Data processing apparatus and method and storage medium

• US 6,449,378 B1
• Filed: 01/22/1999
• Issued: 09/10/2002
• Est. Priority Date: 01/30/1998
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Iwamura, Keiichi, Yoshida, Jun, Nagasawa, Kenichi
• Primary Examiner(s): Johns, Andrew W.
• Assistant Examiner(s): NAKHJAVAN, SHERVIN K
• Application Number:
  US09/235,390
• Time in Patent Office: 1,327 Days
• Field of Search: 382/100, 382/232, 382/235, 382/236, 382/276, 382/280, 382/282, 713/168, 713/176, 713/179, 713/180, 340/825.34
• US Class Current: 382/100
• CPC Class Codes: G06T 1/0085 Time domain based watermarking, e.g. watermarks spread over several images
• CPC Class Codes: G06T 2201/0052 Embedding of the watermark in the frequency domain

Abstract

It is an object of this invention to reliably pad electronic water-mark information even in a moving image constituted by a plurality of frames whose contents hardly change and easily pad electronic water-mark information even in a general moving image obtained by photographing an object at one angle. In order to achieve this object, there is provided an electronic water-mark information padding scheme of padding electronic water-mark information in only intraframe-encoded data without padding any electronic water-mark information in interframe-encoded data.

Claims

1. An image processing method, comprising the steps of:

an encoding step of encoding image data constituting a moving image, by selectively using intraframe encoding or interframe encoding, wherein said encoding step performs at least frequency conversion processing and variable-length encoding; and

an embedding step of embedding a digital watermark in only the image data to be intraframe-encoded, the embedding being performed before the frequency processing is performed in the encoding step,

wherein, the digital watermark is not embedded in the image data to be interframe-encoded.

2. A method according to claim 1 further comprising an encrypting step of encrypting the image data encoded by intraframe encoding.

3. An image processing method, comprising the steps of:

an encoding step of encoding image data constituting a moving image, by selectively using intraframe encoding or interframe encoding, wherein said encoding step performs at least frequency conversion processing and variable-length encoding processing; and

an embedding step of embedding a digital watermark in only the image data to be intraframe encoded, the embedding being performed during the encoding step in image data which has been subjected to the frequency conversion processing but which has not yet been subjected to the variable-length encoding processing,

wherein the digital watermark is not embedded in the image data to be interframe-encoded, and

wherein, the encoding in the encoding step and the embedding in the embedding step are executed without inverse variable-length encoding into each image data constituting the moving image.

4. A method according to claim 3 further comprising an encrypting step of encrypting the image data encoded by intraframe encoding.

5. An image processing apparatus, comprising:

encoding means for encoding image data constituting a moving image, by selectively using intraframe encoding or interframe encoding, the encoding means performing at least frequency conversion processing and variable-length encoding processing; and

embedding means for embedding a digital watermark in only the image data to be intraframe-encoded, the embedding being performed before frequency conversion processing is performed by the encoding means,

wherein, the digital watermark is not embedded in the image data to be interframe-encoded.

6. An image processing apparatus, comprising:

encoding means for encoding image data constituting a moving image, by selectively using intraframe encoding or interframe encoding, the encoding means performing at least frequency conversion processing and variable-length encoding processing; and

embedding means for embedding a digital watermark in only the image data to be intraframe-encoded, the embedding being performed during the encoding by the encoding means in image data which has been subjected to the frequency conversion processing but which has not yet been subjected to the variable-length encoding processing,

wherein, the digital watermark is not embedded in the image data to be interframe-encoded, and

wherein, the encoding by the encoding means and the embedding by the embedding means are executed without inverse variable-length encoding into each image data constituting the moving image.