Mobile cinema: canonical processes for video adaptation

Kopf, Stephan; Effelsberg, Wolfgang

doi:10.1007/s00530-008-0135-z

Cited by 7 publications

(7 citation statements)

References 14 publications

(11 reference statements)

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“…The disadvantage of the proposed adaptation is that the adaptation process might lead to losses in the semantic information when the video is cropped [17].…”

Section: Adaptive Multimedia For Mobile Devicesmentioning

confidence: 99%

“…Mobile Cinema [17] is an application that adapts highresolution multimedia content for mobile devices by considering the screen resolution, the bit rate or the color depth of the mobile device when performing the adaptation. The disadvantage of the proposed adaptation is that the adaptation process might lead to losses in the semantic information when the video is cropped [17].…”

Section: Adaptive Multimedia For Mobile Devicesmentioning

confidence: 99%

“…The adaptation of the multimedia content has been performed for different purposes, such as adapting the content to the mobile device characteristics [17], optimizing the delivery bandwidth [18] or increasing the battery life [19].…”

Section: Adaptive Multimedia For Mobile Devicesmentioning

confidence: 99%

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Cost-Oriented Adaptive Multimedia Delivery

Molnar

Muntean

2013

IEEE Trans. on Broadcast.

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Mobile Internet and mobile services that make use of mobile data are increasingly popular. However, the cost of content delivery, in particular, multimedia type content over cellular networks is still high and poses a challenge for some users who are not necessarily willing or cannot afford to pay too much for it. The problem is further exacerbated when video content is used, as this type of content is heavier and can lead to higher bills. In this context, this paper presents a novel cost-oriented adaptive multimedia delivery (COMEDY) mechanism that considers the user's willingness to pay for a certain video quality and user's mobile device characteristics to deliver adaptive multimedia content over wireless connection. The goal of the mechanism is to reduce the cost of multimedia delivery for users that are not willing to pay that much. The mechanism is evaluated both through objective and subjective studies. The evaluation shows that the proposed mechanism provides a reduction in the price paid for accessing multimedia content, and the user's perceived quality is not negatively affected.Index Terms-Adaptive multimedia, cost of multimedia delivery, mobile data billing plans, mobile devices.

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“…The disadvantage of the proposed adaptation is that the adaptation process might lead to losses in the semantic information when the video is cropped [17].…”

Section: Adaptive Multimedia For Mobile Devicesmentioning

confidence: 99%

Section: Adaptive Multimedia For Mobile Devicesmentioning

confidence: 99%

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Cost-Oriented Adaptive Multimedia Delivery

Molnar

Muntean

2013

IEEE Trans. on Broadcast.

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“…In our mobile cinema project, 7 we have implemented an extension for videos, which automatically segments and classifies moving objects. 8,9 Additional semantic features like people or moving objects improve the selection of a region.…”

Section: Pixel Removingmentioning

confidence: 99%

Seam carving with improved edge preservation

et al. 2010

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Figure 1. Our new algorithm compared to scaling and regular seam carving with forward energy. In this example, the width is reduced to 60% of the original size. ABSTRACTIn this paper, we propose a new method to adapt the resolution of images to the limited display resolution of mobile devices. We use the seam carving technique to identify and remove less relevant content in images. Seam carving achieves a high adaptation quality for landscape images and distortions caused by the removal of seams are very low compared to other techniques like scaling or cropping. However, if an image depicts objects with straight lines or regular patterns like buildings, the visual quality of the adapted images is much lower. Errors caused by seam carving are especially obvious if straight lines become curved or disconnected. In order to preserve straight lines, our algorithm applies line detection in addition to the normal energy function of seam carving. The energy in the local neighborhood of the intersection point of a seam and a straight line is increased to prevent other seams from removing adjacent pixels. We evaluate our improved seam carving algorithm and compare the results with regular seam carving. In case of landscape images with no straight lines, traditional seam carving and our enhanced approach lead to very similar results. However, in the case of objects with straight lines, the quality of our results is significantly better.

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“…We use a server-based system which is not only suitable for the adaptation of images and web pages, but supports audio streams and videos, too. 8,9 x Considered hardware of mobile devices: Most adaptation systems support the resolution of the display 10,11 and indirectly consider the limited amount of memory, capacities of wireless networks and CPU power. 12 Other features like the color depth of the display, 13,14 available network capacities or energy consumption are relevant in some scenarios, too.…”

Section: Related Workmentioning

confidence: 99%

Adaptation of web pages and images for mobile applications

et al. 2009

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In this paper, we introduce our new visualization service which presents web pages and images on arbitrary devices with differing display resolutions. We analyze the layout of a web page and simplify its structure and formatting rules. The small screen of a mobile device is used much better this way. Our new image adaptation service combines several techniques. In a first step, border regions which do not contain relevant semantic content are identified. Cropping is used to remove these regions. Attention objects are identified in a second step. We use face detection, text detection and contrast based saliency maps to identify these objects and combine them into a region of interest. Optionally, the seam carving technique can be used to remove inner parts of an image. Additionally, we have developed a software tool to validate, add, delete, or modify all automatically extracted data. This tool also simulates different mobile devices, so that the user gets a feeling of how an adapted web page will look like. We have performed user studies to evaluate our web and image adaptation approach. Questions regarding software ergonomics, quality of the adapted content, and perceived benefit of the adaptation were asked.

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Mobile cinema: canonical processes for video adaptation

Cited by 7 publications

References 14 publications

Cost-Oriented Adaptive Multimedia Delivery

Cost-Oriented Adaptive Multimedia Delivery

Seam carving with improved edge preservation

Adaptation of web pages and images for mobile applications

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