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Method and apparatus for controlling long exposure time

A long exposure, time technology, applied in the field of image processing

Active Publication Date: 2015-08-19
QINGDAO HISENSE MOBILE COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for controlling long exposure time, which automatically matches the long exposure time that best matches the current shooting environment by using the corresponding relationship between the preset image brightness value and the optimal long exposure time, effectively solving the problem of It solves the problem of image underexposure or overexposure, and improves the exposure effect of long exposure images

Method used

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  • Method and apparatus for controlling long exposure time
  • Method and apparatus for controlling long exposure time

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Embodiment 1

[0022] An embodiment of the present invention provides a method for controlling a long exposure time.

[0023] It should be noted that the brightness value of the image is closely related to the sensitivity and exposure time set by the shooting device. In this embodiment, when acquiring an image, only the exposure time is changed, and the sensitivity remains unchanged.

[0024] Such as figure 1 As shown, the method includes:

[0025] 101. Acquire the brightness value of the current preview image.

[0026] Wherein, the current preview image is an image obtained by the shooting device with a short exposure time under the current light intensity.

[0027] It should be noted that the current preview image is an image obtained by controlling the exposure time to a short exposure time after the user triggers the camera function of the camera device to be turned on this time, and before the camera device takes a photo. Optionally, the short exposure time is 33ms (milliseconds). ...

Embodiment 2

[0044] Embodiments of the present invention provide a method for controlling long exposure time, such as figure 2 As shown, the method includes:

[0045] 201. Obtain the corresponding relationship between the brightness value of the standard image and the optimal long exposure time.

[0046] Specifically, the manufacturer may store the corresponding relationship between the brightness value of the standard image and the optimal long exposure time in the device before leaving the factory, or it may be learned by the user through the following method during use.

[0047] Wherein, the method for obtaining the corresponding relationship between the brightness value of the standard image and the optimal long exposure time includes:

[0048] S1. Determine an optimal brightness value.

[0049] It should be noted that the optimal brightness value is the corresponding brightness value that can give people the best visual effect when viewing an image. If the luminance value is repre...

Embodiment 3

[0085] An embodiment of the present invention provides a method for controlling a long exposure time.

[0086] It should be noted that the brightness value of an image is closely related to the light intensity of the environment when the image is captured. In addition to processing the camera, the photographing device in this embodiment must also have a device capable of collecting light intensity. And there must be an overlap between the area where the camera collects images and the sensing area of ​​the device that collects light intensity, and the larger the overlapping area, the better. Because the larger the overlapping area is, the closer the light intensity in the environment collected by the device for collecting the light intensity is to the light intensity sensed by the camera when the long-exposure image is taken.

[0087] Such as image 3 As shown, the method includes:

[0088] 301. Acquire the current light intensity.

[0089] Specifically, the device for coll...

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Abstract

The invention provides a method and apparatus for controlling long exposure time and belongs to the image processing field. With the method and apparatus of the invention adopted, the problem of underexposure and overexposure of images can be effectively solved. The method includes the following steps of: obtaining the brightness value of a current preview image; determining target long exposure time from the corresponding relation of the brightness value of a preset standard image and optimal long exposure time, wherein the standard image is an image which is obtained through utilizing short exposure time under different illumination intensities, the optimal long exposure time is long exposure time corresponding to an image of which the brightness value is most approximate to an optimal brightness value in images which are obtained through utilizing different long exposure time, and the corresponding relation of the brightness value of the standard image and the optimal long exposure time is a corresponding relation of the brightness value of a standard image and optimal long exposure time in the same illumination intensity; and controlling the exposure time of a photographing device through utilizing the target long exposure time so as to make the photographing device obtain a long-exposure image through utilizing the target long exposure time.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method and device for controlling long exposure time. Background technique [0002] With the diversified development of smart phones, the characteristic functions of mobile phones have gradually become the biggest selling point of smart phones, and camera phones with camera functions as the main feature have gradually gained the favor of photographers. [0003] Among the various functions of camera phones, the long-exposure function has attracted the attention of many customers because it can show the busy traffic at night and has the effect of light painting. Long exposure technology enables the photosensitive device to accumulate images captured by the lens over a period of time by controlling the time interval from opening to closing of the shutter. When shooting long-exposure images, in the case of poor light conditions, the exposure time is generally controlled to be longe...

Claims

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Application Information

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IPC IPC(8): H04N5/235
Inventor 李兵孔志强谢志宇周长生闫三峰邱绪东
Owner QINGDAO HISENSE MOBILE COMM TECH CO LTD
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