Visual vehicle parking occupancy sensor
AssigneeAnalog Devices Glibal
InventorRaka Singh
Life of this patent
Estimating the term…
Abstract
System and techniques for a visual vehicle parking occupancy sensor are described herein. A color image, including a parking space, is received from a camera. A cascaded search for vehicle features in a hue-saturation-value (HSV) converted version of the color image is performed to produce search results. A search for macro vehicle features in the color image is also performed to produce an indication of found macro vehicle features when the search results are of a first type. An occupancy indicator is provided based on the search results when the search results are of a second type and based on the indication otherwise.
Claims24
A device comprising:
- a camera interface to receive a color image from a camera, the image including a parking space;
- an HSV feature extractor to perform a cascaded search for vehicle features in a hue-saturation-value (HSV) encoded image corresponding to the color image, and return search results, wherein to perform the cascaded search, the HSV feature extractor is to search for a set of first vehicle features and proceed to search for a different second vehicle feature when a threshold number of the first vehicle features are not found;
- a classifier to perform a search for macro vehicle features in the color image and return an indication of found macro vehicle features;
- and
- a controller to:
- invoke the HSV feature extractor on an HSV converted version of the color image to produce the search results;
- modify a classifier confidence score for the classifier based on a confidence score of the cascaded search;
- invoke the classifier on the color image using the modified classifier confidence score to produce the indication, when the search results are of a first type;
- and
- output an occupancy indicator based on the search results when the search results are of a second type, wherein the search results are of the first type when the confidence score of the cascaded search is below a threshold level, and of the second type when the confidence score of the cascaded search is at or above the threshold level.
A at least one non-transitory machine-readable medium including instructions that, when executed by a machine, cause the machine to perform operations comprising:
- receiving a color image from a camera, the image including a parking space;
- performing a cascaded search for a plurality of vehicle features in a hue-saturation-value (HSV) converted version of the color image to produce search results, wherein performing the cascaded search includes a search for a set of first vehicle features of the plurality of vehicle features, and proceeding to search for a second different vehicle feature of the plurality of vehicle features when a threshold number of the first vehicle features are not found;
- modifying a confidence score of a classifier based on a confidence score of the cascaded search;
- performing a search for macro vehicle features in the color image using the classifier with the modified confidence score, to produce an indication of found macro vehicle features when the search results are of a first type;
- and
- outputting an occupancy indicator based on the search results when the search results are of a second type and based on the indication otherwise, wherein the search results are of the first type when the confidence score of the cascaded search is below a threshold level, and of the second type when the confidence score of the cascaded search is at or above the threshold level.
Dependencies are inferred from the claim text.