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Method and apparatus to provide efficient multimedia content storage

A device, memory technology, used to capture and store images, modern cellular phones and personal communication devices, can solve the problem of inapplicability

Inactive Publication Date: 2007-05-30
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For various reasons explained below, these conventional file size reduction techniques are not suitable for use with image files produced by an image capture device such as a digital video camera used alone or as part of another device such as a camera phone

Method used

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  • Method and apparatus to provide efficient multimedia content storage

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Embodiment Construction

[0018] The present invention exploits redundancy that may exist between certain captured images to reduce storage space for images. To this end, as a non-limiting example, two images may be considered (at a minimum) to be context-related if one or more of the following criteria are met:

[0019] a) the two images are captured within some short time interval;

[0020] b) the two images were captured at approximately the same location, with the image capture devices pointed at approximately the same azimuth and elevation; and

[0021] c) The user declares or specifies that the two images are contextually related.

[0022] If any of these criteria are met, there may be a significant degree of similarity or redundancy between image files stored in memory, such as that of a digital camcorder or digital video camera. The present invention exploits this potential of image similarity by using one image file as a "base" or "baseline" and compressing another image file by storing only...

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Abstract

Disclosed is a method and a device, that includes a programmed data processor, to process image data. The method includes, for a plurality n of files each containing image data representing one of n images, selecting one file as a base file; selecting as a target file an image data file that is contextually-related file to the base file; comparing the target file and the base file to determine differences therebetween; and storing the target file as a reduced file that is a representation of differences between the image data of the target file and the image data of the base file. An image data file is selected as being contextually-related to the base file based on at least an image capture location, and / or on an image capture time, or based on a user input. Storing can be performed in a memory device that is a part of a wireless communications device, such as a cellular telephone or a personal communicator that includes a digital camera, such as a camera phone.

Description

technical field [0001] The present invention relates generally to efficient use of content storage in multimedia devices, and more particularly to techniques for capturing and storing images in systems with limited memory storage capabilities, such as digital cameras and devices incorporating digital cameras, which Includes modern cellular phones and personal communication devices. Background technique [0002] The use of digital video cameras is expanding rapidly, and the capabilities and performance of digital camera equipment, including digital video cameras and so-called camera phones, are also increasing rapidly. The image resolution of camera phones is expected to increase exponentially, and cameras with image resolutions of 2 megapixels (two million picture elements) are now available for use in camera phones. [0003] Increased camera resolution places stricter demands on the image storage subsystem. For example, a picture taken by a 4-megapixel camera requires a s...

Claims

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Application Information

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IPC IPC(8): H04N1/417H04N7/14H04N7/173H04N7/36H04N7/50
CPCH04N19/00781H04N7/362H04N19/00733H04N7/50H04N7/147H04N1/4177H04N19/51H04N19/61
Inventor 邬涛
Owner NOKIA CORP
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