Kỹ thuật thủy vân thuận nghịch và ứng dụng bảo vệ bản quyền cho ảnh 3D

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Tác giả: Cao Hoài Phương Nguyễn

Ngôn ngữ: Vie

Ký hiệu phân loại: 621 Applied physics

Thông tin xuất bản: Tạp chí Khoa học Đại học Thủ Dầu Một, 2022

Mô tả vật lý: 102-110

Bộ sưu tập: Metadata

ID: 406685

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Chủ đề

Hiện nay, công nghệ 3D (three-dimensional) phát triển mạnh mẽ đáp ứng tốt nhu cầu giải trí của con người ví dụ như ảnh 3D, phim ảnh trên kính thực tế ảo, ti vi 3D,... Các tác giả của các tác phẩm này cũng cần được bảo vệ bản quyền khi được mang ra thị trường. Do đó, thủy vân số được xem là một công cụ hữu hiệu để bảo vệ cơ sở dữ liệu trên các môi trường trao đổi không an toàn. Từ thực tế đó, bài báo trình bày kỹ thuật xử lý ảnh 3D (three-dimensional) gồm: kỹ thuật tái hiện lại ảnh 3D và kỹ thuật thủy vân thuận nghịch dựa trên phương pháp biến đổi cosin rời rạc được kết hợp với mã hóa mẫu tin thủy vân giúp cho khả năng nhúng và tách mẫu tin thủy vân đạt chất lượng. Theo (Lei Chen, 2020) tấn công thường gặp là tấn công nén JPEG (Joint Photographic Experts Group) để đánh giá hiệu quả của việc giấu thông tin. Kết quả đánh giá cho thấy chất lượng ảnh vẫn còn tốt thể hiện ở giá trị tỉ lệ tín hiệu cực đại trên nhiễu trên 35dB và việc tách ấn thủy vẫn đảm bảo ở chỗ tỉ lệ bit lỗi dưới 1,5% mặc dù tấn công nén JPEG được giảm xuống với tỉ lệ thấp nhất là 65%., Tóm tắt tiếng anh, Currently, 3D (three-dimensional) technology has developed strongly to meet people's entertainment needs, such as 3D images, movies on virtual reality glasses, 3D televisions, etc. Author of these works also needs to be protected by copyright when it is brought to the market. Therefore, digital watermarking is considered an effective tool to protect databases on insecure exchange environments. From that fact, the paper presents 3D image processing techniques (three-dimensional) including: 3D image reconstruction technique and reversible watermarking technique based on discrete cosine transform method combined with code Watermarking patternization helps to embed and separate quality watermark records. According to (Lei Chen, 2020), a common attack is a JPEG (Joint Photographic Experts Group) compression attack to evaluate the effectiveness of information hiding. The evaluation results show that the image quality is still good, reflected in the maximum signal-to-noise ratio value of over 35dB and the watermark separation is still guaranteed in that the bit error rate is less than 1.5% despite the attack. JPEG compression is reduced to as low as 65%.

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