Claims
- 1. An image processing apparatus comprising:an input unit, said input unit inputting an image to which first additional information is added by a first addition method so that it is difficult to discriminate by human eyes and to which second additional information is added by a second addition method so that it is difficult to discriminate by human eyes; and an extraction unit, said extraction unit extracting from the image the first additional information according to a first extraction method corresponding to the first addition method and extracting from the image the second additional information according to a second extraction method corresponding to the second addition method, wherein the second extraction method is specified by the first additional information.
- 2. An apparatus according to claim 1, wherein the first extraction method and the second extraction method are different.
- 3. An apparatus according to claim 1, wherein the first extraction method and the second extraction method are the same.
- 4. An apparatus according to claim 1, wherein the first additional information is a manufacturer ID of said image processing apparatus.
- 5. An apparatus according to claim 1, wherein the first additional information is an equipment number or product name of said image processing apparatus.
- 6. An apparatus according to claim 1, wherein the first additional information is a pattern composed of plural dots.
- 7. An apparatus according to claim 1, wherein the second additional information is a pattern composed of plural dots.
- 8. An apparatus according to claim 1, wherein the first additional information is periodically added to the input image.
- 9. An image processing method comprising the steps of:inputting an image to which first additional information is added by a first addition method so that it is difficult to discriminate by human eyes and to which second additional information is added by a second addition method so that it is difficult to discriminate by human eyes; and extracting from the image the first additional information according to a first extraction method corresponding to the first addition method and extracting from the image the second additional information according to a second extraction method corresponding to the second addition method, wherein the second extraction method is specified by the first additional information.
- 10. A computer-executable image processing program comprising program codes for controlling an image processing apparatus to perform the steps of:inputting an image to which first additional information is added by a first addition method so that it is difficult to discriminate by human eyes and to which second additional information is added by a second addition method so that it is difficult to discriminate by human eyes; and extracting from the image the first additional information according to a first extraction method corresponding to the first addition method and extracting from the image the second additional information according to a second extraction method corresponding to the second addition method, wherein the second extraction method is specified by the first additional information.
Priority Claims (2)
Number |
Date |
Country |
Kind |
9-189743 |
Jul 1997 |
JP |
|
9-189744 |
Jul 1997 |
JP |
|
Parent Case Info
This application is a divisional of application Ser. No. 09/721,698, filed Nov. 27, 2000 now U.S. Pat. No. 6,411,402.
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