Digital camera focus self-calibration
a digital camera and self-calibration technology, applied in the field of digital cameras, can solve the problems of inconsistency between specific profiles and thermal expansion and contraction, and is susceptible to thermal expansion and contraction
Inactive Publication Date: 2018-02-08
MICROSOFT TECH LICENSING LLC
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Benefits of technology
This patent describes a method for calibrating a digital camera using a portable electronic device with microphones. The microphones detect the first and second audio signals when the lens assembly reaches the ends of its travel range, and the digital-to-analog converter values are recorded. Based on these values, the current condition of the device and pre-stored lens assembly travel profiles, an appropriate lens assembly travel profile is accessed and revised to calibrate the camera. The technical effect is that this method provides a convenient and efficient way to calibrate a digital camera, regardless of its location or orientation.
Problems solved by technology
Many components, including lenses, are commonly made of plastic material and are susceptible to thermal expansion and contraction.
However, such a specific profile may not always correspond to actual use conditions.
Method used
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[0046]A. A method of focus calibration in a portable electronic device, the method comprising: receiving an input to activate a camera function of the portable electronic device; moving, by a drive mechanism, a lens assembly of the portable electronic device towards an end of a lens assembly travel; detecting an audio signal associated with the lens assembly reaching the end and recording an end value; and generating a lens assembly travel profile based at least in part on the end value, the lens assembly travel profile indicative of a lens assembly position for focusing.
[0047]B. A method as paragraph A recites, further comprising: activating, upon receiving the input to activate the camera function, one or more microphones of the portable electronic device to detect the audio signal.
[0048]C. A method as paragraph A or B recites, wherein, the value corresponds to an input value to the drive mechanism when the one or more microphones detect the audio signal.
[0049]D. A method as parag...
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Focus self-calibration for a digital camera may be performed by moving a lens assembly of the digital camera over its travel range, and detecting travel limits of the lens assembly based on audio signal generated by the lens assembly reaching ends of the travel range. Digital-to-analog converter values corresponding to the lens assembly at the ends of the travel range may be used to create a camera focus profile.
Description
BACKGROUND[0001]In addition to digital cameras, digital camera function is widely available as a built-in function for many portable electronic devices such as cellular phones, tablet computers, and laptop computers. These portable electronic devices are often taken with users and experience changing environment and conditions during their use. For instance, a user may take photographs using the digital camera function of a cellular phone over a wide range of temperatures and orientations. Many components, including lenses, are commonly made of plastic material and are susceptible to thermal expansion and contraction. Depending on the orientation of the portable electronic device, gravity may have a different effect on movable components, such as a lens assembly for focusing, and a different amount force may be needed to move the lens assembly depending on the orientation of the portable electronic device. For instance, if gravity is acting in a direction opposite of a direction of ...
Claims
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IPC IPC(8): H04N5/232G03B43/00H04N5/225G02B7/04
CPCH04N5/23212G02B7/04G03B43/00H04N5/2254H04N5/2253H04N17/002G03B3/10G03B13/36H04N23/57H04N23/55H04N23/54H04N23/67G02B7/28
Inventor CUI, CHENGWU
Owner MICROSOFT TECH LICENSING LLC