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Lens roll-off correction method and apparatus

一种镜头、滑移的技术，应用在仪器、电视、彩色电视的零部件等方向，能够解决消费者主观感受影响等问题

Inactive Publication Date: 2007-10-03
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Complicating the analysis process is the fact that the value and performance of electronic devices are not only measured by objective criteria, but may also be influenced by subjective consumer perceptions

Method used

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  • Lens roll-off correction method and apparatus
  • Lens roll-off correction method and apparatus
  • Lens roll-off correction method and apparatus

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Embodiment Construction

[0023] In a camera capable wireless phone, the choice of lens and accompanying sensor can significantly affect the cost of the wireless phone and the quality of the images that can be captured in the camera. The lenses and sensors built into the phone are usually physically smaller in order to maintain the established small size of the wireless phone.

[0024] Lens shift or shading issues are a common problem with cameras with smaller lenses. For mobile applications, the lens slip problem is particularly serious due to the small size and low quality of the lens. A common slippage problem is that the image near the corners is less bright than the center. Also, captured images may exhibit hue shifts. Due to inaccurate lens mounting, the optical center of the lens is often misaligned with the center of the image, causing the image to display an asymmetric brightness shift between the two opposing corners.

[0025] The sensor's photodiode structure is also a factor in making pi...

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Abstract

Brightness and color tone shift distortion of captured images by a non-ideal lens can be compensated by applying an inverse transfer function to the captured image. An estimate of the lens transfer function can be measured based on a radius from a center of the lens. The lens transfer function can be measured by capturing a flat field image. The center of the lens can be determined based on a relative brightness maximum. The relative brightness of the captured flat field image can then be measured as a function of radius to generate a lens response curve. Separate response curves can be measured for each color component. A correction curve can be determined as the inverse of the response curve. The correction curve can be applied to subsequent captured images to compensate for lens degradation.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 60 / 607,026, filed September 2, 2004, and entitled "Lens Roll Off Correction," which is hereby incorporated by reference in its entirety. technical field [0003] none Background technique [0004] Miniaturization, increased processing power, and reduced cost of electronic components have enabled consumer electronic devices to implement a variety of features and capabilities. Telephones, once limited to wires, are now commonly available in the form of wireless devices, allowing users to communicate from almost anywhere. [0005] Wireless telephones themselves have evolved to include a large number of features and capabilities that were not available in models of just a few years ago. It is now common for wireless telephones to take digital photographs and transfer the photographs to a networked device, such as a personal computer. [0006] One of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/217H04N1/407H04N5/357
CPCH04N5/217H04N23/81G02B7/02
Inventor 塞波·洪
Owner QUALCOMM INC
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