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

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