Pixel-wise real-time advanced calibration method for thermal infrared cameras

2010 ◽  
Author(s):  
Pierre Tremblay ◽  
Louis Belhumeur ◽  
Martin Chamberland ◽  
André Villemaire ◽  
Patrick Dubois ◽  
...  
Keyword(s):  
Real Time ◽  
Thermal Infrared ◽  
Calibration Method ◽  
Infrared Cameras

Real-Time Detection of Pedestrians

2016 ◽  
pp. 225-243
Author(s):  
Juan Serrano-Cuerda ◽  
José Carlos Castillo ◽  
María T. López ◽  
Antonio Fernández-Caballero
Keyword(s):  
Infrared Spectrum ◽  
Real Time ◽  
Video Surveillance ◽  
Pedestrian Detection ◽  
Visible Spectrum ◽  
Thermal Infrared ◽  
Lower Sensitivity ◽  
Key Technology ◽  
Infrared Cameras ◽  
Technological Limitations

Real-time pedestrian detection is a key technology for video surveillance. A widespread approach for detecting pedestrians is the use of color information. In recent times, the use of thermal infrared cameras has revealed to be an excellent alternative that offers good results in people segmentation. Nonetheless, thermal infrared cameras are very sensitive to the overall heat detected at each image. Moreover, a great amount of infrared images has low spatial resolution and lower sensitivity than visible spectrum images due to the technological limitations of infrared cameras. This chapter introduces a comparison of three different algorithms for real-time and robust pedestrian detection in the infrared spectrum. The aim of the paper is to look for the best algorithms prepared to resolve the conflicts that arise in the detection process in image sequences. We propose to use simple rules as conflict resolution mechanism when the outputs of the three algorithms do not coincide.

scholarly journals Assessment of Cracking Widths in a Concrete Wall Based on TIR Radiances of Cracking

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4980
Author(s):  
Tung-Ching Su
Keyword(s):  
Crack Detection ◽  
Thermal Infrared ◽  
Subtropical Climate ◽  
Architectural Style ◽  
Concrete Wall ◽  
Concrete Crack ◽  
Operation Procedure ◽  
Historic House ◽  
Multiple Measurements ◽  
Infrared Cameras

The techniques of concrete crack detection, as well as assessments based on thermography coupled with ultrasound, have been presented in many works; however, they have generally needed an additional source of thermal infrared (TIR) radiance and have only been applied in laboratories. Considering the accessibility of thermal infrared cameras, a TIR camera (NEC F30W) was employed to detect cracking in the concrete wall of an historic house with a western architectural style in Kinmen, Taiwan, based on the TIR radiances of cracking. An operation procedure involving a series of image processing and statistical analysis processes was designed to evaluate the performance of the TIR camera in the assessment of the cracking width. This procedure using multiple measurements was implemented from March to August 2019, and the t-tests indicated that the temperature differences between the inside and outline of the concrete cracks remained insignificant as the temperature or relative humidity (RH) in the subtropical climate rose. The experimental results of the operation procedure indicated that the maximum focusing range, which is related to the size of the sensor array, and the minimum detectable crack width of a TIR camera should be 1.0 m and 6.0 mm, respectively, in order to derive a linear regression model with a determination coefficient R2 of 0.733 to estimate the cracking widths, based on the temperature gradients. The validation results showed that there was an approximate R2 value of 0.8 and a total root mean square error of ±2.5 mm between the cracking width estimations and the observations.

Augmented Reality Overlay System for Computer-guided Needle Procedures

1969 ◽  
Author(s):  
Zachary Baum
Keyword(s):  
Augmented Reality ◽  
Real Time ◽  
Region Of Interest ◽  
Calibration Method ◽  
Position Error ◽  
Ct Image ◽  
Entire System ◽  
Projected Image ◽  
Needle Interventions

Purpose: Augmented reality overlay systems can be used to project a CT image directly onto a patient during procedures. They have been actively trialed for computer-guided procedures, however they have not become commonplace in practice due to restrictions of previous systems. Previous systems have not been handheld, and have had complicated calibration procedures. We put forward a handheld tablet-based system for assisting with needle interventions. Methods: The system consists of a tablet display and a 3-D printed reusable and customizable frame. A simple and accurate calibration method was designed to align the patient to the projected image. The entire system is tracked via camera, with respect to the patient, and the projected image is updated in real time as the system is moved around the region of interest. Results: The resulting system allowed for 0.99mm mean position error in the plane of the image, and a mean position error of 0.61mm out of the plane of the image. This accuracy was thought to be clinically acceptable for tool using computer-guidance in several procedures that involve musculoskeletal needle placements. Conclusion: Our calibration method was developed and tested using the designed handheld system. Our results illustrate the potential for the use of augmented reality handheld systems in computer-guided needle procedures. 

scholarly journals A regional bolus tracking and real‐time B 1 calibration method for hyperpolarized 13 C MRI

2018 ◽  
Vol 81 (2) ◽  
pp. 839-851 ◽  
Author(s):  
Shuyu Tang ◽  
Eugene Milshteyn ◽  
Galen Reed ◽  
Jeremy Gordon ◽  
Robert Bok ◽  
...  
Keyword(s):  
Real Time ◽  
Calibration Method ◽  
Bolus Tracking

scholarly journals A specialized motion capture system for real-time analysis of mandibular movements using infrared cameras

2013 ◽  
Vol 12 (1) ◽  
Author(s):  
Daniel Antônio Furtado ◽  
Adriano Alves Pereira ◽  
Adriano de Oliveira Andrade ◽  
Douglas Peres Bellomo ◽  
Marlete Ribeiro da Silva
Keyword(s):  
Real Time ◽  
Motion Capture ◽  
Motion Capture System ◽  
Time Analysis ◽  
Real Time Analysis ◽  
Infrared Cameras ◽  
Mandibular Movements

scholarly journals Attitude Determination with Magnetometers and Accelerometers to Use in Satellite Simulator

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Helio Koiti Kuga ◽  
Valdemir Carrara
Keyword(s):  
Real Time ◽  
Attitude Control ◽  
Attitude Determination ◽  
Positional Information ◽  
Calibration Method ◽  
Artificial Satellites ◽  
Time Operation ◽  
Determination Process ◽  
Real Time Operation ◽  
Mems Technology

Attitude control of artificial satellites is dependent on information provided by its attitude determination process. This paper presents the implementation and tests of a fully self-contained algorithm for the attitude determination using magnetometers and accelerometers, for application on a satellite simulator based on frictionless air bearing tables. However, it is known that magnetometers and accelerometers need to be calibrated so as to allow that measurements are used to their ultimate accuracy. A calibration method is implemented which proves to be essential for improving attitude determination accuracy. For the stepwise real-time attitude determination, it was used the well-known QUEST algorithm which yields quick response with reduced computer resources. The algorithms are tested and qualified with actual data collected on the streets under controlled situations. For such street runaways, the experiment employs a solid-state magnetoresistive magnetometer and an IMU navigation block consisting of triads of accelerometers and gyros, with MEMS technology. A GPS receiver is used to record positional information. The collected measurements are processed through the developed algorithms, and comparisons are made for attitude determination using calibrated and noncalibrated data. The results show that the attitude accuracy reaches the requirements for real-time operation for satellite simulator platforms.

Integrated real-time polarization image sensor based on UV-NIL and calibration method

2022 ◽  
pp. 1-1
Author(s):  
Chuanlong Guan ◽  
Ran Zhang ◽  
Jinkui Chu ◽  
Ze Liu ◽  
Yuanyi Fan ◽  
...  
Keyword(s):  
Real Time ◽  
Calibration Method ◽  
Image Sensor ◽  
Polarization Image

Reseach on calibration method of double-channel thermal-infrared standard radiometer

2018 ◽  
Vol 47 (4) ◽  
pp. 404002 ◽  
Author(s):  
谢臣瑜 Xie Chenyu ◽  
李健军 Li Jianjun ◽  
庞伟伟 Pang Weiwei ◽  
夏茂鹏 Xia Maopeng ◽  
郑小兵 Zheng Xiaobing
Keyword(s):  
Thermal Infrared ◽  
Calibration Method ◽  
Double Channel

Real-time self-adaptive calibration method for high speed acquisition system

2019 ◽  
Vol 90 (1) ◽  
pp. 015118 ◽  
Author(s):  
Hao Zeng ◽  
Peng Ye ◽  
Wentao Wei ◽  
Lianping Guo ◽  
Huiqing Pan ◽  
...  
Keyword(s):  
Real Time ◽  
High Speed ◽  
Calibration Method ◽  
Acquisition System ◽  
Adaptive Calibration ◽  
Self Adaptive
Sign in / Sign up

Export Citation Format

Share Document