帮忙翻译，速度下，

The development of the Internet brings convenience at the same time also brought a lot of information security issues, the traditional means of cryptography to protect and can not really solve the problem. Therefore put forward the information hiding technology, a branch of steganography. Steganography and information security as a multi-media field of study of a new hot spot is being more and more attention. Steganography calendar in the digital age, it became the protection of individuals, organizations an effective tool for private information. Network used mainly used steganography to hide information. Applications in the field of digital image steganography technology, people can not be found from the image changes appearance. Steganography technology and space-based transform domain based steganography methods, and transform domain of covert technology is based on the DCT-domain approach. DCT-domain block-based correlation coefficient between the size of steganography technolo