Publications

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2016

(Accepted)

 

This paper presents a new and efficient automatic method for structure-preserving stippling. The core idea is to concentrate on structure preservation by using a priority-based scheme that treats extremal pixels first and preferentially assigns positive error to lighter pixels and negative error to darker pixels, emphasizing contrast. The use of a nonlinear spatial function to shrink or...

2015
  • Hua Li, David Mould: Contrast-Enhanced Black and White ImagesComput. Graph. Forum 34(7): 319-328 (2015) (Pacific Graphics) (pdf), (ppt), (link)

This paper investigates contrast enhancement as an approach to tone reduction, aiming to convert a photograph to black and white. Using a...

2014

Continuous line drawing (CLD) is a drawing style where a picture consists of a single closed non-intersecting line. We present an automatic algorithm for constructing CLDs, with tone and structural information obtained from input images. The connectivity of the line is maintained through a tree generated by path finding with consideration of the key features for a given image. A branching tree...

Hua Li  (Best Thesis Awardpresented at Graphics Interface 2014moreyes
 

Non-photorealistic rendering (NPR) algorithms are used to produce stylized images, e.g., in a painted or stippled style. This thesis presents a new family of automatic methods for effects and styles including...

Hua Li
 

Sketch and Stylize 3D Models
Carolina Women in Computing

Hua Li

2013

Non-photorealistic rendering (NPR) has been used to produce stylized images, e.g., in a stippled or painted style. To evaluate NPR algorithms, similarity measurements used in image processing have been employed to assess the quality of rendered images. However, there is no standard objective measurement of stylization quality. In many cases, raw side-by-side comparisons are used to demonstrate improvements in aesthetic quality. This means of comparison often fails to be...

2012

Non-photorealistic rendering (NPR) algorithms are used to produce stylized images, and have generally been evaluated on the aesthetic qualities of the resulting images. NPR-produced images have been used for aesthetic and practical reasons in media intended to produce an emotional reaction in a consumer (e.g., computer games, films, advertisements, and web...

(Award: Best Paper ARTECH 2012 -- Honorable Mention) yes

Continuous line drawing (CLD) is a drawing style where a picture consists of a single long closed line without self intersection. We present an algorithm for constructing CLDs from input images. We maintain the connectivity of the line through a tree generated by...

2011

Traditional methods produced unsatisfactory uniform screening. Often additional tones are added to improve the quality of tone and structure. In this paper, we try to produce screening with diverse patterns and with natural structure preservation while still using only one color of ink. We propose several extensions to contrast-aware halftoning including new weight distributions and variations on the priority-based scheme. Patterns can...

(Award: Best Student Paper (Graphics)) yes
This paper presents a new fast, automatic method for structure-aware stippling. The core idea is to concentrate on structure preservation by using a priority-based scheme that treats extreme stipples first and preferentially assign positive error to lighter stipples and negative error to darker...

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