CN104717430B - Image processing method and image processing apparatus - Google Patents
Image processing method and image processing apparatus Download PDFInfo
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- CN104717430B CN104717430B CN201310687003.2A CN201310687003A CN104717430B CN 104717430 B CN104717430 B CN 104717430B CN 201310687003 A CN201310687003 A CN 201310687003A CN 104717430 B CN104717430 B CN 104717430B
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Abstract
A kind of image processing apparatus includes an image unit, a control unit, an image process unit and a storage element.Image unit obtains one first image.Control unit adjusts the exposure value of image unit, to control the contrast value of the dark portion average brightness value of the first image and the first image.Image process unit couples with image unit and storage element, and the first algorithm being stored according to the first image and one in storage element produces one second image, and the second algorithm being stored according to the first image and one in storage element produces one the 3rd image.Image process unit produces one the 4th image according to the brightness value of the first image, the brightness value of the second image, the brightness value of the 3rd image and a weight array.The present invention can avoid the image because shooting multiple different exposure values, and the problem of the committed memory space of generation, and avoid because multiple presentation contents are inconsistent, and cause the incomplete problem of image of output, and reach to produce in real time simultaneously and intend high dynamic-range image.
Description
Technical field
The present invention intends high dynamic on a kind of image processing method and image processing apparatus especially in regard to a kind of obtain in real time
Image processing method and image processing apparatus.
Background technology
In recent years, photography has turned into one of important interest of modern.The either built-in camera of notebook computer, flat board
The built-in camera of computer or the built-in camera of mobile phone, people are for wanting to take whenever and wherever possible the serious hope of fine things increasingly
It is high.However, the environment at not any moment is all adapted to take pictures.Insufficient light, backlight or ambient brightness arround are height
Contrast (part in environment simultaneously with high brightness and extremely low brightness), captured image out will be limited to camera sheet
The hardware of body, and original appearance originally can not be showed.
In the prior art, high dynamic range imaging (High dynamic range；HDR it is) for realizing than common number
Word image technique more makes a kind of technology of optical dynamic range public, and it is shot by a variety of different exposure values and produces multiple
Image, then the mode that the image of these different exposure values is merged, and export the image of an optimization.However, multiple shadows
As in addition to taking more storage area, because high dynamic range imaging need to use multiple exposure values, will so reduce
The speed of image procossing.In addition, mode used by high dynamic range imaging, is with different exposure values, to same in different time
One place is shot.If not arranging in pairs or groups foot stool or other fixing devices during shooting, it is very easy to that multiple presentation contents occur
Inconsistent, the image for causing fusion to export has ghost or the incomplete problem of picture.
The content of the invention
The present invention provides a kind of image processing method, for image processing apparatus.Image processing apparatus include image unit,
Control unit, image process unit and storage element.Image processing method comprises the following steps：One the is obtained by image unit
One image, wherein control unit adjust the exposure value of image unit, to control the dark portion average brightness value and first of the first image
The contrast value of image；Image process unit produces one the according to the first image and one first algorithm that is stored in storage element
Two images；Image process unit produces one the 3rd image according to the first image and one second algorithm being stored in storage element；
And image process unit is according to the brightness value of the first image, the brightness value of the second image, the brightness value of the 3rd image and a power
Principal matrix row produce one the 4th image.
The present invention also provides a kind of image processing apparatus, including an image unit, a control unit, an image process unit
An and storage element.Image unit obtains one first image.Control unit couples with image unit, and adjusts the exposure of image unit
Light value, to control the contrast value of the dark portion average brightness value of the first image and the first image.Storage element and control unit coupling
Connect.Image process unit couples with image unit, and according to the first image and one first algorithm being stored in storage element production
Raw one second image, and produce one the 3rd image according to the first image and one second algorithm being stored in storage element.Image
Processing unit is according to the brightness value of the first image, the brightness value of the second image, the brightness value of the 3rd image and weight array production
Raw one the 4th image.
Therefore, the image of the invention that can be avoided because shooting multiple different exposure values, and the committed memory space of generation
Problem, and avoid because multiple presentation contents are inconsistent, and cause the incomplete problem of image of output, and reach real-time production simultaneously
It is raw to intend high dynamic-range image.
Brief description of the drawings
Fig. 1 is a kind of schematic appearance of image processing apparatus of one embodiment of the invention.
Fig. 2 is a kind of internal structure schematic diagram of image processing apparatus of one embodiment of the invention.
Fig. 3 is a kind of flow chart of image processing method of one embodiment of the invention.
Embodiment
Hereinafter with reference to correlative type, illustrate a kind of image processing method and image procossing according to present pre-ferred embodiments
Device, wherein identical element will be illustrated with identical reference marks.
Fig. 1 is the schematic appearance of the image processing apparatus of an embodiment of one embodiment of the invention.It refer to Fig. 1 institutes
Show, in the present embodiment, image processing apparatus 11 is the tablet personal computer for being equipped with image unit 111.So, the present invention not as
Limit.In other embodiment aspects, image processing apparatus be alternatively notebook computer, intelligent mobile phone, multimedia video and audio device,
Portable electronic game device or other portable electronic devices for being equipped with camera lens.In addition, image processing apparatus also may be used
By be for monitoring monitoring device or save from damage camera chain fixed setting in the form of electronic installation or system.
Fig. 2 is refer to, it is a kind of internal structure schematic diagram of image processing apparatus of one embodiment of the invention.At image
Reason device 21 includes an image unit 211, a control unit 212, an image process unit 213 and a storage element 214.Shooting
Unit 211 obtains one first image according to the operation of user.Control unit 212 couples with image unit 211, and adjusts shooting
The exposure value (Exposure Value) of unit 211, to control pair of the dark portion average brightness value of the first image and the first image
Compare angle value.
Specifically, control unit 212 controls the exposure value of image unit 211, so that the acquired by image unit 211
The dark portion average brightness value of one image makes the contrast value of the first image between image unit 211 between 30 to 40
Between the 80% to 90% of built-in contrast value.Wherein, it is beneficial to through the first image caused by above-mentioned parameter follow-up
Image procossing.
Image process unit 213 couples with image unit 211, storage element 214 and control unit 212 and image processing list
Member 213 couples.Image process unit 213 is according to the first image acquired by image unit 211 and is stored in storage element 214
One first algorithm produce one second image, and according to the first image and one second algorithm that is stored in storage element 214
Produce one the 3rd image.In addition, image process unit 213 is by according to the brightness value of the first image, the brightness value of the second image, the
The brightness value of three images and a weight array produce one the 4th image.In the present embodiment, image process unit 213 is according to storage
The first algorithm in storage element 214 heightens the brightness of each pixel of the first image, and produces the second image, and image processing
Unit 213 heightens the contrast of the first image according to the second algorithm being stored in storage element 214, particularly heightens region picture
The contrast of element, to produce the 3rd image.
It is to be carried out with control unit 212 and image process unit 213 for two separately positioned elements in the present embodiment
Illustrate, but in other embodiment aspects, control unit 212 and image process unit 213 by can according to circuit layout and set
Count and be integrated into a solid memder.
In addition, in the present embodiment, weight array is the default-weight array for being stored in storage element 214.Wherein, weigh
Principal matrix row can be one group of numerical value being stored in storage element 214, be, for example,：(1/3,1/3,1/3).Specifically,
The quantity of stored weight array can be according to the demand of product and the design of image procossing in storage element 214, and stores one
Group weight array or multigroup weight array.When storing multigroup weight array in storage element 214, image process unit
213 by can be according to the difference of exposal model, and selects different weight arrays.For example, image processing apparatus 21 can more have
There is user's operation interface 215, it can provide a variety of screening-modes and be selected to user, be, for example,：Night, cigarette
Fiery pattern, outdoor daylight mode or outdoor artificial light source pattern etc., and the corresponding foregoing different screening-modes of storage element 214
And there is different weight arrays.When user selects one of which screening-mode, image process unit 213 i.e. can be from storage
Corresponding weight array is chosen in unit 214.In addition, image processing apparatus 21 can also include a sensing unit, (figure does not show
Show), it can sense the condition of external environment condition, the e.g. brightness of prospect and the brightness of background, and the result sensed is provided
To image process unit 213, so that image process unit 213 voluntarily chooses one group of weight array according to sensing result.In addition,
In other embodiment aspects, weight array is alternatively the weight array of an outside input, that is to say, that user, which can pass through, to be used
Person's operation interface 215 inputs required weight array, so that user can adjust the effect of image according to its demand and hobby.
Then, Fig. 3 flow chart is refer to, and is arranged in pairs or groups shown in Fig. 2, to illustrate the image procossing of present pre-ferred embodiments
Method, it can be applied to above-mentioned image processing apparatus 21.The step of image processing method, includes step S01~S04.Step
S01 obtains one first image by image unit 211, and wherein control unit 212 adjusts the exposure value of image unit 211, with control
Make the dark portion average brightness value of the first image and the contrast value of the first image.
Specifically, control unit 212 controls the exposure value of image unit 211, so that the dark portion of the first image is average bright
Angle value makes the contrast value of the first image between the 80% of the built-in contrast value of image unit 211 between 30 to 40
To between 90%.In the present embodiment, the photographic parameter of image unit 211 is controlled through control unit 212, is beneficial to so as to produce
First image of successive image processing.
Step S02 is produced by image process unit 213 according to the first image and the first algorithm being stored in storage element 214
Raw second image.In the present embodiment, after image unit 211 obtains preferable first image, it will it is temporarily stored up
Exist in storage element 214.Simultaneously, image process unit 213 will pass through the first algorithm at the first image
Reason.Wherein, image process unit 213 will heighten the brightness of each pixel of the first image according to the first algorithm, and produce the second shadow
Picture.On the implementation, image process unit 213 can be according to the original luminance value of each pixel of the first image, and has different proportion
Adjustment, e.g. when the original brightness of pixel is equal to or less than a default value, then carry out the fortune of first function (function)
Calculate, give higher brightness adjustment ratio, and when the original brightness of pixel is greater than this default value, then transported using second function
Calculate, give relatively low brightness adjustment ratio.In addition, the first foregoing algorithm can also be the original for each pixel of the first image
Beginning brightness all uses identical operation function, to heighten the brightness of each pixel.In the present embodiment, the first algorithm can be for example width
Dynamic range is imaged (Wide dynamic range；WDR) algorithm, and handle through image process unit 213 and caused second
Image can be temporarily stored into storage element 214.
Step S03 is by image process unit 213 according to the first image and one second algorithm being stored in storage element 214
Produce one the 3rd image.In the present embodiment, image process unit 213 will be by the second algorithm at the first image
Reason, to heighten the contrast of the first image, the region contrast of (reinforcing) first image is particularly heightened, and produce the 3rd shadow
Picture.Wherein, image process unit 213 can analyze the brightness of the prospect of the first image and the brightness of background, and adjust prospect brightness
With the ratio of background luminance, and the second algorithm can be for example partial histogram equalization (Contrast-Limited Adaptive
Histogram Equalization；CLAHE) algorithm, and handled through image process unit 213 and caused 3rd image can
It is temporarily stored into storage element 214.Now, the number such as the first image, the second image and the 3rd image will be stored in storage element 214
According to.
Step S04 is by image process unit 213 according to the brightness value of the first image, the brightness value of the second image, the 3rd shadow
The brightness value of picture and a weight array produce one the 4th image.In the present embodiment, image process unit 213 by the first image,
Second image and the 3rd image extract from storage element 214, and foundation is stored in the weight array of storage element 214,
The brightness of brightness, the second image to the first image and the brightness of the 3rd image carry out weight calculation, after obtaining three's mixing
The 4th image.For example, when the weight array for being stored in storage element 214, it is, for example, (1/3,1/3,1/3), and assume
The brightness value of first image be the brightness value of the 40, second image be 100 and the 3rd the brightness value of image be 80, via foregoing power
After principal matrix column count, the brightness value of the 4th image is then 70 (40 × 1/3+100 × 1/3+80 × 1/3=70).Only, it is described above
Numerical value and calculation be to be carried out for corresponding pixel (Pixel) between the first image, the second image and the 3rd shade
Computing.By pixel all in each image after above-mentioned weight calculation, you can the 4th image is produced, and the 4th image namely passes through
The handled plan high dynamic-range image completed of image processing method described in the present embodiment.In addition, the 4th image will can pass through
Image process unit 213 is exported to a display unit (figure do not show), is viewed and admired or is confirmed to provide user.Implement in others
In aspect, weight array by can be an outside input weight array, that is to say, that user can pass through user operation interface
Weight array needed for 215 inputs.
In addition, via caused 4th image after weight calculation, the adjustment of other thin portions can will be again carried out, such as：It is soft
Change processing, Edge contrast or other image procossings, make the image of final output more perfect, and export to display unit.So, it is preceding
The further image adjustment stated or parameter adjust number can be according to the situation of actual use, and have different extra process, Yu Benfa
It is not limited in bright.
It need to remark additionally, in above-mentioned step, step S02 and step S03 are in the limit that sequencing is had no in implementation
System.In other words, step S02 can be first carried out before step S03 or step S03 can prior to step S02 perform or step S02 with
Step S03 can be carried out simultaneously.It is to be with step S02 and step S03 in the present embodiment to accelerate the speed of image procossing
Carry out simultaneously exemplified by.
In summary, it is to pass through image unit because of a kind of image processing method and image processing apparatus according to the present invention
One first image, and the exposure value of control unit adjustment image unit are obtained, to control the dark portion average brightness value of the first image
And first image contrast value, thus the present invention image processing method and image processing method only need shooting one it is original
Image, and raw video is that have preferable treatment conditions, therefore the image because shooting multiple different exposure values can be avoided, and
The problem of producing committed memory space, and avoid because multiple presentation contents are inconsistent, and cause the image of output is incomplete to ask
Topic, and reach to produce in real time simultaneously and intend high dynamic-range image.
Although the present invention is disclosed above with embodiment, so it is not limited to the present invention, any art
Middle tool usually intellectual, without departing from the spirit and scope of the present invention, when a little change and retouching can be made, thus it is of the invention
Protection domain when being defined depending on those as defined in claim.
Claims (8)
1. a kind of image processing method, for image processing apparatus, above-mentioned image processing apparatus includes image unit, control list
Member, image process unit and storage element, above-mentioned image processing method comprise the following steps：
First image is obtained by above-mentioned image unit, wherein above-mentioned control unit adjusts the exposure value of above-mentioned image unit, with
Control the dark portion average brightness value of above-mentioned first image and the contrast value of above-mentioned first image；
Above-mentioned image process unit is heightened above-mentioned according to above-mentioned first image and the first algorithm being stored in above-mentioned storage element
The brightness of each pixel of first image, to produce the second image；
Above-mentioned image process unit is heightened above-mentioned according to above-mentioned first image and the second algorithm being stored in above-mentioned storage element
The region contrast of first image, to produce the 3rd image；And
Above-mentioned image process unit is according to the brightness value of above-mentioned first image, the brightness value of above-mentioned second image, above-mentioned 3rd shadow
The brightness value and weight array of picture produce the 4th image.
2. image processing method according to claim 1, wherein above-mentioned control unit adjusts the exposure of above-mentioned image unit
Value, makes the dark portion average brightness value of above-mentioned first image between 30 to 40, and the contrast value of above-mentioned first image is situated between
Between the 80% to 90% of the built-in contrast value of above-mentioned image unit.
3. image processing method according to claim 1, wherein above-mentioned weight array is to be stored in above-mentioned storage element
Default-weight array.
4. image processing method according to claim 1, wherein the weight array that above-mentioned weight array is an externally input.
5. image processing method according to claim 1, further comprising the steps of：
Softening processing is carried out to above-mentioned 4th image.
6. image processing method according to claim 1, further comprising the steps of：
Processing is sharpened to above-mentioned 4th image.
7. a kind of image processing apparatus, including：
Image unit, obtain the first image；
Control unit, coupled with above-mentioned image unit, and adjust the exposure value of above-mentioned image unit, to control above-mentioned first image
Dark portion average brightness value and above-mentioned first image contrast value；
Storage element, coupled with above-mentioned control unit；And
Image process unit, couple with above-mentioned image unit and above-mentioned storage element, and according to above-mentioned first image and be stored in
The first algorithm in above-mentioned storage element heightens the brightness of each pixel of above-mentioned first image, to produce the second image, and foundation
Above-mentioned first image and the second algorithm being stored in above-mentioned storage element heighten the region contrast of above-mentioned first image, with production
Raw 3rd image；
Wherein above-mentioned image process unit is according to the brightness value of above-mentioned first image, the brightness value of above-mentioned second image, above-mentioned
The brightness value and weight array of three images produce the 4th image.
8. image processing apparatus according to claim 7, wherein above-mentioned control unit adjusts the exposure of above-mentioned image unit
Value, makes the dark portion average brightness value of above-mentioned first image between 30 to 40, and the contrast value of above-mentioned first image is situated between
Between the 80% to 90% of the built-in contrast value of above-mentioned image unit.
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| CN101841631A (en) * | 2009-03-20 | 2010-09-22 | 微星科技股份有限公司 | Shadow exposure compensation method and image processing device using same |
| CN102905058A (en) * | 2011-07-28 | 2013-01-30 | 三星电子株式会社 | Apparatus and method for generating high dynamic range image from which ghost blur is removed |
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| TWI464706B (en) * | 2009-03-13 | 2014-12-11 | Micro Star Int Co Ltd | Dark portion exposure compensation method for simulating high dynamic range with single image and image processing device using the same |
| US8508632B2 (en) * | 2010-10-15 | 2013-08-13 | Altek Corporation | Image processing method of obtaining a high dynamic range image |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101841631A (en) * | 2009-03-20 | 2010-09-22 | 微星科技股份有限公司 | Shadow exposure compensation method and image processing device using same |
| CN102905058A (en) * | 2011-07-28 | 2013-01-30 | 三星电子株式会社 | Apparatus and method for generating high dynamic range image from which ghost blur is removed |
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