Image data encoding system and image inputting apparatus

• US 6,298,142 B1
• Filed: 02/12/1998
• Issued: 10/02/2001
• Est. Priority Date: 02/14/1997
• Status: Expired due to Term

• Current Assignee: NEC Personal Computers, Ltd. (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Hashimoto, Masahiro, Nakano, Hirotaka, Manabe, Koji
• Primary Examiner(s): Johns, Andrew W.
• Assistant Examiner(s): ALAVI, AMIR
• Application Number:
  US09/022,885
• Time in Patent Office: 1,328 Days
• Field of Search: 382/100, 382/115, 382/116, 382/119, 382/137, 382/138, 382/232, 382/238, 382/246, 382/250, 382/251, 382/248, 380/210, 380/252, 380/287, 380/54, 380/51, 713/176, 370/527, 370/529
• US Class Current: 382/100
• CPC Class Codes: G06T 1/0021 Image watermarking
• CPC Class Codes: G06T 1/0035 Output size adaptive watermarking
• CPC Class Codes: G06T 1/20 Processor architectures; Processor configuration, e.g. pipelining
• CPC Class Codes: G06T 2201/0052 Embedding of the watermark in the frequency domain
• CPC Class Codes: G06T 2201/0053 Embedding of the watermark in the coding stream, possibly without decoding; Embedding of the watermark in the compressed domain
• CPC Class Codes: H04N 1/32154 Transform domain methods H04N1/32309 takes precedence
• CPC Class Codes: H04N 1/32165 using cosine transforms
• CPC Class Codes: H04N 1/32187 with selective or adaptive application of the additional information, e.g. in selected frequency coefficients
• CPC Class Codes: H04N 1/32192 according to calculated or estimated visibility of the additional information in the image
• CPC Class Codes: H04N 1/32277 Compression
• CPC Class Codes: H04N 19/00 Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
• CPC Class Codes: H04N 19/467 characterised by the embedded information being invisible, e.g. watermarking
• CPC Class Codes: H04N 19/60 using transform coding
• CPC Class Codes: H04N 21/23892 involving embedding information at multiplex stream level, e.g. embedding a watermark at packet level
• CPC Class Codes: H04N 21/8358 involving watermark protecting executable software by watermarking G06F21/16; image watermarking in general G06T1/0021; watermarks inserted in still images for transmission purposes H04N1/32144; inserting watermarks during video coding H04N19/467
• CPC Class Codes: H04N 2201/324 Selecting a particular authentication information from amongst a plurality of different authentication information

Abstract

An image data encoding system has a discrete cosine transformer for discrete cosine transforming the original image, an electronic watermark data embedding circuit for embedding the electronic watermark data in the data that has been transformed by the discrete cosine transformer, and a data selector for selecting the output signal of the discrete cosine transformer or the output signal of the electronic watermark data embedding circuit. Another image data encoding system has an electronic watermark embedding circuit for embedding electronic watermark data selected from a plurality of types of electronic watermark data to the digital image data, wherein at least one of the plurality of types of electronic watermark data is predetermined electronic watermark data that does not affect the digital image data even if the electronic watermark data is embedded in the digital image data.

Claims

1. An image data encoding system for embedding electronic watermark data to an original image, which comprises:

discrete cosine transforming means for discrete-cosine transforming said original image;

electronic watermark data embedding means for embedding said electronic watermark data in the data which has been transformed by said discrete cosine transforming means;

data selecting means for selecting the direct output signal of said discrete cosine transforming means or the direct output signal of said electronic watermark data embedding means, and

a flip-flop connected to said data selecting means,

wherein said data selecting means selects the output signal of said discrete cosine transforming means or the output signal of said electronic watermark data embedding means corresponding to information stored in said flip-flop.

2. An image data encoding system for embedding electronic watermark data to an original image, which comprises:

discrete cosine transforming means for discrete-cosine transforming said original image;

electronic watermark data embedding means for embedding said electronic watermark data in the data which has been transformed by said discrete cosine transforming means;

data selecting means for selecting the direct output signal of said discrete cosine transforming means or the direct output signal of said electronic watermark data embedding means, and

wherein said data selecting means selects the output signal of said discrete cosine transforming means or the output signal of said electronic watermark data embedding means corresponding to an external signal.

3. An image data encoding system for embedding electronic watermark data to an original image, which comprises:

discrete cosine transforming unit for discrete-cosine transforming said original image;

electronic watermark data embedding unit for embedding said electronic watermark data in the data which has been transformed by said discrete cosine transforming unit;

data selecting unit for selecting the direct output signal of said discrete cosine transforming unit or the direct output signal of said electronic watermark data embedding unit, and

a flip-flop connected to said data selecting unit,

wherein said data selecting unit selects the output signal of said discrete cosine transforming unit or the output signal of said electronic watermark data embedding unit corresponding to information stored in said flip-flop.

4. An image data encoding system for embedding electronic watermark data to an original image, which comprises:

discrete cosine transforming unit for discrete-cosine transforming said original image;

electronic watermark data embedding unit for embedding said electronic watermark data in the data which has been transformed by said discrete cosine transforming unit;

data selecting unit for selecting the direct output signal of said discrete cosine transforming unit or the direct output signal of said electronic watermark data embedding unit, and

wherein said data selecting unit selects the output signal of said discrete cosine transforming unit or the output signal of said electronic watermark data embedding unit corresponding to an external signal.