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首页> 外文期刊>Journal of Imaging Science and Technology >Banding Artifact Reduction with Interweaving Dot Dispersion Based on Probability Model and Human Visual System Weighted Root Mean Squared Error in Blue Noise Multilevel Dithering
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Banding Artifact Reduction with Interweaving Dot Dispersion Based on Probability Model and Human Visual System Weighted Root Mean Squared Error in Blue Noise Multilevel Dithering

机译：基于概率模型和人眼视觉系统加权均方根误差的蓝噪声多级抖动的带点交织的带状伪影减少

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Digital printing has focused on multilevel dithering using a stochastic screen as this procedure is simple to implement and yields a smooth output pattern. In bilevel halftoning with a stochastic screen, two printable output levels, i.e., black and white, corresponding to the input image, values are determined by the threshold values of the stochastic screen. For multilevel halftoning, these threshold values are then simply extended using a scaling function. Yet, a simple extension using a scaling function also generates banding artifacts around the intermediate printable tone levels, producing discontinuity in a smooth tone transition region. Therefore, to reduce these banding artifacts, this article proposes blue-noise multilevel dithering with interweaving dot dispersion. First, to investigate the cause and characteristics of the banding artifacts, multilevel halftoning using a simple scaling function is analyzed using a probability model when varying the number of tone levels, thereby generalizing the characteristics of the banding artifacts. The scaling function for the multilevel halftoning is then modified using two control factors based on the generalized characteristics of the banding artifacts according to the number of printable tone levels in order to interweave dot dispersion in the banding regions. The dot distribution across the banding regions is affected by the two control factors that control the interweaving point. The specific values for the control factors are determined by investigating via subjective observation and the human visual system weighted root mean squared error (HVS-WRMSE) curve using the perceived root mean square and based on characteristics of the human visual system. In experiments, an objective evaluation using the HVS-WRMSE of a multitoned image is used to compare the quality of the multitoned patterns around the intermediate tone levels. The proposed method is found to moderately reduce the banding artifacts in the gray ramp when compared to the conventional methods.
机译：由于此过程易于实现且可产生平滑的输出图案，因此数字印刷的重点是使用随机屏幕进行多级抖动。在具有随机屏幕的双级半色调中，对应于输入图像的两个可打印的输出级别，即黑白，由随机屏幕的阈值确定。对于多级半色调，然后使用缩放功能简单地扩展这些阈值。但是，使用缩放功能的简单扩展也会在中间可打印色调级别周围生成条带伪像，从而在平滑的色调过渡区域中产生不连续性。因此，为了减少这些条带伪影，本文提出了一种蓝点多级抖动与交织点分散的方法。首先，为了研究带状伪像的原因和特征，当改变音调电平的数量时，使用概率模型分析使用简单缩放函数的多级半色调，从而概括带状伪像的特征。然后，根据条带伪影的一般特性，根据可打印的色调级别数，使用两个控制因子修改用于多级半色调的缩放函数，以便在条带区域中交织点分散。跨越条带区域的点分布受控制交织点的两个控制因素的影响。控制因素的具体值是通过主观观察和人眼视觉系统加权均方根误差（HVS-WRMSE）曲线，使用感知到的均方根并基于人眼视觉系统的特性确定的。在实验中，使用对多色调图像的HVS-WRMSE进行的客观评估用于比较中间色调水平附近多色调图案的质量。与常规方法相比，发现所提出的方法可适度减少灰色坡道中的条带伪影。

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  • 来源
    《Journal of Imaging Science and Technology》 |2009年第6期|060504.1-060504.8060504.11-060504.13|共11页
  • 作者

    Tae-Yong Park; In-Su Jang; Yeong-Ho Ha;

  • 作者单位

    School of Electrical Engineering and Computer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea;

    School of Electrical Engineering and Computer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea;

    School of Electrical Engineering and Computer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea;

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