153 research outputs found
影像細縫裁減法
[[sponsorship]]中華民國人工智慧學會[[conferencedate]]20121116~20121118[[iscallforpapers]]Y[[conferencelocation]]Tainan, Taiwa
影像細縫裁減法
[[abstract]]隨著科技的發展顯示器的使用越來越普遍,配合不同大小螢幕的影像縮放技術越來越受重視,傳統的剪裁和非等比例縮放容易造成影像的變形或失真。Avidan and Shamir 提出了一個影像細縫裁減,其依據影像內容來對影像重新調整大小的方法,被認為是一個有效的解決方法,使用簡單的濾波器來找出影像中高能量的區域並保留下來,但是很多時候這種演算法並不能產生令人滿意地結果,它無法應付各種類型的影像,例如有複雜背景或是高反差顏色的影像。本篇論文希望能夠對細縫裁減演算法作改進,透過改變能量圖的計算方式,來降低複雜背景的高頻雜訊,使得在各種複雜背景的影像都能夠達到使用者期望的結果。[[sponsorship]]中華民國人工智慧學會[[conferencetype]]國際[[conferencedate]]20121116~20121118[[iscallforpapers]]Y[[conferencelocation]]臺南, 臺
Deformation analysis and its application in image editing.
Jiang, Lei.Thesis (M.Phil.)--Chinese University of Hong Kong, 2011.Includes bibliographical references (p. 68-75).Abstracts in English and Chinese.Chapter 1 --- Introduction --- p.1Chapter 2 --- Background and Motivation --- p.5Chapter 2.1 --- Foreshortening --- p.5Chapter 2.1.1 --- Vanishing Point --- p.6Chapter 2.1.2 --- Metric Rectification --- p.8Chapter 2.2 --- Content Aware Image Resizing --- p.11Chapter 2.3 --- Texture Deformation --- p.15Chapter 2.3.1 --- Shape from texture --- p.16Chapter 2.3.2 --- Shape from lattice --- p.18Chapter 3 --- Resizing on Facade --- p.21Chapter 3.1 --- Introduction --- p.21Chapter 3.2 --- Related Work --- p.23Chapter 3.3 --- Algorithm --- p.24Chapter 3.3.1 --- Facade Detection --- p.25Chapter 3.3.2 --- Facade Resizing --- p.32Chapter 3.4 --- Results --- p.34Chapter 4 --- Cell Texture Editing --- p.42Chapter 4.1 --- Introduction --- p.42Chapter 4.2 --- Related Work --- p.44Chapter 4.3 --- Our Approach --- p.46Chapter 4.3.1 --- Cell Detection --- p.47Chapter 4.3.2 --- Local Affine Estimation --- p.49Chapter 4.3.3 --- Affine Transformation Field --- p.52Chapter 4.4 --- Photo Editing Applications --- p.55Chapter 4.5 --- Discussion --- p.58Chapter 5 --- Conclusion --- p.65Bibliography --- p.6
Pseudo-Dolly-In Video Generation Combining 3D Modeling and Image Reconstruction
This paper proposes a pseudo-dolly-in video generation method that reproduces motion parallax by applying image reconstruction processing to multi-view videos. Since dolly-in video is taken by moving a camera forward to reproduce motion parallax, we can present a sense of immersion. However, at a sporting event in a large-scale space, moving a camera is difficult. Our research generates dolly-in video from multi-view images captured by fixed cameras. By applying the Image-Based Modeling technique, dolly-in video can be generated. Unfortunately, the video quality is often damaged by the 3D estimation error. On the other hand, Bullet-Time realizes high-quality video observation. However, moving the virtual-viewpoint from the capturing positions is difficult. To solve these problems, we propose a method to generate a pseudo-dolly-in image by installing 3D estimation and image reconstruction techniques into Bullet-Time and show its effectiveness by applying it to multi-view videos captured at an actual soccer stadium. In the experiment, we compared the proposed method with digital zoom images and with the dolly-in video generated from the Image-Based Modeling and Rendering method.Published in: 2017 IEEE International Symposium on Mixed and Augmented Reality (ISMAR-Adjunct) Date of Conference: 9-13 Oct. 2017 Conference Location: Nantes, Franc
Hybrid LSTM and Encoder-Decoder Architecture for Detection of Image Forgeries
With advanced image journaling tools, one can easily alter the semantic
meaning of an image by exploiting certain manipulation techniques such as
copy-clone, object splicing, and removal, which mislead the viewers. In
contrast, the identification of these manipulations becomes a very challenging
task as manipulated regions are not visually apparent. This paper proposes a
high-confidence manipulation localization architecture which utilizes
resampling features, Long-Short Term Memory (LSTM) cells, and encoder-decoder
network to segment out manipulated regions from non-manipulated ones.
Resampling features are used to capture artifacts like JPEG quality loss,
upsampling, downsampling, rotation, and shearing. The proposed network exploits
larger receptive fields (spatial maps) and frequency domain correlation to
analyze the discriminative characteristics between manipulated and
non-manipulated regions by incorporating encoder and LSTM network. Finally,
decoder network learns the mapping from low-resolution feature maps to
pixel-wise predictions for image tamper localization. With predicted mask
provided by final layer (softmax) of the proposed architecture, end-to-end
training is performed to learn the network parameters through back-propagation
using ground-truth masks. Furthermore, a large image splicing dataset is
introduced to guide the training process. The proposed method is capable of
localizing image manipulations at pixel level with high precision, which is
demonstrated through rigorous experimentation on three diverse datasets
On Layered Area-Proportional Rectangle Contact Representations
A pair of graphs admits a mutual witness proximity
drawing when: (i) represents
, and (ii) there is an edge in if and only if there is
no vertex in that is ``too close'' to both and
(). In this paper, we consider infinitely many definitions of closeness
by adopting the -proximity rule for any and study
pairs of isomorphic trees that admit a mutual witness -proximity
drawing. Specifically, we show that every two isomorphic trees admit a mutual
witness -proximity drawing for any . The
constructive technique can be made ``robust'': For some tree pairs we can
suitably prune linearly many leaves from one of the two trees and still retain
their mutual witness -proximity drawability. Notably, in the special
case of isomorphic caterpillars and , we construct linearly separable
mutual witness Gabriel drawings.Comment: Appears in the Proceedings of the 18th International Conference and
Workshops on Algorithms and Computation (WALCOM 2024
Texture and Colour in Image Analysis
Research in colour and texture has experienced major changes in the last few years. This book presents some recent advances in the field, specifically in the theory and applications of colour texture analysis. This volume also features benchmarks, comparative evaluations and reviews
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