CN102946513B - A kind of method, device and terminal starting filming apparatus high dynamic range function - Google Patents
A kind of method, device and terminal starting filming apparatus high dynamic range function Download PDFInfo
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Abstract
The invention discloses a kind of method starting filming apparatus high dynamic range function, comprise the following steps: the picture obtaining filming apparatus current scene; Calculate contrast and the brightness of described scenic picture; Judge whether described contrast and brightness are all greater than corresponding predetermined threshold value; In this way, then the high dynamic range function of described filming apparatus is started.Application the present invention can realize automatically opening according to photographed scene or closing HDR function, and make user not need to possess professional knowledge and just can make full use of HDR function in camera head, reduce photography threshold, raising Consumer's Experience, shoots high-quality photo.The invention also discloses the device for realizing described method and terminal.
Description
Technical field
The present invention relates to camera technique field, particularly relate to a kind of method, device and the terminal that start filming apparatus high dynamic range function.
Background technology
HDR (High Dynamic Range, high dynamic range) file is a kind of special graph file format, and high dynamic range refers to the reduced value between the brightest of a scene and most dark-part.The picture of a HDR form can record the brightness value of the actual scene considerably beyond 256 ranks.Its each pixel, except common RGB information, also has the intrinsic brilliance information of this point.The each pixel of common graphic file only has the tonal range of 0-255, and this is actually inadequate, and the difference of such as, tonal range between the luminous intensity of the sun and ater object brightness range is in other words just considerably beyond 256 ranks.Therefore, a common scenery picture on daytime, look that white clouds and the sun all may present same gray scale/brightness, it is all pure white, but in fact actual between white clouds and sun brightness is impossible, between them, difference in brightness is very large, but generic graphic file format can not record this actual conditions accurately.If the contrast of scene light is stronger, there will be brightness overexposure a slice extremely in vain or dark portion to owe to expose to the sun the situation of black one-tenth one.
Filming apparatus high-end at present, such as smart mobile phone, digital camera etc., can utilize HDR technology to address this problem.But HDR is as the synthetic technology of shooting multiple pictures, there is the problem that speed is slow, synthesis result precision reduces in some cases, and be not suitable for all scenes.During actual use, user oneself is needed to pick out this scene the need of unlatching HDR, then manual selection switch HDR.Clearly, most users are not Camera crews's (at all not knowing that HDR is what) of specialty, therefore are difficult to determine in which scene to be applicable to opening HDR, and which scene is not suitable for opening HDR, therefore, this function may without any meaning for amateur Camera crews.
Equally, user does not understand the concrete function of HDR, and may think merely that unlatching is relatively good, this is the custom of the people that the overwhelming majority is ignorant of, and therefore can open HDR function when not needing to open, and such result is just reduction of shooting speed and synthesis precision.In like manner, some people possible can not open at all, and such result just makes the scene that should open, and image quality is bad after the picture is taken.
Summary of the invention
The embodiment of the present invention provides a kind of method, device and terminal of opening HDR function in camera head, automatically open according to photographed scene for realizing or close HDR function, make user not need to possess professional knowledge and just can make full use of HDR function in camera head, reduce photography threshold, improve Consumer's Experience, shoot high-quality photo.
One aspect of the present invention, proposes a kind of method starting filming apparatus high dynamic range function, comprises the following steps: the picture obtaining current scene in filming apparatus; Calculate contrast and the brightness of described scenic picture; Judge whether described contrast and brightness are all greater than corresponding predetermined threshold value; In this way, then the high dynamic range function of described filming apparatus is started.Adopt this technical scheme, can photographed scene be detected, automatically open HDR function when needs, reduce photography threshold, improve Consumer's Experience.
In technique scheme, preferably, the value of described contrast or brightness is the one in the mean value of the contrast of each pixel of described scenic picture and surrounding pixel point or the value of brightness, variance yields or standard deviation.Adopt multiple method to calculate the value of contrast or brightness in this technical scheme, can adapt to multiple different photographed scene, the precision making to determine whether to open HDR function is higher, improves Consumer's Experience.
In technique scheme, preferably, the described step judging whether contrast and brightness are all greater than corresponding predetermined threshold value comprises further: judge whether described contrast is greater than preset first threshold value; In this way, judge whether described brightness is greater than default Second Threshold.In this technical scheme, consider that the calculating realizing contrast is more simple and the impact of HDR function on contrast is larger, therefore, first judge the value of contrast, if the value of contrast is greater than predetermined threshold value, whether the value of comparison brightness again, can open in the process of HDR function in decision and reduce amount of calculation, improve reaction speed.。
In technique scheme, preferably, if described contrast is not more than preset first threshold value or described brightness is not more than default Second Threshold, then close high dynamic range function.This technical scheme closes HDR function when not satisfying condition, and user can be avoided to open when not opening this function.
In technique scheme, preferably, described preset first threshold value is according to historical statistical data setting or according to described contrast adaptive setting.In this technical scheme, first threshold can be set according to historical statistical data, also according to the contrast adaptive setting first threshold in current shooting, this technical scheme can be adopted, better can set first threshold to determine whether to carry out brightness contrast.
In technique scheme, preferably, described default Second Threshold is according to historical statistical data setting or according to described brightness adaptive setting.In this technical scheme, Second Threshold can be set according to historical statistical data, also according to the brightness adaptive setting Second Threshold in present filming scene, this technical scheme can be adopted, better can set Second Threshold to determine whether to need to open HDR function.
In technique scheme, preferably, the step of described startup high dynamic range function comprises further: when meeting entry condition, described filming apparatus starts high dynamic range function automatically; Or when meeting entry condition, provide the information of opening high dynamic range function, and receive user really accept one's fate make time, start the high dynamic range function of described filming apparatus.Adopt this technical scheme, it is automatically open HDR function or provide to open prompting by user's initiatively unlatching that user can be selected, and adds the flexibility of this function.
Another aspect of the present invention, additionally providing a kind of device for realizing said method, comprising scene acquisition module, computing module, contrast module and high dynamic range function activation module, wherein, described scene acquisition module, for obtaining the picture of current scene in filming apparatus; Described computing module, for calculating contrast and the brightness of described scenic picture; Described contrast module, for judging whether described contrast and brightness are all greater than corresponding predetermined threshold value; Described high dynamic range function activation module, for starting the high dynamic range function of described filming apparatus.
In technique scheme, preferably, described contrast computing module or brightness calculation module are further used for, and the value of described contrast or brightness is the one in the mean value of the contrast of each pixel of described scenic picture and surrounding pixel point or the value of brightness, variance yields or standard deviation.
In technique scheme, preferably, described contrast module comprises contrast contrast unit and brightness contrast unit further, and wherein, described contrast contrast unit is for judging whether described contrast is greater than preset first threshold value; When contrast is greater than preset first threshold value, described in described brightness contrast unit judges, whether brightness is greater than default Second Threshold.
In technique scheme, preferably, described contrast contrast unit or brightness contrast unit also for, if described contrast is not more than preset first threshold value or described brightness is not more than default Second Threshold, then close high dynamic range function.
In technique scheme, preferably, also comprise first threshold computing module, for setting or preset first threshold value according to described contrast adaptive setting according to historical statistical data.
In technique scheme, preferably, also comprise first threshold memory module, for storing the first threshold that described first threshold computing module calculates.
In technique scheme, preferably, also comprise Second Threshold computing module, for setting according to historical statistical data or preset Second Threshold according to described brightness adaptive setting.
In technique scheme, preferably, also comprise Second Threshold memory module, for storing the Second Threshold that described Second Threshold computing module calculates.
In technique scheme, preferably, described HDR starts module and comprises backstage unlatching unit further or open Tip element, and wherein, unit is opened on described backstage, and during for meeting entry condition, described filming apparatus starts high dynamic range function automatically; Described unlatching Tip element, during for meeting entry condition, provides the information of opening high dynamic range function, and receive user really accept one's fate make time, start the high dynamic range function of described filming apparatus.
Another aspect of the present invention, also proposed a kind of terminal with HDR function, comprises the device described in above-mentioned arbitrary technical scheme.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart starting camera head high dynamic range functional method in the embodiment of the present invention;
Fig. 2 is the mobile terminal structure schematic diagram of application scenarios in the embodiment of the present invention;
Fig. 3 is the detail flowchart based on the embodiment of the method for mobile terminal in the embodiment of the present invention;
Fig. 4 is the structural representation starting camera head high dynamic range functional device in the embodiment of the present invention;
Fig. 5 is the structural representation of a kind of preferred device embodiment in the embodiment of the present invention;
Fig. 6 is the structural representation of another kind of preferred device embodiment in the embodiment of the present invention;
Fig. 7 is a kind of structural representation with the terminal of automatically opening HDR function in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
As shown in Figure 1, be the embodiment that the present invention starts filming apparatus high dynamic range functional method, comprise the following steps:
The picture of current scene in step 101, acquisition filming apparatus;
Step 102, the contrast calculating described scenic picture and brightness;
Step 103, judge whether described contrast and brightness are greater than predetermined threshold value;
Step 104, in this way, then start the high dynamic range function of described filming apparatus.
In said method embodiment, by the detection to light condition in scene, the knowledge that user does not understand exposure relevant judges the situation needing to use HDR, and helps user to open this function, even if also can be taken high-quality, Correct exposure and have the photo of suitable details.
The method can be applied on various filming apparatus, such as digital camera, mobile terminal etc. with camera.Mobile terminal 201 as shown in Figure 2, has HDR function, and be an application scenarios of the inventive method embodiment, this mobile terminal is provided with camera 202, and this camera 202 is with photoreceptor.
As shown in Figure 3, be applied in a specific embodiment on this mobile terminal for the present invention starts filming apparatus high dynamic range functional method, user carries out photograph taking by this mobile terminal, and the method for this startup high dynamic range function comprises the following steps:
The photoreceptor of step 301, unlatching mobile terminal camera;
Step 302, obtain the scenic picture of described photoreceptor perception;
Step 303, calculate the contrast of described scenic picture;
Step 304, judge whether described contrast is greater than preset first threshold value;
In this way, then go to step 305, as no, then go to step 306;
Step 305, calculate the brightness of described scenic picture;
Step 306, closedown HDR function;
Step 307, judge whether described brightness is greater than default Second Threshold;
In this way, then go to step 308, as no, then go to step 306;
Step 308, the high dynamic range function of described mobile terminal of starting.
In this embodiment, consider that the calculating realizing contrast is more simple and the impact of HDR function on contrast is larger, therefore, first judge the value of current scene picture contrast, if the value of contrast is greater than preset first threshold value in current scene picture, the then value of comparison brightness and the size of Second Threshold again, to make the decision of whether opening HDR function.Whether if the value of the contrast of current scene picture is less than preset first threshold value, then directly decision does not need to open HDR function, can open in the process of HDR function like this and reduce amount of calculation, improve reaction speed in decision.
In technique scheme, user opens camera, find a view in process at phase machine frame, the contrast of Current camera frame visual field Scene can be calculated in real time, digital picture exists with the form of bitmap (bitmap) on computers, bitmap is a rectangular lattice, and wherein every bit is called pixel (pixel), and pixel is the base unit in digital picture.The image of one width m × n size, the pixel do not waited by m × n shading value forms.The bright-dark degree that in digital picture, each pixel has identified by gray value (gray level).Generally the gray value of white is defined as 255, black gray value is defined as 0, and is divided into 256 grades by black equably to the shading value white.For black and white image, each pixel byte data represents, and in coloured image, each pixel need be stated by three byte datas.Coloured image can resolve into red (R), green (G), blue (B) three monochrome images, and any one color can be made up of these three kinds of blend of colors.In image procossing, the process of coloured image normally obtains by processing respectively its three monochrome images.
The computational methods of the value of scene contrast have following two kinds:
The first is the value of mean value as scenic picture contrast of the contrast calculating each pixel of scenic picture and surrounding pixel point, then compare with the first threshold preset, if be greater than first threshold, then calculate brightness value further, if be not more than first threshold, then close HDR function.As shown in form one, the contrast value of this pixel of the digitized representation in grid and surrounding pixel, under normal circumstances, a pixel and surrounding eight pixels compare, and for this situation, can adopt the method for calculating mean value.But this situation is not representative.
| 0 | 0 | 0 | 100 |
| 0 | 0 | 100 | 100 |
| 0 | 100 | 100 | 100 |
| 100 | 100 | 100 | 100 |
Form one
The second is in scenic picture, the contrast transition in other places is all smoother, but only have the contrast of any and surrounding contrast very large, as shown in form two, if now adopt mean value, then this block picture is certain to be skipped over, so need to adopt the variance yields of each pixel and surrounding pixel point contrast value or the value of standard deviation to contrast as result of calculation and first threshold, just can be judged whether more accurately to need to carry out brightness judgement.
| 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 100 |
Form two
The computational methods of brightness are identical with the computational methods of contrast, also be determine to adopt the mean value calculating each pixel and the brightness of surrounding pixel point as the brightness value of visual field picture according to the concrete light condition of visual field scene, or adopt the value of variance yields or standard deviation to compare as result of calculation and Second Threshold.
Along with the movement of camera lens, scenic picture is also changing at any time, and the calculating of therefore contrast and brightness is all real-time, and the value of whether opening contrast required for HDR function and brightness is all as the criterion to press the last result of calculation before camera shutter.
In technique scheme, the concrete numerical value of first threshold and Second Threshold can set according to historical statistical data, now need by user repeatedly the contrast value of shooting picture and brightness value carry out recording and adding up, the basis of this statistics sets applicable first threshold.Also can set according to the contrast self adaptation of current shooting visual field picture.
When meeting entry condition, mobile terminal can start high dynamic range function automatically, and such user just can take the photo of HDR form.Or determine whether open HDR function in order to user oneself can be allowed, mobile device can provide the information of whether opening high dynamic range function on a display screen, to make user understand, this scene is applicable to opening HDR function, finally makes a decision whether open this function by user.
As shown in Figure 4, be a kind of device embodiment of the present invention, comprise scene acquisition module 401, computing module 402, contrast module 403 and HDR and start module 404.
Scene acquisition module 401, for obtaining the picture of current scene in filming apparatus; Described computing module 402, for calculating contrast and the brightness of described scenic picture; Described contrast module 403, for judging whether described contrast and brightness are greater than predetermined threshold value; Described HDR starts module 404, for starting the high dynamic range function of described filming apparatus.
A kind of in the mean value of each for scenic picture pixel and the contrast of surrounding pixel point or the value of brightness, variance yields or standard deviation to spend or the value of brightness by calculating by computing module as a comparison.Then by contrast module, contrast or brightness are compared with the threshold value preset, respectively if be both greater than the threshold value preset respectively, then opening of device HDR function.
As shown in Figure 5, be a kind of preferred embodiment embodiment of the present invention, comprise scene acquisition module 501, for obtaining the scenic picture of the camera photoreceptor perception of filming apparatus; Described contrast computing module 502, for calculating the contrast of described scenic picture; Described contrast contrast module 503, for judging whether described contrast is greater than preset first threshold value; Described brightness calculation module 504, for calculating the brightness of described scenic picture; Described brightness contrast module 505, for judging whether described brightness is greater than default Second Threshold; Described HDR starts module 506, for starting the high dynamic range function of described filming apparatus; First threshold computing module 507, for setting or preset first threshold value according to described contrast adaptive setting according to historical statistical data; Second Threshold computing module 508, for setting according to historical statistical data or preset Second Threshold according to described brightness adaptive setting.
As shown in Figure 6, as the preferred technical scheme of one, first threshold memory module 507 ' can also be comprised, for storing the first threshold calculated; Second Threshold memory module 508 ', for storing the Second Threshold calculated.HDR starts module 508 and can comprise backstage unlatching unit further or open Tip element, and wherein unit is opened on backstage, and during for meeting entry condition, filming apparatus starts high dynamic range function automatically; Opening Tip element, during for meeting entry condition, providing the information of opening high dynamic range function.
In addition, as shown in Figure 7, embodiments of the invention also proposed one and have HDR function terminal 701, comprise the device 702 described in technique scheme.Apply this device to take pictures, when light condition meets unlatching HDR function, automatically can open or point out user to open HDR function, making user obtain better experience.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. start a method for filming apparatus high dynamic range function, it is characterized in that, comprising:
Obtain the picture of current scene in filming apparatus;
For pixel each in described scenic picture, this pixel and surrounding pixel point are compared;
According to the comparative result of pixel each in described scenic picture and surrounding pixel point, calculate contrast and the brightness of described scenic picture; The value of described contrast or brightness is the one in the mean value of the contrast of each pixel and surrounding pixel point or the value of brightness in described scenic picture, variance yields or standard deviation;
Judge whether described contrast is greater than preset first threshold value;
In this way, then judge whether described brightness is greater than default Second Threshold;
In this way, then the high dynamic range function of described filming apparatus is started;
If described contrast is not more than preset first threshold value or described brightness is not more than default Second Threshold, then close high dynamic range function.
2. the method for claim 1, is characterized in that, described preset first threshold value is according to historical statistical data setting or according to described contrast adaptive setting; Described default Second Threshold is according to historical statistical data setting or according to described brightness adaptive setting.
3. the method for claim 1, is characterized in that, the step of described startup high dynamic range function comprises:
The high dynamic range function of the described filming apparatus of automatic startup; Or
Provide the information of opening high dynamic range function, and receive user really accept one's fate make time, start the high dynamic range function of described filming apparatus.
4. start a device for filming apparatus high dynamic range function, comprise scene acquisition module, computing module, contrast module and high dynamic range function activation module, wherein,
Described scene acquisition module, for obtaining the picture of current scene in filming apparatus;
Described computing module, for for pixel each in described scenic picture, compares this pixel and surrounding pixel point; According to the comparative result of pixel each in described scenic picture and surrounding pixel point, calculate contrast and the brightness of described scenic picture; The value of described contrast or brightness is the one in the mean value of the contrast of each pixel and surrounding pixel point or the value of brightness in described scenic picture, variance yields or standard deviation;
Described contrast module, for judging whether described contrast and brightness are all greater than corresponding predetermined threshold value; Described contrast module comprises contrast contrast unit and brightness contrast unit, and wherein, described contrast contrast unit, for judging whether described contrast is greater than preset first threshold value; Described brightness contrast unit, for judging whether described brightness is greater than default Second Threshold;
Described high dynamic range function activation module, for starting the high dynamic range function of described filming apparatus;
Described in described contrast contrast unit judges, contrast is not more than brightness described in preset first threshold value or described brightness contrast unit judges and is not more than default Second Threshold, then described high dynamic range function activation module closes high dynamic range function.
5. device as claimed in claim 4, it is characterized in that, described device also comprises:
First threshold computing module, for setting or preset first threshold value according to described contrast adaptive setting according to historical statistical data;
Second Threshold computing module, for setting according to historical statistical data or preset Second Threshold according to described brightness adaptive setting.
6. device as claimed in claim 4, it is characterized in that, described device also comprises:
First threshold memory module, for storing the first threshold that described first threshold computing module calculates;
Second Threshold memory module, for storing the Second Threshold that described Second Threshold computing module calculates.
7. device as claimed in claim 4, is characterized in that, described high dynamic range function activation module comprises backstage and opens unit or open Tip element, wherein,
Unit is opened on described backstage, for automatically starting high dynamic range function; Or
Described unlatching Tip element, for providing the information of opening high dynamic range function, and receive user really accept one's fate make time, start the high dynamic range function of described filming apparatus.
8. a terminal, has high dynamic range function, it is characterized in that, comprises the device described in any one of claim 4 to 7.
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