扫描健壮的艺术QR码生成

发布时间：2018-07-29 16:37

【摘要】：随着智能手机的普及,二维码的应用变得无所不在,而QR码(Quick Response Code)作为应用最广泛的二维码之一,更是受到许多研究人员的关注。目前,QR码主要被应用于连接线上与线下生活,其有着信息容量大、成本低、易于制作等优点,但与此同时,其仅由黑白块构成的外观,由于缺乏美感,很难满足用户个性化需求。近年来,为解决这一问题,QR码美化技术得到不断发展。研究人员通过改变QR码颜色、修改QR码模块形状等方式,尝试获得更加有趣的QR码样式。但是,一方面,QR码经常需要在不同的环境中被扫描,它们必须适应不同的光照、缩放、遮挡、以及扫码角度变换等;而另一方面,在QR码外观上细微的改变都可能会使其原有信息遭到破坏,导致扫描失败。所以,如何使QR码同时兼顾视觉效果和扫描健壮性成为一个重要的研究课题。本文提出一种新的扫描健壮的艺术QR码生成方法,其主要研究内容包括:1)分析一般QR码扫描器的扫码原理,研究QR码扫描过程中误差产生的原因及步骤,通过建立一个扫描误差分析模型,量化QR码模块阈值化误差与采样误差对艺术QR码扫描健壮性的影响。2)建立一种新的艺术QR码生成方法,提出了一种基于局部亮度调整的优化策略,平衡QR码视觉效果与扫描健壮性间的关系。该种QR码生成算法十分灵活,可以通过调整初始化参数,获得不同风格的艺术QR码。3)设计一种基于线性插值算法的亮度调整方法,能够应用于艺术QR码生成过程中,将灰度化艺术QR码转换为彩色艺术QR码。本文所提出的一种扫描健壮的艺术QR码生成方法,是一个分层次的、由粗到精的艺术QR码生成过程,其依次生成二值化艺术QR码、灰度化艺术QR码、和彩色艺术QR码。在生成流程中,保留QR码的误差纠错能力的同时,不断丰富QR码外观视觉效果。通过与目前最先进的艺术QR码生成算法对比,用户调查和解码实验表明,我们所提取的算法在视觉效果和扫描健壮性方面,均能取得卓越性能。
[Abstract]:With the popularity of smart phones, the application of QR codes has become ubiquitous. As one of the most widely used QR codes, QR code (Quick Response Code) has been paid more attention by many researchers. At present, QR code is mainly used in the connection line and offline life. It has the advantages of large information capacity, low cost and easy to be made, but at the same time, it is only made up of black and white blocks, because of the lack of aesthetic sense. It is difficult to meet the individual needs of users. In recent years, in order to solve this problem, QR code beautification technology has been continuously developed. By changing the color of QR code and modifying the shape of QR code module, the researchers try to obtain more interesting QR code style. However, on the one hand, QR codes often need to be scanned in different environments, which must be adapted to different illumination, scaling, shading, and scan angle transformation; on the other hand, Minor changes in the appearance of QR codes may destroy their original information and cause scanning failures. Therefore, how to make QR code both visual effect and scanning robustness becomes an important research topic. In this paper, a new scanning robust artistic QR code generation method is proposed. The main research contents include: 1) analyzing the scanning principle of the general QR code scanner, and studying the causes and steps of the errors in the QR code scanning process. By establishing a scanning error analysis model and quantifying the influence of threshold error and sampling error of QR code module on the scanning robustness of art QR code, a new artistic QR code generation method is established. An optimization strategy based on local luminance adjustment is proposed to balance the relationship between the visual effect of QR code and scan robustness. This QR code generation algorithm is very flexible and can be used in the process of artistic QR code generation by adjusting the initialization parameters and obtaining different styles of art QR code. (3) A brightness adjustment method based on linear interpolation algorithm is designed and applied to the process of artistic QR code generation. The grayscale art QR code is converted to color art QR code. The method proposed in this paper is a hierarchical, coarse-to-fine art QR code generation process, which generates binary art QR code, grayscale art QR code, and color art QR code in turn. In the process of generating QR codes, the error correction ability of QR codes is preserved and the visual effects of QR codes are enriched. Compared with the most advanced art QR code generation algorithm, user investigation and decoding experiments show that the proposed algorithm can achieve excellent performance in visual effect and scanning robustness.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.44

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