Method for embedding watermark into an image and digital video recorder using said method

A method for embedding watermark into an image, comprising:

• generating a pseudo random sequence;
• generating a watermark sequence by circular-shifting said pseudo random sequence by the distance d;
• multiplying said watermark sequence by a coefficient representing watermark embedding strength;
• generating a watermark-embedded image in a frequency transformation domain by adding the multiplied watermark sequence to a wavelet-transformed original image;
• and
• generating a watermark-embedded image in a spatial domain by inverse wavelet-transforming said watermark-embedded image.

A method for embedding watermark into an image, comprising:

• generating a pseudo random sequence;
• generating a watermark sequence by circular-shifting said pseudo random sequence by the distance d;
• inverse wavelet-transforming said watermark sequence;
• multiplying said inverse wavelet-transformed watermark sequence by coefficient representing watermark embedding strength;
• and
• generating a watermark-embedded image by adding said multiplied watermark sequence to an original image in spatial domain.

A method for embedding watermark into an image, comprising:

• generating a pseudo random sequence;
• generating a watermark sequence by circular-shifting said pseudo random sequence by the distance d;
• discrete cosine transforming an original image;
• replacing LSB of DC coefficients or AC coefficients among the discrete cosine transformed coefficients with said watermark sequence;
• and
• inverse discrete cosine transforming the image of which said LSB is replaced.

A method for embedding watermark into an image, comprising:

• generating a pseudo random sequence;
• generating a watermark sequence by circular-shifting said pseudo random sequence by the distance d;
• inverse discrete cosine transforming said watermark sequence;
• and
• adding said discrete cosine transformed watermark sequence to an original image.

A method for embedding watermark into an image simultaneously with MPEG compression for the image, comprising:

• discrete cosine transforming an input image;
• quantizing said discrete cosine transformed image;
• configuring watermark using the quantized DCT coefficient;
• embedding said watermark into said image;
• and
• variable length coding the watermark-embedded image.

A method for embedding watermark into an image simultaneously with MPEG compression for the image, comprising:

• inputting quantized DCT coefficient of a corresponding macro block in said image;
• dividing each DCT block of said corresponding macro block into a signature extracting region and a watermark embedding region;
• combining said quantized DCT coefficient in said signature extracting region with user information;
• obtaining a hash value by regarding said combined value as an input value of the hash function;
• and
• embedding said hash value into LSB of the quantized DCT coefficient in said watermark embedding region.

A method for embedding watermark into an image simultaneously with MPEG compression for image, comprising:

• inputting quantized DCT coefficients of all macro blocks in corresponding slice in said image;
• dividing each DCT block of said macro blocks into the signature extracting region and the watermark embedding region;
• combining said quantized DCT coefficients in said signature extracting region with user information;
• obtaining hash value by regarding said combined value as an input value of hash function;
• and
• embedding said hash value into LSB of quantized DCT coefficient in watermark embedding region in next slice of said corresponding slice.

A method for embedding watermark into an image simultaneously with JPEG compression for image, comprising:

• discrete cosine transforming an input image;
• quantizing said discrete-cosine transformed image;
• configuring watermark using the quantized DCT coefficient;
• embedding said watermark into said image;
• and
• entropy coding the watermark-embedded image.

A method for embedding watermark into an image simultaneously with wavelet compression for image, comprising:

• dividing quantized wavelet coefficients of wavelet compression process into a signature extracting region and a watermark embedding region;
• combining said quantized wavelet coefficient in said signature extracting region with user information;
• obtaining a hash value regarding said combined value as an input value of a hash function;
• and
• making LSB in said watermark embedding region 0, and embedding said hash value bit therein.