Content-Sensitive Screening in Black and White

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Presentation transcript:

Content-Sensitive Screening in Black and White Hua Li and David Mould Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Outline Introduction Previous Work Our Method Discussion and Future Work Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Introduction Screening A process for printing by passing ink through a perforated screen (or pattern) over a region. Screen2 Screen1 Pattern2 Pattern1 Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Previous Methods Original Image Our Type I (Main Direction) Dithering Method (Ulichney, 1987) Manga Screening (grayscale) (Qu et al., 2008) Our Type I (Edge-exclusion) Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Motivated by Contrast-Aware Halftoning An variant of error diffusion algorithm The contrast-aware weight distribution The priority-based scheme Original Image Our Contrast-Aware Halftoning [Li and Mould 2010] Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Overview of Our Method Pattern Assignment OR Pattern Generation Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

PartI: Pattern Assignment Green: medium degree of content White: background trivial area Mean-shift segmentation [Comaniciu and Meer, 2002] Gradient map Yellow: uniform regions Blue: highly textured Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Our Method—Pattern Generation (I) Type I: Exclusion-based Masks Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Our Method—Pattern Generation (I) Type I: Tone changes Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Our Method—Pattern Generation (I) Random assignment without content consideration Edge-exclusion Type I: Main direction Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Dithering Manga Screening Our Type I 2018/11/9

Our Method—Pattern Generation (II) (a)Pixels on pattern edges from input images (b)Pixels on ETF feature edges ( c) The rest pixels A multi-stage process Stage I: Stage II: Stage III: Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Our Type II Dithering Method Manga Screening Our Type I Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

More Comparisons: Manga Screening Our Type II Our Type II Our Type I Dithering Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Discussion Both structure-preserving screening with natural looking. An automatic method. Powerful extensions from the multi-stage process. Performance: faster than manga screening. Open to color extensions. Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Future Work Refine the content-sensitive assignment and improve the multi-stage process; Introduce high-quality patterns into our method; Extend to color screening. Presented by Hua Li hli1@connect.carleton.ca 2018/11/9

Acknowledgement Thanks to: permission to use their original images and their results from Yingge Qu; grants from NSERC and Carleton University. Presented by Hua Li hli1@connect.carleton.ca 2018/11/9