Image data storage method and system, and image data reading method and system

Abstract

The invention discloses an image data storage method and system, and an image data reading method and system. The storage method comprises the following steps: establishing a rectangular coordinate system in a file in the horizontal direction and the vertical direction of image data, wherein the coordinates of the image data in the rectangular coordinate system use pixels as units; carrying out blocking of the image data in the rectangular coordinate system according to the coordinates to obtain image blocks; creating a pyramid according to the original image data, carrying out lossless compression on the image blocks, and carrying out lossy compression on the pyramid; and writing the compressed image blocks and the compressed pyramid into the file in the form of key-value storage. The image data storage method and system, and the image data reading method and system provided by the invention have the advantages that the lossless compression and the lossy compression are respectively carried out the original image data and the pyramid, so that hardware space is saved, the reading efficiency is high, multi-channel storage is achieved, the image data with different channels and different pixel storage sizes can be stored and read, and wide application prospects in satellite imaging, digital terrain modeling and engineering imaging are achieved.

Description

technical field [0001] The invention relates to the field of data storage, in particular to a method for storing and reading image data. Background technique [0002] In the existing image storage technology, pixels are stored in the form of files, and file operations are required when reading. The acquisition of pixels depends entirely on the header information of the image, so the size of the image is limited by the storage length of the image header information. Taking the TIF format as an example, under the length stipulated in the storage protocol of its header information, the length of a single image file does not exceed 4G. The compression format of a single image file must be uniform. The higher the compression rate, the smaller the hard disk space occupied by the file. At the same time, the greater the actual loss of image information, the more time it takes to decompress when reading. Under the unified compression format, there is an irreconcilable contradiction ...

AI Technical Summary

Problems solved by technology

[0003] In the actual image display process, the display of the affected data is related to the block size of the image data. If the fragmentation is too large, the read and write data will be redundant and the speed will be reduced. If the fragmentation is too small, the number of file accesses will be too many when reading and writing data. slow down

The existing image format does not provide a standard for the image block size, and for images that affect the processing speed, this leads to an unstable read and write efficiency of images of the same format, and for the convenience of storage, most images are only divided into a small number of Several blocks, making these images low read and write efficiency, inconvenient image display processing

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