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Ambient correction in rolling image capture system

An image capture and ambient light technology, applied in the input/output process of data processing, instruments, calculations, etc., can solve problems such as the difficulty of image correction for ambient light in rolling image capture systems

Inactive Publication Date: 2014-12-10
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Further, the use of a rolling image capture system may introduce additional difficulties in correcting the image for ambient light

Method used

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  • Ambient correction in rolling image capture system
  • Ambient correction in rolling image capture system
  • Ambient correction in rolling image capture system

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Embodiment Construction

[0019] As mentioned above, ambient light sources, such as indoor lighting, sunlight, etc., can impair the performance of a vision-based touch detection system. The term "ambient light" is used herein to describe light emitted by a source other than the local light source that is part of the vision-based touch system, as described in more detail below. Even if a bandpass filter is used in front of the image sensor to block unwanted wavelengths of light from reaching the image sensor, ambient light in the wavelength range passed by the bandpass filter may still reach the image sensor. As one specific example, a vision system configured to detect touch by means of locally emitted infrared light reflected from an object in contact with the display screen may be affected by infrared light emitted by incandescent room lighting, sunlight, or the like. Ambient light of sufficient brightness may cause vision-based touch detection systems to falsely identify ambient light as a touch inp...

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Abstract

Embodiments are disclosed that relate to the correction of an image acquired in a rolling image capture system for ambient light. One embodiment provides a device comprising a screen, a rolling image capture system, a local light source, and a controller. The controller is configured to operate the local light source while acquiring first and second frames of image data to integrate each field of image sensor pixels for a duration of local+ambient light and for a duration of ambient light such that a sum tlocal+ambient+tambient for the first frame is different than a sum tlocal+ambient+tambient for the second frame for each field of pixels. The controller is further configured to determine an ambient light value, and to adjust one or more pixels based upon the ambient light value.

Description

Background technique [0001] Touch-sensitive devices can detect touch via a number of different mechanisms including, but not limited to, optical, resistive, and capacitive mechanisms. Some optical touch sensitive devices detect touch by capturing an image of the back of the touch screen by an image sensor and then processing the image to detect objects located on the screen. Such devices may include a light source inside the device to illuminate the back of the display screen so that objects on the screen reflect incident light to the image sensor, allowing the objects to be detected. [0002] One difficulty that optical touch screen devices may encounter is distinguishing between external (ambient) light and light reflected from light sources within the device. Ambient light of sufficient brightness may be mistaken for an object touching the device and thus may degrade the performance of the device. Further, the use of a rolling image capture system may introduce additional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042G06F3/038
CPCG06F3/0383G06F3/0425G06F3/0304G06F3/0416
Inventor N.基姆
Owner MICROSOFT TECH LICENSING LLC