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Method for rapidly browsing remote sensing image of hand-hold equipment

A hand-held device and remote sensing image technology, applied in the field of image processing, can solve the problems of large memory and other resource requirements, slow speed, and inconvenient use, and achieve the effect of small memory and other resources, satisfying real-time applications, and fast decoding speed

Inactive Publication Date: 2008-12-17
SCHOOL OF SOFTWARE & MICROELECTRONICS PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One is that the speed is very slow and cannot meet the needs of users;
[0006] Second, there is a large demand for memory and other resources, which cannot be met by many handheld devices;
[0007] Third, arbitrary zoom display and partial browsing cannot be realized, which is inconvenient to use

Method used

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  • Method for rapidly browsing remote sensing image of hand-hold equipment
  • Method for rapidly browsing remote sensing image of hand-hold equipment
  • Method for rapidly browsing remote sensing image of hand-hold equipment

Examples

Experimental program
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Embodiment Construction

[0065] When browsing a JPEG file for the first time, a code stream data table is established, and each time a certain area is browsed in the future, for each block in this area, the code stream information of the block is searched in the code stream data table for decoding. Since the unit of JPEG compression is 8X8, it is most appropriate to create a table in units of 8X8 blocks. The unit is a block of 8X8 pixel size. The content of the code stream data table, such as Figure 5 As shown, the data information of each block includes: DC coefficient value (DC), actual length of Huffman data starting position of Huffman data, file pointer, bit buffer, and bit pointer.

[0066] If the image width is ImageWidth pixels, the height is ImageHeight pixels.

[0067] The number of rows of blocks on the widthwise image is

[0068] BlockNumX = ImageWidth + 7 8 - - ...

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Abstract

The invention discloses a method for rapidly browsing handheld apparatus remote sensing pictures, comprising the steps of: 1) partitioning entire picture data and establishing a code stream data table recoding data information of data blocks; 2) searching for the code stream data table according to a region to be displayed and confirming the data block to be decoded; 3) decoding the data block to be decoded in accordance with scaling, and meanwhile, sufficiently operating information of direct current coefficients in JPEG file without Huffman decoding and IDCT conversion on condition that the scaling is a multiple of 8, so as to realize rapid browsing for the pictures. The inventive method can decode the JPG file that is extremely large, and has the characteristics of fast decoding speed, meeting the demand of real-time application, small occupied memory resources while decoding, browsing arbitrary regions of the picture and scaling the arbitrary regions of the picture at will.

Description

technical field [0001] The invention relates to a browsing method of remote sensing images, in particular to a fast browsing method of remote sensing images of a handheld device, which belongs to the field of image processing. Background technique [0002] With the continuous development of digital imaging technology, the data volume and content of digital maps and remote sensing images are also increasing, especially remote sensing images, which are hard-won, low compression rate, and very large files. Digital Land of Massive Spatial Data Figure 1 Generally compressed to JPEG file format. [0003] Handheld devices such as mobile phones, PDAs, and GPS have been used in various fields of society and life. The rapid browsing of remote sensing images on handheld devices is of great help to the environment, planning, surveying, navigation, and transportation. The handheld device is easy to carry, and you can browse the image by selecting the area to be displayed through the bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24G06T9/00H04N21/4405
Inventor 曹喜信黄小明刘宏志曹健于敦山张兴
Owner SCHOOL OF SOFTWARE & MICROELECTRONICS PEKING UNIV
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