Image processing device, image processing method, program for executing image processing method, and storage medium for storing program
AssigneeCanon Kabushiki Kaisha
InventorsLing Lu, Kitahiro Kaneda
Life of this patent
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Abstract
To provide image processing device and method which can achieve embedding and extracting of watermark message which secures certain or more message embedding accuracy and amount as suppressing deterioration of quality in an original document image, it inputs a document image to an image input unit, it extracts by an image analysis unit a character image included in the input document image, and it embeds by an embedding unit watermark message by constituting the character image by means of a predetermined dot pattern.
Claims21
An image processing device comprising:
- an image input unit adapted to input a document image;
- an extraction unit adapted to extract a character image included in the input document image;
- and
- an embedding unit adapted to embed a watermark message by constituting the character image by means of a predetermined dot pattern.
An image processing device comprising:
- an image input unit adapted to input a watermarked document image;
- an acquisition unit adapted to acquire dot pattern information indicating a dot pattern constituting a character image included in the input document image;
- and
- an extraction unit adapted to extract a watermark message based on the acquired dot pattern information constituting a character image.
An image processing method comprising:
- an image input step of inputting a document image;
- an extraction step of extracting a character image included in the input document image;
- and
- an embedding step of embedding a watermark message by constituting the character image by means of a predetermined dot pattern.
An image processing method comprising:
- an image input step of inputting a watermarked document image;
- an acquisition step of acquiring dot pattern information indicating a dot pattern constituting a character image included in the input document image;
- and
- an extraction step of extracting a watermark message based on the acquired dot pattern information constituting the character image.
A control program for causing a computer to execute an image processing method comprising:
- an image input step of inputting a document image;
- an extraction step of extracting a character image included in the input document image;
- and
- an embedding step of embedding a watermark message by constituting the character image by means of a predetermined dot pattern.
A computer-readable storage medium which stores therein a control program for causing a computer to execute an image processing method comprising:
- an image input step of inputting a document image;
- an extraction step of extracting a character image included in the input document image;
- and
- an embedding step of embedding a watermark message by constituting the character image by means of a predetermined dot pattern.
A control program for causing a computer to execute an image processing method comprising:
- an image input step of inputting a watermarked document image;
- an acquisition step of acquiring dot pattern information indicating a dot pattern constituting a character image included in the input document image;
- and
- an extraction step of extracting a watermark message based on the acquired dot pattern information constituting the character image.
A computer-readable storage medium which stores therein a control program for causing a computer to execute an image processing method comprising:
- an image input step of inputting a watermarked document image;
- an acquisition step of acquiring dot pattern information indicating a dot pattern constituting a character image included in the input document image;
- and
- an extraction step of extracting a watermark message based on the acquired dot pattern information constituting the character image.
Dependencies are inferred from the claim text.