H04N 2201/327
Which are undetectable to the naked eye
Official title: which are undetectable to the naked eye, e.g. embedded codes
H04N2201/327 (Which are undetectable to the naked eye) appears on 1,426 US grants and 1,247 published applications in this corpus.
Search patents in H04N- Granted patents
- 1,426
- Published applications
- 1,247
- Assignees
- 214
- Inventors
- 1,145
- Latest grant
- 2 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 9 | 0 |
| 1997 | 17 | 0 |
| 1998 | 25 | 0 |
| 1999 | 23 | 0 |
| 2000 | 32 | 0 |
| 2001 | 41 | 33 |
| 2002 | 50 | 106 |
| 2003 | 73 | 135 |
| 2004 | 107 | 86 |
| 2005 | 71 | 164 |
| 2006 | 128 | 83 |
| 2007 | 98 | 83 |
| 2008 | 102 | 118 |
| 2009 | 97 | 112 |
| 2010 | 109 | 99 |
| 2011 | 154 | 67 |
| 2012 | 90 | 43 |
| 2013 | 46 | 23 |
| 2014 | 40 | 18 |
| 2015 | 31 | 24 |
| 2016 | 19 | 21 |
| 2017 | 18 | 9 |
| 2018 | 11 | 6 |
| 2019 | 8 | 4 |
| 2020 | 2 | 2 |
| 2021 | 3 | 1 |
| 2022 | 2 | 4 |
| 2023 | 2 | 5 |
| 2024 | 4 | 0 |
| 2025 | 2 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Encoding signals with fluorescing inks24 Jun 2025US 12,337,609 B1Digimarc Corporation
- Printing system for performing visible and invisible printing, terminal apparatus for the printing system, and non-transitory computer-executable medium for the printing system5 Nov 2024US 12,137,193 B2Ricoh Company, Ltd.
- Image processing apparatus and image processing method capable of generating 2D barcode using words constituting text in document image, input identification information, and predetermined sign and assigning generated 2D barcode to document image9 Jul 2024US 12,033,012 B2KYOCERA Document Solutions Inc.
- Methods and systems for automatically identifying IR security marks based on known halftone frequency and color information26 Mar 2024US 11,941,937 B2Xerox Corporation
- Information processing apparatus and image forming apparatus30 Apr 2026US 2026/0119829 A1Ricoh Company, Ltd.
- Image capturing apparatus capable of suppressing detection of subject not intended by user, control method for image capturing apparatus, and storage medium18 May 2023US 2023/0154148 A1Canon Kabushiki Kaisha
- Printing system, terminal apparatus, and non-transitory computer-executable medium11 May 2023US 2023/0148080 A1Ricoh Company, Ltd.
- Image processing apparatus and image processing method4 May 2023US 2023/0139830 A1Canon Kabushiki Kaisha
- Methods and systems for automatically identifying ir security marks based on known halftone frequency and color information2 Feb 2023US 2023/0030524 A1Xerox Corporation
Most cited
By later US patents
- Methods for surveying dissemination of proprietary empirical data1,132US 5,862,260 ADigimarc Corporation · 1999
- Computer system linked by using information in data objects1,131US 6,122,403 ADigimarc Corporation · 2000
- Linking of computers based on optical sensing of digital data942US 6,311,214 B1Digimarc Corporation · 2001
- Watermark embedder and reader942US 6,614,914 B1Digimarc Corporation · 2003
- Connected audio and other media objects859US 6,505,160 B1Digimarc Corporation · 2003