Hidefumi Ohsawa
34Patents
17h-index
20Co-inventors
77Inventor score
Filing activity: Dec 23, 1987 → Feb 26, 1999
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4878125A | Method and apparatus for image processing with fed-back error correction | Physics | 72 | Expired |
| US4975786A | Image processing method and apparatus with error diffusion capability | Electricity | 68 | Expired |
| US5818537A | Image processing method and apparatus for converting between data coded in different formats | Electricity | 56 | Expired |
| US4876610A | Image processing apparatus with binarization-error dispersal | Physics | 55 | Expired |
| US5790195A | Image processing apparatus | Electricity | 54 | Expired |
| US5883976A | Selectively utilizing multiple encoding methods | Electricity | 49 | Expired |
| US4926268A | Image processing apparatus which converts m-bit image data to n-bit (n>m) image data | Mechanical Engineering; Lighting; Heating | 48 | Expired |
| US4958238A | Image processing method and apparatus with conditional correction of error data | Electricity | 44 | Expired |
| US5008950A | Image processing method and apparatus for error-dispersion digitization without moire or spurious stripe formation | Electricity | 44 | Expired |
| US5126838A | Color image processing with undercolor removal suitable for use in digital processing | Electricity | 37 | Expired |
| US5124811A | Image encoding apparatus | Electricity | 30 | Expired |
| US5136396A | Image encoding method | Physics | 29 | Expired |
| US5325448A | Image treatment method and apparatus with error dispersion and controllable quantization | Electricity | 27 | Expired |
| US4958218A | Image processing method and apparatus with dot-processing | Electricity | 27 | Expired |
| US5903366A | Color image encoding method | Electricity | 26 | Expired |
| US5068746A | Image processing apparatus | Physics | 24 | Expired |
| US5875039A | Image processing method and apparatus | Physics | 23 | Expired |
| US6266449A | Information processing apparatus and method which selectively controls data encoding by monitoring amount of encoded data | Physics | 15 | Expired |
| US5991450A | Image encoding and decoding apparatus | Electricity | 15 | Expired |
| US5331426A | Image encoding method | Physics | 15 | Expired |
| US5655032A | Coding method and apparatus therefor | Electricity | 13 | Expired |
| US5917956A | Image processing apparatus capable of removing an edge portion from a multi-level color signal based on a binary color signal | Electricity | 12 | Expired |
| US6285464A | Apparatus and method for producing a half-tone image | Electricity | 12 | Expired |
| US5898461A | Image processing apparatus | Electricity | 11 | Expired |
| US4907076A | Color balance processing apparatus wherein color component signals are corrected through comparison with a reference value | Electricity | 10 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.