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Dark frame subtraction using multiple dark frames

A dark frame and subtraction technique, applied in the field of dark frame cancellation, can solve the problems of irrelevant noise components, increase system cost and size, etc.

Inactive Publication Date: 2009-08-19
NOKIA CORP
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the problem with this simple approach is that there are always irrelevant noise components present when the image sensor is read
However, this method requires at least two frame storage units (or two memory regions for frame storage), which may increase the cost and size of the system

Method used

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  • Dark frame subtraction using multiple dark frames
  • Dark frame subtraction using multiple dark frames
  • Dark frame subtraction using multiple dark frames

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Embodiment Construction

[0033] A new method, apparatus and software product for dark frame cancellation using multiple dark frames by storing only one frame at a time (ie using only one frame memory), thereby minimizing the amount of memory. The electronic device may be, but is not limited to, a camera, digital camera, wireless communication device, mobile phone, camera phone mobile device, portable electronic device, non-portable electronic device, and the like.

[0034]According to the embodiment of the present invention, the main frame and a plurality of dark frames can be captured by an electronic device, which can only store one frame at any time during the capture of the frame and the execution of the dark frame offset method, according to a predetermined algorithm and using the Main frame and dark frame to perform dark frame cancellation method.

[0035] For example, in memory area A, the main frame may be stored, according to one embodiment. The same memory area A can be used for dark frames...

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Abstract

The specification and drawings present a new method, apparatus and software product for a dark frame subtraction using multiple dark frames by storing only one frame at a time, i.e., using only one frame storage so that the amount of memory can be minimized. Divisional and multiplication algorithms can be used for the dark frame subtraction.

Description

[0001] CROSS-REFERENCE TO PRIORITY AND RELATED APPLICATIONS [0002] This application claims priority to US Patent Application Serial No. 11 / 514,684, filed August 31, 2006. technical field [0003] The present invention relates generally to an electronic device including a camera, and more particularly to dark frame subtraction using a plurality of dark frames. Background technique [0004] Image sensors are the components in digital cameras that convert visible light into electrical signals. Several noise components occur in this photo-sensing process, which causes deterioration in image quality. [0005] An image sensor includes an array of pixels, typically generating a digital value for each pixel. This digital value includes: a) the actual signal due to light; b) the dark signal; and c) the signal with various noise components. To improve image quality, various methods can be used to extract the actual signal from dark and noise components. [0006] One of these me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/217G06T5/50H04N5/232H04N5/357
CPCH04N5/361H04N25/63H04N19/61
Inventor J·阿拉卡尔赫H·奥雅南
Owner NOKIA CORP
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