Distortion correction using a single image based on projective invariability and separate model

Zhou, Fuqiang; Cui, Yi; Liu, Liu; He, Gaohong

doi:10.1016/j.ijleo.2012.09.038

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…To better reflect the real image, geometric distortion calibration was performed. The Hough transformation method was used to find the four distortion calibration points of the rectangular calibration plate in the distorted image [18]. The system first found the outline of the rectangular calibration plate, and then used the approxPolyDP function to specify the precision to approximate the contour of the rectangular calibration plate, and fit the points on the contour of the rectangular calibration plate to four corner points.…”

Section: Methodsmentioning

confidence: 99%

A Plant Leaf Geometric Parameter Measurement System Based on the Android Platform

Liu

Tao

et al. 2019

Sensors

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Automatic and efficient plant leaf geometry parameter measurement offers useful information for plant management. The objective of this study was to develop an efficient and effective leaf geometry parameter measurement system based on the Android phone platform. The Android mobile phone was used to process and measure geometric parameters of the leaf, such as length, width, perimeter, and area. First, initial leaf images were pre-processed by some image algorithms, then distortion calibration was proposed to eliminate image distortion. Next, a method for calculating leaf parameters by using the positive circumscribed rectangle of the leaf as a reference object was proposed to improve the measurement accuracy. The results demonstrated that the test distances from 235 to 260 mm and angles from 0 to 45 degrees had little influence on the leafs’ geometric parameters. Both lab and outdoor measurements of leaf parameters showed that the developed method and the standard method were highly correlated. In addition, for the same leaf, the results of different mobile phone measurements were not significantly different. The leaf geometry parameter measurement system based on the Android phone platform used for this study could produce high accuracy measurements for leaf geometry parameters.

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Section: Methodsmentioning

confidence: 99%

A Plant Leaf Geometric Parameter Measurement System Based on the Android Platform

Liu

Tao

et al. 2019

Sensors

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“…De forma geral, as distorções causadas pelos sistemas de lentes são maiores e comumente conhecidas como distorções radial simétrica e descentrada. Conforme Zhou et al (2013), estas distorções provêm de imperfeições no processo de fabricação e as correções são efetuadas mediante parâmetros calculados no processo de calibração (YANAGI; CHIKATSU, 2015)…”

Section: Transformação Para O Referencial Fotogramétrico Sem Distorçõesunclassified

Extração de informações cartográficas planimétricas pela transformação linear direta com emprego de imagem obtida por aeronave remotamente pilotada

Euriques

Mitishita²,

Razoto³

et al. 2022

REGNE

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Tradicionalmente na Fotogrametria a extração de informações cartográficas tridimensionais envolve o uso de no mínimo duas imagens. O uso de uma imagem possibilita obter informações planimétricas, porém, dados de altimetria externos são necessários. A modelagem destas informações pode ser feita rigorosamente através das Equações de Colinearidade (CLN), que requer o uso de parâmetros de calibração da câmera e tratamento dos erros sistemáticos. Alternativamente, transformações generalizadas como a Direct Linear Transform (DLT) podem ser usadas. Neste trabalho apresenta-se um estudo que avaliou o desempenho da DLT e CLN na extração de informações cartográficas com o uso de uma imagem obtida por câmera de baixo custo acoplada a uma aeronave remotamente pilotada. Obteve-se valores máximos de discrepância planimétrica em torno de 0,80 m para ambas as modelagens. O RMSE das discrepâncias planimétricas foi de 0,53 m pelas CLN e 0,56 m pela DLT. A qualidade cartográfica (PEC-PCD) se enquadrou na Classe A pelas CLN e B pela DLT, na escala 1:10000. A DLT apresentou eficiência de 90% na obtenção de coordenadas em relação as CLN, tendo vantagens operacionais, além de não requerer parâmetros da câmera, o que amplia a possibilidade do emprego de equipamentos de baixo custo.

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“…In terms of researches on the image distortion correction, in 1966, the research results of CCD image distortion correction published by Hallert firstly adopt the least square method to realize the data processing [4]. In 1975, Faig considered various factors causing distortion during the CCD imaging, set up relatively sophisticated imaging model and solved by using the nonlinear optimization method [5].…”

Section: Introductionmentioning

confidence: 99%

A solution method for image distortion correction model based on bilinear interpolation

Li¹,

Su²,

Zeng³

2019

Computer Optics

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In the process of the image generation, because the imaging system itself has differences in terms of nonlinear or cameraman perspective, the generated image will face the geometric distortion. Image distortion in general is also a kind of image degradation, which needs the geometric transform to correct each pixel position of the distorted images, so as to regain the original spatial relationships between pixels and the original grey value relation, and which is also one of important steps of image processing. From the point of view of the digital image processing, the distortion correction is actually a process of image restoration for a degraded image. In image processing, in terms of the image quality improvement and correction technology, namely the image restoration, with the wide expansion of digital image distortion correction processing applied, the processing technology of the image restoration has also become a research hotspot. In view of the image distortion issue, this paper puts forward the image distortion correction algorithm based on two-step and one-dimensional linear gray level interpolation to reduce the computation complexity of the bilinear interpolation method, and divide the distorted image into multiple quadrilaterals, and the area of the quadrilateral is associated with the distortion degree of the image in the given region, and express the region distortion of each quadrilateral with the bilinear model, thus determining parameters of bilinear model according to the position of the quadrilateral vertex in the target image and the distorted image. Experiments show that such algorithm in this paper can meet the requirements of distortion correction of most lenses, which can accurately extract the distorted edge of the image, thus making the corrected image closer to the ideal image.Keywords: image distortion, bilinear interpolation, correction model. Citation: Li J, Su J, Zeng X. A solution method for image distortion correction model based on bilinear interpolation.

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Distortion correction using a single image based on projective invariability and separate model

Cited by 6 publications

References 15 publications

A Plant Leaf Geometric Parameter Measurement System Based on the Android Platform

A Plant Leaf Geometric Parameter Measurement System Based on the Android Platform

Extração de informações cartográficas planimétricas pela transformação linear direta com emprego de imagem obtida por aeronave remotamente pilotada

A solution method for image distortion correction model based on bilinear interpolation

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