Video Steganography or Encoding

• US 20070223592A1
• Filed: 05/22/2007
• Published: 09/27/2007
• Est. Priority Date: 10/21/1994
• Status: Active Grant

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Rhoads, Geoffrey
• Granted Patent: US 7,676,059 B2
• Time in Patent Office: Days
• US Class Current: 375/240.240
• CPC Class Codes: G06T 1/005 Robust watermarking, e.g. average attack or collusion attack resistant
• CPC Class Codes: G06T 2201/0065 Extraction of an embedded watermark; Reliable detection

Abstract

The present invention relates generally to encoding data in video. One form of encoding is steganographic encoding. In one implementation a method is provided to encode video. The video includes a plurality of samples. The method includes: obtaining an N-bit data string to be encoded into the video, where N is at least two, the string including bits having a value of “1” or “0”; for a first bit in the N-bit string: if the bit comprises a “1” value, making a corresponding change to the video to represent the “1”value in the video, the change being essentially unnoticeable to a human viewer of the video, but if the first bit comprises a “0” value, making no corresponding change to the video; performing the aforesaid act for the second through Nth bits of the N-bit string. Of course, other combinations are provided as well.

Claims

1. A method of encoding video, the video comprising a plurality of samples, the method comprising:

obtaining an N-bit data string to be encoded into the video, where N is at least two, the string including bits having a value of “

1”

or “

0”

;

for a first bit in the N-bit string;

if the bit comprises a “

1”

value, making a corresponding change to the video to represent the “

1”

value in the video, the change being essentially unnoticeable to a human viewer of the video, but if the first bit comprises a “

0”

value, making no corresponding change to the video;

performing the aforesaid act for the second through Nth bits of the N-bit string.

2. The method of claim 1 wherein said making a corresponding change to the video to represent the “

1”

value in the video changes one or more of the plurality of samples.

3. The method of claim 2 wherein the samples comprise pixels or pixel values.

4. The method of claim 2 wherein the samples comprise video frames.

5. Encoded video stored on or in a medium, said encoded video comprising a plurality of samples, the encoded video comprising:

an N-bit data string encoded therein, where N is at least two, the string including bits having a value of “

1”

or “

0”

;

the encoding comprising, for a first bit in the N-bit string, if the bit comprises a “

1”

value, making a corresponding change to the video to represent the “

1”

value in the video, the change being essentially unnoticeable to a human viewer of the video, but if the first bit comprises a “

0”

value, making no corresponding change to the video, where each of the N-bits in the N-bit string are encoded in the same manner.

6. A method comprising:

obtaining encoded video, the encoded video comprising an N-bit data string encoded therein, where N is at least two, the string including bits having a value of “

1”

or “

0”

, the encoding comprising, for a first bit in the N-bit string, if the bit comprises a “

1”

value, making a corresponding change to the video to represent the “

1”

value in the video, the change being essentially unnoticeable to a human viewer of the video, but if the first bit comprises a “

0”

value, making no corresponding change to the video, where each of the N-bits in the N-bit string are encoded in the same manner; and

rendering the encoded video.

7. The method of claim 6 wherein said making a corresponding change to the video to represent the “

1”

value in the video changes one or more of the plurality of samples.

8. The method of claim 6 wherein the samples comprise pixels or pixel values.

9. A method comprising:

obtaining encoded video, the encoded video comprising an N-bit data string encoded therein, where N is at least two, the string including bits having a value of “

1”

or “

0”

, the encoding comprising, for a first bit in the N-bit string, if the bit comprises a “

1”

value, making a corresponding change to the video to represent the “

1”

value in the video, the change being essentially unnoticeable to a human viewer of the video, but if the first bit comprises a “

0”

value, making no corresponding change to the video, where each of the N-bits in the N-bit string are encoded in the same manner; and

analyzing the encoded video to obtain the N-bit data string.

10. The method of claim 9 wherein said making a corresponding change to the video to represent the “

1”

value in the video changes one or more of the plurality of samples.

11. The method of claim 9 wherein the samples comprise pixels or pixel values.