Báo cáo hóa học: " Research Article Video Transcoder in DCT-Domain Spatial Resolution Reduction Using Low-Complexity Motion Vector " pdf

... macroblock in DCT-domain. (2) It is difficult to refine motion vector in DCT-domain. Therefore, transcoding in DCT-domain needs more accurate motion vector than pixel domain. (3) However, nonrefined motion ... finally, our concluding remarks are given in Section 5. 2. FUNDAMENTALS IN DCT-DOMAIN VIDEO TRANSCODING 2.1. DCT-domain down-conversion In pixel-domain tra...

Ngày tải lên: 22/06/2014, 01:20

... 1996. [39] M. Kaur, M. Singh, A. Girdhar, and P. S. Sandhu, “Fingerprint verification system using minutiae extraction technique,” in Proceedings of World Academy of Science, Engineering and Technology, ... missing (maybe parts that do not contain any crucial information, for example, termina- tions/bifurcations in case of fingerprints). Restoration aims at reproducing lost regions, usual...

Ngày tải lên: 21/06/2014, 05:20

... containing moving objects (nonstationary regions). Video sequences usually contain noise, causing coefficients to vary, even in the absence of moving objects. In order to reduce the noise in uence, ... obtained for K = 1200. In the time-frequency analysis, the window width in u- ences the resolution in the time-frequency domain. A narrow window produces good time resolution whil...

Ngày tải lên: 21/06/2014, 08:20

... filled in the Obfuscation Unit using video in- painting as proposed in [14]. The privacy object information is sent to the Secure Data Hiding unit to be encrypted and embedded inside the modified video. ... concealment, video data hiding has found usage in a great number of applications. In this work, we introduce the detailed framework of using data hiding for privacy informa...

Ngày tải lên: 22/06/2014, 00:20

... a broad variety of videos. Until now, video enhancement still remains a challenging research problem in filtering noises as well as enhancing contrast. The natural noises in videos are quite complex; ... mentioned in Section 2, in order to better deal with details as well as avoiding ringing artifacts, we first separate an image into large scale parts and details using ROAD bilate...

Ngày tải lên: 22/06/2014, 01:20

... born in Trieste, Italy, in 1963. He received the Dr. Eng. degree in electronic engineering (summa cum laude) in 1990 and the Ph.D. degree in 1994. Since 1995, he has held the position of Researcher in ... illumination is decimated before temporal filtering. We observed indeed that full resolution is not needed, since the background illumina- tion contains only the lowest frequenc...

Ngày tải lên: 22/06/2014, 19:20

... years, feature-based techniques in the wavelet domain have gained more attention in object tracking [20– 23]. In [20], an object in the current frame is modeled by using the highest energy coefficients ... cited. 1. INTRODUCTION Object tracking is one of the challenging problems in im- age and video processing applications. With the emergence of interactive multimedia systems, tra...

Ngày tải lên: 22/06/2014, 19:20

... Gros, and F. Spindler, “A geometr i- cal key-frame selection method exploiting dominant motion estimation in video, ” in Proceedings of the 3rd International Conference on Image and Video Retrieval ... same type of motion. In [3], shots are segmented according to camera motions. Then, MPEG motion vectors, that contain the camera and object motions, are used to define the motion...

Ngày tải lên: 22/06/2014, 19:20

... representing the underlying video as basic im- age patterns (varying in spatial or ientation and frequency) moving in different ways. Such a representation is naturally more efficient than using a separable ... containing 1 low subband and 7 high subbands. Because ψ a is a linear combination of these four separable bases, the wavelet coefficients corresponding to ψ a can be obtained by l...

Ngày tải lên: 22/06/2014, 22:20

... Communications and Networking 3 Raw packet capture Data and parameter setting for training Data setting for testing Machine training Selected fields from GA process Machine testing True/ false Feedback ... maximizing the margin and minimizing the training error. If C is too small, insufficient stress is placed on fitting the training data. If C is too large, the algorithm will overfit the dataset....

Ngày tải lên: 21/06/2014, 05:20