CN107888840A - High-dynamic-range image acquisition method and device - Google Patents
High-dynamic-range image acquisition method and device Download PDFInfo
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- CN107888840A CN107888840A CN201711036202.1A CN201711036202A CN107888840A CN 107888840 A CN107888840 A CN 107888840A CN 201711036202 A CN201711036202 A CN 201711036202A CN 107888840 A CN107888840 A CN 107888840A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
Abstract
This application discloses a kind of high-dynamic-range image acquisition method and device, wherein method includes：From automatic exposure control system, monochrome information corresponding with current scene is obtained；The monochrome information according to corresponding to current scene, determine pixel ratio threshold value and luminance threshold corresponding to current scene；Each color channel histograms corresponding to current scene are determined, wherein each color channel histograms include the different brightness under each Color Channel and the corresponding relation of pixel ratio；Pixel ratio threshold value, luminance threshold and each color channel histograms, are determined whether as reversible-light shooting according to corresponding to current scene；When it is determined that being currently reversible-light shooting, high dynamic range images screening-mode is utilized to obtain the high dynamic range images of current scene.The present processes improve the degree of accuracy to the detection of photographed scene backlight, and then ensure that the quality of shooting picture, improve Consumer's Experience.
Description
Technical field
The application is related to exposure-processed technical field, more particularly to a kind of high-dynamic-range image acquisition method and device.
Background technology
At present, the function of various intelligent terminals is diversified all the more, and user can be taken pictures by the camera of terminal device.It is special
It is not when shooting environmental is in backlight, the camera exposal model that will automatically switch is high dynamic range images (High
Dynamic Range, referred to as：HDR) pattern is taken pictures, to obtain the measured image of matter.
In actual application, terminal device is generally based on color coding space (YUV) and shooting environmental is examined
Survey, to determine whether current shooting environment is backlight environment.But yuv data is by image processor (Image
Signal Processor, referred to as：ISP) carry out what is obtained after a series of processing, this will result in data in YUV simultaneously
Current shooting environmental can not really be reflected completely, so as to cause the detection to shooting environmental error occur, influence shooting figure
The quality of picture.
The content of the invention
The application is intended at least solve one of above-mentioned technological deficiency to a certain extent.
Therefore, first purpose of the application is to propose a kind of high-dynamic-range image acquisition method, this method improves
The degree of accuracy to the detection of photographed scene backlight, and then ensure that the quality of shooting picture, improve Consumer's Experience.
Second purpose of the application is to propose a kind of high dynamic range image acquisition device.
The 3rd purpose of the application is to propose a kind of terminal device.
The 4th purpose of the application is to propose a kind of computer-readable recording medium.
To achieve these goals, the high-dynamic-range image acquisition method of the application first aspect embodiment, including：From
In automatic exposure control system, monochrome information corresponding with current scene is obtained；Believed according to brightness corresponding to the current scene
Breath, determines pixel ratio threshold value and luminance threshold corresponding to the current scene；Determine each color corresponding to the current scene
Channel histogram, wherein each color channel histograms include the different brightness pass corresponding with pixel ratio under each Color Channel
System；According to pixel ratio threshold value, luminance threshold and each color channel histograms corresponding to the current scene, determine whether
For reversible-light shooting；When it is determined that being currently reversible-light shooting, high dynamic range images screening-mode is utilized to obtain the current scene
High dynamic range images.
To achieve these goals, the high dynamic range image acquisition device of the application second aspect embodiment, including：The
One acquisition module, for from automatic exposure control system, obtaining monochrome information corresponding with current scene；First determines mould
Block, for the monochrome information according to corresponding to the current scene, determine pixel ratio threshold value corresponding to the current scene and bright
Spend threshold value；Second determining module, for determining each color channel histograms corresponding to the current scene, wherein each Color Channel
Histogram includes the different brightness under each Color Channel and the corresponding relation of pixel ratio；3rd determining module, for according to institute
Pixel ratio threshold value corresponding to current scene, luminance threshold and each color channel histograms are stated, determine whether to clap for backlight
Take the photograph；Second acquisition module, for it is determined that it is current be reversible-light shooting when, using described in the acquisition of high dynamic range images screening-mode
The high dynamic range images of current scene.
To achieve these goals, the terminal device of the application third aspect embodiment, including：Memory, processor and
Camera module；The camera module, for gathering the image under current scene；The memory, for storing executable program
Code；The processor, run and the executable journey for reading the executable program code stored in the memory
Program corresponding to sequence code, for realizing the high-dynamic-range image acquisition method described in first aspect embodiment.
To achieve these goals, the computer-readable recording medium of the application fourth aspect embodiment, is stored thereon with
Computer program, the computer program realize that the high dynamic range images described in first aspect embodiment obtain when being executed by processor
Take method.
Technical scheme disclosed in the present application, has the advantages that：
By from automatic exposure control system, obtaining monochrome information corresponding with current scene, and working as according to acquisition
Monochrome information corresponding to preceding scene, pixel ratio threshold value and luminance threshold corresponding to current scene are determined, and determine current scene
Corresponding each color channel histograms, then pixel ratio threshold value, luminance threshold and each color are led to according to corresponding to current scene
Road histogram, determine whether as reversible-light shooting, however, it is determined that when being currently reversible-light shooting, shot using high dynamic range images
The high dynamic range images of pattern acquiring current scene.Thus, the degree of accuracy to the detection of photographed scene backlight, Jin Erbao are improved
The quality of shooting picture has been demonstrate,proved, has improved Consumer's Experience..
The aspect and advantage that the application adds will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the application.
Brief description of the drawings
The above-mentioned and/or additional aspect of the application and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and it is readily appreciated that, wherein,
Fig. 1 is the flow chart according to the high-dynamic-range image acquisition method of the application one embodiment；
Fig. 2 is the schematic diagram divided to photographed scene according to one embodiment of the application；
Fig. 3 (a) is the schematic diagram according to the red channel histogram of the application one embodiment；
Fig. 3 (b) is the schematic diagram according to the green channel histogram of the application one embodiment；
Fig. 3 (c) is the schematic diagram according to the blue channel histogram of the application one embodiment；
Fig. 4 (a)-Fig. 4 (c) is channel histogram of each Color Channel of the application one embodiment under backlight scene；
Fig. 5 is the flow chart according to the high-dynamic-range image acquisition method of the application another embodiment；
Fig. 6 is the structural representation according to the high dynamic range image acquisition device of the application one embodiment；
Fig. 7 is the structural representation according to the terminal device of the application one embodiment.
Embodiment
Embodiments herein is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the application, and it is not intended that limitation to the application.
In order to solve in correlation technique, when terminal device is detected based on YUV to present filming scene, because yuv data is
Obtained after image processor carries out a series of processing, this results in yuv data can not really reflect currently completely
Shooting environmental, so as to cause the detection of shooting environmental error occur, the problem of influenceing the quality of shooting image, it is proposed that a kind of
High-dynamic-range image acquisition method,
The high-dynamic-range image acquisition method that the application provides, by from automatic exposure control system (Auto
Exposure Control, referred to as：AEC in), monochrome information corresponding with current scene is obtained, then according to current scene
Corresponding monochrome information, pixel ratio threshold value and luminance threshold corresponding to current scene are determined, and determined corresponding to current scene
Each color channel histograms, wherein each color channel histograms include the different brightness under each Color Channel and pair of pixel ratio
It should be related to, then pixel ratio threshold value, luminance threshold and each color channel histograms according to corresponding to current scene, it is determined that currently
Whether it is reversible-light shooting, when it is currently reversible-light shooting to determine, current field is obtained using high dynamic range images screening-mode
The high dynamic range images of scape.Thus, the degree of accuracy to the detection of photographed scene backlight is improved, ensure that the matter of shooting picture
Amount, improves Consumer's Experience.
Below with reference to the accompanying drawings the high dynamic range images exposure compensating value-acquiring method of the embodiment of the present application is described.
Fig. 1 is the flow chart according to the high-dynamic-range image acquisition method of the application one embodiment.
As shown in figure 1, the high-dynamic-range image acquisition method of the application may comprise steps of：
Step 101, from automatic exposure control system, monochrome information corresponding with current scene is obtained.
Specifically, the high-dynamic-range image acquisition method that the embodiment of the present application provides, the height that can be provided by the application
Dynamic image acquisition device is performed, and said apparatus is configured in terminal device, to realize that the detection to photographed scene is carried out
Control.
Wherein, terminal device can be any hardware device with camera function in the present embodiment, such as smart mobile phone,
Camera, personal computer (personal computer, referred to as PC) etc., the present invention are not especially limited to this.
Specifically, due in actual applications, when carrying out shooting operation to shooting area using terminal device, AEC can be with
According to the brightness of photographed scene, automatic exposure compensation deals are carried out to shooting picture.Therefore the present embodiment can be obtained directly from AEC
Take monochrome information corresponding with current scene.
Wherein, in the present embodiment, the monochrome information of acquisition can be represented by any one in following information：lux
Index, either iso or gain values, the application are not especially limited to this.
Step 102, the monochrome information according to corresponding to current scene, pixel ratio threshold value corresponding to current scene and bright is determined
Spend threshold value.
Need what is illustrated, when being in backlight state due to same object, when in the photographed scene of different brightness, have
Feature is different, therefore in order that pixel ratio threshold value and luminance threshold are more accurate corresponding to the current scene that must be determined, the application
One can be carried out to photographed scene substantially to divide, and pixel ratio threshold value and brightness are carried out respectively to the scene of division in advance
The setting of threshold value.
Such as photographed scene can be divided into three according to the brightness size of photographed scene, respectively high brightness scene, in
Brightness scene and low-brightness scene, scene partitioning result is referring specifically to shown in Fig. 2.
Wherein, high brightness scene can be the region of the well lighteds such as outdoor, and middle brightness scene can be that indoor light is preferable
Region, low-brightness scene can be then region etc. of night light difference, and the application is not especially limited to this.
After being divided to different scenes, the present embodiment further can carry out pixel ratio threshold value to each scene
And the setting of luminance threshold.
Wherein, the pixel ratio threshold value of above-mentioned each scene and luminance threshold can carry out adaptability according to actual use demand
Set, the application is not especially limited to this.
Further, when carrying out scene partitioning to photographed scene, and to pixel ratio threshold corresponding to each scene setting
After value and luminance threshold, the present embodiment can by monochrome information corresponding to current scene that step 101 obtains, respectively with division
Each scene is matched, to determine pixel ratio threshold value and luminance threshold corresponding to current scene.
During specific implementation, can first according to the default luminance threshold of each scene and the corresponding relation of brightness range, it is determined that with
Subject brightness range corresponding to current scene；Then according to default brightness range and pixel ratio threshold value and pair of luminance threshold
It should be related to, it is determined that pixel ratio threshold value corresponding with subject brightness range and luminance threshold.
That is, the present embodiment is first according to the current scene monochrome information of acquisition, in the brightness range of different scenes
In matched, and the scene according to corresponding to the brightness range that the match is successful determines current scene, then corresponding to
Default pixel ratio threshold value and luminance threshold are obtained in scene.
For example, if monochrome information corresponding to the current scene obtained is 3 luxs (lux), and three divided in advance
Individual scene is respectively night, indoor and outdoor, and brightness range corresponding to above three scene is respectively：0.001~0.3lux,
100~1000lux, more than 1000lux.Can be so 3 brightness ranges corresponding with above three scene respectively by monochrome information
0.001~0.3lux, 100~1000lux, matched more than 1000lux, determine that the monochrome information of current scene belongs to
100~1000lux brightness range.Then it is that 100~1000lux correspondingly determines that current scene belongs to room according to brightness range
It is interior, and then pixel ratio threshold value and luminance threshold corresponding to interior can be obtained.
Step 103, each color channel histograms corresponding to current scene are determined, wherein each color channel histograms are included respectively
The corresponding relation of different brightness and pixel ratio under Color Channel.
Specifically, each color channel histograms, the present embodiment corresponding to current scene can be determined according to RGB data
This is not repeated excessively.
It should be noted that if the RGB data obtained in the present embodiment includes red (R), green (G), blue (B) three colors
Passage, then be then three, respectively red channel histogram, green channel Nogata to each color channel histograms that should determine that
Figure and blue channel histogram.
Further, three kinds of color channel histograms of above-mentioned determination, can for details, reference can be made to shown in Fig. 3, and Fig. 3 (a) is red
Chrominance channel histogram, Fig. 3 (b) are green channel histogram, and Fig. 3 (c) is blue channel histogram.Wherein, each Color Channel is straight
In square figure, x-axis represents brightness of image, and y-axis represents that each pixel is located at the pixel ratio under the brightness in image.
If the RGB data obtained in the present embodiment includes R, Gr, Gb, during tetra- Color Channels of B, then to the face that should determine that
Chrominance channel histogram is then four, respectively red channel histogram, green (Gr) channel histogram, green (Gb) passage Nogata
Figure and blue channel histogram.
Step 104, pixel ratio threshold value, luminance threshold and each color channel histograms according to corresponding to current scene, really
Whether it is reversible-light shooting before settled.
It should be noted that during due to backlight scene, the histogram of each Color Channel, generally such as Fig. 4 (a)-Fig. 4 (c) institutes
The form shown, for " bimodal " distribution, i.e., pixel majority concentrates on the position of minimum brightness and maximum brightness.
Wherein, Fig. 4 (a) is the histogram of red channel under backlight scene, and Fig. 4 (b) is green channel under backlight scene
Histogram, Fig. 4 (c) are the histogram of blue channel under backlight scene.Wherein, in each color channel histograms, x-axis represents image
Brightness, y-axis represent that each pixel is located at the pixel ratio under the brightness in image.
Therefore, the pixel ratio threshold value in the present embodiment can include two, respectively the first pixel ratio threshold value and the
Two pixel ratio threshold values.
Corresponding, luminance threshold also includes two, respectively the first luminance threshold and the second luminance threshold.
Also, above-mentioned pixel ratio threshold value and luminance threshold are mutually correspondingly arranged, i.e. the first pixel ratio threshold value with
First luminance threshold is corresponding, and the second pixel ratio threshold value is corresponding with the second luminance threshold.
So as to after the histogram of current scene is got, you can according to the histogram of current scene, judge it is current whether
For reversible-light shooting.Specifically, above-mentioned steps 104, can be accomplished by the following way：
Direction according to brightness from low to high and from high to low respectively, pixel ratio in each color channel histograms is counted successively
The sum of example value；
It is determined that according to brightness from low to high pixel ratio and when reaching the first pixel ratio threshold value, each Color Channel point
Not corresponding each first brightness value；
It is determined that according to brightness from high to low pixel ratio and when reaching the second pixel ratio threshold value, each Color Channel point
Not corresponding each second brightness value；
If the first brightness value corresponding to any Color Channel is less than the first luminance threshold, and the second brightness value is bright more than second
Spend threshold value, it is determined that be currently reversible-light shooting.
For example, if the first pixel ratio threshold value is 6%, corresponding first luminance threshold is 10, the second pixel ratio
Threshold value is 10%, corresponding second luminance threshold be 230, and each color channel histograms be respectively red channel histogram,
Green channel histogram and blue channel histogram.
After to red channel histogram, green channel histogram and blue channel histogram analysis, red is logical
In road histogram, brightness from 0 to 255 change when, pixel ratio threshold value reach 6% when, corresponding first brightness RL=8；Green
In channel histogram, brightness from 0 to 255 change when, pixel ratio threshold value reach 6% when, corresponding first brightness GL=11；It is blue
In the histogram of chrominance channel, brightness from 0 to 255 change when, pixel ratio threshold value reach 6% when, corresponding first brightness BL=15.
It is corresponding, in red channel histogram, brightness from 255 to 0 change when, pixel ratio threshold value reach 10% when, it is right
The the first brightness RL=234 answered；In green channel histogram, from 255 to during 0 change, pixel ratio threshold value reaches 10% for brightness
When, corresponding first brightness GL=221；In blue channel histogram, from 255 to during 0 change, pixel ratio threshold value reaches for brightness
When 10%, corresponding first brightness BL=205；
It can therefore be seen that the first brightness value of red channel histogram is less than the first luminance threshold, the second brightness value is big
In the second luminance threshold, it is determined that be currently reversible-light shooting.
Step 105, when it is determined that being currently reversible-light shooting, high dynamic range images screening-mode is utilized to obtain current scene
High dynamic range images.
Specifically, can according to corresponding to current scene each color channel histograms, determine that exposure is mended corresponding to current scene
Repay value；Normal exposure image, under-exposure image and overexposure light image corresponding to current scene are obtained based on exposure bias value；Will just
Normal exposure image, under-exposure image and overexposure light image carry out fusion treatment, generate the high dynamic range images of current scene.
During specific implementation, can first according to the corresponding relation of different brightness and pixel ratio under each color channel histograms, just
Often exposure luminance threshold and pixel ratio threshold value, determine the under-exposure degree and overexposure degree of current scene, Ran Houji
Default exposure compensating mapping table is inquired about in under-exposure degree and overexposure degree, to determine the under-exposure offset of current scene
With overexposure offset.
Further, after the under-exposure offset and overexposure offset of current scene is determined, the present embodiment can
The overexposure light image of current scene and under-exposure image are obtained according to above-mentioned under-exposure offset and overexposure offset respectively.So
The normal exposure image, under-exposure image and overexposure light image of acquisition are subjected to image co-registration afterwards, obtaining one can show more
The high quality high dynamic range images of more image details.
It is understood that the application high dynamic range image acquisition device, by obtaining brightness corresponding to current scene
Information, pixel ratio threshold value and luminance threshold corresponding to current scene are determined, and determine that each color is led to corresponding to current scene
Road histogram, then determine whether to clap for backlight according to pixel ratio threshold value, luminance threshold and each color channel histograms
Take the photograph, and then ensure that when being currently reversible-light shooting, by starting high dynamic range images screening-mode to current shooting region
Under-exposure image taking, overexposure image taking and normal exposure image taking are carried out, above three image is then subjected to figure
A high dynamic range images are obtained as merging, so as to the details in apparent display image, more real reflection is worked as
The actual visual effect of preceding scene, improve the quality of image.
In the high-dynamic-range image acquisition method of the embodiment of the present application, by from automatic exposure control system, obtaining
Monochrome information corresponding with current scene, and the monochrome information according to corresponding to the current scene of acquisition, determine that current scene is corresponding
Pixel ratio threshold value and luminance threshold, and each color channel histograms corresponding to current scene are determined, then according to current field
Pixel ratio threshold value, luminance threshold and each color channel histograms corresponding to scape, are determined whether as reversible-light shooting, however, it is determined that
When being currently reversible-light shooting, high dynamic range images screening-mode is utilized to obtain the high dynamic range images of current scene.Thus,
The degree of accuracy to the detection of photographed scene backlight is improved, and then ensure that the quality of shooting picture, improves Consumer's Experience.
By above-mentioned analysis, the application monochrome information according to corresponding to current scene, determine corresponding to current scene
Pixel ratio threshold value and luminance threshold, and corresponding each color channel histograms, then according to the pixel ratio threshold value of determination, bright
Threshold value and each color channel histograms are spent, are determined whether as reversible-light shooting.A kind of in the application possible realizes scene
In, if photographed scene includes face, then in order to ensure the effect of human face region in the image of shooting, AEC can be automatically to figure
As carrying out reasonable spectrum assignment, so as to ensure that the picture of shooting will not be excessively dark, and now background is it is possible that overexposure.Cause
This, in the embodiment of the present application, detect photographed scene whether backlight when, can be with base if present filming scene includes face
In above-mentioned reason, detection threshold value is suitably adjusted so as to currently whether be backlight detection it is more accurate, from causing
It is higher to shoot the picture quality come.With reference to Fig. 5, the above situation is specifically described.
Fig. 5 is the flow chart of another high-dynamic-range image acquisition method of the application.
As shown in figure 5, the high-dynamic-range image acquisition method of the application may comprise steps of：
Step 501, from automatic exposure control system, monochrome information corresponding with current scene is obtained.
Step 502, the monochrome information according to corresponding to current scene, pixel ratio threshold value corresponding to current scene and bright is determined
Spend threshold value.
Step 503, Face datection is carried out to current scene.
, can be by face recognition technology (Face Recognition Technology) to current scene during specific implementation
Shooting picture carry out Face datection operation.
Wherein, a variety of Face datection modes are may include in face recognition technology, such as, Face datection, the mould of feature based
The Face datection of plate matching method, Face datection based on adaboost algorithms etc., the application is not especially limited to this.
Step 504, however, it is determined that current scene includes human face region, then is adjusted to pixel ratio threshold value and luminance threshold
It is whole.
It should be noted that when it is determined that current scene includes human face region, face part is controlled by AEC rationally to expose
Light, hence in so that the dark portion in shooting picture may not be excessively dark, and its background would generally overexposure.This just easilys lead to shoot
The overall brightness of picture is enhanced.
And after the overall brightness of shooting picture is enhanced, it is continuing with the pixel ratio threshold value determined in step 402
And luminance threshold come judge currently whether be reversible-light shooting when, then will exist judge the problem of inaccurate.
Therefore, in order to avoid the generation of above mentioned problem, the application are right when human face region in determining current scene be present
Whether the pixel ratio threshold value and luminance threshold determined in step 502 is suitably adjusted, to cause to being currently reversible-light shooting
Accuracy of detection it is higher.
Wherein, due in the picture of shooting pixel be to compare to concentrate on that brightness is minimum and highest position, therefore this implementation
Pixel ratio threshold value in example can include the first pixel ratio threshold value and the second pixel ratio threshold value.
Corresponding, luminance threshold can also include the first luminance threshold and the second luminance threshold.
Also, above-mentioned pixel ratio threshold value and luminance threshold are mutually correspondingly arranged, i.e. the first pixel ratio threshold value with
First luminance threshold is corresponding, and the second pixel ratio threshold value is corresponding with the second luminance threshold.
During specific implementation, the application may include when being adjusted to pixel ratio threshold value and luminance threshold：
Reduce the first pixel ratio threshold value, or the first luminance threshold of increase；
Increase the second pixel ratio threshold value, or the second luminance threshold of increase.
Need what is illustrated, why the application reduces by the first pixel ratio threshold value, or the first luminance threshold of increase, be because
After to pass through AEC exposure compensating when the shooting picture comprising human face region, the brightness in shooting picture has been enhanced, if
Now still use the first previously determined pixel ratio threshold value, come judge currently whether be reversible-light shooting when, then be likely to occur
Originally dark pixel is not dark, then causes the presence error judged.
Likewise, the first luminance threshold of increase, after AEC exposure compensating, leads also for shooting picture is prevented
Whether the shooting for causing finally to judge is that backlight has error.
Similar, after shooting picture passes through AEC exposure compensating, the overall brightness of shooting picture is enhanced, then just
Occur that the pixel ratio in most bright position increases, it is therefore desirable to increase the second pixel ratio threshold value, or, increase second is bright
Spend threshold value.
Step 505, each color channel histograms corresponding to current scene are determined, wherein each color channel histograms are included respectively
The corresponding relation of different brightness and pixel ratio under Color Channel.
Step 506, according to the pixel ratio threshold value after adjustment, luminance threshold and each color channel histograms, it is determined that currently
Whether it is reversible-light shooting.
Step 507, when it is determined that being currently reversible-light shooting, high dynamic range images screening-mode is utilized to obtain current scene
High dynamic range images.
In the high-dynamic-range image acquisition method of the embodiment of the present application, by determining pixel corresponding to current scene
After proportion threshold value and luminance threshold, Face datection is carried out to current scene, if detecting to have human face region in current scene,
Then pixel ratio threshold value and luminance threshold are adjusted, so as to improve the degree of accuracy to the detection of photographed scene backlight, and then
The quality of shooting picture is ensure that, improves Consumer's Experience.
In order to realize above-described embodiment, the invention also provides a kind of high dynamic range image acquisition device.
Fig. 6 is the structural representation of the high dynamic range image acquisition device of one embodiment of the invention.
As shown in fig. 6, the high dynamic range image acquisition device of the application includes：First acquisition module 11, first determines
Module 12, the second determining module 13, the 3rd determining module 14 and the second acquisition module 15.
Wherein, the first acquisition module 11 is used for from automatic exposure control system, obtains brightness corresponding with current scene
Information；
First determining module 12 is used for the monochrome information according to corresponding to the current scene, determines that the current scene is corresponding
Pixel ratio threshold value and luminance threshold；
Second determining module 13 is used to determine each color channel histograms corresponding to the current scene, wherein each color is led to
Road histogram includes the different brightness under each Color Channel and the corresponding relation of pixel ratio；
3rd determining module 14 is used for pixel ratio threshold value, luminance threshold and each color according to corresponding to the current scene
Channel histogram, determine whether as reversible-light shooting；
Second acquisition module 15 is used to when it is determined that being currently reversible-light shooting, obtain using high dynamic range images screening-mode
Take the high dynamic range images of the current scene.
Further, in another embodiment of the application, the pixel ratio threshold value includes：In correspondence with each other first
Pixel ratio threshold value, the first luminance threshold and the second pixel ratio threshold value, the second luminance threshold；
3rd determining module 14, including：
Statistic unit, for the direction according to brightness from low to high and from high to low respectively, each color is counted successively
The sum of pixel ratio in channel histogram；
First determining unit, for determine according to brightness from low to high pixel ratio and reach the first pixel ratio threshold
During value, each first brightness value corresponding to each Color Channel difference；
Second determining unit, for determine according to brightness from high to low pixel ratio and reach the second pixel ratio threshold
During value, each second brightness value corresponding to each Color Channel difference；
3rd determining unit, if being less than the first luminance threshold, and for the first brightness value corresponding to any Color Channel
Two brightness values are more than the second luminance threshold, it is determined that are currently reversible-light shooting.
It should be noted that the foregoing explanation to high-dynamic-range image acquisition method embodiment is also applied for the reality
The high dynamic range image acquisition device of example is applied, its realization principle is similar, and here is omitted.
In the high dynamic range image acquisition device that the present embodiment provides, by from automatic exposure control system, obtaining
Monochrome information corresponding with current scene, and the monochrome information according to corresponding to the current scene of acquisition, determine that current scene is corresponding
Pixel ratio threshold value and luminance threshold, and each color channel histograms corresponding to current scene are determined, then according to current field
Pixel ratio threshold value, luminance threshold and each color channel histograms corresponding to scape, are determined whether as reversible-light shooting, however, it is determined that
When being currently reversible-light shooting, high dynamic range images screening-mode is utilized to obtain the high dynamic range images of current scene.Thus,
The degree of accuracy to the detection of photographed scene backlight is improved, and then ensure that the quality of shooting picture, improves Consumer's Experience.
In order to realize above-described embodiment, the present invention also proposes a kind of terminal device.
Fig. 7 is the structural representation of the terminal device of one embodiment of the invention.
Referring to Fig. 7, the application terminal device includes memory 21, processor 22 and camera module 23；
The camera module 23 is used to gather the image under current scene；
The memory 21 is used to store executable program code；
The processor 22 be used to reading the executable program code that is stored in the memory 21 run with it is described can
Program corresponding to configuration processor code, for realizing the high-dynamic-range image acquisition method described in first aspect embodiment.
Wherein high-dynamic-range image acquisition method includes：From automatic exposure control system, brightness corresponding with current scene is obtained
Information；According to monochrome information corresponding to the current scene, pixel ratio threshold value and brightness corresponding to the current scene are determined
Threshold value；Each color channel histograms corresponding to the current scene are determined, wherein each color channel histograms are led to including each color
The corresponding relation of different brightness and pixel ratio under road；According to pixel ratio threshold value, luminance threshold corresponding to the current scene
Value and each color channel histograms, are determined whether as reversible-light shooting；When it is determined that being currently reversible-light shooting, high dynamic is utilized
Range image screening-mode obtains the high dynamic range images of the current scene.
Wherein, terminal device can be any hardware device with camera function in the present embodiment, such as smart mobile phone,
Camera, personal computer (personal computer, referred to as PC) etc., the present invention are not especially limited to this.
It should be noted that the foregoing explanation to high-dynamic-range image acquisition method embodiment is also applied for the reality
The terminal device of example is applied, its realization principle is similar, and here is omitted.
In the terminal device that the present embodiment provides, by from automatic exposure control system, obtaining corresponding with current scene
Monochrome information, and the monochrome information according to corresponding to the current scene of acquisition determines pixel ratio threshold value corresponding to current scene
And luminance threshold, and each color channel histograms corresponding to current scene are determined, then the pixel ratio according to corresponding to current scene
Example threshold value, luminance threshold and each color channel histograms, are determined whether as reversible-light shooting, however, it is determined that be currently reversible-light shooting
When, utilize the high dynamic range images of high dynamic range images screening-mode acquisition current scene.Thus, improve to shooting field
The degree of accuracy of scape backlight detection, and then the quality of shooting picture is ensure that, improve Consumer's Experience.
In order to realize above-described embodiment, the invention also provides a kind of computer-readable recording medium.
The computer-readable recording medium, is stored thereon with computer program, and the program realizes when being executed by processor
The high-dynamic-range image acquisition method of one side embodiment.Wherein high dynamic range images method includes：From automatic exposure control
In system processed, monochrome information corresponding with current scene is obtained；According to monochrome information corresponding to the current scene, it is determined that described
Pixel ratio threshold value and luminance threshold corresponding to current scene；Each color channel histograms corresponding to the current scene are determined,
Wherein each color channel histograms include the different brightness under each Color Channel and the corresponding relation of pixel ratio；Worked as according to described
Pixel ratio threshold value, luminance threshold and each color channel histograms, are determined whether as reversible-light shooting corresponding to preceding scene；
It is determined that when being currently reversible-light shooting, high dynamic range images screening-mode is utilized to obtain the HDR figure of the current scene
Picture.
In the present invention, unless otherwise clearly defined and limited, the term such as term " setting ", " connection " should do broad sense reason
Solution, for example, it may be mechanically connecting or electrically connecting；Can be joined directly together, the indirect phase of intermediary can also be passed through
Even, can be two element internals connection or two elements interaction relationship, limited unless otherwise clear and definite.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include at least one this feature.
Any process or method described otherwise above description in flow chart or herein is construed as, and represents to include
Module, fragment or the portion of the code of the executable instruction of one or more the step of being used to realize specific logical function or process
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discuss suitable
Sequence, including according to involved function by it is basic simultaneously in the way of or in the opposite order, carry out perform function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, software that multiple steps or method can be performed in memory and by suitable instruction execution system with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, have suitable combinational logic gate circuit application specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method carries
Suddenly it is that by program the hardware of correlation can be instructed to complete, described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
Storage medium mentioned above can be read-only storage, disk or CD etc..Although have been shown and retouch above
Embodiments of the invention are stated, it is to be understood that above-described embodiment is exemplary, it is impossible to be interpreted as the limit to the present invention
System, one of ordinary skill in the art can be changed to above-described embodiment, change, replace and become within the scope of the invention
Type.
Claims (10)
- A kind of 1. high-dynamic-range image acquisition method, it is characterised in that including：From automatic exposure control system, monochrome information corresponding with current scene is obtained；According to monochrome information corresponding to the current scene, pixel ratio threshold value and luminance threshold corresponding to the current scene are determined Value；Each color channel histograms corresponding to the current scene are determined, wherein, each color channel histograms are led to including each color The corresponding relation of different brightness and pixel ratio under road；According to pixel ratio threshold value, luminance threshold and each color channel histograms corresponding to the current scene, it is determined that being currently No is reversible-light shooting；When it is determined that being currently reversible-light shooting, high dynamic range images screening-mode is utilized to obtain the high dynamic of the current scene Range image.
- 2. the method as described in claim 1, it is characterised in that the pixel ratio threshold value includes：The first picture in correspondence with each other Plain proportion threshold value, the first luminance threshold and the second pixel ratio threshold value, the second luminance threshold；The pixel ratio threshold value according to corresponding to the current scene, luminance threshold and each color channel histograms, it is determined that working as Whether preceding be reversible-light shooting, including：Direction according to brightness from low to high and from high to low respectively, pixel ratio in each color channel histograms is counted successively The sum of example value；It is determined that according to brightness from low to high pixel ratio and when reaching the first pixel ratio threshold value, each Color Channel is right respectively Each first brightness value answered；It is determined that according to brightness from high to low pixel ratio and when reaching the second pixel ratio threshold value, each Color Channel is right respectively Each second brightness value answered；If the first brightness value corresponding to any Color Channel is less than the first luminance threshold, and the second brightness value is more than the second luminance threshold Value, it is determined that be currently reversible-light shooting.
- 3. the method as described in claim 1, it is characterised in that described to determine pixel ratio threshold value corresponding to the current scene And after luminance threshold, in addition to：Face datection is carried out to the current scene；If it is determined that the current scene includes human face region, then the pixel ratio threshold value and the luminance threshold are adjusted It is whole.
- 4. method as claimed in claim 3, it is characterised in that the pixel ratio threshold value includes：The first picture in correspondence with each other Plain proportion threshold value, the first luminance threshold and the second pixel ratio threshold value, the second luminance threshold；It is described that the pixel ratio threshold value and the luminance threshold are adjusted, including：Reduce the first pixel ratio threshold value, or increase by first luminance threshold；Increase the second pixel ratio threshold value, or increase by second luminance threshold.
- 5. the method as described in claim 1-4 is any, it is characterised in that described to be obtained using high dynamic range images screening-mode The high dynamic range images of the current scene are taken, including：Each color channel histograms according to corresponding to the current scene, determine exposure bias value corresponding to current scene；Normal exposure image, under-exposure image and overexposure figure corresponding to the current scene are obtained based on the exposure bias value Picture；The normal exposure image, under-exposure image and overexposure light image are subjected to fusion treatment, generate the current scene High dynamic range images.
- 6. the method as described in claim 1-4 is any, it is characterised in that the letter of the brightness according to corresponding to the current scene Breath, determines pixel ratio threshold value and luminance threshold corresponding to the current scene, including：According to default luminance threshold and the corresponding relation of brightness range, it is determined that object brightness model corresponding with the current scene Enclose；According to default brightness range and pixel ratio threshold value and the corresponding relation of luminance threshold, it is determined that with the object brightness model Pixel ratio threshold value and luminance threshold corresponding to enclosing.
- A kind of 7. high dynamic range image acquisition device, it is characterised in that including：First acquisition module, for from automatic exposure control system, obtaining monochrome information corresponding with current scene；First determining module, for the monochrome information according to corresponding to the current scene, determine picture corresponding to the current scene Plain proportion threshold value and luminance threshold；Second determining module, for determining each color channel histograms corresponding to the current scene, wherein, each Color Channel is straight Side's figure includes the different brightness under each Color Channel and the corresponding relation of pixel ratio；3rd determining module, for pixel ratio threshold value, luminance threshold and each Color Channel according to corresponding to the current scene Histogram, determine whether as reversible-light shooting；Second acquisition module, for when it is determined that being currently reversible-light shooting, utilizing high dynamic range images screening-mode to obtain institute State the high dynamic range images of current scene.
- 8. device as claimed in claim 7, it is characterised in that the pixel ratio threshold value includes：The first picture in correspondence with each other Plain proportion threshold value, the first luminance threshold and the second pixel ratio threshold value, the second luminance threshold；3rd determining module, including：Statistic unit, for the direction according to brightness from low to high and from high to low respectively, each Color Channel is counted successively The sum of pixel ratio in histogram；First determining unit, for determine according to brightness from low to high pixel ratio and reach the first pixel ratio threshold value When, each first brightness value corresponding to each Color Channel difference；Second determining unit, for determine according to brightness from high to low pixel ratio and reach the second pixel ratio threshold value When, each second brightness value corresponding to each Color Channel difference；3rd determining unit, if it is less than the first luminance threshold for the first brightness value corresponding to any Color Channel, and second is bright Angle value is more than the second luminance threshold, it is determined that is currently reversible-light shooting.
- A kind of 9. terminal device, it is characterised in that including：Memory, processor and camera module；The camera module, for gathering the image under current scene；The memory, for storing executable program code；The processor, run and the executable program for reading the executable program code stored in the memory Program corresponding to code, for realizing the high-dynamic-range image acquisition method as described in claim 1-6 is any.
- 10. a kind of computer-readable recording medium, is stored thereon with computer program, it is characterised in that the computer program quilt The high-dynamic-range image acquisition method as described in claim 1-6 is any is realized during computing device.
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