Papers by Shang-Chih Chuang
2019 IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)
This paper reviewed the 3rd NTIRE challenge on singleimage super-resolution (restoration of rich ... more This paper reviewed the 3rd NTIRE challenge on singleimage super-resolution (restoration of rich details in a lowresolution image) with a focus on proposed solutions and results. The challenge had 1 track, which was aimed at the real-world single image super-resolution problem with an unknown scaling factor. Participants were mapping low-resolution images captured by a DSLR camera with a shorter focal length to their high-resolution images captured at a longer focal length. With this challenge, we introduced a novel real-world super-resolution dataset (Re-alSR). The track had 403 registered participants, and 36 teams competed in the final testing phase. They gauge the state-of-the-art in real-world single image super-resolution.
Proceeding of the 8th workshop on Multimedia and security - MM&Sec '06, 2006
A novel information-hiding methodology denoted as digital invisible ink is introduced. The propos... more A novel information-hiding methodology denoted as digital invisible ink is introduced. The proposed approach is inspired by the invisible ink in the real world and can be regarded as an extension of the informed-embedding methodology. Messages hidden in digital contents using digital invisible ink cannot be correctly or clearly revealed unless certain pre-negotiated manipulations have been applied to the marked work. To facilitate such behavior, models and implementations based on both spreadspectrum and quantization-based watermarking approaches are investigated. Finally, benefits and limitations for applying digital invisible ink in common steganography systems and secret communications enabling plausible deniability are discussed.
Seamless Viewpoint Switching for Multiview Video
2007 Digest of Technical Papers International Conference on Consumer Electronics, 2007
This paper presents a smooth viewpoint change scheme for multiview video using view interpolation... more This paper presents a smooth viewpoint change scheme for multiview video using view interpolation based on image warping techniques. The proposed method produces high-quality scenes for continuously changing viewpoints and needs only cost-effective coding overheads. The proposed scheme facilitates seamless viewpoint-aware video playback and provides a new experience for video entertainments, like sports or performance.
2006 IEEE International Conference on Multimedia and Expo, 2006
By grouping the common prefix of a Huffman tree, in stead of the commonly used single-side rowing... more By grouping the common prefix of a Huffman tree, in stead of the commonly used single-side rowing Huffman tree (SGHtree), we construct a memory efficient Huffman table on the basis of an arbitrary-side growing Huffman tree (AGH-tree) to speed up the Hufman decoding. Simulation results show that, in Huffman decoding, an AGH-tree based Huffman table is 2.35 times faster that of the Hashemian's method (an SGHtree based one) and needs only one-fifth the corresponding memory size. In summary, a novel Huffman table construction scheme is proposed in this paper which provides better performance than existing construction schemes in both decoding speed and memory usage.
2007 IEEE International Conference on Image Processing, 2007
A novel data-hiding methodology, denoted as unseen visible watermarking (UVW), is proposed. The p... more A novel data-hiding methodology, denoted as unseen visible watermarking (UVW), is proposed. The proposed scheme is inspired by real-world watermarks and possesses advantages of both visible and invisible watermarking schemes. After watermark embedding, the differences between the original work and the stego work are imperceptible under normal viewing conditions. However, when the hidden message is to be extracted, no explicit watermark extracting module is required. Semanticallymeaningful watermark patterns can be directly recognized from the stego work as long as common imaging-related functions, e.g. gamma-correction or even simply changing the user-viewing angle relative to the LCD monitor, are performed. The proposed scheme outperforms existing invisible watermarking methods in its capability to practically convey metadata to users of legacy display devices lacking renewal capability. On the other hand, it does not suffer from the annoying quality-degradation problem of visible watermarking schemes. Limitations and possible extensions of the proposed schemes are also addressed. We believe that many interesting new applications can be facilitated using such unseen visible watermarking schemes.
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Papers by Shang-Chih Chuang