This repository contains the Python implementation for an undergraduate research project based on the article "Digital image watermarking using discrete cosine transformation based linear modulation" ...

With the deep iteration and innovation of information technology, medical technology is moving towards informatization and intelligence. This has led to a large-scale collection of medical imaging ...

Advancements in technology have led to medical data being stored digitally for diagnosis. But this poses risks like manipulation and misuse during transmission. It is important for copyright ...

Abstract: Digital watermarking techniques are becoming necessary in developing society due to rapid growth of technology and high internet usage. It concerns with embedding the authentication identity ...

Abstract: A combined DWT and DCT based watermarking technique with low frequency watermarking with weighted correction is proposed. DWT has excellent spatial localization, frequency spread and ...

フーリエ変換の応用として最も重要な例としてjpgなどの画像圧縮があります。実際に離散コサイン変換をして画像圧縮するところまでやってみたいと思うのですが、今回は一旦単なるデータ列に対する離散コサイン変換（DCT）の実装までやってみようと思い ...

前回Pythonで1次元データ列の離散コサイン変換をやりました。 離散コサイン変換の代表的な応用例といえば画像圧縮。通常画像は$${m\times n}$$ピクセルの2次元データになっているので、離散コサイン変換をするなら、縦方向と横方向の両方に変換をかけて ...