Electronic system

• US 9,092,063 B2
• Filed: 06/25/2013
• Issued: 07/28/2015
• Est. Priority Date: 09/14/2012
• Status: Active Grant

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: PixArt Imaging Incorporated
• Inventors: Kao, Ming Tsan, Yang, Shu Sian, Cheng, Han Ping
• Primary Examiner(s): Ahmed, Samir
• Assistant Examiner(s): YOUSSEF, MENATOLLAH M
• Application Number:
  US13/926,724
• Publication Number:
  US 20140079284A1
• Time in Patent Office: 763 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 3/017 Gesture based interaction, e.g. based on a set of recognized hand gestures interaction based on gestures traced on a digitiser G06F3/04883
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06F 3/0425 using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking a projected light spot to determine a position on a display surface G06F3/0386
• CPC Class Codes: G06V 40/28 Recognition of hand or arm movements, e.g. recognition of deaf sign language static hand signs G06V40/113

Abstract

An electronic system incorporates an image-sensing device and a processor coupled with the image-sensing device. The image-sensing device includes an image-sensing area configured to generate a picture. The picture includes a noisy region. The processor is configured to select a tracking region from the portion of the picture outside of the noisy region. The tracking region corresponds to an operative region of the image sensing area.

Claims

1. An electronic system comprising:

an image-sensing device comprising an image-sensing area that generates a picture comprising a noisy region; and

a processor coupled with the image-sensing device, configured to select a tracking region from the portion of the picture outside the noisy region, wherein the tracking region corresponds to an operative region of the image-sensing area, wherein the tracking region is an intersection region of a first region and a second region, wherein the first region comprises a plurality of successive rows of pixels, which do not include any pixel of the noisy region, and the second region comprises a plurality of successive columns of pixels, which do not include any pixel of the noisy region.

2. The electronic system of claim 1, comprising a screen, wherein the processor is configured to determine mapping data between the screen and the operative region.

3. The electronic system of claim 1, wherein an edge of the tracking region is adjacent to or passes through a boundary pixel of the noisy region.

4. The electronic system of claim 1, wherein the processor is configured to determine coordinate data of boundary pixels of the noisy region and to determine the tracking region using the coordinate data of the boundary pixels.

5. The electronic system of claim 1, wherein the processor is configured to use a characteristic value of the tracking region to determine whether to output coordinate data.

6. The electronic system of claim 1, further comprising a lighting device, wherein the processor is configured to subtract a second picture from a first picture when a characteristic value of the tracking region is less than a threshold, wherein the first picture comprises a dark image of an object taken when the lighting device is turned off, and the second picture comprises a bright image of the object taken when the object is illuminated by the lighting device.

7. The electronic system of claim 1, further comprising a lighting device configured to emit intermittent light, which allows an object to alternatively form bright images in a plurality of successive pictures.

8. The electronic system of claim 7, wherein the noisy region occurs in each picture of the plurality of successive pictures.

9. An electronic system comprising:

an image-sensing device generating a picture comprising a noisy region; and

a processor coupled with the image-sensing device, wherein the processor is configured to determine an edge of the noisy region, a portion of the picture outside the noisy region by the edge of the noisy region and a plurality of tracking regions from the portion of the picture, and to select a tracking region with a maximum area from the plurality of tracking regions.

10. The electronic system of claim 9, further comprising a screen, wherein the processor is configured to determine mapping data between the screen and the tracking region with a maximum area.

11. The electronic system of claim 9, wherein an edge of the tracking region with a maximum area is adjacent to or passes through a boundary pixel of the noisy region.

12. The electronic system of claim 9, wherein the processor is configured to use a characteristic value of the tracking region with a maximum area to determine whether to output coordinate data.

13. The electronic system of claim 9, further comprising a lighting device, wherein the processor is configured to subtract a second picture from a first picture when a characteristic value of the tracking region with a maximum area is less than a threshold, wherein the first picture comprises a dark image of an object taken when the lighting device is turned off, and the second picture comprises a bright image of the object taken when the object is illuminated by the lighting device.

14. The electronic system of claim 9, further comprising a lighting device configured to emit intermittent light, which allows an object to alternatively form bright images in a plurality of successive pictures.

15. The electronic system of claim 14, wherein the noisy region occurs in each picture of the plurality of successive pictures.

16. The electronic system of claim 9, further comprising a screen, wherein the tracking region with a maximum area is a rectangular tracking region that can be determined from the portion of the picture outside of the noisy region.