Shengpeng Fu

• Chinese Academy of Sciences

To improve the performance and reduce the weight of new-generation transparent windshields in aircraft, composite structures are commonly used. The thickness of each layer in a composite windshield has a significant impact on its optical properties and load-bearing capacity. However, existing thickness measurement methods for transparent windshield...

Bend tubes have been widely used in aerospace equipment due to their excellent mechanical properties and chemical properties. However, elliptic deformation will occur in the process of bending, which will reduce the pressure bearing capacity and service life of the bend tube. In order to ensure the production quality of the bend tube, a method of d...

3D scanning is a crucial step to ensure the machining quality of the workpiece and is an essential part of intelligent manufacturing. However, existing scanning systems usually have only one profiler, which must be combined with a dynamic tracking system to achieve a complete scan of a workpiece. This scanning method has low efficiency and complica...

Aiming at the problem of fuzzy edge segmentation and incomplete division in DeepLabV3+ segmentation results of parts, we propose an improved DeepLabV3+ semantic segmentation algorithm. Firstly, We replace Xception in the original network with lightweight MobileNet_V2 on the backbone network, improving the lightness of the network model. Then, chann...

Multi-camera systems have important applications in industrial online measurement, attracting wide interest due to their encouraging performance. However, how to develop a convenient and high-accuracy multi-camera calibration model is a big challenge. Traditional calibration methods based on 2D object require the preparation of high-precision and l...

For high-value aircraft, in order to ensure their stealth, pneumatic and safety characteristics, surface geometric defects such as unacceptable rivet height and seam width must be accurately detected during the manufacturing process. These defects need to be controlled within a very small scope of error. Traditional defect detection methods are dif...

Circular holes on industrial parts are a very important feature, and are often used as assembly references for other parts, so accurate measurement is required. Circular hole measurement based on computer vision is a promising method and very challenging task because it is tricky to find the edge of a hole accurately in an image due to the diversit...

Using 5-axis CNC machine tools for high speed machining, once a mutation occurs somewhere in the processing interference and mutations of surface corner, the mutation of tool axis vector may occur rapidly, while the use of traditional methods including retracting and then engaging again, will inevitably lead to reduce the product quality and proces...

A new extrinsic calibration method of a display-camera system that the display is not in the direct view of the camera is proposed. An annular mirror is used so that the camera can capture the virtual image of the display. The position of the mirror can be obtained after outer circle is detected. The position parameters are determined uniquely by p...

Our work focuses on the extrinsic calibration of a display-camera system where the camera has no direct view of the display. An annular planar mirror is used to reflect the display so that the camera can capture the reflection images. The position of the mirror can be obtained after outer circle is detected. The position parameters are determined u...

Aiming at the extrinsic camera calibration with respect to a reference object without a direct view, an annular mirror based automatic calibration method is proposed. The camera captures the images of the reference object through the reflection of a known-radius annular mirror. The equations of the inner and outer circles of the mirror in the image...

To solve the problems in computer vision based measurement for smooth and continuous specular surface, an imaging simulation measurement method is proposed. The geometrical optics principle for specular surface is studied. A setup which consists of a camera and a LCD display is used to measure the specular objects. A parametric surface is used to s...

Aiming at the calibration problem of the position parameter of camera and screen in vision-based specular surface measurement, we propose a fast and simple calibration method based on mirror. A LCD screen is used to project a new circle-based pattern, then a camera captures the image of the pattern in the mirror, and the camera calibration is perfo...

In this paper, a robust recognition algorithm for encoded targets in close-range photogrammetry is proposed. Firstly, Canny detector is used to detect edges from an input image. Secondly, the least squares method is employed to fit ellipses to the set of data points yielded by the edge detector. Three restriction criteria based on length, shape, an...