Color metasurface holograms are powerful and versatile platforms for modulating the amplitude, phase, polarization, other properties of light at multiple operating wavelengths. However, current color holography can only realize static manipulation. In this study, we propose demonstrate a multiplexing technique combined with multiwavelength code-division (CDM) to dynamic Multicolor code referenc...

To reproduce an image, it is necessary to map out of gamut colors of the image to destination gamut. It is clear that the best color gamut mapping introduces the perceptually closest image to the original one. In this study, a new color gamut mapping is purposed by the aid of Genetic Algorithm (GA). The color difference between the original and mapped images based on S-LAB formula was chosen as...

This paper focuses mainly on the different image encryption algorithms and various parameters. As the use of digital techniques for transmitting and storing images are increasing, it becomes an important issue that how to protect the confidentiality, integrity and authenticity of images. There are various techniques to encrypt the images for making the images more secure. Therefore, along with ...

The current algorithm of encrypting images uses low-dimensional chaotic systems with a limited key space and poor security, while high-dimensional are difficult to implement inefficient. Additionally, if image encryption algorithms use fixed DNA encoding rules, they could be cracked; dynamic coding can easily deviate from optimal solutions, thus causing instability. Based on this, novel techniq...

Image scrambling is used to make images visually unrecognizable such that unauthorized users have difficulty decoding the scrambled image to access the original image. This article presents two new image scrambling algorithms based on Fibonacci p-code, a parametric sequence. The first algorithm works in spatial domain and the second in frequency domain (including JPEG domain). A parameter, p, i...

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract-Biometric authentication systems are gaining widespread popularity in recent years due to the advances in sensor technologies as well as improvements in the matching algorithms. Preserving the privacy of digital biometric data stored in a central d...

What we believe to be a new technique, based on a modified Gerchberg-Saxton algorithm (MGSA) and a phase modulation scheme in the Fresnel-transform domain, is proposed to reduce cross talks existing in multiple-image encryption and multiplexing. First, each plain image is encoded and multiplexed into a phase function by using the MGSA and a different wavelength/position parameter. Then all the ...

We present a color image encryption algorithm by using chaotic mapping and Hartley transform. The three components of color image are scrambled by Baker mapping. The coordinates composed of the scrambled monochrome components are converted from Cartesian coordinates to spherical coordinates. The data of azimuth angle is normalized and regarded as the key. The data of radii and zenith angle are ...