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This paper presents the design of an underwater staring spectral imaging system, which has 31 different color filters that covers the spectral range of 400 nm–700nm. The filters are settled on 2 filter wheels so that the size and weight of the system is deduced greatly, which is essential for underwater applications. Experiments are conducted to test the system, and the results show that the system...
In this paper, a Stereo Tracking Dataset is proposed for evaluating binocular tracking algorithms. The dataset contains stereoscopic videos which are collected by our mobile platform in different scenarios and videos that are available publicly. All sequences are carefully synchronized and rectified, and the ground truth of object is annotated by authors. Both raw and processed sequences are provided...
Rail track extraction from the image can be used to determine the position of the rails ahead of a train, which is one of the fundamental tasks for vision-based driver support systems in railways. This paper introduces a method that extracts rails by matching the edge features of the real image to the candidate rail patterns which is parameterically modeled, and the geometric constraints of the rail...
Regularized local linear model has been shown to be an effective approach for reflectance estimation. This approach estimates the reflectance of each test point by the linear combination of only its neighbors. The choice of neighbors is of crucial importance to achieve high estimation accuracy. We propose a principal components analysis based neighborhood selection method to reduce model bias. The...
Surface defects on precision optical elements must be carefully inspected since they impact the normal operation of an optical system. It is a challenge to inspect defects of large-aperture optical elements using an imaging system because of efficiency and accuracy. This paper designs a novel and effective inspection instrument with two imaging systems for large-aperture optical elements. They are...
In this paper we consider the inspection of surface flaws in large aperture optical element. A high efficiency and precision instrument is proposed which contains two kinds of imaging systems. One is dark-field imaging system (DFIS) constructed by line scan camera with 10μm resolution. The other is bright-field imaging system (BFIS) constructed by microscope with 1μm resolution. Considering the small...
Fisheye camera is finding increasing number of applications in robotic vision, visual surveillance, and other fields. But the use of super-wide angle fish-eye lenses causes strong distortions in the resulting images. A method for the correction of fisheye distortion using only single images and linearity of imaged objects is presented. Spherical projection is a simple and effective method to transform...
Recently, it has been a popular issue that using visual perception for autonomous navigation in Unmanned Aerial Vehicle (UAV). However, in the field of computer vision, the restoration of the three-dimensional shape from the two-dimensional image video stream captured by camera is the central issue, which includes the feature point selection, tracking studies, and structural problems of uncalibrated...
A simple binocular visual equipment is designed in this paper, which is mainly composed by two CCD cameras and four stepping motors. Firstly, the two cameras' initial location is determined based on rough location by moving to the limiting position, and precise location by driving the image center aligning with fitted ellipse center. Then, the transformation matrix between coordinate systems of motion...
In this paper, we introduce an improved version of DAISY descriptor algorithm, which is used for high-quality image keypoint matching. Since DAISY descriptor algorithm has many prominent advantages but lacks the ability of handling large in-plane rotation, we thus construct our Rotation-Invariant DAISY descriptor to effectively settle this shortcoming. The matching results of our scheme can be also...
In this article, we describe a system that estimates the position and orientation of a calibrated camera. For better estimation accuracy, artificial markers made up of infrared LEDs are placed in certain pattern onto the ceiling of a room. A 3D reconstruction process is first performed offline so that the coordinates of all LEDs within a unified world frame are determined. This process, based on incremental...
CCD image usually has a huge amount of data with high-resolution, therefore it is difficult to capture and browse the image real-timely in real project. In the traditional capture and transportation systems, we usually first capture and store the image into storage medium, then read out the CCD data for browse later, but this method is not good for diagnosis and debugging real-timely. For eliminating...
3D reconstruction has a long history, few workable reconstruction systems are available although many magnificent theories and algorithms are reported in literature. In this paper, a 3D reconstruction system for indoor scenes with a rotating platform is reported, including its key components such as system calibration, feature matching and 3D reconstruction. Experimental results show that this system...
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