This paper proposes a fisheye camera calibration method based on multiple chessboard detection. To address the complexity and multiple-frame requirement of traditional methods, this detects corner points using libcbdetect algorithm obtains pixel coordinates. Then, it uses depth-first search to obtain world coordinates corners calculates homography matrix world-pixel pair through RANSAC algorith...

Multi-cameras system is widely applied in 3D computer vision especially when multiple 11 cameras are distributed on both sides of the measured object. The calibration methods of multi12 cameras system are critical to the accuracy of vision measurement and the key is to find an 13 appropriate calibration target. In this paper, a high-precision camera calibration method for multi14 cameras system...

In recent works, Knuth and Bahreyni have demonstrated that the concepts of space and time are emergent in a coarse-grained model of direct particle-particle influence. In addition, Knuth demonstrated that observer-made inferences regarding the free particle, which is defined as a particle that influences others, but is not itself influenced, result in a situation identical to the Feynman checke...

A general method is proposed for predicting the asymptotic percolation threshold of networks with bottlenecks, in the limit that the subnet mesh size goes to zero. The validity of this method is tested for bond percolation on filled checkerboard and "stack-of-triangle" lattices. Thresholds for the checkerboard lattices of different mesh sizes are estimated using the gradient percolation method,...

for a standard checkerboard of conductivity λg and λw. The explicit solution of the corresponding temperature-field was later found by Berdichevskii [1]. In particular he found that the heat-flux is infinitely high in the corners of the squares. Subsequently, explicit solutions for rectangular and triangular checkerboards were found in [17, 19, 20]. Mortola and Steffé [18] presented in 1985 an ...

Portable digital devices such as PDAs and camera phones are the easiest most widely used methods to preserve collect information. Capturing a document image using this method always has warping issues, especially when capturing pages from book rolled-up documents. In article, we propose an effective correct of captured image. The proposed uses checkerboard calibration pattern calculate world po...

nowadays immunochemical techniques have played a very important and valuable role in quantitative and qualitative assays of liquid compounds of the body. producing antibody against immunogenes is the first step to make immunochemical kits. in this study production and purification of polyclonal antibody against melatonin has been considered. this hormone which has several important functions in...

The aim of this study was to investigate the in vitro activities of polymyxin B (PB) and rifampin (RIF) in combination with ampicillin/sulbactam (AS) or cefoperazone/sulbactam (CS) against 20 multidrug-resistant Acinetobacter baumannii (MDR-AB) isolates by the checkerboard and E-test methods. Fractional inhibitory concentration index (FICI) values were defined as synergy, FICI ≤ 0.5; additivity...

Multi-camera systems are widely applied in the three dimensional (3D) computer vision, especially when multiple cameras are distributed on both sides of the measured object. The calibration methods of multi-camera systems are critical to the accuracy of vision measurement and the key is to find an appropriate calibration target. In this paper, a high-precision camera calibration method for mult...