# US 2019/0379899 A1 · Image coding device, image coding method, and image falsification identification program

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- Number: US 2019/0379899 A1
- Document ID: US20190379899A1
- Status: Published application
- Kind: A1
- Application number: 16/430,470
- Filed: 2019-06-04
- Published: 2019-12-12
- Earliest claimed: 2018-06-06
- Assignees: JVC KENWOOD Corporation
- Applicants: JVC KENWOOD Corporation
- Inventors: Takayuki SUGAHARA; Masaki GOTO
- Web page: https://patentgrep.com/patent/US20190379899A1

## CPC

- H04N 19/467: characterised by the embedded information being invisible, e.g. watermarking
- G06T 1/0042: {Fragile watermarking, e.g. so as to detect tampering}
- G06T 1/0085: {Time domain based watermarking, e.g. watermarks spread over several images}
- H04N 1/32277: {Compression}
- H04N 1/32331: {Fragile embedding or watermarking}
- H04N 19/109: among a plurality of temporal predictive coding modes
- H04N 19/124: Quantisation
- H04N 19/137: Motion inside a coding unit, e.g. average field, frame or block difference
- H04N 19/167: Position within a video image, e.g. region of interest [ROI]
- H04N 19/176: the region being a block, e.g. a macroblock
- G06T 2201/0053: Embedding of the watermark in the coding stream, possibly without decoding; Embedding of the watermark in the compressed domain
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

An image coding device adapted to code time-continuous pictures is provided. An embedding position information conversion unit acquires embedding position information indicating a position in a picture, by using a one-way function based on time-continuous information. An image coding unit selects a coding block in the picture based on the embedding position information, embeds electronic watermark information in a coding parameter used to code the coding block, and codes the coding block by using the coding parameter in which the electronic watermark information is embedded.

## Claims

### Claim 1

An image coding device adapted to code time-continuous pictures, comprising:
an embedding position information conversion unit that acquires embedding position information indicating a position in a picture, by using a one-way function based on time-continuous information; and
an image coding unit that selects a coding block in the picture based on the embedding position information, embeds electronic watermark information in a coding parameter used to code the coding block, and codes the coding block by using the coding parameter in which the electronic watermark information is embedded.

### Claim 2 (depends on 1)

The image coding device according to claim 1, wherein
in the case the coding parameter in which the electronic watermark information is embedded is information related to a motion vector, the coding unit mandatorily sets a mode in which a motion vector is used, in a coding block coded by the coding parameter in which the electronic watermark information is embedded.

### Claim 3 (depends on 1)

The image coding device according to claim 1, wherein
in the case the coding parameter in which the electronic watermark information is embedded is information related to quantization, the coding unit mandatorily sets a mode in which a quantization parameter is recorded, in a coding block coded by the coding parameter in which the electronic watermark information is embedded.

### Claim 4 (depends on 1)

The image coding device according to claim 1, wherein
the picture is an image captured by a vehicle-mounted camera, and the electronic watermark information includes at least one of information related to the vehicle-mounted camera, information related to the automobile in which the vehicle-mounted camera is provided, and information related to an owner of the vehicle-mounted camera.

### Claim 5

An image coding method adapted to code time-continuous pictures, comprising:
acquiring an embedding position information conversion unit indicating a position in a picture, by using a one-way function based on time-continuous information;
selecting a coding block in the picture based on the embedding position information, embedding electronic watermark information in a coding parameter used to code the coding block, and coding the coding block by using the coding parameter in which the electronic watermark information is embedded.

### Claim 6

A recording medium encoded with an image falsification identification program adapted to decode a picture from a coded bitstream in which time-continuous pictures are coded and detect electronic watermark information, and to identify whether falsification has been made, the image falsification identification program comprising computer-implemented modules including:
an embedding position information conversion module that acquires embedding position information indicating a position in a picture, by using a one-way function based on time-continuous information acquired from the picture;
an electronic watermark information extraction module that selects a coding block in the picture based on the embedding position information and extracts the electronic watermark information from a coding parameter used to code the coding block; and
a comparison and determination module that determines whether the picture has been falsified by comparing the extracted electronic watermark information with reference information.