Gallery — Math

Watermarking technique for the image is an efficient method for protecting copyright image, and also a huge topic in cryptography. In this paper, two spread spectrum watermarking scheme, the Convolution Image-based Model (CIM) and the Exponential Convolution Image-based Model (ECIM) are going to be formulated and discussed. The watermarking experiment result will be shown and discussed, focusing on the attack scheme, protectability, and the information encryption of the watermark. We will show that the convolution image-based model for invisible watermark is weak of protectability, but it is able to hide the information (the size of watermark must be less than the original image) and store inside the image.

Algebra Linear

Teoría de números

Merge Sort vs. Bubble Sort

The South Pole...

Tarea 1

Primeiras questões respondidas do banco de Cálculo 1 da UFAL.

Solucions del parcial del día 9/4/2015.

174 tutorial