High-efficiency image compression method based on spatial domain downsampling mode
An image compression and spatial domain technology, applied in the field of image processing, can solve the problem of single coding mode
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[0097] The present invention mainly adopts the mode of simulation experiment to verify the feasibility of the system model, and all steps have been verified by experiment. In order to realize the image compression based on the transform domain down-sampling technology, the specific implementation steps are as follows:
[0098] Step 1, image preprocessing
[0099] Set image width W=16 m , the image height H=16 n , where m and n are all natural numbers, divided into N=(W×H) / 16 according to the image block method in the traditional JPEG image compression standard 2 A non-overlapping square image block with a size of 16×16, denoted as B 1 , B 2 ,...,B i ,...,B N , where N represents the total number of image blocks after image division, i represents the index of the image block, i∈{1, 2,..., N};
[0100] Step 2, downsampling of image blocks
[0101] First, define a downsampled image block with a size of 8×8 as B' i ; Here, i represents the index of the image block, i ∈ {1,...
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