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Virtual Control of Optical Axis of the 3DTV Camera for Reducing Visual Fatigue in Stereoscopic 3DTV

ETRI journal, v.26 no.6, 2004년, pp.597 - 604  

Park, Jong-Il (Division of Electrical and Computer Engineering, Hanyang University) ,  Um, Gi-Mun (Digital Broadcasing Research Division, ETRI) ,  Ahn, Chung-Hyun (Digital Broadcasing Research Division, ETRI) ,  Ahn, Chie-Teuk (Digital Broadcasing Research Division, ETRI)

Abstract AI-Helper 아이콘AI-Helper

In stereoscopic television, there is a trade-off between visual comfort and 3-dimensional (3D) impact with respect to the baseline-stretch of a 3DTV camera. It is necessary to adjust the baseline-stretch at an appropriate the distance depending on the contents of a scene if we want to obtain a subje...

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제안 방법

  • However, it is interesting to point out that the small artifacts around these occlusion areas are not vey perceptible if the images are shown in the stereoscopic display, which justifies the effectiveness of the proposed method. As a final step of our test, we performed a subjective evaluation in the laboratory. In this test, the original images (baseline strstch = L) and various synthesized images (baseline stretch = 0.
  • In this paper, we propose a novel optical axis control technique that controls the position of optical axis of a 3DTV camera by synthesizing the virtual views between two TV cameras. Figur3 1 illustrates the concept of the proposed system.
  • We have observed similar tendencies in the results of applying the proposed technique to various stereo images. It is interesting to notice that the quality of the disparity map is relatively poor in textureless areas but the quality of the synthesized images is not degraded, which convinces us of the effectiveness of the proposed technique.
  • The virtual control of the optical axis is a first step toward a versatile framework of post-processing for providing comfortable stereoscopic contents. It would be interesting as a future work to analyze various mutually affecting factors on visual comfortableness and 3D impact in stereoscopic images, such as focal length, convergence angle, resolution, and the distance to main objects using a more rigorous subjective assessment with a sufficient number of subjects evaluating a large set of stereoscopic images.
  • The performance of the proposed technique presented in the preceding sections is verified by applying it to various stereoscopic images ranging from well-known database images (3D image databases of Univ. of Tsukuba and ITE Japan) to indoor and outdoor images taken by a set of 3DTV cameras with broadcasting quality. Wfe implemented the proposed technique using Microsoft Visual C++.
  • The proposed optical axis control technique consists of two steps: a hierarchical stereo matching with an edge-adaptive shifted matching window, and a virtual view synthesis. In section Ⅱ, we first describe the hierarchical stereo matching algorithm with an edge-adaptive shifted matching window scheme for obtaining a disparity map.
  • To evaluate the performance of the proposed technique, we tried to quantitatively measure the quality of the computed disparity map. We compute the following quality measure based on known ground truth data.

대상 데이터

  • As a final step of our test, we performed a subjective evaluation in the laboratory. In this test, the original images (baseline strstch = L) and various synthesized images (baseline stretch = 0.8 L, 0.6 L, 0.4 L, 0.2 L, and 0) are displayed on a stereoscopic display (VRJoy shutter glass on a 21" CRT monitor). A total of five subjects were asked to score their opinions from 1 to 5 in terms of comfortableness, 3D impact, image quality, and preference among the original and processed images.
  • One of the key issues in realizing 3DTV is to reduce visual fatigue while maintaining sufficient 3D reality. A binocular 3DTV camera, which is mostly used in a conventional 3DTV system, consists of two cameras. A well-known problem in a conventional 3DTV system is that visual comfort degrades while the 3D impact enhances when increasing the baselinestretch (defined as the distance between the two cameras) of the 3DTV camera.

데이터처리

  • Then, virtual views are efficiently synthesized using the disparity map. The proposed method is verified by computer simulation. The simulation results for various stereoscopic images showed visually compelling virtual views.

이론/모형

  • The algorithm assumes parallel cameras. When the optical axes of the cameras are not parallel, they can be made parallel in most of the stereo setups assumed in this paper by applying a rectification algorithm [4].
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