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Photometric camera characterization from a single image with invariance to light intensity and vignetting
Computer Vision and Image Understanding ( IF 4.5 ) Pub Date : 2019-12-13 , DOI: 10.1016/j.cviu.2019.102887
Pedro M.C. Rodrigues , João P. Barreto , Michel Antunes

Photometric characterization of a camera entails describing how the camera transforms the light reaching its sensors into an image and how this image can be defined in a standard color space. Although the research in this area has been extensive, the current literature lacks practical methods designed for cameras operating under near light. There are two major application scenarios considered in this paper that would benefit from this type of approaches. Camera rigs for minimally-invasive-procedures cannot be calibrated in the operating room with the current methods. This comes from the fact that existing approaches need multiple images, assume uniform lighting, and/or use over-simplistic camera models, which does not allow for the calibration of near light setups in a fast and reliable way. The second scenario refers to the calibration of cellphone cameras, which currently cannot be calibrated at close range with a single image, specially if the flash is used, as there would be non-uniform lighting on the scene. In this work, we describe a method to characterize cameras from a single image of a known target. This enables both geometric and photometric calibrations to be performed on-the-fly without making assumptions on the vignetting nor on the spatial properties of the light. The presented method showed good repeatability and color accuracy even when compared to multiple-image approaches. Applications to laparoscopic cameras, generic cameras (such as cellphone cameras), and cameras other than trichromatic are shown to be viable.



中文翻译:

从单一图像到光强和渐晕的光度相机特性描述

相机的光度表征需要描述相机如何将到达其传感器的光转换为图像,以及如何在标准色彩空间中定义该图像。尽管在该领域的研究已经广泛,但是当前文献缺乏为近光下操作的相机设计的实用方法。本文考虑了两种主要的应用方案,它们将从这种方法中受益。使用当前方法无法在手术室中校准用于微创手术的摄像机装备。这是因为现有方法需要多个图像,采用统一照明和/或使用过于简单的相机模型,这不允许以快速,可靠的方式校准近光设置。第二种情况涉及对手机相机的校准,目前无法通过单个图像在近距离上对其进行校准,尤其是在使用闪光灯的情况下,因为场景中照明不均匀,因此尤其如此。在这项工作中,我们描述了一种从已知目标的单个图像中表征摄像机特征的方法。这样就可以即时进行几何和光度校准,而无需对渐晕或光的空间特性进行假设。所提出的方法即使与多图像方法相比也显示出良好的可重复性和色彩准确性。腹腔镜照相机,通用照相机(例如手机照相机)和除三基色以外的照相机的应用被证明是可行的。特别是如果使用闪光灯,因为场景中会出现不均匀的光线。在这项工作中,我们描述了一种从已知目标的单个图像中表征摄像机特征的方法。这样就可以即时进行几何和光度校准,而无需对渐晕或光的空间特性进行假设。所提出的方法即使与多图像方法相比也显示出良好的可重复性和色彩准确性。腹腔镜照相机,通用照相机(例如手机照相机)和除三基色以外的照相机的应用被证明是可行的。特别是在使用闪光灯的情况下,因为场景中光线会不均匀。在这项工作中,我们描述了一种从已知目标的单个图像中表征摄像机特征的方法。这样就可以即时进行几何和光度校准,而无需对渐晕或光的空间特性进行假设。所提出的方法即使与多图像方法相比也显示出良好的可重复性和色彩准确性。腹腔镜照相机,通用照相机(例如手机照相机)和除三基色以外的照相机的应用被证明是可行的。这样就可以即时进行几何和光度校准,而无需对渐晕或光的空间特性进行假设。所提出的方法即使与多图像方法相比也显示出良好的可重复性和色彩准确性。腹腔镜照相机,通用照相机(例如手机照相机)和除三基色以外的照相机的应用被证明是可行的。这样就可以即时进行几何和光度校准,而无需对渐晕或光的空间特性进行假设。所提出的方法即使与多图像方法相比也显示出良好的可重复性和色彩准确性。腹腔镜照相机,通用照相机(例如手机照相机)和除三基色以外的照相机的应用被证明是可行的。

更新日期:2020-01-04
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