Microscopic vision based on the adaptive positioning of the camera coordinate frame

Zhang, Guangjun; Li, Weixian; Wei, Zhenzhong; Cao, Zhipeng; Wang, Yali

doi:10.1002/jemt.22062

Cited by 10 publications

(3 citation statements)

References 22 publications

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“…Image processing methods such as image preprocessing, feature extraction, edge recognition and detection are usually used [15][16][17] . But in real world, these methods are not better suited for the changing of the target's structure and component.…”

Section: Spatial Angle On-line Measurement Methodsmentioning

confidence: 99%

A new spatial angle assembly method of the ICF target

et al. 2017

High Pow Laser Sci Eng

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The designs of inertial confinement fusion (ICF) targets, which field on ShenGuang III, are becoming more complex and more stringent in terms of assembly precision. A key specification of these targets is the spatial angle alignment accuracy. To meet these needs, we present a new spatial angle assembly method, using target part's 3D model-based dual orthogonal camera vision, which is better suited for the flexible automation of target assembly processes. The two-hands structure micromanipulate system and dual orthogonal structure visual feedback system were investigated by considering the kinematics, spatial angle measuring, and motion control in an integrated way. In this paper, we discuss the measurement accuracy of spatial angle assembly method, which compared the real-time image acquisition with the redrawing 2D projection. The result shows that the assembly method proposed is very effective and meets the requirements of angle assembly accuracy, which is less than 1 • . Also, this work is expected to contribute greatly to the advancement of other target microassembly equipments.

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Section: Spatial Angle On-line Measurement Methodsmentioning

confidence: 99%

A new spatial angle assembly method of the ICF target

et al. 2017

High Pow Laser Sci Eng

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“…Pei et al (2012) studied the micro stereo imaging principle of SLMs and proposed a method of micro stereo occlusion correction to address micro fluidic chip detection. A vision calculation method was proposed by Zhang et al (2012) and Li et al (2014) and used to characterize gears. Robert et al (1997) calculated the topography of small objects using a fringe projection technique and presented a microscopy measuring system containing a Leica MZ-12 SLM(Leica Microsystems Inc., Wetzlar, Germany).…”

Section: Introductionmentioning

confidence: 99%

Disparity Surface Reconstruction Based on a Stereo Light Microscope and Laser Fringes

Wang

2018

Microsc Microanal

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Microscopic vision systems based on a stereo light microscope (SLM) are used in microscopic measuring fields. Conventional measuring methods output the disparity surface based on stereo matching methods; however, these methods require that stereo images contain sufficient distinguishing features. Moreover, matching results typically contain many mismatched points. This paper presents a novel method for disparity surface reconstruction by combining an SLM and laser measuring techniques. The surfaces of small objects are scanned by a laser fringe, and a stereo image sequence containing laser stripes is obtained. The central contours of the laser stripes are extracted, and central contours are derived for alignment. A disparity coordinate system is then defined and used to analyze the relationship between the motion direction and reference plane. Next, the method of aligning disparity contours is proposed. The results show that our method can achieve a precision of ±0.5 pixels and that the real and measured shapes described by the disparity surface are consistent based on our method. Our method is confirmed to perform much better than the conventional block-matching method. The disparity surface output obtained by our method can be used to measure the surface profiles of microscopic objects accurately.

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“…An alarm signal would be given when the disparity value decreased to a certain extent. Zhang, Li, Wei, Cao, and Wang () and Li, Wei, and Zhang () used SLM stereovision to measure surface properties of small objects and proposed a calibration method of SLM stereovision. To achieve a high precision, more numerous distortion parameters must be considered in SLM stereovision model which will create a very complicated and highly nonlinear vision model.…”

Section: Introductionmentioning

confidence: 99%

A stereovision model applied in bio‐micromanipulation system based on stereo light microscope

Wang

2017

Microscopy Res & Technique

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A bio-micromanipulation system is designed for manipulating micro-objects with a length scale of tens or hundreds of microns based on stereo light microscope. The world coordinate reconstruction of points on the surface of micro-objects is an important goal for the micromanipulation. Traditional pinhole camera model is applied widely in macrocomputer vision. However, this model will output bad data with remarkable error if it is directly used to reconstruct three-dimensional world coordinates for stereo light microscope. Therefore, a novel and improved pinhole camera model applied in bio-micromanipulation system is proposed in this article. The new model is composed of binocular-pinhole model and error-correction model. The binocular-pinhole model is used to output the basic world coordinates. The error-correction model is used to correct the errors from the basic world coordinates and outputs the final high-precision world coordinates. The results show that the new model achieves a precision of 0.01 mm in the X direction, 0.01 mm in the Y direction, and 0.015 mm in the Z direction within a maximum reconstruction distance of 4.1 mm in the X direction, 2.9 mm in the Y direction, and 2.25 mm in the Z direction, and that traditional pinhole camera model achieves a lower and unsatisfactory precision of about 0.1 mm.

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Microscopic vision based on the adaptive positioning of the camera coordinate frame

Cited by 10 publications

References 22 publications

A new spatial angle assembly method of the ICF target

A new spatial angle assembly method of the ICF target

Disparity Surface Reconstruction Based on a Stereo Light Microscope and Laser Fringes

A stereovision model applied in bio‐micromanipulation system based on stereo light microscope

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