A camera calibration technique based on OpenCV

Wang, Y. M.; Li, Y.; Zheng, Jinhai

doi:10.1109/icicis.2010.5534797

Cited by 84 publications

(39 citation statements)

References 5 publications

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“…Desenvolvido na linguagem de programação Python 5 [18], o módulo de calibração proposto utiliza os recursos da biblioteca de software OpenCV (do inglês, Open Source Computer Vision Library) [19], cujas funções de calibração de câmera fundamentam-se no modelo de câmera estenopeica (pinhole), considerando nesse modelo as distorções radiais e tangenciais de lentes [20].…”

Section: Calibrar a Câmera De Origemunclassified

A Estatura como Traço Biométrico Auxiliar na Identificação de Autores de Delito – Aplicação de Metodologia Forense de Estimativa de Altura Humana em Vídeos de Sistema de Vigilância

Júnior¹,

Pedrini

2020

Rev. Bras. Crimin.

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ResumoA necessidade de estabelecimento da identificação de indivíduos fomentou o uso da biometria em diferentes aplicações, dentre elas, as forenses. As aplicações forenses de biometria envolvem problemas de determinação de fonte ou de origem, em que o perito criminal oficial é inquirido a responder, por meio do cotejo entre materiais padrão (obtido do suspeito) e questionados (vestígios), se o suspeito é ou não a fonte do vestígio. Em geral, exames de determinação de fonte caracterizam-se por analisar um determinado traço biométrico tradicional -como morfologia da face e características vocais (ou da voz). Esses traços biométricos, além de possuírem graus de distinção diferentes, podem ser insuficientes ou estar indisponíveis em um material questionado, de forma a limitar ou até mesmo inviabilizar a análise pericial. O uso de informações auxiliares -como a altura -podem complementar as informações de um indivíduo, elevando a precisão no estabelecimento de sua identificação. Entretanto, estas características auxiliares -denominadas de biometria branda -são úteis quando utilizadas ponderada e complementarmente aos identificadores biométricos tradicionais. Este artigo apresenta uma metodologia de estimativa de altura em vídeos que não necessita de cenas geometricamente estruturadas. Para demostrar a efetividade da solução, um estudo de caso foi apresentado com o propósito de verificar se o autor do homicídio e o suspeito eram ou não a mesma pessoa. A qualidade do material questionado permitiu extrair duas características convergentes entre eles: compleição e formato/dimensão do dorso nasal. Para complementar as convergências, estimou-se a estatura do autor, fato que elevou o grau de plausibilidade de ambos serem a mesma pessoa. AbstractThe need to establish the identification of individuals encouraged the use of biometrics in different applications, such as forensics. Forensic biometric applications involve source or origin determination problems, where an official criminal expert is inquired to answer whether a suspect is or not the source of the trace by comparing standard materials (obtained from the suspect) and questioned materials (traces). In general, source determination tests are characterized by analyzing a particular biometric trait, such as facial morphology and speech characteristics. These biometric traits, besides having different degrees of distinction, may be insufficient or unavailable in a questioned material, in order to limit or even make the expert analysis unfeasible. The use of auxiliary information, such as height, can complement an individual's information, increasing accuracy in establishing his/her identification. However, these auxiliary features, known as soft biometrics, are useful when used in a weighted and complementary manner to traditional biometric identifiers. This paper presents a methodology for estimating height in videos that does not require geometrically structured scenes. To demonstrate the effectiveness of the solution, a case study is presented whose purpose was to ver...

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Section: Calibrar a Câmera De Origemunclassified

A Estatura como Traço Biométrico Auxiliar na Identificação de Autores de Delito – Aplicação de Metodologia Forense de Estimativa de Altura Humana em Vídeos de Sistema de Vigilância

Júnior¹,

Pedrini

2020

Rev. Bras. Crimin.

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“…To start the camera calibration, a camera model has to be chosen and be described. The OpenCV calibration algorithm utilizes a pinhole camera model and introduces radial and tangential distortion [3]. Distortion correction is vital since the presented multi-camera system uses low-cost board-level cameras with S-mount lenses, which introduce an amount of distortion to the images that can not be neglected.…”

Section: Single Camera Calibrationmentioning

confidence: 99%

Modelling and calibration of multi-camera-systems for 3D industrial supervision applications

Straube

Zhang

Yaroshchuk

et al. 2019

Photonics and Education in Measurement Science 2019

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With the advent of industry 4.0, the introduction of smart manufacturing and integrated production systems, the interest in 3D image-based supervision methods is growing. The aim of this work is to develop a scalable multi-camera-system suitable for the acquisition of a dense point cloud representing the interior volume of a production machine for general supervision tasks as well as for navigation purposes without a priori information regarding the composition of processing stations. Therefore, multiple low-cost industrial cameras are mounted on the machine housing observing the interior volume. In order to obtain a dense point cloud, this paper reviews aspects of metric stereo calibration and 3D reconstruction with attention being focused on target-based calibration methods and block matching algorithms.

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“…( | ) is the matrix with extrinsic parameters. This equation expresses the relationship between a point in the image and a point in the space plane [16].…”

Section: B Camera Calibrationmentioning

confidence: 99%

Real-Time Implementation of Image Based PLC Control for a Robotic Platform

Ayten¹

2019

Balkan Journal of Electrical and Computer Engineering

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In this study, image based real-time control of a linear robotic platform was performed. This robotic platform is used to determine the location of the mushroom and to direct the linear platform to the detected position in real time with PLC control. Haar-Cascade classifier was used to detect mushroom position and Visual Studio C # .NET platform was used to test the Cascade classifier and write other evaluation codes. One of the most important outputs of this work is to determine the actual position in the global coordinate from the pixel-based location of the object in the image using an ordinary USB camera or built-in camera. Calibration technique was used for this determination.. His work has focused on the development and application of control theory to a variety of mechatronic systems, with a focus on observation and estimation-based control. Much of his recent work has focused on the analysis and control of dynamical systems that arise in engineering applications.

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A camera calibration technique based on OpenCV

Cited by 84 publications

References 5 publications

A Estatura como Traço Biométrico Auxiliar na Identificação de Autores de Delito – Aplicação de Metodologia Forense de Estimativa de Altura Humana em Vídeos de Sistema de Vigilância

A Estatura como Traço Biométrico Auxiliar na Identificação de Autores de Delito – Aplicação de Metodologia Forense de Estimativa de Altura Humana em Vídeos de Sistema de Vigilância

Modelling and calibration of multi-camera-systems for 3D industrial supervision applications

Real-Time Implementation of Image Based PLC Control for a Robotic Platform

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