H04N 3/23
Distortion correction
Official title: Distortion correction, e.g. for pincushion distortion correction, S-correction
H04N3/23 (Distortion correction) appears on 492 US grants and 64 published applications in this corpus.
Search patents in H04N- Granted patents
- 492
- Published applications
- 64
- Assignees
- 125
- Inventors
- 630
- Latest grant
- 22 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 21 | 0 |
| 1977 | 8 | 0 |
| 1978 | 12 | 0 |
| 1979 | 10 | 0 |
| 1980 | 11 | 0 |
| 1981 | 6 | 0 |
| 1982 | 7 | 0 |
| 1983 | 6 | 0 |
| 1984 | 10 | 0 |
| 1985 | 11 | 0 |
| 1986 | 10 | 0 |
| 1987 | 25 | 0 |
| 1988 | 20 | 0 |
| 1989 | 14 | 0 |
| 1990 | 17 | 0 |
| 1991 | 14 | 0 |
| 1992 | 9 | 0 |
| 1993 | 16 | 0 |
| 1994 | 22 | 0 |
| 1995 | 27 | 0 |
| 1996 | 21 | 0 |
| 1997 | 16 | 0 |
| 1998 | 21 | 0 |
| 1999 | 29 | 0 |
| 2000 | 19 | 0 |
| 2001 | 34 | 7 |
| 2002 | 21 | 11 |
| 2003 | 11 | 8 |
| 2004 | 8 | 3 |
| 2005 | 3 | 7 |
| 2006 | 8 | 6 |
| 2007 | 6 | 5 |
| 2008 | 0 | 1 |
| 2009 | 1 | 2 |
| 2010 | 2 | 0 |
| 2011 | 2 | 2 |
| 2012 | 1 | 1 |
| 2013 | 2 | 2 |
| 2014 | 1 | 3 |
| 2015 | 2 | 1 |
| 2016 | 3 | 2 |
| 2017 | 2 | 0 |
| 2018 | 1 | 1 |
| 2019 | 1 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Method to compensate for projection errors when outputting images, system having an arithmetic logic unit for carrying out the method and computer program22 Apr 2025US 12,284,459 B2Robert Bosch GmbH
- Image projection apparatus12 Mar 2019US 10,230,930 B2Ricoh Company, Ltd.
- Image displaying system10 Apr 2018US 9,939,895 B2Shanghai AVIC OPTO Electronics Co., Ltd.
- 2-D straight-scan on imaging surface with a raster polygon13 Jun 2017US 9,676,206 B2Prysm, Inc.
- Image projection apparatus and control method thereof14 Feb 2017US 9,568,812 B2Canon Kabushiki Kaisha
- Method to compensate for projection errors when outputting images, system having an arithmetic logic unit for carrying out the method and computer program15 Feb 2024US 2024/0056548 A1Robert Bosch GmbH
- Projector and method for controlling projector25 Apr 2019US 2019/0124309 A1Seiko Epson Corporation
- Image projection apparatus24 May 2018US 2018/0146179 A1Ricoh Company, Ltd.
- Image displaying system29 Dec 2016US 2016/0379345 A1Shanghai AVIC OPTO Electronics Co., Ltd.
- 2-d straight-scan on imaging surface with a raster polygon8 Dec 2016US 2016/0355024 A1Prysm, Inc.
Most cited
By later US patents
- Picture processing apparatus257US 4,549,208 AHitachi, Ltd. · 1985
- Display system having wide field of view257US 4,772,942 APilkington P. E. Limited · 1988
- Screw and driver235US 5,217,462 APfizer Hospital Products Group, Inc. · 1993
- Process and device for image display with automatic defect correction by feedback104US 5,091,773 AThomson-CSF · 1992
- Method and apparatus for preventing keystone distortion104US 6,367,933 B1Macronix International Co., Ltd. · 2002