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Rendering algorithms for aberrated human vision simulation

Visual Computing for Industry,Biomedicine,and Art 2023年第1期6卷 51-75页

作者： István Csoba Roland Kunkli Faculty of Informatics University of DebrecenDebrecen 4028Hungary Doctoral School of Informatics University of DebrecenDebrecen 4028Hungary

vision-simulated imagery―the process of generating images that mimic the human visual system―is a valuable tool with a wide spectrum of possible applications, including visual acuity measurements, personalized planning of corrective lenses and surgeries, vision-correcting displays, vision-related hardware development, and extended reality discomfort reduction. A critical property of human vision is that it is imperfect because of the highly influential wavefront aberrations that vary from person to person. This study provides an overview of the existing computational image generation techniques that properly simulate human vision in the presence of wavefront aberrations. These algorithms typically apply ray tracing with a detailed description of the simulated eye or utilize the point-spread func-tion of the eye to perform convolution on the input image. Based on the description of the vision simulation tech-niques, several of their characteristic features have been evaluated and some potential application areas and research directions have been outlined.

关键词： human vision human visual system vision simulation Wavefront aberrations Visual aberrations vision-realistic rendering

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A VIDEO SPECTRUM SPLITTING ENCODING SCHEME BASED ON human vision AND ITS COMPUTER SIMULATION

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Transactions of Tianjin University 1995年第1期1卷 79+76-79页

作者：赵宇李华俞斯乐滕建辅天津大学电视与图象信息研究所

In this paper, a 3-D video encoding scheme suitable for digital TV/HDTV (high definition television) is studied through computer simulation. The encoding scheme is designed to provide a good match to human vision. Basically, this involves transmission of low frequency luminance information at full frame rate for good motion rendition and transmission of high frequency luminance signal at reduced frame rate for good detail in static images.

关键词： D video encoding discrete wavelet transform human vision computer simulation

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Future Trends in Computer Graphics： How Much is Enough？

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Journal of Computer Science & Technology 2003年第5期18卷 531-537页

作者： A.R.Forrest SchoolofComputingSciences UniversityofEastAngliaNorwichU.K.

Over the forty-year history of interactive computer graphics, there have beencontinuous advances, but at some stage this progression must terminate with images beingsufficiently realistic for all practical purposes. How much detail do we really need? Polygon countsover a few million imply that on average each polygon paints less than a single pixel, making useof polygon shading hardware wasteful. We consider the problem of determining how much realism isrequired for a variety of applications. We discuss how current trends in computer graphics hardware,and in particular of graphics cards targeted at the computer games industry, will help or hinderachievement of these requirements. With images now being so convincingly realistic in many cases,critical faculties are often suspended and the images are accepted as correct and truthful althoughthey may well be incorrect and sometimes misleading or untruthful. Display resolution has remainedlargely constant in spatial terms for the last twenty years and in terms of the number of pixels hasincreased by less than an order of magnitude. If the long-promised breakthroughs in displaytechnology are finally realised, how should we use the increased resolution?

关键词： computer graphics displays graphics hardware human vision point-basedmodelling

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Influence on Visibility Due to Differences of Guide Wire Movement―Visual &Physical Evaluations

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Open Journal of Applied Sciences 2020年第10期10卷 577-591页

作者： Hisaya Sato Daisuke Kittaka Miwa Ohsawa Kyoichi Kato Graduate School of Health Sciences Showa University Tokyo Japan Department of Radiological Technology Showa University Hospital Tokyo Japan Department of Radiological Technology Showa University Fujigaoka Hospital Yokohama Japan Department of Unification Radiological Technology Showa University Tokyo Japan

The visibility of moving images during cardiac catheterization and treatment may be reduced by a number of factors. First, it involves multiple movements that occur simultaneously, such as the movements due to the heart beat and movement of the guide wire used during the treatment. There is also the influence of the X-ray dose on the image quality in the X-ray output. If X-rays are irradiated onto moving objects such as a guide wire moving during treatment of the heart, cardiac catheterization may be displaced to the next image recorded even when an insufficient X-ray dose has been irradiated because the imaged object is moving during the time the X-rays are emitted (pulse width). If the X-ray dose planned to be irradiated to the target is low, there is also the possibility that noise will appear in the image, and the imaged object may be lost in noise and visibility be reduced. For this reason, we conducted basic research into how changes in the speed of rotation of guide wires affect visibility when wires are positioned horizontally and vertically, using a dynamic phantom and recorded X-ray moving images. The purpose of this study is to elucidate whether the deterioration in the visibility is affected by the X-ray dose, the orientation or movement of a guide wire, or caused by other conditions, in order to contribute to improving the visibility in the X-ray moving images. The results showed a lower visual evaluation only in the vertical direction at the more rapid movement here, but this did not result in significant changes in the physical evaluation. This suggests that the structure and characteristics of the human eyes would be involved, as human vision is stronger with lateral movements and weaker with vertical movements due to the arrangement of the human eyes, side by side. Findings from this basic study can be utilized to improve the visibility in the X-ray moving images by paying attention to the observation environment of the observer of the X-ray moving

关键词： X-Ray Moving Images Visibility human vision Guide Wire

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