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Exposure method and exposure system

An exposure method and exposure system technology, applied in the field of exposure methods and systems, can solve problems such as dark places leaving zero value, bright places leaving saturation, and unable to restore correctly

Inactive Publication Date: 2013-09-25
SHENGLE INFORMATION TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in scenes with particularly large dynamic range differences, ±EV at the default setting may not necessarily bring some bright places out of saturation, or some dark places out of zero
In this way, even with HDR photography, there are some areas that cannot be restored correctly, especially some user interest areas, such as faces shot under backlight conditions, etc.

Method used

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  • Exposure method and exposure system
  • Exposure method and exposure system
  • Exposure method and exposure system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Such as figure 1 As shown, the exposure method provided in this embodiment includes:

[0099] Step S11, using the automatic light metering file to determine the initial exposure of the scene, and taking a photo according to the initial exposure; specifically, this step can use the automatic light metering file to expose the scene;

[0100] Step S12, determine the image area to be corrected in the photo, specifically, all or part of the area in the photo can be determined as the image area to be corrected; the The image area to be corrected in the photo can be freely defined by the user as the region of interest (Region Of Interest, ROI) as the image area to be corrected. When calculating the ratio of saturated pixels or zero-valued pixels, the denominator is the actual number of pixels in the ROI , so as to ensure that the pixels in the user's region of interest can be correctly exposed;

[0101] Among them, when the user's click operation is recognized, it can be com...

Embodiment 2

[0114] The difference between this embodiment and the first embodiment is that whether to reduce the exposure amount by a preset number of steps is determined by judging whether the area of ​​the first maximum connected region is greater than a preset first area threshold.

[0115] Such as figure 2 As shown, the exposure method provided in this embodiment includes:

[0116] Step S21, using the automatic light metering gear to determine the initial exposure of the scene, and taking photos according to the initial exposure;

[0117] Step S22, determining the image area to be corrected in the photo;

[0118] Step S23, reducing the resolution of the image area to be corrected;

[0119] Step S24, counting the distribution of pixels in the image area to be corrected after the resolution is reduced, this step may specifically include:

[0120] Step S241, judging whether each pixel in the image area to be corrected is saturated according to a preset saturation threshold;

[0121]...

Embodiment 3

[0130] The difference between this embodiment and Embodiment 1 and Embodiment 2 is that whether to increase the exposure of a preset number of steps is determined by judging whether the zero value ratio is greater than a preset second ratio threshold.

[0131] Such as image 3 As shown, the exposure method provided in this embodiment includes:

[0132] Step S31, using the automatic light metering gear to determine the initial exposure of the scene, and taking photos according to the initial exposure;

[0133] Step S32, determining the image area to be corrected in the photo;

[0134] Step S33, reducing the resolution of the image area to be corrected;

[0135] Step S34, counting the distribution of pixels in the image area to be corrected after the resolution is reduced, this step may specifically include:

[0136] Step S341, judging whether each pixel in the image area to be corrected has zero value according to a preset zero value threshold, specifically, judging whether ...

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Abstract

The invention relates to an exposure method and an exposure system. The exposure method includes: determining a scene initial exposure amount by using an automatic light metering shift, taking a photo according to the initial exposure amount; determining a picture region to be corrected in the photo; performing statistics on distribution of pixels in the picture region to be corrected; according to the distribution of the pixels, determining whether the picture region to be corrected needs to be corrected, if yes, acquiring a corrected exposure amount, retaking a photo according to the corrected exposure amount, and presetting a first ratio threshold, a first area threshold, a second ratio threshold or a second area threshold, ensuring that the number of pixels of a correct exposure in the picture region to be corrected is not less than the preset first ratio threshold, the preset first area threshold, the preset second ratio threshold or the preset second area threshold. Through the above steps, the exposure method intelligently controls a bracket exposure, ensures that a majority of pixels in the picture region to be corrected can obtain a correct exposure which is neither zero value nor saturated value in a certain exposure condition, and can also be used for controlling a correct exposure amount in a region of interest of a user.

Description

technical field [0001] The invention relates to an exposure method and system. Background technique [0002] High dynamic range (High Dynamic Range, HDR) photography technology has been applied to some mobile devices (such as mobile phones, tablet computers). In some scenes with large differences in brightness, HDR photography can automatically use exposure bracketing to take multiple photos, and then compress the dynamic range through image processing to obtain a photo that is not saturated in bright places and has a sense of hierarchy in dark places. [0003] Most of the existing exposure bracketing technologies are based on the standard metering exposure, automatically adding or subtracting several EVs to obtain overexposed and underexposed photos at the same time. However, in scenes with particularly large differences in dynamic range, ±EV at the default setting may not necessarily bring some bright places out of saturation, or some dark places out of zero. In this way...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/20
Inventor 刘炜陈大年
Owner SHENGLE INFORMATION TECH SHANGHAI