H04N 1/40
Picture signal circuits
Official title: Picture signal circuits (H04N1/387 takes precedence)
H04N1/40 (Picture signal circuits) appears on 11,533 US grants and 7,708 published applications in this corpus.
Search patents in H04N- Granted patents
- 11,533
- Published applications
- 7,708
- Assignees
- 1,373
- Inventors
- 12,379
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 18 | 0 |
| 1977 | 24 | 0 |
| 1978 | 27 | 0 |
| 1979 | 20 | 0 |
| 1980 | 34 | 0 |
| 1981 | 48 | 0 |
| 1982 | 49 | 0 |
| 1983 | 72 | 0 |
| 1984 | 75 | 0 |
| 1985 | 102 | 0 |
| 1986 | 94 | 0 |
| 1987 | 198 | 0 |
| 1988 | 166 | 0 |
| 1989 | 193 | 0 |
| 1990 | 205 | 0 |
| 1991 | 188 | 0 |
| 1992 | 195 | 0 |
| 1993 | 244 | 0 |
| 1994 | 260 | 0 |
| 1995 | 219 | 0 |
| 1996 | 255 | 0 |
| 1997 | 250 | 0 |
| 1998 | 407 | 0 |
| 1999 | 307 | 0 |
| 2000 | 316 | 0 |
| 2001 | 311 | 131 |
| 2002 | 244 | 381 |
| 2003 | 254 | 373 |
| 2004 | 290 | 458 |
| 2005 | 227 | 523 |
| 2006 | 411 | 518 |
| 2007 | 385 | 459 |
| 2008 | 383 | 426 |
| 2009 | 360 | 436 |
| 2010 | 378 | 404 |
| 2011 | 390 | 345 |
| 2012 | 422 | 338 |
| 2013 | 463 | 333 |
| 2014 | 486 | 268 |
| 2015 | 400 | 304 |
| 2016 | 288 | 237 |
| 2017 | 261 | 333 |
| 2018 | 266 | 329 |
| 2019 | 328 | 251 |
| 2020 | 293 | 204 |
| 2021 | 181 | 177 |
| 2022 | 167 | 159 |
| 2023 | 166 | 121 |
| 2024 | 109 | 92 |
| 2025 | 69 | 75 |
| 2026 | 35 | 33 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04N 1/405Halftoning, i.e. converting the picture signal of a continuous-tone original into a2,934
- H04N 1/407Control or modification of tonal gradation or of extreme levels2,435
- H04N 1/409Edge or detail enhancement2,006
- H04N 1/401Compensating positionally unequal response of the pick-up or reproducing head1,072
- H04N 1/40025Circuits exciting or modulating particular heads for reproducing continuous tone value scales957
- H04N 1/40062Discrimination between different image types777
- H04N 1/40056Circuits for driving or energising particular reading heads or original illumination means615
- H04N 1/40068Modification of image resolution, i.e. determining the values of picture elements at510
All 15 subgroupsShow fewer
- H04N 1/40087Multi-toning, i.e. converting a continuous-tone signal for reproduction with more than two387
- H04N 1/40012Conversion of colour to monochrome359
- H04N 1/403Discrimination between the two tones in the picture signal of a two-tone306
- H04N 1/40075Descreening, i.e. converting a halftone signal into a corresponding continuous-tone signal253
- H04N 1/40006Compensating for the effects of ageing, i.e. changes over time180
- H04N 1/40093Modification of content of picture140
- H04N 1/40081Soft dot halftoning, i.e. producing halftone dots with gradual edges40
Recent patents
- Image processing apparatus and image processing method6 Oct 2026US 12,755,361 B2Sony Group Corporation
- Image forming apparatus and controlling method for the same29 Sep 2026US 12,750,451 B2Canon Kabushiki Kaisha
- Automated total nail care systems, devices and methods15 Sep 2026US 12,733,725 B210Beauty, Inc.
- Determination method and recovery method15 Sep 2026US 12,736,898 B2Canon Kabushiki Kaisha
- Method of generating multiplexed image for printing based on color values gamut-mapped to inside maximum volume hyperrectangle8 Sep 2026US 12,732,586 B2Centre National De La Recherche Scientifique
- Additive manufacturing process for producing chemical delivery devices using screening8 Oct 2026US 2026/0307336 A1Genesee Valley Innovations, LLC
- Reading apparatus, reading method, and storage medium8 Oct 2026US 2026/0313062 A1Canon Kabushiki Kaisha
- Image processing apparatus, image processing method, and storage medium8 Oct 2026US 2026/0313068 A1Canon Kabushiki Kaisha
- Feature detection edge enhancement mechanism10 Sep 2026US 2026/0268499 A1Ricoh Company, Ltd.
- Feature detection edge enhancement mechanism10 Sep 2026US 2026/0268500 A1Ricoh Company, Ltd.
Most cited
By later US patents
- Droplet generating method and apparatus thereof1,847US 4,463,359 ACanon Kabushiki Kaisha · 1984
- Ink jet recording method1,590US 4,345,262 ACanon Kabushiki Kaisha · 1982
- Optical scanning device and image forming apparatus1,019US 7,598,972 B2Ricoh Company, Ltd. · 2009
- Optical reader for classifying an image558US 7,413,127 B2Hand Held Products, Inc. · 2008
- Optical reader having an imager543US 8,528,818 B2Hand Held Products, Inc. · 2013