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Proceedings of the Seventh Indian Conference on Computer vision, Graphics and image processing

作者： Ram, Ranjith Shetty, Anup Chaudhuri, Subhasis Vision and Image Processing Lab. Department of Electrical Engineering Indian Institute of Technology Bombay Powai India

ISBN: (纸本)9781450300605

Temporal segmentation of a video into its constituent shots is the basic step towards the exploration about the organization of digital video for all higher level analysis. Video shot detection methods in the literature mostly involve heuristics and fail to perform satisfactorily under varied shot detection scenarios. Though model based shot recognition methods are popular, they are inadequate when a given test video sequence contains transitions. Not much work has been reported which deal with the changes in activities in areas where we have to recognize the activities over a long video sequence. We formulate this as a novel N-class, model based shot detection problem and present a stochastic, asymptotically optimal procedure as a solution to such a scenario, so that neither changes in content nor the types of shot transition hinder the decision making process. A hidden Markov model (HMM), trained using a few relevant features from the different classes of frame sequences is employed to achieve this goal. We present extensive experimental results to demonstrate the effectiveness of our method. © 2010 ACM.

关键词： Hidden Markov models

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Computation of embedding capacity in reversible watermarking schemes 10

Computation of embedding capacity in reversible watermarking...

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Proceedings of the Seventh Indian Conference on Computer vision, Graphics and image processing

作者： Borse, Rushikesh Chaudhuri, Subhasis Vision and Image Processing Lab. Department of Electrical Engineering Indian Institute of Technology Bombay Powai India

ISBN: (纸本)9781450300605

This paper deals about embedding capacity computation for reversible watermarking schemes. The paper proposes a unique way of computing embedding capacity directly from the data set without actually embedding the watermark in the image. This computation is done based on the statistical parameters of the data set. We also demonstrate how to compute the capacity under distortion constraints. We also show how to enhance the capacity by using a multipass embedding scheme without substantially affecting the PSNR. © 2010 ACM.

关键词： Digital watermarking

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Depth estimation and inpainting with an unconstrained camera

Depth estimation and inpainting with an unconstrained camera

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2010 21st British Machine vision Conference, BMVC 2010

作者： Bhavsar, Arnav V. Rajagopalan, A.N. Image Processing and Computer Vision Lab. Department of Electrical Engineering Indian Institute of Technology Madras Chennai India

ISBN: (纸本)1901725405

Unrestricted camera motion and the ability to operate over a range of lens parameters are often desirable when using an off-the-shelf camera. Variations in intrinsic and extrinsic parameters induce defocus and pixel motion, both of which relate to scene structure. We propose a depth estimation approach by elegantly coupling the motion and defocus cues. We further advocate a natural extension of our framework for inpainting both depth and image, using the motion cue. Unlike traditional inpainting, our approach also considers defocus blur. This ensures that the image inpainting is coherent with respect to defocus. We use the belief propagation method in our estimation approach, which also handles occlusions and uses the color image segmentation cue. © 2010. The copyright of this document resides with its authors.

关键词： Cameras

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Inferring image transformation and structure from motion-blurred images

Inferring image transformation and structure from motion-blu...

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2010 21st British Machine vision Conference, BMVC 2010

作者： Chandramouli, Paramanand Rajagopalan, A.N. Image Processing and Computer Vision Lab. Department of Electrical Engineering Indian Institute of Technology Madras Chennai India

ISBN: (纸本)1901725405

This paper deals with the problem of estimating structure of 3D scenes and image transformations from observations that are blurred due to unconstrained camera motion. Initially, we consider a fronto-parallel planar scene and relate the reference image of the scene to its motion-blurred observation by finding the reference image transformations. The blur kernel at every image point can be determined from these transformations. For 3D scenes, the extent of blurring in the image is related to the camera motion as well as the scene structure. We propose a technique to estimate the scene depth with the knowledge of the estimated image transformations. The proposed method is validated by testing on real and synthetic experiments. © 2010. The copyright of this document resides with its authors.

关键词： Cameras

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Character-based car plate detection and localization

Character-based car plate detection and localization

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International Conference on Information Science, Signal processing and Their Applications

作者： Setumin, S. Sheikh, U.U. Abu-Bakar, S.A.R. Computer Vision Video and Image Processing Research Lab. Department of Microelectronics and Computer Universiti Teknologi Malaysia Malaysia

ISBN: (纸本)9781424471676

In this paper we address the issue of locating non-standard Malaysian car license plate. Instead of searching the region for the plate, we directly locate the alphanumeric characters of the car plate. In this manner, we remove issues such as plate size variations and plates on black colored vehicles. Our main goal is to locate and extract the alphanumeric characters of Malaysian special plates. These special plates do not follow the normal standard car plates' format as they may contain italic, cursive and connected letters, and of different fonts. Using several parameters such as pixel compactness, angles, and projection histogram, we use ruledbased technique to locate and detect these special characters of the car plates. The results have shown that we are able to automatically locate with an accuracy of95%. © 2010 IEEE.

关键词： License plates (automobile)

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Colour adjustment and specular removal for non-uniform shape from shading

Colour adjustment and specular removal for non-uniform shape...

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International Conference on Digital image Computing: Techniques and Applications, DICTA 2010

作者： Zhang, Xiaozheng Gao, Yongsheng Caelli, Terry Biosecurity Group Queensland Research Lab. National ICT Australia Computer Vision and Image Processing Lab. Griffith University Australia

ISBN: (纸本)9780769542713

Surface colour changes and specular reflections are two major problems in 3D modelling using shape-from-shading (SFS). This paper proposes to pre-process the input image for a typical SFS algorithm, so that the resultant image has no colour changes and specular reflection. First, a chromaticity-based specular reflection removal algorithm is applied to achieve a pure diffuse (Lambertian) reflected image. Then, a novel chromaticity-based colour adjustment approach is proposed to generate an image without surface colour changes. The standard SFS algorithms can then be applied successfully onto the processed images to produce plausible 3D models. In experiments, the proposed approach was tested on standard SFS datasets with complex surface colours. The experimental results show it's promising to facilitate SFS algorithms to handle SFS problems with more complex surface properties and illumination conditions. © 2010 IEEE.

关键词： Color

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Gender estimation based on physiological features of the face

Gender estimation based on physiological features of the fac...

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International Conference on Information Science, Signal processing and Their Applications

作者： Ting, C.H. Sheikh, U.U. Abu-Bakar, S.A.R. Computer Vision Video and Image Processing Research Lab. Department of Microelectronics and Computer Engineering Universiti Teknologi Malaysia Malaysia

ISBN: (纸本)9781424471676

In this paper, we present a gender estimation technique that will determine whether a person looking at the camera is a male or female. Several facial features extracted from a face are passed to post-image-processing operations before they are sent to a rule-base classifier. We applied our technique to both static passport-like photos as well as several video sequences consisting of a single face each. Our database also contains images of females wearing headscarf as well as bald men. Our initial results showed a very promising outcome. For static face images, we obtained an accuracy of 100% correct gender estimation for females and 98% for males while for video sequences, the accuracy obtained was 87.5% for females and 70% for males. © 2010 IEEE.

关键词： Video recording

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Interest point based tracking

Interest point based tracking

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2010 20th International Conference on Pattern Recognition, ICPR 2010

作者： Kloihofer, Werner Kampel, Martin Research and Development Image Processing Center Communication Systems GmbH Vienna Austria Computer Vision Lab. Vienna University of Technology Vienna Austria

ISBN: (纸本)9780769541099

This paper deals with a novel method for object tracking. In the first step interest points are detected and feature descriptors around them are calculated. Sets of known points are created, allowing tracking based on point matching. The set representation is updated online at every tracking step. Our method uses one-shot learning with the first frame, so no offline and no supervised learning is required. Following an object recognition based approach there is no need for a background model or motion model, allowing tracking of abrupt motion and with non-stationary cameras. We compare our method to MeanShift and Tracking via Online Boosting, showing the benefits of our approach. © 2010 IEEE.

关键词： Object detection

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Simulation of realistic infrared texture of grassland

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Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument 2011年第12 SUPPL.期32卷 103-108页

作者： Liu, Qian Zhu, Feng Hao, Yingming Shenyang Institute of Automation Chinese Acad. of Sci. Shenyang 110016 China Graduate School of the Chinese Acad. of Sci. Beijing 110080 China Key Laboratory of Opto-Electronics Information Processing Chinese Acad. of Sci. Shenyang 110016 China Key Lab. of Image Understanding and Computer Vision Liaoning Shenyang 110016 China

A new method is introduced to simulate realistic infrared texture of grassland. First, the radiative temperature of grassland is solved by integrating material composition, environmental and meteorological factors. As the spectroscopic properties of grass and soil vary greatly, the infrared radiation characteristics are computed respectively. Next, the texture structure of grassland is modeled based on the analysis of spatial distribution of natural grassland. Finally, the infrared radiance of grass and soil are mapped to image space and a realistic grassland texture is generated. Experiment results show that similar visual features exhibit between simulated textures and actual grassland textures, which justifies the effectiveness of the proposed method.

关键词： Infrared radiation

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Random number generators: Metrics and tests for uniformity and randomness

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Journal of Combinatorial Mathematics and Combinatorial Computing 2010年 74卷 161-180页

作者： Yfantis, E.A. Pedersen, J.B. Image Processing Computer Vision and Machine Intelligence Lab College of Engineering 4505 Maryland Parkway Las Vegas NV 89154-4019 United States

Random number generators are a small part of any computer simulation project. Yet they are the heart and the engine that drives the project. Often times software houses fail to understand the complexity involved in building a random number generator that will satisfy the project requirements and will be able to produce realistic results. Building a random number generator with a desirable periodicity, that is uniform, that produces all the random permutations with equal probability, and at random, is not an easy task. In this paper we provide tests and metrics for testing random number generators for uniformity and randomness. These tests are in addition to the already existing tests for uniformity and randomness, which we modify by running each test a large number of times on sub-sequences of random numbers, each of length n. The test result obtained each time is used to determine the probability distribution function. This eliminates the random number generator misclassification error. We also provide new tests for uniformity and randomness, the new tests for uniformity test the skewness of each one of the subgroups as well as the kurtosis. The tests for randomness, which include the Fourier spectrum, the phase spectrum, the discrete cosine transform spectrum, and the orthogonal wavelet domain, test for patterns not detected in the row data space. Finally we provide visual and acoustic tests.

关键词： Discrete cosine transforms

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