Perspective Geometry Based Single Image Camera Calibration

Avinash, N; Murali, S.

doi:10.1007/s10851-007-0052-3

Cited by 13 publications

(5 citation statements)

References 15 publications

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“…Wu et al [7] adopted RANSAC algorithm along with vanishing points and lines. The latest work on this approach is by Avinash and Murali [8] who propose a method of containing a rectangular prism. The rectangular prism is used to generate two vanishing points.…”

Section: Related Workmentioning

confidence: 99%

“…Y=a + bx + cx 2 + dx 3 (8) where a is the initial intercept; b, c and d are the partial regression coefficients for variables x, x 2 and x 3 . The general principles of polynomial regression are the fitted model and is more reliable when it is built on large number of observations and do not extrapolate beyond the limits of observed values.…”

Section: Polynomial Regression Analysismentioning

confidence: 99%

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Estimating Intrinsic Parameter of Camera from a Single Image

Kiran¹,

Murali²

2015

Second International Conference on Advances in Computing, Control and Networking - ACCN 2015

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In this paper, an intrinsic parameter of camera from a single image is formulated. Compared to other techniques which use two or three orthogonal planes, parallelograms, rectangles, conic circles and balls, the proposed technique is easy to use and flexible. Calculation of the focal length using a single image is the main objective of this research work. A stick is employed as the calibration object to formulate the equations in order to compute the focal length. The arrangement of the calibration object to acquire the images adds more accuracy in computing the focal length of the camera. The length of the calibration object is the major cue in computing the focal length. A novel approach using polynomial regression is attempted in formulating the cubic polynomials based on the length of the calibration object. The results are tabulated and further used in formulating equation to compute the focal length of the camera. Experimental results are tabulated to show the accuracy of the proposed approach.

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Section: Related Workmentioning

confidence: 99%

Section: Polynomial Regression Analysismentioning

confidence: 99%

Estimating Intrinsic Parameter of Camera from a Single Image

Kiran¹,

Murali²

2015

Second International Conference on Advances in Computing, Control and Networking - ACCN 2015

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“…Some recent examples were given by Kim and Kweon (2009), Zhao and Liu (2010) and Lu and Payandeh (2010). Further methods, which consider the geometrical properties of perspective, are based on the position of vanishing points of the image (Grammatikopulos et al, 2007;Avinash and Murali, 2008;He and Li, 2008). Solar shadows were also used by Kawasaki and Furukawa (2009), Junejo and Foroosh (2010) and Wu et al (2010) to correct distortion from images.…”

Section: Influence Of Photograph Distortionmentioning

confidence: 99%

An improved photographic method to estimate the shading effect of obstructions

Orioli

Gangi

2012

Solar Energy

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A new photographic method is presented to evaluate the shading effects of obstructions on surfaces exposed to the sun. The method overcomes the difficulties caused by the need to accurately describe the surrounding objects to estimate the shading effects by means of the usual tools that use the spatial reconstruction of obstructions or cylindrical or polar suncharts. The photographs of the surrounding objects are used as the background on which the solar disc is depicted at the various hours of the day. In this way it is easily detectable if the sun is visible from the place where the photographs were taken or if the surrounding obstructions obscure the sun. In spite of the complex mathematical background of the new method, the practical application of the procedure is very simple, and only requires the measurements of three angles for each photograph. The procedure permits to verify the suitability of a generic site for solar exploitation; its main benefit is the simplicity of use and the transparency of the obtained results. This method is particularly useful to evaluate the technical feasibility of small solar systems installed on the buildings of densely urbanised cities.\ud The accuracy of the method was tested by performing an experimental verification in the field. For this purpose, the sun was photographed at different hours of the day. The photographed solar discs and the calculated sun’s positions were compared. The differences between the photographed and calculated sun’s positions corresponded to small time lags that do not exceed few minutes in the worst case. To further investigate the reliability of the proposed method, the impact of image distortion, which always affects all methods that use cameras to get information about the photographed reality, was also examined

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“…Simplified intrinsic camera calibration and hand-eye calibration for robot vision was carried out by Malm and Heyden in 2003. Perspective Geometry based single image camera calibration technique has been discussed by Avinash andMurali in 2008. In 2006, Yanqing and Zhiyan came out with a flexible camera calibration method for computer visual 3d reconstruction system.…”

Section: Related Workmentioning

confidence: 99%

Improvement in quality testing of Braille printer output with Euclidean distance measurement using camera calibration

Karmakar¹,

Chatterjee²,

Dutta³

2010

Int. J. Eng. Sci. Tech

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This paper focuses on quality testing of Braille printed paper using calibrated camera by detecting dots and measuring the Euclidean distances between them with equal gap, vertically and horizontally. For higher accuracy, camera calibration is essential to observe a planar checker board pattern from different distances and orientations. In this process, the position of the camera is fixed and the pattern can be freely moved. Radial lens distortion is modeled. Machine simulation and experimental results have also been discussed. Quality improvement can be achieved by giving a feedback after finding the distorted edges from image processing of the paper. This approach thus definitely helps the blind reader to avoid disturbances in reading the printed documents by both, single sided and inter-point printer.

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Perspective Geometry Based Single Image Camera Calibration

Cited by 13 publications

References 15 publications

Estimating Intrinsic Parameter of Camera from a Single Image

Estimating Intrinsic Parameter of Camera from a Single Image

An improved photographic method to estimate the shading effect of obstructions

Improvement in quality testing of Braille printer output with Euclidean distance measurement using camera calibration

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