projected pattern sequence. Based on the list of legitimate boundaries identified, then, the gaps in pixel and boundary addresses are analyzed to define the respective projector and camera shades, possibly, in the presence of address juxtaposition. Experimental results show that the proposed approach shows superior performance in shade detection as well as outlier removal compared to the state-of-the-art approaches, maximizing the number of captured 3D points while minimizing that of unwanted outliers.

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Adaptive Pattern Resolution for Structured Light 3D Camera System

Atif

Lee

2018

2018 Ieee Sensors

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FPGA Based Pattern Generation and Synchonization for High Speed Structured Light 3D Camera

Cited by 3 publications

References 3 publications

FPGA Based Adaptive Rate and Manifold Pattern Projection for Structured Light 3D Camera System

FPGA Based Adaptive Rate and Manifold Pattern Projection for Structured Light 3D Camera System

Projector and Camera Shade Detection Based on Stripe Pattern Sequence for High Quality Structured Light Depth Imaging

Adaptive Pattern Resolution for Structured Light 3D Camera System

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