CN105208281B - A kind of night scene image pickup method and device - Google Patents

A kind of night scene image pickup method and device Download PDF

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Publication number
CN105208281B
CN105208281B CN201510650056.6A CN201510650056A CN105208281B CN 105208281 B CN105208281 B CN 105208281B CN 201510650056 A CN201510650056 A CN 201510650056A CN 105208281 B CN105208281 B CN 105208281B
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image
adjustment
subgraph
pixel
bright area
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CN105208281A (en
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李小朋
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Abstract

The invention discloses a kind of night scene image pickup method and devices.The method includes obtaining a frame night scene image, the brightness for adjusting the night scene image obtains the first adjustment image;The first adjustment image is divided into bright area subgraph, normal region subgraph and dark areas subgraph according to the gray value of the pixel of the first adjustment image;Subregion exposure adjustment is carried out to the bright area subgraph and dark areas subgraph, obtains and exposes adjustment pixel adjusted, obtains target image by the original pixels that the adjustment pixel replaces corresponding position in the first adjustment image.The present invention realizes the light exposure of dynamic subregional adjustment image, avoids the problem that image overexposure, preferably reduces photographed scene, has achieved the effect that the image quality for improving image and the visual experience of user.

Description

A kind of night scene image pickup method and device
Technical field
The present embodiments relate to technique for taking more particularly to a kind of night scene image pickup methods and device.
Background technique
With the development of mobile terminal, the mobile terminals such as mobile phone are no longer limited to make a phone call or photos and sending messages etc. are simply answered With.In order to meet the diversified use demand of user, the mobile phone with good camera function is more and more applied by people In daily life or work.
For user when using mobile phone photograph, image quality good picture can be taken daytime by not being only required in, also be required Display effect preferable picture can be photographed when night.People are shot using mobile phone or other picture pick-up devices in light When than scenery or night scene in darker scene, the photo of captured scenery is often brighter than practical scenery.Night scene Middle major part scene can all have light, that is, have bright place and have dark place.When shooting night scene, due to captured scape The photo of object can be brighter than practical scenery, then, the case where thering is the region of light to be then likely to occur overexposure originally, and then lead Cause the details of the photo of shooting unintelligible, and, it may then brighten in originally darker region, and then influence the vision of user Experience.
Summary of the invention
The present invention provides a kind of night scene image pickup method and device, with realize shooting closer to night scene real scene figure Picture improves shooting effect and the visual experience of user.
In a first aspect, the embodiment of the invention provides a kind of methods for shooting night scene, comprising:
A frame night scene image is obtained, the brightness for adjusting the night scene image obtains the first adjustment image;
The first adjustment image is divided into bright area subgraph according to the gray value of the pixel of the first adjustment image Picture, normal region subgraph and dark areas subgraph;
Subregion exposure adjustment is carried out to the bright area subgraph and dark areas subgraph, obtains and exposes tune adjusted Whole pixel obtains target image by the original pixels that the adjustment pixel replaces corresponding position in the first adjustment image.
Second aspect, the embodiment of the invention also provides a kind of device for shooting night scene, which includes:
The first adjustment image determination unit, for obtaining a frame night scene image, the brightness for adjusting the night scene image is obtained The first adjustment image;
The first adjustment image division unit, for according to the gray value of the pixel of the first adjustment image by described first Adjustment image is divided into bright area subgraph, normal region subgraph and dark areas subgraph;
Target image determination unit is adjusted for carrying out subregion exposure to the bright area subgraph and dark areas subgraph It is whole, it obtains and exposes adjustment pixel adjusted, corresponding position in the first adjustment image is replaced by the adjustment pixel Original pixels obtain target image.
The present invention obtains a frame night scene image, and the brightness for adjusting the night scene image obtains the first adjustment image;According to institute The first adjustment image is divided into bright area subgraph, normal region subgraph by the gray value for stating the pixel of the first adjustment image Picture and dark areas subgraph;Subregion exposure adjustment is carried out to the bright area subgraph and dark areas subgraph, obtains exposure Adjustment pixel adjusted is obtained by the original pixels that the adjustment pixel replaces corresponding position in the first adjustment image Target image;The present invention solves the problems, such as that the light encountered in night scene shooting process influences light exposure, realizes dynamic subregion Adjustment image light exposure, avoid the problem that image overexposure, preferably restore photographed scene, reached improve image picture The effect of the visual experience of face quality and user.
Detailed description of the invention
Fig. 1 is the flow chart of the method for one of embodiment of the present invention one shooting night scene;
Fig. 2 is the flow chart of pixel set-up procedure in the method for one of embodiment of the present invention two shooting night scene;
Fig. 3 is the structural schematic diagram of the device of one of embodiment of the present invention three shooting night scene.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of flow chart of the method for shooting night scene that the embodiment of the present invention one provides, and the present embodiment is applicable to The case where image overexposure for avoiding shooting from obtaining in night scene shooting, this method can be executed by the device of shooting night scene, Specifically comprise the following steps:
Step 110 obtains a frame night scene image, and the brightness for adjusting the night scene image obtains the first adjustment image.
One frame night scene image of acquisition for mobile terminal, the night scene image can be the previous shooting stored on the mobile terminal Image, can also be with regard to current night scene shooting obtain image.The brightness of the pixel of night scene image described in acquisition for mobile terminal Value can be such that the brightness value of whole image improves, by brightness value in such a way that the brightness value of pixel is multiplied by the multiple greater than 1 Image after raising is as the first adjustment image.The mode of night scene image brightness adjustment is not limited to aforesaid way, can also pass through The sensitivity ISO value for working as preceding camera is obtained, the ISO value is turned up according to current shooting condition, according to ISO value adjusted The night scene image is adjusted to obtain the first adjustment image.For example, night scene image described in acquisition for mobile terminal to current shooting The ISO value of camera is 400, and it is found that when the grade of the ISO value of preceding camera is 100,200,400 and 800.It is mobile whole A grade is turned up in the ISO value of the camera by end, i.e., adjusts the ISO value of the camera of night scene image described in current shooting It is 800.Since the ISO value of camera is doubled, corresponding film speed also improves one times.If exposure compensating EV with ISO value is identical when being 400, and aperture and shutter speed are constant, then, light exposure is doubled also with the increase of ISO value, Therefore, the brightness of night scene image is also correspondingly improved, and in turn, obtains the first adjustment image.
Step 120, the first adjustment image is divided into according to the gray value of the pixel of the first adjustment image it is bright Region subgraph, normal region subgraph and dark areas subgraph.
The gray value of the pixel of the first adjustment image described in acquisition for mobile terminal is compared with preset threshold range.By It is also corresponding relatively high in the brightness value of the big pixel of gray value, it can be according to the gray value of the pixel of the first adjustment image With the comparison result of preset threshold range, whole Zhang Suoshu the first adjustment image is divided into bright area subgraph, normal region Subgraph and dark areas subgraph.
Step 130 carries out subregion exposure adjustment to the bright area subgraph and dark areas subgraph, obtains exposure and adjusts Adjustment pixel after whole obtains mesh by the original pixels that the adjustment pixel replaces corresponding position in the first adjustment image Logo image.
Wherein, exposure adjustment in subregion is according to exposure meter respectively to the pixel of bright area subgraph and dark areas subgraph It is exposed adjustment, reduces the light exposure of the pixel of bright area subgraph until the brightness of bright area subgraph is pre- after adjustment If threshold range in, and, so that the light exposure of the pixel of dark areas subgraph is increased up dark areas subgraph after adjustment Brightness is in preset threshold range.The pixel for including by bright area subgraph adjusted and dark areas subgraph adjusted Including pixel as adjustment pixel, obtain the adjustment pixel obtained after bright area subgraph adjustment light exposure and each respectively The coordinate of a adjustment pixel, and, the adjustment pixel obtained after the dark areas subgraph adjustment light exposure and each adjustment picture The coordinate of element, is replaced at bright area subgraph same coordinate described in the first adjustment image respectively by above-mentioned adjustment pixel Original pixels and the dark areas subgraph same coordinate at original pixels obtain target image.
The technical solution of the present embodiment, by obtaining a frame night scene image, the brightness for adjusting the night scene image obtains the One adjustment image;The first adjustment image is divided into bright area according to the gray value of the pixel of the first adjustment image Image, normal region subgraph and dark areas subgraph;Subregion is carried out to the bright area subgraph and dark areas subgraph Exposure adjustment, obtains and exposes adjustment pixel adjusted, is replaced by the adjustment pixel corresponding in the first adjustment image The original pixels of position obtain target image;The technical solution of the present embodiment solve to encounter in night scene shooting process because of light shadow The problem of ringing light exposure realizes the light exposure of dynamic subregional adjustment image, avoids the problem that image overexposure, preferably Photographed scene is restored, has achieved the effect that the image quality for improving image and the visual experience of user.
Embodiment two
Fig. 2 is the flow chart of pixel set-up procedure in the method for one of embodiment of the present invention two shooting night scene.This reality Example is applied on the basis of the technical solution of embodiment one, the bright area subgraph and dark areas subgraph will preferably be divided Regional exposure set-up procedure is described further, the specific steps are as follows:
Step 210, the algorithm that gray level image is converted by color image determine the grayscale image of the first adjustment image.
It is the colouring information of image to be removed for example, color image is become grayscale format, it is bright with gray scale chart diagram picture Spend information.The each pixel of color image occupies 3 bytes, and after becoming gray level image, each pixel occupies a byte, pixel Gray value be current color image pixel brightness, the color image pixel of RGB three-component for one, brightness generally presses Following formula calculates:
I=0.3B+0.59G+0.11R
The gray scale that the first adjustment image obtains each pixel in the first adjustment image is handled according to above-mentioned formula Value, and then obtain the grayscale image of the first adjustment image.
The gray value of pixel, determines whether the gray value is greater than preset threshold value in step 220, the acquisition grayscale image The upper limit value of range, if so, 230 are thened follow the steps, if it is not, thening follow the steps 240.
The gray value for acquiring the pixel in the grayscale image of the first adjustment image, by the gray value and preset threshold value The upper limit value of range is compared, if the gray value is greater than the upper limit value of preset threshold range, thens follow the steps 230, no Then, if the gray value is less than or equal to preset threshold range, 240 are thened follow the steps.
Step 230, the pixel for determining that gray value is greater than the upper limit value of preset threshold range are that bright area subgraph includes Pixel.
Step 240 determines whether the gray value is less than the lower limit value of preset threshold range, if so, thening follow the steps 260, if it is not, thening follow the steps 250.
By the lower limit of the gray value of the pixel in the grayscale image of the first adjustment image collected and preset threshold range Value is compared, if the gray value is less than the lower limit value of preset threshold range, 260 is thened follow the steps, otherwise, if the ash Angle value is greater than or equal to the lower limit value of preset threshold range, thens follow the steps 250.
Step 250 determines that gray value is less than or equal to the upper limit value of preset threshold range and is greater than or equal to preset The pixel of the lower limit value of threshold range is the pixel that normal region subgraph includes.
Step 260, the pixel for determining that gray value is less than the lower limit value of preset threshold range are that dark areas subgraph includes Pixel.
Step 270, the pre-set exposure meter of inquiry determine taking for the time for exposure of the camera under the conditions of current shooting It is worth range.
Step 280, the value range according to time for exposure of the camera under the conditions of current shooting, described in the adjustment of subregion The time for exposure of the time for exposure of bright area subgraph and the dark areas subgraph.
For example, being learnt according to preset exposure meter is inquired, when shooting has the field of lamplit night scenes such as lamp meeting Scape.It is higher than the bright area subgraph of preset threshold range for brightness, is obtained according to exposure meter and be less than the new of former time for exposure Time for exposure to replace former time for exposure of bright area subgraph, i.e. the reduction time for exposure, reduce light-inletting quantity.Correspondingly, right It is lower than the dark areas subgraph of preset threshold range in brightness, the new exposure for being greater than the former time for exposure is obtained according to exposure meter Time to replace former time for exposure of dark areas subgraph, i.e. the increase time for exposure, increases light-inletting quantity.
Step 290 obtains exposure adjustment pixel adjusted, passes through the adjustment pixel and replaces the first adjustment image The original pixels of middle corresponding position obtain target image.
According to the value range of the time for exposure of the camera under the conditions of current shooting, subregion adjusts bright area The time for exposure of the time for exposure of image and the dark areas subgraph, the ash for the pixel for including by the bright area subgraph The gray value for the pixel that angle value and the dark areas subgraph include is adjusted to preset threshold range, makes clear zone adjusted Domain subgraph and the dark areas subgraph are closer to reality scene.
The adjustment pixel and each adjustment pixel that acquisition for mobile terminal time for exposure bright area subgraph adjusted includes Coordinate, the original pixels of same position in the first adjustment image are replaced according to the coordinate, and, obtain the time for exposure The coordinate of adjustment pixel that dark areas subgraph adjusted includes and each adjustment pixel, according to coordinate replacement described the The original pixels of same position in one adjustment image, to obtain the better target image of details of one whole reduction photographed scene.
The technical solution of the present embodiment, by carrying out subregion exposure to the bright area subgraph and dark areas subgraph Adjustment, adjusts separately the dynamic range of the time for exposure of two subgraphs of photographed scene to realize that the brightness of whole figure is unlikely to Overexposure makes bright area subgraph not seem unintelligible because of overexposure, meanwhile, dark areas will not because of overexposure and It is shinny, and then whole target image is made preferably more really to restore the details of photographed scene, improve display effect and user Visual experience.
Embodiment three
Fig. 3 is the structural schematic diagram of the device of one of embodiment of the present invention three shooting night scene.The shooting night scene Device includes:
The first adjustment image determination unit 310, for obtaining a frame night scene image, the brightness for adjusting the night scene image is obtained To the first adjustment image;
The first adjustment image division unit 320, the gray value for the pixel according to the first adjustment image will be described The first adjustment image is divided into bright area subgraph, normal region subgraph and dark areas subgraph;
Target image determination unit 330, for carrying out subregion exposure to the bright area subgraph and dark areas subgraph Light adjustment, obtains and exposes adjustment pixel adjusted, replaces corresponding positions in the first adjustment image by the adjustment pixel The original pixels set obtain target image.
The technical solution of the present embodiment obtains a frame night scene image by the first adjustment image determination unit 310, adjusts institute The brightness for stating night scene image obtains the first adjustment image;By the first adjustment image division unit 320 according to the first adjustment The first adjustment image is divided into bright area subgraph, normal region subgraph and dark areas by the gray value of the pixel of image Subgraph;Subregion exposure is carried out to the bright area subgraph and dark areas subgraph by target image determination unit 330 Adjustment obtains and exposes adjustment pixel adjusted, replaces corresponding position in the first adjustment image by the adjustment pixel Original pixels obtain target image.The technical solution of the present embodiment solve to encounter in night scene shooting process because light influences to expose The problem of light quantity, realizes the light exposure of dynamic subregional adjustment image, avoids the problem that image overexposure, preferably restore Photographed scene has achieved the effect that the image quality for improving image and the visual experience of user.
Further, the first adjustment image determination unit 310 is specifically used for:
The sensitivity ISO value for working as preceding camera is obtained, the ISO value is turned up according to current shooting condition, according to adjustment ISO value afterwards adjusts the night scene image to obtain the first adjustment image.
Further, the first adjustment image division unit 320 is specifically used for:
The grayscale image of the first adjustment image is determined by the algorithm that color image is converted into gray level image;
Gray value is greater than the pixel of the upper limit value of preset threshold range by the gray value for acquiring pixel in the grayscale image It is determined as the pixel that bright area subgraph includes, the pixel that gray value is less than the lower limit of preset threshold range is determined as dark space The pixel that gray value belongs in the preset threshold range is determined as normal region subgraph by the pixel that domain subgraph includes Including pixel;
Bright area subgraph, normal region subgraph and dark areas subgraph are determined respectively according to the pixel definitive result Picture.
Further, the target image determination unit 330 is specifically used for:
Inquire the value range that pre-set exposure meter determines the time for exposure of camera under the conditions of current shooting;
According to the value range of the time for exposure of the camera under the conditions of current shooting, subregion adjusts bright area The time for exposure of the time for exposure of image and the dark areas subgraph, the ash for the pixel for including by the bright area subgraph The gray value for the pixel that angle value and the dark areas subgraph include is adjusted to preset threshold range.
Further, the target image determination unit 330 is also used to:
The adjustment pixel obtained after the bright area subgraph and dark areas subgraph adjustment light exposure is obtained respectively With the coordinate of each adjustment pixel, the original image in the first adjustment image at same coordinate is replaced by the adjustment pixel Element obtains target image.
The method that shooting night scene provided by any embodiment of the invention can be performed in the device of above-mentioned shooting night scene, has and holds The corresponding functional module of row method and beneficial effect.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation, It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.

Claims (8)

1. a kind of method for shooting night scene characterized by comprising
Obtain a frame night scene image, wherein the night scene image is the image shot in the past that stores on mobile terminal, or to working as The image that preceding night scene shooting obtains;
The brightness for adjusting the night scene image obtains the first adjustment image, wherein the brightness of the adjustment night scene image obtains To the first adjustment image, comprising:
The sensitivity ISO value for working as preceding camera is obtained, the ISO value is turned up according to current shooting condition, according to adjusted ISO value adjusts the night scene image to obtain the first adjustment image;
According to the comparison result of the gray value of the pixel of the first adjustment image and preset threshold range, described first is adjusted Whole image is divided into bright area subgraph, normal region subgraph and dark areas subgraph;
Subregion exposure adjustment is carried out to the bright area subgraph and dark areas subgraph, obtains and exposes adjustment picture adjusted Element obtains target image by the original pixels that the adjustment pixel replaces corresponding position in the first adjustment image;
Wherein, described that subregion exposure adjustment is carried out to the bright area subgraph and dark areas subgraph, it specifically includes:
Adjustment is exposed to the pixel of bright area subgraph and dark areas subgraph respectively according to exposure meter, makes bright area subgraph The light exposure of the pixel of picture reduces the brightness of the bright area subgraph after adjustment in preset threshold range, and, make dark The light exposure of the pixel of region subgraph be increased up adjustment after dark areas subgraph brightness in preset threshold range.
2. the method according to claim 1, wherein will according to the gray value of the pixel of the first adjustment image The first adjustment image is divided into bright area subgraph, normal region subgraph and dark areas subgraph, comprising:
The grayscale image of the first adjustment image is determined by the algorithm that color image is converted into gray level image;
The gray value for acquiring pixel in the grayscale image determines the pixel that gray value is greater than the upper limit value of preset threshold range For the pixel that bright area subgraph includes, the pixel that gray value is less than the lower limit of preset threshold range is determined as dark areas The pixel that image includes, the pixel that gray value belongs in the preset threshold range, which is determined as normal region subgraph, includes Pixel;
Bright area subgraph, normal region subgraph and dark areas subgraph are determined respectively according to pixel definitive result.
3. the method according to claim 1, wherein being carried out to the bright area subgraph and dark areas subgraph Subregion exposure adjustment, comprising:
Inquire the value range that pre-set exposure meter determines the time for exposure of camera under the conditions of current shooting;
According to the value range of the time for exposure of the camera under the conditions of current shooting, subregion adjusts the bright area subgraph Time for exposure and the dark areas subgraph time for exposure, the gray value for the pixel for including by the bright area subgraph The gray value for the pixel for including with the dark areas subgraph is adjusted to preset threshold range.
4. passing through the tune according to the method described in claim 3, exposing adjustment pixel adjusted it is characterized in that, obtaining The original pixels that whole pixel replaces corresponding position in the first adjustment image obtain target image, comprising:
Obtained adjustment pixel and each is obtained after the bright area subgraph and dark areas subgraph adjustment light exposure respectively The coordinate of a adjustment pixel is obtained by the original pixels that the adjustment pixel is replaced in the first adjustment image at same coordinate To target image.
5. a kind of device for shooting night scene characterized by comprising
The first adjustment image determination unit, for obtaining a frame night scene image, the brightness for adjusting the night scene image obtains first Adjust image, wherein the night scene image is the image shot in the past stored on mobile terminal, or is obtained to the shooting of current night scene The image obtained;
Wherein, the first adjustment image determination unit is specifically used for:
The sensitivity ISO value for working as preceding camera is obtained, the ISO value is turned up according to current shooting condition, according to adjusted ISO value adjusts the night scene image to obtain the first adjustment image;
The first adjustment image division unit, for the gray value and preset threshold value model according to the pixel of the first adjustment image The first adjustment image is divided into bright area subgraph, normal region subgraph and dark areas subgraph by the comparison result enclosed Picture;
Target image determination unit, for carrying out subregion exposure adjustment to the bright area subgraph and dark areas subgraph, It obtains and exposes adjustment pixel adjusted, the original of corresponding position in the first adjustment image is replaced by the adjustment pixel Pixel obtains target image;
Wherein, described that subregion exposure adjustment is carried out to the bright area subgraph and dark areas subgraph, it specifically includes:
Adjustment is exposed to the pixel of bright area subgraph and dark areas subgraph respectively according to exposure meter, makes bright area subgraph The light exposure of the pixel of picture reduces the brightness of the bright area subgraph after adjustment in preset threshold range, and, make dark The light exposure of the pixel of region subgraph be increased up adjustment after dark areas subgraph brightness in preset threshold range.
6. device according to claim 5, which is characterized in that the first adjustment image division unit is specifically used for:
The grayscale image of the first adjustment image is determined by the algorithm that color image is converted into gray level image;
The gray value for acquiring pixel in the grayscale image determines the pixel that gray value is greater than the upper limit value of preset threshold range For the pixel that bright area subgraph includes, the pixel that gray value is less than the lower limit of preset threshold range is determined as dark areas The pixel that image includes, the pixel that gray value belongs in the preset threshold range, which is determined as normal region subgraph, includes Pixel;
Bright area subgraph, normal region subgraph and dark areas subgraph are determined respectively according to the pixel definitive result.
7. device according to claim 5, which is characterized in that the target image determination unit is specifically used for:
Inquire the value range that pre-set exposure meter determines the time for exposure of camera under the conditions of current shooting;
According to the value range of the time for exposure of the camera under the conditions of current shooting, subregion adjusts the bright area subgraph Time for exposure and the dark areas subgraph time for exposure, the gray value for the pixel for including by the bright area subgraph The gray value for the pixel for including with the dark areas subgraph is adjusted to preset threshold range.
8. device according to claim 7, which is characterized in that the target image determination unit is also used to:
Obtained adjustment pixel and each is obtained after the bright area subgraph and dark areas subgraph adjustment light exposure respectively The coordinate of a adjustment pixel is obtained by the original pixels that the adjustment pixel is replaced in the first adjustment image at same coordinate To target image.
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