Patent ID: 11908038
Assignee: TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. An image transformation method, performed by a computer device, the method comprising:
obtaining identification information of an original image;
converting the identification information to an identification image;
performing frequency domain transformation on the original image to obtain a pixel matrix of the original image in a frequency domain space;
performing matrix decomposition on the pixel matrix to obtain an image brightness matrix;
converting pixel values of corresponding pixels in the image brightness matrix based on pixel values of pixels in the identification image to obtain a converted brightness matrix; and
performing inverse frequency domain transformation on the converted brightness matrix to obtain a transformed image including invisible identification information, and adding the invisible identification information to the original image,
wherein the converting the pixel values comprises:
determining an image embedding bit in the identification image;
obtaining a pixel value of the image embedding bit in the identification image;
determining an embedding intensity factor, and determining a pixel adjustment range by using a pixel conversion formula, which is based on the embedding intensity factor and the pixel value of the image embedding bit in the identification image, wherein one of different pixel conversion formulas is selected according to the pixel value of the image embedding bit; and
converting the pixel value of the image embedding bit in the image brightness matrix based on the pixel adjustment range, to obtain the converted brightness matrix.