Image-based personal communication using an innovative space-variant CMOS sensor

Sandini, Giulio; Argyros, Antonis A.; Eric, Auffret,; Dario, P.; Dierickx, B.; Ferrari, F.; Frowein, Han; Guérin, C.; Hermans, L.; Manganas, A.; Mannucci, Anna; Nielsen, Jakob Gaardbo; Questa, Paolo; Sassi, Ameni; Scheffer, Danny; Woelder, W.

doi:10.1109/roman.1996.568790

Cited by 4 publications

(6 citation statements)

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“…In this clip, the camera first underwent a zoom-out, then some pan/tilt motions, finally a zoom-in with pan/tilt was issued. The recovered motion with respect to four pairs of frames with known motions with the three different algorithms are listed in Table 1, where motion 1, 2, 3, and 4 corresponds to zoom-out (q IXH), pan/tilt (2, 4), pan/tilt (12,15), and zoom-in (q HXS) with pan/tilt (-3, -4), respectively. Whereby, one can see that the FREC performs better than the other two methods.…”

Section: Resultsmentioning

confidence: 99%

“…As shown by Sandini and Dario [11], the scaling and centric rotational invariances of the Log-Polar transform make it a useful tool for object recognition. In a more recent project, Sandini et al [12] successfully developed a videophone system for elderly and disabled people, where a camera mounted on a pan-tilt unit with a Log-Polar CMOS sensor delivered video data in an efficient space-variant manner. In spite of its advantages, there is however, a major drawback of the Log-Polar transform.…”

Section: Log-polar Transformsmentioning

confidence: 99%

“…While this kind of ªorientation selectivityº is beneficial to certain object-centered operations such as looming/zooming [12], it is less applicable to most common operations and movements which can be best captured and described in the Cartesian image space where the orientation selectivity of the FWT applies as shown in the preceding stereo example [19]. 3.…”

Section: The Foveate Wavelet Transformmentioning

confidence: 99%

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On active camera control and camera motion recovery with foveate wavelet transform

Wei

2001

IEEE Trans. Pattern Anal. Machine Intell.

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AbstractÐIn this paper, a new variable resolution technique±Foveate Wavelet Transform (FWT) is proposed to represent digital images in an effort to efficiently represent visual data. Compared to existing variable resolution techniques, the strength of the proposed scheme encompasses its linearity preservation, orientation selectivity, and flexibility while supporting interesting behaviors resembling the animate vision system. The linearity preservation of the FWT is due to the fact that only low and/or high-pass filterings are carried out in different regions of an image in the transform. The orientation selectivity indicates the fact that details along the horizontal, vertical, and diagonal directions are readily available in the FWT representation. The flexibility of this new representation technique is witnessed by the readiness of its extensions to represent foveae of different number, shape, and locations. To demonstrate the efficacy of the FWT, two applications are presented. First, an FWT-based active camera control scheme is developed, where the computer can move a camera to track the moving object in the scene. Second, an FWT-based method purporting to recover pan/tilt/ zoom camera movements from video clips is developed. Experiments of these two applications have shown encouraging performances.

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Section: Resultsmentioning

confidence: 99%

Section: Log-polar Transformsmentioning

confidence: 99%

Section: The Foveate Wavelet Transformmentioning

confidence: 99%

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On active camera control and camera motion recovery with foveate wavelet transform

Wei

2001

IEEE Trans. Pattern Anal. Machine Intell.

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“…Delivering multimedia data on a Web client is currently a significant area of research due to the bandwidth bottleneck [15] in particular with streaming video. The current compression technology (e.g.…”

Section: Introductionmentioning

confidence: 99%

Video-Based Sign Language Content Annotation by Incorporation of MPEG-7 Standard

Aouf

Hansen

2005

Lecture Notes in Computer Science

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The advanced progress in multimedia technology increases the demand on delivering effective content in term of quality with the ability to describe content. From the W3C initiative into the web accessibility (WAI), there is a dedicated effort to make data accessible by every person even by people with disabilities. Accordingly, this paper balances the portion between the minimum bandwidth and the optimum required data to display customized video-based sign language. It also describes a systematic approach derived from the MPEG-7 multimedia content description standard to annotate sign language information. A new approach is proposed by this paper. It makes use of an "intermediary" signage object rather than immediate transmission of sign language video clips. Based on the signage object, this research analyses the components in order to enhance the display quality for video-based sign language with less data consumption by determining the accurate display parameters.

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“…The fovea is typically uniformly sampled, while the periphery is sampled according to a log-polar grid. Space-variant sensors that implement in CCD technology the mapping between the Cartesian and log-polar plane are presented in [23,24]. The use of a specific lens system to obtain non-uniform resolution is discussed in [25].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Resolution System for Distributed Surveillance

2002

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Image-based personal communication using an innovative space-variant CMOS sensor

Cited by 4 publications

References 4 publications

On active camera control and camera motion recovery with foveate wavelet transform

On active camera control and camera motion recovery with foveate wavelet transform

Video-Based Sign Language Content Annotation by Incorporation of MPEG-7 Standard

Adaptive Resolution System for Distributed Surveillance

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