Optimized calibration method for ultra-field dual bands cameras based on thermal radiation checkerboard

Zhang, Shuai; Huang, Fuyu; Liu, Bingqi; Zhong, Huiling; Li, Gang; Chen, Yichao; Wang, Ziang

doi:10.1016/j.infrared.2020.103346

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…From above equations of [ [1] , [2] , [3] , [4] ], the network energy function can be constructed as follows [ 19 , 24 ].

where

is the output voltage of the neuron and

is the input current.…”

Section: The Njpda Methodsmentioning

confidence: 99%

“…Otherwise, continue the iterations. Based on the association probability

, use Kalman filtering for tracking and filtering, hence predict the target state at the next moment, and then return to step [ 2 ]. Repeat the above steps to achieve continuous target tracking.…”

Section: The Direction Information Fused Njpda Methodsmentioning

confidence: 99%

“…Infrared fish-eye warning system not only has the advantages of passive detection, to be highly concealed and not easy to be disturbed, but also can sense the threats from different directions in hemispheric airspace in real time. It will have a broad application in the future high-tech war [ [1] , [2] , [3] , [4] ]. Multi-target tracking is one of the main functions of infrared fish-eye warning system.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research on multi-target data association of the infrared fish-eye warning system

Zhou,

Fang,

et al. 2023

Heliyon

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“…From above equations of [ [1] , [2] , [3] , [4] ], the network energy function can be constructed as follows [ 19 , 24 ].

where

is the output voltage of the neuron and

is the input current.…”

Section: The Njpda Methodsmentioning

confidence: 99%

“…Otherwise, continue the iterations. Based on the association probability

Section: The Direction Information Fused Njpda Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on multi-target data association of the infrared fish-eye warning system

Zhou,

Fang,

et al. 2023

Heliyon

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“…In other studies, polyethylene backplane was used to print the calibration board on the surface, and aluminum foil tape was used to cover the white area of the calibration board to enhance the difference in reflectivity and thus improve the infrared imaging effect [11] . With the updating of technical means, checkerboard is made by laser engraving on aluminum based two-color plates [12] , and more refined methods such as UV printing are developed on sandblasted aluminum plates [3,13,14,15] .…”

Section: Recent Workmentioning

confidence: 99%

Research on calibration method of infrared camera based on thermal radiation enhancement

Zhao,

Cao

2024

International Conference on Frontiers of Applied Optics and Computer Engineering (AOCE 2024)

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Infrared camera is a photoelectric device that obtains temperature by detecting thermal radiation. With the need of multisensor fusion application, the accurate acquisition of camera parameters has become an important topic. Based on Zhang Zhengyou's calibration method, infrared thermal radiation is used to enhance the reflectivity of the calibration plate. The asymmetric circle is used as the calibration pattern and the circle center is used as the calibration feature. The preprocessing method of calibration image is designed by contrast experiment. The preparation of calibration image is completed through two steps of image contrast enhancement and image binarization under uneven illumination. The error rate of infrared camera calibration reaches 0.04%. This method avoids complex active infrared calibration plate making, improves the problem of difficult extraction of corner features in infrared images, and solves the infrared calibration problem with simple and easy to obtain tools, and obtains sufficient accuracy

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“…Geometric calibration was performed indoors, without external heating on long-wave infrared (LWIR) and mid-wave infrared (MWIR) cameras. Other recent targets involved painting the square checkerboard pattern on aluminum plates and using Peltier modules, also known as thermoelectric modules, fixed at the back of the calibration rig to either heat and cool the black and white painted squares, respectively [ 39 ], or to heat the entire calibration board [ 40 ]. Some studies made use of the high thermal conductivity and very low emissivity properties of copper, by milling square checkers on a printed circuit board (PCB) while using a hair dryer to heat the target [ 41 ], spraying highly emissive black ink squares on a copper plate and exposing the checkerboard target to sunlight [ 42 ]; alternately, polished copper squares were printed on an epoxy plate, and then the target was placed on a heated ceramic tile and an ice block to assess whether heating or cooling the pattern will result in a higher contrast thermal image and more accurate calibration results [ 43 ].…”

Section: Literature Reviewmentioning

confidence: 99%

Infrared Camera Geometric Calibration: A Review and a Precise Thermal Radiation Checkerboard Target

Elsheikh

Abu-Nabah

Hamdan

et al. 2023

Sensors

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Different infrared (IR) planar geometric calibration targets have been developed over the years that exploit a well-established and flexible optical camera geometric calibration procedure following the pinhole approximation. This geometric calibration is typically neglected in IR cameras, due to the relatively low resolution of thermal images and the complex IR targets needed for the geometric calibration in comparison to the optical targets. In this study, a thorough literature review of numerous IR camera geometric calibration targets, along with their respective outcomes, were summarized and leveraged to deliver a practical checkerboard target for less experienced end users, while offering the lowest reprojection errors. It was concluded that the fabrication of high emissivity contrast and precise square points of intersection within a checkerboard pattern extends the accuracy of capturing these control points in a thermal image for an optimized IR camera geometric calibration. Accordingly, two simple planar checkerboard targets were fabricated using laser engraving and ultraviolet (UV) printing technologies on a polished stainless steel (SS304) plate. The UV-printed checkerboard target on a polished metallic alloy delivered the lowest mean reprojection error (MRE) of 0.057 pixels and the lowest root mean square error (RMSE) of reprojection of 0.063 pixels, with a standard deviation lower than 0.003 pixels. The UV-printed design offers better accuracy than any other checkerboard calibration target, and comparable results to the best prominent circular pattern results reported in the literature.

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Optimized calibration method for ultra-field dual bands cameras based on thermal radiation checkerboard

Cited by 9 publications

References 19 publications

Research on multi-target data association of the infrared fish-eye warning system

Research on multi-target data association of the infrared fish-eye warning system

Research on calibration method of infrared camera based on thermal radiation enhancement

Infrared Camera Geometric Calibration: A Review and a Precise Thermal Radiation Checkerboard Target

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