Patent ID: 9563936
Date: 2017-02-07
CPC Classifications: G06K,G06T

Claim:
1. A pixel-based method of obtaining a downsampled image, wherein a resolution of an original image is 2M*2N, and a resolution of the downsampled image is M*N; the method comprising steps of: constructing a virtual image by an image super-resolution technology according to the resolution M*N of the downsampled image, wherein a resolution of the virtual image is 2M*2N; determining relational expressions between pixels of the virtual image and pixels of the downsampled image; calculating a mean squared error between the pixels of the virtual image and pixels of the original image based on the relational expressions between the pixels of the virtual image and the pixels of the downsampled image; determining a coefficient matrix between the pixels of the downsampled image and the pixels of the original pixels under the condition of the mean squared error between the pixels of the virtual image and the pixels of the original image being at a minimum value; determining the pixels of the downsampled image according to the pixels of the original image and the coefficient matrix between the pixels of the downsampled image and the pixels of the original image; outputting the downsampled image as per the pixels of the downsampled image; wherein the step of constructing a virtual image by an image super-resolution technology according to the resolution M*N of the downsampled image comprises: constructing the virtual image by an image super-resolution interpolation method according to the resolution M*N of the downsampled image; the step of constructing the virtual image by an image super-resolution interpolation method according to the resolution M*N of the downsampled image comprises: setting P determining interpolation relational expressions between R, G, B subpixel values of the pixels A, B, C of the virtual image and R, G, B subpixel values of the pixels P determining interpolation relations between R, G, B subpixel values of the pixels of the virtual image and R, G, B subpixel values of the pixels of the downsampled image; calculating all the pixels of the downsampled image to construct the virtual image as per the interpolation relations between R, G, B subpixel values of the pixels of the virtual image and R, G, B subpixel values of the pixels of the downsampled image.