Image encryption method, device and system

The embodiment of the invention discloses an image encryption method, device and system. The image encryption method comprises the following steps: acquiring a pre-encrypted image; sequentially performing sparse processing, threshold processing, scrambling processing, quantization processing and diffusion processing on the pre-encrypted image according to the pre-encrypted image to obtain a diffusion matrix; dividing the diffusion matrix into a plurality of sub-matrixes according to the diffusion matrix, and replacing elements at preset positions in the diffusion matrix with preset elements to obtain encrypted sub-matrixes; and re-combining the encrypted sub-matrixes to obtain a combined sub-matrix, and replacing the channel of the pre-encrypted image with the combined sub-matrix to obtain an encrypted image matrix. According to the image encryption method, device and system provided by the embodiment of the invention, dual protection on the content and vision of the plaintext image can be realized. 本发明实施例公开了