Method for capturing image data, high dynamic range imaging system and pixel unit

A high dynamic range, pixel unit technology, applied in the field of image sensors, which can solve problems such as reduction of total image resolution

Active Publication Date: 2015-07-15
OMNIVISION TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with this HDR sensor the total image resolution i

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  • Method for capturing image data, high dynamic range imaging system and pixel unit
  • Method for capturing image data, high dynamic range imaging system and pixel unit
  • Method for capturing image data, high dynamic range imaging system and pixel unit

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Embodiment Construction

[0017] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, those skilled in the art will understand that the specific details need not be employed to practice the present invention. In other cases, well-known materials or methods have not been described in detail to avoid obscuring the present invention.

[0018] References to "one embodiment," "an embodiment," "an example," or "an example" throughout this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in the present invention In at least one embodiment. Thus, the appearances of the phrases "in one example", "in an embodiment", "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. In addition, in one or more embodiments or examples, any suitable combinati...

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Abstract

A method of reading out a pixel includes resetting a photodetector of the pixel. Light incident on the photodetector is then integrated for a single exposure of a single image capture. A floating diffusion node of the pixel is then reset. The floating pixel is set to low conversion gain and a low conversion gain reset signal is sampled from the floating diffusion node. The floating diffusion is set to high conversion gain and a high conversion gain reset signal is sampled from the floating diffusion node. Charge carriers are transferred from the photodetector to the floating diffusion node and a high conversion image signal is then sampled from the floating diffusion node. The floating diffusion is set to low conversion gain. Charge carriers are transferred again from the photodetector to the floating diffusion node and a low conversion image signal is sampled from the floating diffusion node.

Description

[0001] Reference to related applications [0002] This application claims the rights and interests of the U.S. Provisional Application No. 61 / 926,124 filed on January 10, 2014. Technical field [0003] The present invention generally relates to image sensors, and more specifically, the present invention relates to high dynamic range image sensors. Background technique [0004] Standard image sensors have a limited dynamic range of approximately 60dB to 70dB. However, the real-world brightness dynamic range is much larger. Natural scenes usually span the range of 90dB and above. To capture strong light and shadows at the same time, HDR technology has been used in image sensors to increase the captured dynamic range. The most common technique to increase the dynamic range is to merge multiple exposures captured with a standard (low dynamic range) image sensor into a single linear HDR image that has a much larger dynamic range than a single exposure image. [0005] One of the most co...

Claims

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Application Information

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IPC IPC(8): H04N5/355H04N5/378
CPCH04N5/3745H04N5/3535H04N5/35554H04N5/2355H04N25/59H04N25/623H04N25/771
Inventor J·索尔胡斯维克R·约翰松
Owner OMNIVISION TECH INC
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