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The success of a new display technology such as plasma is strongly related to the final picture quality assessed by the customer's eyes. The human visual system (HVS) characteristics enable the definition of new cost‐efficient methods to significantly reduce the visibility of all plasma‐specific artifacts. Simple optimized encoding methods based on the luminance perception will be presented as well as more‐complicated algorithms based on motion perception. 相似文献
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Y. Kuroki T. Nishi S. Kobayashi H. Oyaizu S. Yoshimura 《Journal of the Society for Information Display》2007,15(1):61-68
Abstract— The ideal frame rate for the highest motion‐image quality with respect to blur and jerkiness is presented. In order to determine the requirements for avoiding these impairments, motion images from a high‐speed camera and computer graphics were combined with a high‐speed display to perform a psychophysical evaluation. The camera, operating at 1000 fps, and image processing were used to simulate various frame rates and shutter speeds, and a 480‐Hz CRT display was used to present motion images simulating various frame rates and time characteristics of the display. Subjects were asked to evaluate the difference in quality between motion images at various frame rates. A frame rate of 480 fps was chosen to be an appropriate reference frame rate that, as a first estimation, enables coverage up to the human‐dynamic‐resolution (HDR) limit based on another experiment using real moving charts. The results show that a frame rate of 120 fps provides good improvement compared to that of 60 fps, and that the maximum improvement beyond which evaluation is saturated is found at about 240 fps for representative standard‐resolution natural images. 相似文献
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Taiichiro Kurita 《Journal of the Society for Information Display》2010,18(12):1044-1050
Abstract— The motion image quality of video systems with hold‐type displays, such as LCDs or OLEDs, were studied with regard to dynamic spatial frequency response and data from subjective evaluations on motion blur. The system parameters of motion image quality, or frame rate (F) and temporal aperture (At), were investigated and their required values were derived. A smaller temporal aperture and/or higher frame rate can improve the dynamic response and motion image quality, but the parameters required in order to maintain a good dynamic response for high motion image velocity seems very difficult to implement, such as a frame rate of 900 Hz. Therefore, the performance goal of video systems is set on “limit of acceptance” for motion image quality, as a compromise. An equation or the relational expression between motion image velocity and required parameter values is derived based on dynamic response and data from subjective evaluations found in published studies. Possible examples of parameter sets are obtained from the equation. Those are (F = 300 Hz, At = 5/6), (F = 240 Hz, At = 2/3), (F = 120 Hz, At = 1/3), and (F > 360 Hz, At = 1). 相似文献
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为了提高医学图像中面部轮廓线的分割效果,提出一种新的面部轮廓线生成算法(bidirectional contour tracking,BCT).该算法首先利用边缘检测算法对CT图像进行检测,然后利用头部CT图像中各组织的灰度特征和图像的对称性,对检测后的图像进行双向轮廓跟踪,并获得面部的轮廓线.另外,根据面部轮廓线的特点,使用中点法可生成辅助轮廓线.以一组颅脑CT图像为例来验证算法的效果,实验结果表明,新的生成算法提高了轮廓线的生成速度,并有很好的分割效果. 相似文献
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In recent years, there has been wide‐spread use of large and high‐resolution liquid‐crystal displays (LCDs) on handheld devices. The portion of LCD power consumption in the overall system has gradually increased. While most of the previous research on LCD power management has focused on the hardware level, practical mechanisms at the software level are hardly known. This paper presents a power‐aware LCD management mechanism, based on dynamic refresh‐rate scaling and frame buffer monitoring. The proposed mechanism guarantees the display quality of service, which is inherently specified by content types. The mechanism does not require additional hardware or modifications to applications. The experiment results—on a commercial PDA with a resolution—show that the proposed mechanisms effectively reduce the power consumption by up to 10%, while satisfying the display quality requirements for the LCD screen. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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A virtual pixel technique increases the resolution of spatially discrete pixilated display devices when the eye moves relative to the screen. By using this technique, an effective PDP resolution can be doubled for moving images. For instance, 1280‐horizontal‐pixel data can be displayed on a VGA PDP having only 640 horizontal pixels. The positions and sizes of the virtual pixels are controlled by choosing light‐emission timings and durations of the actual pixels as their images move across the retina. 相似文献
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Toshikazu Matsui 《Journal of the Society for Information Display》2012,20(7):367-379
This paper clarifies the relationship between image quality and accommodation in human vision through two types of experiments. One examines how image‐quality degradation influences the accommodation mechanism, and the other examines which type of information of quality‐degraded images activates the accommodation mechanism. Actually, accommodative responses are measured using an infrared optometer while subjects are subjectively evaluating sharpness, noise, and pseudo‐contours and while they are observing sine, square, and missing fundamental (MF) square waves. The following results were derived: (1) the accommodation lag increases as the degree of sharpness is degraded regardless of the tone‐reproducing methods; (2) the accommodation lag decreases considerably in the existence of noise or pseudo‐contours, whereas it increases for uniform or gently curved planes; (3) the spatial features of presented images activate the accommodation mechanism. These results suggest that accommodative responses influence human subjective judgments as well as being a human factor related closely to image quality and that the spatial features of quality‐degraded images underlie human subjective judgments. In other words, they imply that objective image‐quality evaluation metrics should satisfy the following two conditions: the incorporation of the accommodation characteristics into such metrics and the formulation of such metrics in the spatial region. 相似文献
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为解决传统数据采集速率控制系统存在的采集速率较低,采集精度较低等问题,提出高帧频二维数字图像数据采集速率控制系统设计。充分考虑数据采集速率控制需求,选用KPCI-811数据采集卡对系统硬件部分的数据采集电路和电源电路进行改进,优化软件部分的数据采集、数据过滤及数据采集效率控制功能,完成高帧频二维数字图像数据采集速率控制系统的设计。实验结果表明,较传统系统,该系统的采集耗时更少,采集速率更高,采集精度更高,满足数据采集速率控制需求。 相似文献
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许靖添 《计算机测量与控制》2021,29(2):67-70
目前研究的航天器目标跟踪控制系统控制有效率低,追踪图像与实际目标不同,准确率低;基于图像轮廓检测设计了一种新的航天器目标跟踪控制系统,根据系统硬件的不同性能与结构进行模块式划分,同时将图像轮廓检测数据准则添加入中心管理系统中,时刻保证数据的检测安全系数处于系统操作允许范围内;调整原有的软件结构状态,采集航天器轮廓图像并提取轮廓信息,选用适当的图像轮廓检测阈值,集中检验跟踪目标的运动方向,调控方向数据,以此降低图像的像素变化程度,得到准确的航天器目标跟踪控制结果;实验结果表明基于图像轮廓检测的航天器目标跟踪控制系统控制有效率达到了84%,跟踪目标更加准确。 相似文献
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This study was conducted by subjective and objective measurement, to clarify the complex relationships among human visual preference and fatigue of major Flat Panel Display TVs with related physical and physiological factors. In the subjective measurement, comparison tests with 24 subjects were conducted and the semantic differential method with factor analysis was carried out for six TVs with different room luminance and length of watching time. The comparison test yielded identification of the most preferable display, which showed little connection with the TV luminance for any length of watching time and room luminance. From the statistical factor analysis of semantic differential method, significant factors were extracted for describing human visual preference. In the objective measurement, the eye motion tracking camera was used to detect the eye response and thus generated physiological data corroborated the significant factors extracted from the subjective measurement. This study allows the human perceptual preference and fatigue of electronic displays to be quantitatively measured with psychological and physiological factors and will tell which parameters are significant and guide the manufacturer in making the optimum TVs. 相似文献
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Markus Grabner 《Computer Animation and Virtual Worlds》2001,12(5):241-252
This paper addresses the problem of interactive visualization of multi‐resolution triangle meshes. Visible switching between different levels of detail is avoided by smoothly interpolating mesh geometry between different levels. The interpolation parameter is derived from the screen‐space geometric error of the affected mesh region instead of assigning a fixed time to the transition. The shortcomings of straightforward frame rate control mechanisms (i.e., overshooting and oscillation) are avoided by a semi‐predictive algorithm. The average rendering time per triangle is measured and used to determine the desired number of faces. A set of experiments demonstrates the advantages of both methods. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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为了更好地评价众包软件开发者的能力,分析了众包模式下软件众包开发的三个基本要素,即大众开发者、任务发布者、众包平台,提出了一种软件众包开发者能力价值率模型.该模型将软件众包任务从子任务、时间阶段、质量特性三个维度进行细分,首先评价众包原子单元,进而综合评估整个众包软件的质量.模型在评价过程中充分考虑了开发者的价值贡献因... 相似文献
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5G时代的到来使得图像处理技术也得到了迅猛发展,自然图像质量评价方法成为图像处理领域的重要研究热点.在自然图像获取、图像压缩、存储等处理时,图像质量不可避免的产生各种类型的失真,从而自然图像质量评价方法的应用越来越广泛.首先阐述自然图像的失真类型和公开标准图像数据库的相关知识,然后分别从主观评价和客观评价两种方法分析自... 相似文献
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动态纹理是计算机视觉中的动态模型之一,在空间范围内具有统计平稳性,在时间维度上具有随机重复性.动态纹理合成的目标是生成与给定纹理在视觉上相似的图像.在进行动态纹理合成时,回归预测误差积累是导致纹理质量下降的一个关键问题.为此,本文提出一种基于自纠正机制的动态纹理合成模型.利用清晰度、结构相似性、光流等指标来确定优化数据... 相似文献
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用形状轮廓上点的坐标位置相对于形状重心位置的分布关系描述形状,提出一种极坐标下形状轮廓点分布直方图描述符(contour points distribution histogram),该描述符不仅符合人眼的视觉直观感受、计算简单,而且其本质上具有缩放和平移不变性。用动态规划算法(dynamic programming algorithm)来度量轮廓点分布直方图之间的距离,部分解决了轮廓点分布直方图对于旋转不变性的要求。在多个形状图像数据库中的实验结果表明,该方法在单目标封闭轮廓的形状图像检索中取得了良好效果。 相似文献
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Hans Roehrig Jerry Gaskill Jiahua Fan Chadwick Martin John Greivenkamp Ehsan Samei 《Journal of the Society for Information Display》2006,14(10):847-860
Abstract— This paper describes a charged‐coupled device (CCD) camera, which was developed for in‐field evaluation of the image quality of electronic‐display devices [such as cathode‐ray tubes (CRTs) and liquid‐crystal displays (LCDs)] used for medical applications. Contrary to traditional cameras for display‐image‐quality evaluation, this CCD camera does not require a sophisticated x‐y‐z translation stage for mounting and adjustment. Instead, it is handheld and pressed by gentle pressure against the display screen. It is controlled by a software package which was originally developed for display calibration according to the DICOM 14 gray‐scale standard display function (GSDF). This software package controls the camera gain when measurements are made at different display luminance, display test patterns, performs image analysis and displays the results of the measurements and calculations. The work concentrated on the measurement of modulation transfer function (MTF) and of signal‐to‐noise ratio (SNR) per display pixel. The MTF is derived from the Fourier transform of the line spread function (LSF). The single‐display‐pixel SNR is derived from the integration of the noise power spectrum (NPS) of a camera image taken of a display with a uniform luminance. It is demonstrated that the device can produce repeatable results in terms of MTF and SNR. MTFs were measured on three monochrome CRTs and five monochrome LCDs in order to study repeatability and similar quantities. The MTF was measured on a 5‐Mpixel LCD yielding values that lie within 3.5% of the average MTF at the Nyquist frequency and 4.0% of the maximum total sharpness (∫ MTF2 df). The MTF was also measured on a 9‐Mpixel LCD, yielding values that lie within 9.0% of the average MTF at the Nyquist frequency and 8.0% of the maximum total sharpness. The SNR was measured eight times on a 3‐Mpixel monochrome LCD at nine digital driving levels (DDLs). At a DDL of 185, the mean SNR was 15.694 and the standard deviation (Stdv) was 0.587. At a DDL of 65, the mean SNR was 5.675 and Stdv was 0.120. 相似文献
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JPEG-LS图像压缩动态码率控制策略 总被引：1，自引：0，他引：1
对JPEG-LS图像压缩方案的编码特性进行数据分析,提出一阶码率控制策略与二阶码率控制策略,有效地实现了近无损图像编码过程中的码率动态调整。实验证明,该码率控制解决方案运算量小、收敛性好,能够有效抑制码率的大幅波动,在目标码率下可以稳定输出压缩码流,保证了编码图像的质量。 相似文献