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Method for processing a digital image and image representation format

A digital image and table technology, applied in the field of digital image processing, can solve the problems that may not necessarily require a large storage capacity of digital images, and achieve the effect of low processing capacity, small storage space, and fast access

Inactive Publication Date: 2009-09-02
NOKIA TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large storage requirements of digital images represented in the spatial domain cannot necessarily be handled when processing images on a unit with small storage space, such as a mobile phone

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  • Method for processing a digital image and image representation format
  • Method for processing a digital image and image representation format
  • Method for processing a digital image and image representation format

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Embodiment Construction

[0055] In the following description, compression of images will be described with reference to JPEG compression, although other compression using other transforms can also be considered. It should be noted that the scope of protection of the present invention is by no means limited to JPEG compression.

[0056] see now figure 1 , a method for compressing digital images will be described. First, at step 10, a digital image is represented by a YUV color model, where each pixel in the image has three components: luminance Y, and two chrominance components U and V. The two chrominance components U and V represent color features whose fine details are difficult to perceive by the human eye. Therefore, these components can be represented at a lower resolution than the luma component. A 16×16 pixel block of an image as an example of an image block defined here can be composed of four Y data units of 8×8 pixels each, one U data unit of 8×8 pixels, and one V data unit of 8×8 pixels....

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Abstract

An image representation format for representing a digital image comprises: image information stored as a bitstream representing sequential image blocks, each block comprising one or more components, each component comprising one or more data units and each data unit being represented as a Huffman-coded stream of coefficients of basis functions, wherein a zeroth order coefficient is represented as a difference to the previous zeroth order coefficient of the corresponding component, and a block information table, which comprises: indicators to the first coefficient of a specified order of each image block in said bitstream, information indicating the number of bits in the bitstream between adjacent coefficients of said specified order of the image block, and the zeroth order coefficient of at least the first data unit of each component, said zeroth order coefficient being represented in a non-differential form.

Description

technical field [0001] The invention relates to methods of processing digital images and image representation formats for representing digital images. The invention further relates to methods for encoding raw image data into compressed digital image representations, and methods of analyzing JPEG-compressed digital images. Background technique [0002] In today's society, huge amounts of information are created every day. Much information is presented in the form of images. Furthermore, most information is stored and presented electronically, eg on the Internet. At the same time, the use of wireless connections to the Internet in which data transfer rates are relatively low is increasing. Therefore, there is a need to present information in a very compact form. This is especially important for images, since normal digital images stored as arrays of pixels are represented as fairly large data sets. [0003] Furthermore, mobile phones that include cameras are becoming incr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/00G06TH04N19/00H04N19/60
Inventor 乔安·斯坦撒米·尼米卡尔-安德斯·乔纳森
Owner NOKIA TECH OY