Warning device for judging whether occupant is visually distracted
US-9221386-B2 · Dec 29, 2015 · US
Eyelid detection device, eyelid detection method, and recording medium
US9020199B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9020199-B2 |
| Application number | US-201114112461-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 19, 2011 |
| Priority date | Apr 19, 2011 |
| Publication date | Apr 28, 2015 |
| Grant date | Apr 28, 2015 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A secondary curve, the ends of which coincide with the inner corner and the outer corner of the eye, is determined successively, and the total of the edge values of the pixels overlapping the secondary curve is calculated as an evaluation value. Next, a characteristic curve is generated on the basis of data made up of the calculated evaluation value and the Y-coordinate of the intersection between the secondary curve and a straight line passing through the center of a line segment whose ends coincide with the inner corner and the outer corner of the eye. Then, the reference positions for the upper eyelid and the lower eyelid of the eye are set on the basis of the result of an attempt to detect a pixel group occurring because of the red-eye effect in a search area defined on the basis of peaks in the characteristic curve.
First claim
Opening claim text (preview).
The invention claimed is: 1. An eyelid detection device comprising: a edge value calculator that calculates edge values for pixels constituting an image depicting a driver's eye; a evaluation value calculator that successively defines a fitting curve, one end of which coincides with an inner corner of the eye depicted in the image, and the other end of which coincides with an outer corner of the eye depicted in the image, and calculates an evaluation value indicating a degree to…
Assignees
Inventors
Classifications
- G06K9/00845Primary
Physics · mapped topic
Physics · mapped topic
- G06V20/597Primary
Physics · mapped topic
- G06V40/193Primary
Physics · mapped topic
Patent family
Related publications grouped by family.
External sources
Next steps
Free tools are coming soon. Tell us what you want to track and we'll notify you.
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US9020199B2 cover?
- A secondary curve, the ends of which coincide with the inner corner and the outer corner of the eye, is determined successively, and the total of the edge values of the pixels overlapping the secondary curve is calculated as an evaluation value. Next, a characteristic curve is generated on the basis of data made up of the calculated evaluation value and the Y-coordinate of the intersection betw…
- Who is the assignee on this patent?
- Hiramaki Takashi, Nakabayashi Atsushi, Usami Masayuki, and 4 more
- What technology area does this patent fall under?
- Primary CPC classification G06K9/00845. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Apr 28 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).