MODIFYING PARAMETERS OF AN OBJECT DETECTOR BASED ON DETECTION INFORMATION

• US 20090245580A1
• Filed: 04/02/2009
• Published: 10/01/2009
• Est. Priority Date: 07/21/2006
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Greig, Darryl
• Application Number:
  US12/417,244
• Publication Number:
  US 20090245580A1
• Time in Patent Office: Days
• US Class Current: 382/103
• CPC Class Codes: G01C 11/04 Interpretation of pictures
• CPC Class Codes: G06T 7/238 using non-full search, e.g. three-step search

Abstract

Embodiments of an object detection unit configured to modify parameters for one or more object detectors based on detection information are provided.

Claims

1. A method performed by a processing system, the method comprising:

running a first object detector on a first image frame with a first set of parameters to generate first detection information;

modifying the first set of parameters of the first object detector in response to the first detection information; and

subsequent to modifying the first set of parameters, running the first object detector with the first set of parameters on a second image frame.

2. The method of claim 1 further comprising:

modifying the first set of parameters to modify an amount of searching by the first object detector in response to the first detection information.

3. The method of claim 1 further comprising:

running a second object detector on the first image frame with a second set of parameters to generate second detection information;

modifying the second set of parameters of the second object detector in response to the second detection information; and

subsequent to modifying the second set of parameters, running the second object detector with the second set of parameters on the second image frame.

4. The method of claim 1 further comprising:

detecting a first object in the first image frame with the first object detector; and

storing the first set of parameters and an indication of the first object in the first detection information.

5. The method of claim 1 further comprising:

modifying a frequency of use of the first object detector in response to the first detection information.

6. The method of claim 1 further comprising:

modifying a sampling grid of the first object detector in response to the first detection information.

7. The method of claim 1 further comprising:

modifying a set of object scales of the first object detector in response to the first detection information.

8. The method of claim 1 further comprising:

modifying a set of search locations of the first object detector in response to the first detection information.

9. The method of claim 1 further comprising:

ensuring that the first set of parameters are configured to remain within a processing constraint.

10. A system comprising:

a memory including an object detection unit with a first object detector, a video stream, and detection information; and

a processor configured to execute the object detection unit to;

access first detection information that identifies a first set of objects detected in a first portion of a video stream by a first object detector with a first set of parameters;

modify the first set of parameters using the first detection information; and

subsequent to modifying the first set of parameters, run the first object detector with the first set of parameters on a second portion of the video stream that is subsequent to the first portion.

11. The system of claim 10, wherein the processor is configured to execute the object detection unit to:

determine a likelihood of detecting the first set of objects in the second portion of the video stream with the first object detector from the first detection information; and

modify the first set of parameters in response to the likelihood.

12. The system of claim 11, wherein the processor is configured to execute the object detection unit to:

increase an amount of searching by the first object detector in response to the likelihood being relatively high.

13. The system of claim 11, wherein the processor is configured to execute the object detection unit to:

decrease an amount of searching by the first object detector in response to the likelihood being relatively low.

14. The system of claim 10, wherein the processor is configured to execute the object detection unit to:

access second detection information that identifies a second set of objects detected in the first portion of the video stream by a second object detector with a second set of parameters;

modify the second set of parameters using the second detection information; and

subsequent to modifying the second set of parameters, run the second object detector with the second set of parameters on the second portion of the video stream that is subsequent to the first portion.

15. The system of claim 10, wherein the processor is configured to execute the object detection unit to:

determine processing constraint of the system; and

modify the first and the second sets of parameters to remain within the processing constraint.

16. A computer readable storage medium storing computer-executable instructions that, when executed in a scheduler of a process of a computer system, perform a method comprising:

detecting a processing constraint of the computer system; and

setting a first set of parameters of a first object detector to cause the first object detector to search for a first object in a video stream within the processing constraint.

17. The computer readable storage medium of claim 16, the method further comprising:

setting a second set of parameters of a second object detector to cause the second object detector to search for a second object in the video stream within the processing constraint.

18. The computer readable storage medium of claim 16, the method further comprising:

running the first object detector on a first portion of the video stream to generate detection information;

modifying the first set of parameters of the first object detector in response to the detection information and the processing constraint; and

subsequent to modifying the first set of parameters, running the first object detector with the first set of parameters on a second portion of the video stream.

19. The computer readable storage medium of claim 18, the method further comprising:

modifying the first set of parameters to modify an amount of searching by the first object detector in response to the detection information and the processing constraint.

20. The computer readable storage medium of claim 19, the method further comprising:

detecting a first object in the first portion with the first object detector; and

storing the first set of parameters and an indication of the first object in the detection information.