최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0118846 (2002-04-08) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 123 인용 특허 : 394 |
By printing documents and other objects with machine readable indicia, such as steganographic digital watermarks or barcodes, a great variety of document management functions can be enabled. The indicia can be added as part of the printing process (after document data has been output by an originati
By printing documents and other objects with machine readable indicia, such as steganographic digital watermarks or barcodes, a great variety of document management functions can be enabled. The indicia can be added as part of the printing process (after document data has been output by an originating application program), such as by printer driver software, by a Postscript engine in a printer, etc. The indicia can encode data about the document, or can encode an identifier that references a database record containing such data. By showing the printed document to a computer device with a suitable optical input device (e.g., a webcam), an electronic version of the document can be recalled for editing, or other responsive action can be taken.
By printing documents and other objects with machine readable indicia, such as steganographic digital watermarks or barcodes, a great variety of document management functions can be enabled. The indicia can be added as part of the printing process (after document data has been output by an originati
By printing documents and other objects with machine readable indicia, such as steganographic digital watermarks or barcodes, a great variety of document management functions can be enabled. The indicia can be added as part of the printing process (after document data has been output by an originating application program), such as by printer driver software, by a Postscript engine in a printer, etc. The indicia can encode data about the document, or can encode an identifier that references a database record containing such data. By showing the printed document to a computer device with a suitable optical input device (e.g., a webcam), an electronic version of the document can be recalled for editing, or other responsive action can be taken. of claim 6 wherein the watermark embedded in the multilevel pixel representation of the image includes a watermark orientation signal used to detect the watermark in an image after undergoing geometric distortion. 8. The method of claim 6 wherein the watermark in the multilevel pixel representation carries a message including a key specifying locations of the halftone watermark. 9. A method of decoding a halftone watermark from an image comprising: deriving a key from data embedded in the image; using the key to identify locations and values of a halftone watermark; and analyzing pixel values at the locations to determine whether the values at the locations correspond to the values specified by the key. 10. The method of claim 9 including: scanning a printed version of the image at a suitably high resolution to read halftone watermark dots embedded into the printed version of the image; and then performing the actions of claim 9. 11. The method of claim 9 wherein the key is derived from a watermark embedded in the image. 12. The method of claim 11 wherein the watermark from which the key is derived is embedded so as to survive printing and scanning. 13. The method of claim 11 including: detecting an orientation signal and using the orientation signal to determined orientation parameters of the watermark; and using the orientation parameters to read a message embedded in the watermark, the message including the key. 14. A computer readable medium having software for performing the method of claim 9. 15. A method of embedding a watermark in a halftone image comprising: computing a watermark image comprising an array of values corresponding to pixel locations in a halftone image; embedding the watermark image in the halftone image by using the values of the watermark image to modulate thresholds at the pixel locations, where the thresholds are used to convert multilevel pixel values in a multilevel per pixel image into halftone pixel values of the halftone image. 16. The method of claim 15 wherein the watermark image comprises an orientation watermark signal enabling a watermark decoder to compensate for rotation, scale and translation. 17. The method of claim 15 wherein the watermark image comprises a watermark message signal carrying a message of two or more symbols. 18. A computer readable medium on which is stored software for performing the method of claim 15. 19. A method of embedding a watermark in a halftone image comprising: computing a watermark image comprising an array of values corresponding to pixel locations in a target halftone image at a resolution; combining the array of values of the watermark image with corresponding multilevel pixel values of a multilevel per pixel image to create a watermarked multilevel per pixel image at the resolution of the target halftone image; and performing a halftone process to convert the watermarked multilevel per pixel image to a watermarked halftone image. 20. The method of claim 19 wherein combining comprises adding the array of values of the watermark image with the corresponding pixel values of the multilevel per pixel image. 21. The method of claim 19 wherein performing the halftone process includes performing an error diffusion process on the watermarked multilevel per pixel image. 22. The method of claim 19 wherein performing the halftone process includes performing an ordered dithering process on the watermarked multilevel per pixel image. 23. The method of claim 19 wherein the watermark image comprises an orientation watermark signal enabling a watermark decoder to compensate for rotation, scale and translation. 24. The method of claim 19 wherein the watermark image comprises a watermark message signal carrying a message of two or more symbols. 25. A computer readable medium on which is stored software for performing the method of claim 19. 26. A watermark decoder comprising: a watermark detector for analyzing portions of an image to de
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