Mobile Imaging in Sweden Ab

Scalado Ab

Nokia Technologies Oy

Johan Sten

Sami Niemi

The present invention relates to a method for generating an index of Data Units of a Variable Length Coded (VLC) image. The method comprises categorizing Data Unit lengths, DU-lengths, as non indexed DU-lengths, categorizing DU-lengths not categorized as non-indexed DU-lengths as indexed DU-lengths, generating a value indicating the number of subsequent DU-lengths categorized as non-indexed in a sequence of subsequent DU-lengths categorized as non-indexed, generating a value indicating the number of subsequent DU-lengths categorized as indexed in a sequence of subsequent DU-lengths categorized as indexed, generating data representing the DU-length of each DU in the sequence of DU-lengths categorized as indexed, storing said generated values and data in the index of Data Units, and associating said index of Data Units with the VLC image. Further the invention relates to a method for retrieving Data Unit lengths, DU-lengths, from an image associated with an index of DU-lengths. This method comprises linearly reading data from the index, when the data is a value indicating a number of subsequent Data Units categorized as not having indexed DU-lengths then these Data Units is sequentially processed from the image for retrieving the length of each data unit, and when the data is a value indicating a number of subsequent Data Units categorized as having indexed DU-lengths then the corresponding number of DU-lengths are retrieved from the index.

Method for indexing images and for reading an index of an image

There is provided a method for processing a variable length code encoded image having a plurality of scan lines, wherein each scan line has a number of original code blocks including a differentially encoded parameter. The method includes defining a subarea of the image having parts of a number of the scan lines, extracting the subarea, generating a set of auxiliary code blocks having an auxiliary differentially encoded parameter based on the first differentially encoded parameter of a first code block of a first current scan line in the subarea, and associating the auxiliary code blocks with the subarea. There is also provided an apparatus and a computer program product thereof.

Digital information extraction

Methods and apparatus, including computer program products, for generating a data stream encoded by means of a Variable Length Coding scheme. Code words for a data stream including a plurality of code words are encoded in accordance with a Variable Length Coding scheme. A separation marker is inserted between encoded data blocks in the data stream.

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Malmö, Sweden

Johan Sten