Method and apparatus for reducing the size of image data

An image, input image technology, applied in image data processing, image communication, graphic image conversion, etc., can solve the problem of high-resolution images consuming storage space or data transmission capacity, and achieve the effect of reducing power consumption

Inactive Publication Date: 2011-12-14
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] High resolution images can consume a l

Method used

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  • Method and apparatus for reducing the size of image data
  • Method and apparatus for reducing the size of image data
  • Method and apparatus for reducing the size of image data

Examples

Experimental program
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Embodiment Construction

[0056] figure 1 A filter array FA1 is shown. By using the filter array FA1, the digital input image IMG1 can be converted into a digital output image IMG2. The value of each output pixel of the output image can be determined by superimposing the filter array FA1 on the input image so that the position of the filter array FA1 substantially matches the position of the output pixel, and by implementing A sum-of-products operation between the value of the element E of the filter array FA1 and the value of the input pixel of the input image. When computing the product of the product-sum operation, each value of a predetermined element E(m,n) is multiplied by the value of an input pixel whose position is multiplied by the predetermined element E( The positions of m, n) coincide.

[0057]By implementing the product-sum operation, the image data of the output image IMG2 can be compressed relative to the image data of the input image IMG1. In particular, the output image IMG2 may h...

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Abstract

An input image (IMG1) may be converted to a lower-resolution output image (IMG2) by: determining a location (OP) of an output pixel (P2) with respect to said input image (IMG1), determining values of elements (E) of a filter array (FA1) such that non-zero values of the elements (E) of said filter array (FA1) approximate a paraboloid reference surface (REFS), wherein said reference surface (REFS) has a maximum at a base point (BP), and determining a value of said output pixel (P2) by performing a sum-of-products operation between non-zero values of said elements (E) and values of input pixels (P1) of said input image (IMG1) located at respective positions, wherein said filter array (FA1) is superimposed on said input image (IMG1) such that the location of said base point (BP) corresponds to the location of said output pixel (P2).

Description

technical field [0001] The present invention relates to compression of image data. Background technique [0002] High resolution images can consume a lot of storage space or data transfer capacity. It may be desirable to compress image data. [0003] It is known that the number of pixels of an image can be reduced, for example by binning or decimation. [0004] WO2005 / 106787 discloses a method and apparatus for reducing the resolution of a digital image by calculating a weighted average of pixel values. Contents of the invention [0005] It is an object of the invention to provide a method for compressing image data. A further object of the present invention is to provide a method for determining values ​​of a filter array suitable for compressing image data. A further object of the present invention is to provide a computer program and a computer readable medium comprising said computer program for performing said method. A further object of the present invention is ...

Claims

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Application Information

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IPC IPC(8): G06T3/40
CPCH04N19/00775H04N19/0089H04N7/26377H04N1/648H04N7/30H04N7/26292H04N19/00066G06T3/4007H04N5/23245H04N19/00757H04N7/465H04N1/622H04N19/00315H04N7/26058H04N5/23229H04N19/60H04N19/117H04N19/186H04N19/80H04N19/59H04N23/667H04N23/80G06T3/40
Inventor O·卡莱沃
Owner NOKIA TECHNOLOGLES OY
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