Patents
US 11100618 B2: Systems and methods for reducing low-frequency non-uniformity in images
- Granted
- 2021-08-24
- Filed
- 2019-09-11 application 16568139
- Type
- Utility · 20 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
Various techniques are disclosed for separating and removing low-frequency shadow or shading (also referred to herein as “non-uniformity”) from images that have been corrupted by the non-uniformity. A non-uniformity estimate that approximates the non-uniformity effect on the corrupted image may be generated by iteratively adding new blotches of non-uniformity data represented by two-dimensional (2D) functions, such as 2D Gaussian functions, to the non-uniformity estimate and applying filters to smoothen the 2D functions. In each iteration of the non-uniformity estimate generation process, a new non-uniformity update candidate that minimizes a cost function is identified. The corrupted image is processed based on the non-uniformity estimate to generate a corrected image.
Source: PVGPATDIS, file of 2026-04-10 (ipg210824.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| FLIR Systems, Inc. 370 patents | US company or organization | Wilsonville, OR | FLIR SYSTEMS INC Form D issuer EXACT high confidence: identical full name and state FLIR SYSTEMS INC SEC filer EXACT medium confidence: identical full name, one of each nationally | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Enrique Sanchez-Monge | Tampere, FI | 6 | PVGPATDIS, file of 2026-04-10 | |
| Alessandro Foi | Tampere, FI | 11 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| G06T | Image data processing or generation, in general | G06T5/94 | PVGPATDIS, file of 2026-04-10 |
| H04N | Pictorial communication, e.g. television | H04N25/61 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2021-11-24 | Merger Merger and change of name | FLIR SYSTEMS, INC. signed 2021-05-14 FIREWORK MERGER SUB II, LLC signed 2021-05-14 | TELEDYNE FLIR, LLC THOUSAND OAKS, CA | 58250/300 | PASDL, file of 2026-10-15 |
| 2019-12-24 | Assignment Assignment of assignor's interest | NOISELESS IMAGING OY LTD. signed 2019-11-12 | FLIR SYSTEMS, INC. WILSONVILLE, OR | 51363/25 | ECORSEXC, file of 2026-09-25 |
| 2019-09-17 | Assignment Assignment of assignor's interest | FOI, ALESSANDRO signed 2017-03-17 SANCHEZ-MONGE, ENRIQUE signed 2017-03-17 | FLIR SYSTEMS, INC. WILSONVILLE, OR NOISELESS IMAGING OY LTD. TAMPERE | 50407/95 | ECORSEXC, file of 2026-09-25 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.