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Proceedings ArticleDOI

Compression Of Stereo Images And The Evaluation Of Its Effects On 3-D Perception

30 Jan 1990-Vol. 1153, pp 522-530
TL;DR: The proposed approach to stereo image coding takes advantage of the singleness of vision property of the human visual system and shows that a stereo image pair, in which one of the images is low-pass filtered and subsampled, is perceived as a sharp 3-D image.
Abstract: The proposed approach to stereo image coding takes advantage of the singleness of vision property of the human visual system. Experiments show that a stereo image pair, in which one of the images is low-pass filtered and subsampled, is perceived as a sharp 3-D image. The depth information is perceived due to the stereopsis effect, and the sharpness is maintained due to the details in the non-filtered image. A methodology for the evaluation of the compression effects on the 3-D perception of stereo images is presented. It is based on measurements of response-time and accuracy of human subjects performing simple 3-D perception tasks.
Citations
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Proceedings ArticleDOI
26 Oct 1997
TL;DR: On line retraining of neural network is introduced for extracting foreground/background objects in video sequences and is compatible to MPEG-1/2 standard but also can be used as a pre-coding stage for the forthcoming MPEG-4 algorithm.
Abstract: On line retraining of neural network is introduced for extracting foreground/background objects in video sequences. The scheme is applied together with a modification of the rate control of MPEG-1 algorithm. The proposed method is compatible to MPEG-1/2 standard but also can be used as a pre-coding stage for the forthcoming MPEG-4 algorithm. Simulation studies have shown an improvement of about 1.5 dB on average as far the PSNR is concerned compared with the conventional MPEG-1 encoder.

5 citations


Cites methods from "Compression Of Stereo Images And Th..."

  • ...Several stereo image/video coding schemes have been introduced in the literature [12, 13, 14, 15, 16, 17, 18]....

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Book ChapterDOI
22 Aug 1997
TL;DR: A method is described for directional decomposition of an image into arbitrary directional edge planes, where the range of directions that is included in each directional edge plane may be determined individually.
Abstract: In previous work [1, 2], we presented algorithms for the analysis of maps and line-drawing images based on the processing of eight directional edge planes by regulated directional morphological operations. In this paper, a method is described for directional decomposition of an image into arbitrary directional edge planes, where the range of directions that is included in each directional edge plane may be determined individually. The proposed approach is based on the construction of a self dilated line kernel, which is generated by dilating a periodic straight line segment by itself. The self dilated line kernel is then used by the extended dilation operation for the extraction of line segments in a required direction.

5 citations

04 Dec 2007
TL;DR: This thesis investigates MDC of images, video, stereoscopic video, and 3D meshes thus validating MDC as an error resilience tool for various types of multimedia data.
Abstract: Nowadays, image and video compression are well developed fields of signal processing. Modern state-of-the-art coders allow better compression with better quality. A new field in signal processing is representation of 3D scenes. 3D visual scenes may be captured by stereoscopic or multi-view camera settings. The captured multi-view video can be compressed directly or converted to more abstract 3D data representations such as 3D dynamic meshes (mesh sequences) and efficiently compressed. In any case, efficiently compressed visual data has to be transmitted over communication channels, such as wireless channels or best-effort networks. This raises the problem of error protection, since most of these channels are error-prone. A common approach to error protection is to consider it as a pure channel problem, separate from the source compression problem. This approach is based on Shannon’s work, which states that in principle source and channel coding tasks can be carried out independently with no loss of efficiency. However, this cannot be achieved in practice due to delay requirements and other problems. As an alternative, one can tolerate channel losses. Assuming that not all the data sent has reached the decoder, one can concentrate on ensuring efficient decoding of the correctly received data only. One way to achieve this is to use multiple description coding (MDC). The source is encoded into several descriptions, which are sent to the decoder independently over different channels. The decoder can reconstruct the source with lower yet acceptable quality from any description received. Better reconstruction quality is obtained from more descriptions. This thesis investigates MDC of images, video, stereoscopic video, and 3D meshes thus validating MDC as an error resilience tool for various types of multimedia data. The thesis consists of four main chapters. Chapter 2 deals with MDC of images. It introduces an MDC algorithm

4 citations

Proceedings ArticleDOI
15 Dec 2003
TL;DR: A stereo image CODEC, that uses overlapped block disparity estimation/compensation in multiresolution wavelet transform domain, to improve rate distortion performance of OBM and discreteWavelet transform's versatile time-frequency localization.
Abstract: In this paper we propose a stereo image CODEC, that uses overlapped block disparity estimation/compensation in multiresolution wavelet transform domain. Overlapped block matching is known to be able to reduce blocking artifacts by linearly combining multiple blocks provided by the disparity vectors of a block and its neighbours. This capability of OBM and discrete wavelet transform's (DWT) versatile time-frequency localization is expected to improve rate distortion performance. With the proposed CODEC gains of up to 1 dB at low bit rates as compared to the benchmark of S. Sethuraman et al. (1994) used in the paper.

3 citations


Cites background from "Compression Of Stereo Images And Th..."

  • ...Based on this, many pixel, block and object based stereo image compression algorithms have been proposed [1-7,9-10]....

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Proceedings ArticleDOI
07 Jan 2004
TL;DR: The proposed algorithm shows improvements in rate control as well as in PSNR compared to the conventional methods and provides more accurate rate control and higher image quality than TM5 and TMN8 at various bits rates.
Abstract: This paper presents an accurate bit rate and quality control algorithm for 3D multiview sequences. We remodel the quadratic rate-distortion model for 3D multiview sequences based on their picture types. The proposed method consists of two levels for more accurate bits rate control. In a frame level, it sets quantization parameters based on HVS (Human Visual System) and reduces error bits by remodeling rate-quantization. In a MB level, rate control is activated to provide stricter buffer regulations and higher bit rate encoding based on the target bits and the quantization parameters calculated at the frame level. The proposed algorithm shows improvements in rate control as well as in PSNR compared to the conventional methods. It also provides more accurate rate control and higher image quality than TM5 and TMN8 at various bits rates.

2 citations


Cites background from "Compression Of Stereo Images And Th..."

  • ...2 Setting Quantization Parameters for the Perceived Depth In the study of the HVS, many researchers showed that spatial low pass filtering, when applied to either the left sequences or the right sequences, does not affect the overall perceived depth or the sharpness [7], [8], [15], [16]....

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References
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Book
01 Jan 1978
TL;DR: In this paper, a unified experimental approach to the study of the mind based on experiments concerning the time course of human information processing is described, drawing systematically on studies of performance, subjective experience, and brain processes.
Abstract: In this widely cited volume, Professor Posner describes a unified experimental approach to the study of the mind based on experiments concerning the time course of human information processing. Drawing systematically on studies of performance, subjective experience, and brain processes, he develops relationships between cognitive psychology and neuroscience. Professor Posner has written a new preface for the paperback edition.

69 citations