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Automatic exposure method and device

A technology of automatic exposure and exposure value, applied in the control of exposure, optics, television, etc., can solve the problem of large amount of calculation of automatic exposure, and maximize the exposure time and reduce the amount of calculation.

Inactive Publication Date: 2008-09-10
VIMICRO CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Embodiments of the present invention provide an automatic exposure method and device to solve the problem of large amount of automatic exposure calculations in the prior art

Method used

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  • Automatic exposure method and device

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Embodiment Construction

[0022] In the embodiment of the present invention, using linear image data, according to the relationship between the exposure value (ExposureValue, EV) of the image and the exposure time and the brightness gain, the calculation of the exposure time and the brightness gain is considered comprehensively, so as to achieve smooth changes in the brightness value of the image, adjust Fast, and the effect of maintaining the highest possible signal-to-noise ratio and image quality.

[0023] For the initially exposed and extracted image data, it is judged whether it is linear data, and when the extracted image data is linear data, the automatic exposure processing is directly carried out; when the extracted image data is non-linear data, the extracted non-linear data is reversed Non-linear correction, to obtain linear data, and then perform automatic exposure processing.

[0024] Due to the discontinuity of the exposure time setting, the obtained brightness value cannot be continuous,...

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Abstract

The invention discloses a method of automatic exposure, which comprises the steps of: A. calculating a target exposure value and a current exposure value according to the relation between the brightness value and the exposure value of an image in linear data after initial exposure is carried out and image data is extracted; B. determining the exposure value difference according to the target exposure value and the current exposure value and calculating exposure time deviation value and brightness gain deviation value according to the exposure value difference; C. adjusting an exposure image to new exposure time and new brightness gain and judging whether the difference between the brightness value of the image and a target brightness value under the new exposure time and the new brightness gain meets the condition according to the exposure time deviation value and the brightness gain deviation value, if not, continuing the calculating in the step A until the difference between the brightness value of the image and the target brightness value meets the condition. Meanwhile, the invention also discloses a device of automatic exposure. The embodiment of the invention adopts the linear image data for treatment, which results in the reduction of the calculation amount of the automatic exposure.

Description

technical field [0001] The present invention relates to the technical field of image processing of camera devices, in particular to an automatic exposure method and device. Background technique [0002] The exposure time is the time during which the photosensitive member receives light. Under the premise of constant ambient brightness, the longer the exposure time of the photosensitive component, the brighter the image; conversely, the shorter the exposure time, the darker the image. If the scene in the image is too bright and there is no layer or detail in the bright part, it is overexposure; if the scene in the image is too dark and cannot truly reflect the color of the scene, it is underexposure. Therefore, when the environment changes, you should also adjust accordingly Adjust the exposure time to make the output image brightness value within a suitable range, that is, increase the exposure time appropriately when the environment is dark, and decrease the exposure time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235H04N5/243G03B7/00H04N23/76
Inventor 沈操王浩
Owner VIMICRO CORP
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