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

一种手持设备遥感图像快速浏览方法

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.
本发明公开了一种手持设备遥感图片快速浏览方法,其步骤为:1)对整个图像数据进行分块,建立记录数据块数据信息的码流数据表;2)根据要显示的区域查找码流数据表,确定要解码的数据块;3)根据缩放比例对要解码的数据块进行解码,同时在缩放比例为8的倍数的情况下,充分运用JPEG文件中直流系数信息,不需要做Huffman解码和IDCT变换;从而实现图片快速浏览。本发明的方法可以实现解码非常大的JPG文件,具有解码速度快、满足实时应用需要、解码占用的内存资源小、浏览图片任意区域、任意缩放图像任意区域的特点。

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