Simple implementation of the visual cryptography scheme based on Moni Naor and Adi Shamir, Visual Cryptography, EUROCRYPT 1994, pp1–12. This technique allows visual information like pictures to be encrypted so that decryption can be done visually.

The code outputs two files. Try printing them on two separate transparencies and putting them one on top of the other to see the hidden message.

Implementation of Local Binary Pattern (LBP), a simple but very efficient texture operator which labels the pixels of an image by thresholding the neighborhood of each pixel with the value of the center pixel. It considers the result as a binary number.

LBP texture operator has become a popular approach in various applications. It can be seen as a unifying approach to the traditionally divergent statistical and structural models of texture analysis.

LBP operator is robust to monotonic gray scale changes caused by illumination variations, etc.