Abstract: In the field of image encryption and decryption, in order to solve the problem of small key space in the encryption process caused by low dimension of one-dimensional chaotic map and few initial values and control parameters, the present disclosure provides an image encryption and decryption communication algorithm based on two-dimensional lag complex Logistic map, which expands the variables of one-dimensional Logistic map from the real number domain to the complex number domain, improves the dimension of the mapping system, increases the number of keys, and expands the mapping range, wherein the new mapping system is more sensitive to small disturbances of initial values and parameters, which can break the strong correlation between pixels in the original image, so that the pixels of the encrypted image are uniformly distributed in the whole plane, and the features of the original image are hidden.

Abstract: The present invention provides a full-screen display method for an upright image that includes the following steps: reading the resolution of the second image, the resolution of the second image is a:b; extracting from the said second image to generate the third image, the resolution of the third image is b:a; the center line of the second image and of the third image coincide in both the horizontal and vertical directions; the number of pixels of the second image in the vertical direction is the same as that of the third image in the vertical direction; rotating the third image by 90 degrees along the set direction generates the fourth image; and finally displaying the fourth image full-screen on the said display device. The present invention also provides the mirroring same-screen device, the display device, the full-screen display system for upright images, and the computer readable storage medium to perform the previous steps of the full-screen display method for upright images.

Abstract: In the field of image encryption and decryption, in order to solve the problem of small key space in the encryption process caused by low dimension of one-dimensional chaotic map and few initial values and control parameters, the present disclosure provides an image encryption and decryption communication algorithm based on two-dimensional lag complex Logistic map, which expands the variables of one-dimensional Logistic map from the real number domain to the complex number domain, improves the dimension of the mapping system, increases the number of keys, and expands the mapping range, wherein the new mapping system is more sensitive to small disturbances of initial values and parameters, which can break the strong correlation between pixels in the original image, so that the pixels of the encrypted image are uniformly distributed in the whole plane, and the features of the original image are hidden.

Abstract: The present invention provides a full-screen display method for an upright image that includes the following steps: reading the resolution of the second image, the resolution of the second image is a:b; extracting from the said second image to generate the third image, the resolution of the third image is b:a; the center line of the second image and of the third image coincide in both the horizontal and vertical directions; the number of pixels of the second image in the vertical direction is the same as that of the third image in the vertical direction; rotating the third image by 90 degrees along the set direction generates the fourth image; and finally displaying the fourth image full-screen on the said display device. The present invention also provides the mirroring same-screen device, the display device, the full-screen display system for upright images, and the computer readable storage medium to perform the previous steps of the full-screen display method for upright images.