Image self-adaptation down-sampling method depending on interpretation
An interpolation method, an adaptive technique
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specific Embodiment approach 1
[0014] Specific implementation mode one: combine figure 1 Describe the present embodiment, the interpolation-dependent image adaptive downsampling method described in the present embodiment, it comprises concrete steps as follows:
[0015] Step 1. Generate a downsampled image for a given interpolation method and input image, and interpolate a high-quality upsampled image from the downsampled image;
[0016] Step 2. For the up-sampled image obtained in step 1, adopt a block-based image adaptive down-sampling method, use the information related to the current block and use the cumulative sum of the product of it and the corresponding interpolation coefficient as a constant vector to improve the down-sampling method. The quality of the sampled image;
[0017] Step 3, judging whether it is an interpolation irrelevant to the content; if yes, execute step 4; if not, execute step 5;
[0018] Step 4, a content-independent interpolation-dependent image adaptive downsampling method, c...
specific Embodiment approach 2
[0021] Specific embodiment two: the specific process of step one in the interpolation-dependent image adaptive downsampling method described in specific embodiment one is:
[0022] Let Y denote the input image of size M×N, and X denote the downsampled image of size M / 2×N / 2, Indicates the upsampled image generated after interpolation; the purpose of adaptive downsampling is to obtain a subsampled image, from which we can obtain a higher quality interpolated image; therefore, X needs to satisfy:
[0023] X = arg min x | | Y ^ - Y | | 2 - - - ( 1 )
[0024] where X=[X 0，0 , X 0，1 ,...,X 0，N / 2-1 , X 1，0 , X 1，1 ,...,X 1，N / 2-1 ,...,X M / 2-1，0 , X M / 2...
specific Embodiment approach 3
[0035] Embodiment 3: The specific process of step 2 in the interpolation-dependent image adaptive downsampling method described in Embodiment 1 is as follows:
[0036] A block-level interpolation-dependent image adaptive downsampling method described by m×n-sized blocks and bilinear interpolation, figure 2 The size of the middle block is 8x8 and all points surrounded by solid lines belong to the same block. It is obvious that most interpolated pixels utilize pixels within the same block. However, for some boundary pixels, the interpolation also involves some pixels outside the current block, such as figure 2 For gray pixels in , the interpolation process involves downsampled pixels outside the current window. If all the downsampled pixels in the same block are represented as a column vector, which is the solution of the present invention, other unknown variables will be introduced (outside the current block, and the downsampled pixels involved in the interpolation of the c...
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