Image scaling method

An image scaling and image technology, applied in the field of data processing, can solve problems such as complex and cumbersome bicubic filters, and achieve the effect of reducing computational workload, complexity, and quantity

CN101512595AInactive Publication Date: 2009-08-19TELEFON AB LM ERICSSON (PUBL)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-08-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

In an image scaling method, an image ( 10 ) having an original row / column resolution NO is scaled into a scaled image ( 30 ) having a target row / column resolution NT. A filter set comprising alpha filters is provided, where alpha being equal to a quotient of the target resolution NT and a common denominator k of the original resolution NO and the target resolution NT. The common denominator k is a positive number larger than one. For at least one row / column ( 16 / 18 ) of image elements ( 12 ), a filtered image element ( 32 ) of the scaled image ( 30 ) is formed, for each filter in the filter set, by filtering at least one image element ( 12 ) of the at least one row / column ( 16 / 18 ) using the filter. This image element formation is repeated up to k times over the at least row / column ( 16 / 18 ) to form a scaled row / column ( 36 / 38 ) of image elements ( 32 ) of the scaled image ( 30 ).
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Description

technical field

[0001] The present invention relates generally to data processing, and more particularly to computationally efficient data signal resampling and image scaling methods and apparatus. Background technique

[0002] Electronic image management and display has grown tremendously over the past decade, and today digital photos, movies, television programs, and other multimedia video and image sources can be viewed on a wide variety of different media reproduction machines and devices. Traditionally, these machines were computers, but today portable and handheld devices such as laptops, personal digital assistants (PDAs), dedicated media players and mobile phones are used to view images and videos. These image management and reproduction devices differ widely in their image processing and display capabilities. For example, the display screens available for different image rendering devices can range from the relatively small screen sizes found in some mobile phones,...

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Embodiment Construction

[0041] Throughout the drawings, the same reference numerals will be used for corresponding or identical elements.

[0042] The present invention relates in one aspect to image scaling and provides thus a computationally efficient image scaling while still achieving good image quality. Since the image scaling of the present invention is much less computationally expensive than prior art scaling schemes that provide comparable image quality, the present invention can be used on user terminals and image It is advantageously implemented in a processing device and can be advantageously applied to these user terminals and image processing devices. Thus, the image scaling of the present invention is particularly suitable for implementation in thin clients, such as laptop computers, personal digital assistants (PDAs) and mobile phones. However, other image processing apparatus, such as computers and dedicated image processing and display equipment, can also benefit from the teachings...