CN101510954B - Imaging device capable of restraining image fog and method for restraining image fog - Google Patents
Imaging device capable of restraining image fog and method for restraining image fog Download PDFInfo
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- CN101510954B CN101510954B CN2008100059141A CN200810005914A CN101510954B CN 101510954 B CN101510954 B CN 101510954B CN 2008100059141 A CN2008100059141 A CN 2008100059141A CN 200810005914 A CN200810005914 A CN 200810005914A CN 101510954 B CN101510954 B CN 101510954B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000003384 imaging method Methods 0.000 title claims description 23
- 230000000452 restraining effect Effects 0.000 title 2
- 238000012545 processing Methods 0.000 claims description 38
- 238000009499 grossing Methods 0.000 claims description 16
- 230000035939 shock Effects 0.000 claims description 13
- 230000008030 elimination Effects 0.000 claims description 8
- 230000005764 inhibitory process Effects 0.000 claims description 7
- 239000011435 rock Substances 0.000 claims description 5
- 238000003379 elimination reaction Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 238000005070 sampling Methods 0.000 abstract 2
- 230000007246 mechanism Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
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Abstract
The invention relates to a method used for prohibiting image fog, which is applied to a photoing mode in which time of exposure is set by a sampling image device is longer than a safety shutter, the steps thereof comprise that: at first, a long exposure image in a shutter at present and a short exposure image which is shorter or equal to the safety shutter are retrieved at a same scene, and during the process of retrieving of the long exposure image, a shaking orbit signal is sampled by the sampling image device; then, an operation process is executed to carry out a smooth treatment onto the short exposure image and by using the auxiliary operation of the shaking orbit signal, an image point measuring scale is produced; at last, a multiplication is carried out to the long exposure image and the image point measuring scale to resume the long exposure image to form an output image. Thereby, under the photoing mode in which the time of exposure is longer than the safety shutter, original definition of the long exposure image is resumed by the assistance of the short exposure image.
Description
Technical field
The present invention relates to a kind of image-taking device, be meant a kind of method that under the long time for exposure, has the image-taking device of inhibition image fog and suppress image fog especially.
Background technology
Quick growth along with the digital camera technology, the feasible technology of the image fog that the camera vibrations are caused that prevents also just comes into one's own day by day, the technology of the anti-hand shake of digital camera at present is divided into two kinds of mechanism haply, is respectively the anti-hand shake of optics sensing mechanism and software compensation mechanism.
The principle of optics sensing mechanism mainly is to handle from camera lens and photosensory assembly (CCD), compensates rocking that camera itself caused to come the correction of controls lens or photosensory assembly by the sensing result of shock sensor.Wherein aspect the camera lens control: the principle that it utilizes eyeglass to float, see through the skew of shock sensor sense shock, and then by after the vibrations correction assembly calculating side-play amount, do correction on the optical axis to drive eyeglass, allow picture keep stable, such advantage is that the image quality of take is better, but the effect of anti-hand shake and not obvious (because the space that eyeglass can be moved is little).And aspect the photosensory assembly control: it is to see through shock sensor to come the sense shock skew equally, and utilize the floating principle of moving of machinery mount, to offset the image fog that is caused in the vibrations process by the position correction of adjusting photosensory assembly, this anti-hand shake effect is than coming well by camera lens control, but this design can allow the image quality of taking relatively poor, the mechanism of the anti-hand shake of this class simultaneously must cooperate the photosensory assembly of higher picture element just practical, otherwise it is stable but image quality is blured loose situation picture to occur.
Yet the anti-hand shake technology of above-mentioned optics sensing mechanism generally only is applied on the camera of higher-order owing to mechanism's complexity and expensive price.And the camera of lower-order light and thin type is based on considering on mechanism and the cost that optics sensing mechanism is obviously also inapplicable, so the generation of present modal software compensation mechanism (being commonly called as the anti-hand shake of electronic type) is also just arranged.
And the cardinal principle of software compensation mechanism is, the track that utilizes shock sensor to come mobile camera moving in the records photographing process or rock recovers to handle to provide information to carry out image, forms the reprocessing skill that auxiliary camera is taken individual image.But generally the reprocessing skill of individual image can cause different image to recover quality under different mobile degree, and image recovers that quality also can be subjected to The noise and makes that the actual effect of the image that recovers is unsatisfactory.Moreover, because aspect the reprocessing skill, general point spread function (the Point SpreadFunction that only utilizes estimation, PSF) and taken fuzzy image restore sharp image, so because available information is few, so need dependence complicated algorithm and long computing can reconstruct image more clearly.Therefore, still can improve further aspect the anti-hand shake function of present digital camera and the usefulness.
Summary of the invention
In view of this, technical problem to be solved by this invention is, do not needing to change significantly under the hardware structure of digital camera, see through the improvement control of firmware, assist comparison and computing with the point spread function (Point Spread Function) that utilizes long exposed image, short exposure image and estimation simultaneously.By this, to reach the shooting under the long time for exposure, suppress image fog efficiently and recover the purpose of the definition of fuzzy image.
In order to achieve the above object, according to a scheme proposed by the invention, provide a kind of tool to suppress the image-taking device of image fog, be under the screening-mode of a time for exposure greater than a safety shutter, suppress image fog, and this image-taking device comprises: an image acquisition unit, a shock sensor and a processing unit.Wherein, image acquisition unit receives one and takes signal to capture an at present fast student first image and second image smaller or equal to this safety shutter.Shock sensor then is to be used for writing down image-taking device one to rock the track signal during first image exposure, and processing unit is in order to produce this shooting signal, and carry out an operation program and come this second image is carried out smoothing processing, and then the auxiliary operation that utilizes the vibrating locus signal is estimated and a point spread function, and utilize this point spread function with this second image of acquisition originally second image after this smoothing processing relatively, to produce an imaging point scale.In addition, processing unit carries out a certain operations to recover to form an image output with first image and this imaging point scale again.By this, under the screening-mode of time for exposure greater than this safety shutter, being able to auxiliary so that first image is suppressed image fog by second image, is the image more clearly of first image and make this image output.
In order to achieve the above object, according to another program proposed by the invention, a kind of method that suppresses image fog is provided, be applied to the screening-mode of a time for exposure greater than a safety shutter, its step comprises: at first, capture an at present fast student first image and second image smaller or equal to this safety shutter, write down the vibrating locus signal of image-taking device during first image exposure simultaneously.Moreover carry out an operation program so that second image is carried out smoothing processing, and the auxiliary operation that utilizes the vibrating locus signal is estimated and a point spread function, and utilize this point spread function with this second image of acquisition originally second image after this smoothing processing relatively, to produce an imaging point scale.At last, first image and this imaging point scale are carried out a certain operations, first image is recovered to form an image output.By this, under the screening-mode of this time for exposure, be able to auxiliary so that this first image is suppressed image fog by this second image, and make this image output be image clearly greater than this safety shutter.
Above general introduction and ensuing detailed description and accompanying drawing all are to reach mode, means and the effect that predetermined purpose is taked in order to further specify the present invention.And relevant other purpose of the present invention and advantage, will follow-up explanation and graphic in set forth.
Description of drawings
Fig. 1 suppresses the embodiment calcspar of the image-taking device of image fog for tool of the present invention; And
Fig. 2 suppresses the embodiment flow chart of the method for image fog for the present invention.
The diagrammatical symbol explanation
Image-taking device 1
Push-button unit 13
Mnemon 16
Embodiment
Please refer to Fig. 1, suppress the embodiment calcspar of the image-taking device of image fog for tool of the present invention.As shown in the figure, the invention provides a kind of image-taking device 1, it comprises: an image acquisition unit 11, a processing unit 12, a push-button unit 13, a buffer unit 14, a shock sensor 15 and a mnemon 16.And image-taking device 1 of the present invention is under the screening-mode of a time for exposure greater than a safety shutter, can suppress the function of image fog automatically, producing the shooting effect of anti-hand shake, and allows the user be obtained the image of more clear and few noise.Wherein so-called safety shutter then is different according to the image-taking device 1 of different designs, generally is for example to be the shutter of 1/60 second or 1/30 second.That is to say, when user's use was taken greater than the time for exposure of safety shutter, just might be easier to photograph the fuzzy image that influenced by the hand shake because of the time for exposure is long.
The setting of supposing a present shutter of image-taking device 1 is greater than safety shutter, so can meet the condition that suppresses image fog when the user takes.At this moment, image acquisition unit 11 be receive one take signal after, just can be automatically in capturing at present the student's first image and second image smaller or equal to safety shutter soon under with scene with the time.That is to say that first image that image acquisition unit 11 is captured loses burnt fuzzy image because shutter is big than safety shutter, the time for exposure is long so form one easily; And second image is because shutter is little than safety shutter, the time for exposure is shorter, and forms a sharp keen sharp image that is full of noise easily.In addition, be default value wherein for image-taking device 1 smaller or equal to the practical shutters size of safety shutter, and can change there is no in the present embodiment and limited according to the difference of practical application design.
And push-button unit 13 wherein is connection processing unit 12, is used for receiving pushing producing a trigger signals of user, and then makes processing unit 12 be exported this shooting signal after receiving trigger signals.Buffer unit 14 then is to be connected between image acquisition unit 11 and the processing unit 12, is used for keeping in first image and second image that image acquisition unit 11 is captured, and carries out access for processing unit 12.
And processing unit 12 mainly is to come second image is carried out smoothing processing in order to carry out an operation program.And described operation program can for example be the program of the long-pending computing (Convolution) of folding, being to be full of noise and sharp keen second image is clearly eliminated noise with script, and makes image comparatively level and smooth (but also can form the image that comparatively blurs).And then, processing unit 12 utilize again point spread function that the auxiliary operation of vibrating locus signal estimates with originally clearly second image relatively after this smoothing processing institute form second image that comparatively blurs, just can produce an imaging point scale (Point Scale Image), since relation between expression fuzzy image and the sharp image.
At last, processing unit 12 carries out a certain operations to recover to form an image output with first image and imaging point scale again, will originally be that long exposure and the first fuzzy image recover its definition just.And this certain operations is for example for pixel relative between first image and the imaging point scale is carried out point-to-point computing of multiplying each other in the present embodiment.Yet, before processing unit 12 carries out this certain operations, more can further earlier carry out an elimination program, this imaging point scale is carried out the processing of impurity elimination point and smoothing to the imaging point scale.
And mnemon 16 is connection processing unit 12, to be used for storing the processing unit 12 last image outputs of being exported more clearly.That is the user this time push take the image that can obtain.
Please refer to Fig. 2, suppress the embodiment flow chart of the method for image fog for the present invention.As shown in the figure, the invention provides a kind of method that suppresses image fog, be to set under the screening-mode of its time for exposure greater than safety shutter at image-taking device 1 to carry out, its step comprises: at first, at the same time between with first image that captures the present fast student under the scene and smaller or equal to second image (S201) of safety shutter.And also write down the vibrating locus signal (S202) of image-taking device 1 during first image exposure simultaneously.And above-mentioned owing to second image is short exposure image and is the sharp keen sharp image that is full of noise, therefore can further eliminate the noise (S203) of noise program (Noise Reduction) to reduce by second image.
Certainly, the performed elimination noise program of step (S203) can be considered the flow process of further eliminating noise, can be omitted in the practical application design.Because in following step, can carry out the long-pending operation program of folding second image is carried out smoothing processing (S205), eliminate noise and with the effect of image smoothing, so that become fuzzy but the image of few noise for clear and second video conversion that noise is more originally and when the long-pending operation program of folding carries out, promptly can form.
Next, in step (S205) afterwards, can be by the auxiliary operation of the vibrating locus signal that is write down, estimate the generation point spread function, and according to this point spread function with this second image originally relatively should be after smoothing processing second image, with generation imaging point scale (S207), and this is just in order to represent the relation between former sharp image and the fuzzy image.Then, comparatively accurate in order to allow the imaging point scale be able to, therefore more can further carry out the elimination program the imaging point scale is carried out the processing (S208) of impurity elimination point and smoothing.
So, relation by sharp image and fuzzy image in the imaging point scale, just can be further pixel relative between first image and this imaging point scale be carried out point-to-point computing of multiplying each other, smoothly first image is recovered to form image output (S209) clearly.And last image output be the user this time take the image that can obtain.By this, even if the user uses the time for exposure to take greater than the screening-mode of safety shutter, image-taking device 1 also can be by the assisting first image suppressed image fog of second image of automatic shooting, and then reach first image reduction is gone out the purpose of image output more clearly.
Subsidiary one carry be, being familiar with this operator should understand, the long-pending operation program of the folding in order to carry out smoothing processing described in the foregoing description, point spread function by vibrating locus generation that signal is estimated, and the elimination program that the imaging point scale is carried out all only is wherein an example, also is to adopt other strategy to realize certainly.
In sum, tool of the present invention suppresses the image-taking device of image fog and suppresses the method for image fog, mainly is that the point spread function that utilizes long exposed image, short exposure image and estimation to produce is simultaneously assisted comparison and computing.By this, to reach the shooting under the long time for exposure, still suppress image fog and obtain the purpose of image clearly.In addition, the present invention is more owing to be to capture simultaneously with scene but the image of different exposure time, therefore available information is abundant when the image reprocessing, and designed algorithm also can be comparatively simple, therefore be able under the computing of short period, can reconstruct image more clearly, and have the advantage that promotes anti-hand shake operation efficiency.
But, the above, it only is the detailed description of specific embodiments of the invention and graphic, be not in order to restriction the present invention, all scopes of the present invention should be as the criterion with claim, anyly be familiar with this skill person in the field of the invention, can think easily and variation or modify and all can be encompassed in the claim that the present invention defines.
Claims (8)
1. the image-taking device of a tool inhibition image fog is characterized in that, is under the screening-mode of a time for exposure greater than a safety shutter, suppress image fog, and this image-taking device comprises:
One image acquisition unit receives one and takes signal to capture an at present fast student first image and second image smaller or equal to this safety shutter;
One shock sensor is used for writing down this image-taking device and one rocks the track signal during this first image exposure; And
One processing unit, in order to produce this shooting signal, and carrying out an operation program comes this second image is carried out smoothing processing, and the auxiliary operation that utilizes this vibrating locus signal is again estimated and a point spread function, and utilize this point spread function with this second image of acquisition originally second image after this smoothing processing relatively, producing an imaging point scale (Point Scale Image), and then again this first image and this imaging point scale are carried out a certain operations to recover to form an image output;
By this, under the screening-mode of this time for exposure, by assisting of this second image so that this first image is suppressed image fog greater than this safety shutter.
2. tool as claimed in claim 1 suppresses the image-taking device of image fog, it is characterized in that: further comprise:
One push-button unit connects this processing unit, in order to produce a trigger signals so that this processing unit produces this shooting signal;
One buffer unit is connected between this image acquisition unit and this processing unit, in order to keep in this first image and this second image for this processing unit access; And
One mnemon connects this processing unit, in order to store this image output.
3. a method that suppresses image fog is characterized in that, is applied to an image-taking device and sets the screening-mode of a time for exposure greater than a safety shutter, and its step comprises:
The acquisition one at present fast student's first image and second image smaller or equal to this safety shutter;
Write down this image-taking device and during this first image exposure, one rock the track signal;
Carry out an operation program so that this second image is carried out smoothing processing, and the auxiliary operation that utilizes this vibrating locus signal is estimated and a point spread function, and utilize this point spread function with this second image of acquisition originally second image after this smoothing processing relatively, to produce an imaging point scale (Point Scale Image); And
This first image and this imaging point scale are carried out a certain operations, first image is recovered to form an image output;
By this, under the screening-mode of this time for exposure, be able to assisting by this second image so that this first image is suppressed image fog greater than this safety shutter.
4. the method for inhibition image fog as claimed in claim 3 is characterized in that: described first image that captures is that long exposure is lost burnt fuzzy image to form one, and this second image is a short exposure to form a sharp keen sharp image that is full of noise.
5. the method for inhibition image fog as claimed in claim 3 is characterized in that: after this second image of acquisition, further carry out one and eliminate noise program (Noise Reduction), to reduce the noise of this second image.
6. the method for inhibition image fog as claimed in claim 3 is characterized in that: after producing this imaging point scale, further carry out an elimination program, this imaging point scale is carried out the processing of impurity elimination point and smoothing.
7. the method for inhibition image fog as claimed in claim 3 is characterized in that: described operation program is the program of the long-pending computing (Convolution) of folding.
8. the method for inhibition image fog as claimed in claim 3 is characterized in that: described certain operations be this first image with this imaging point scale between relative pixel carry out point-to-point computing of multiplying each other.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100059141A CN101510954B (en) | 2008-02-13 | 2008-02-13 | Imaging device capable of restraining image fog and method for restraining image fog |
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| CN2008100059141A CN101510954B (en) | 2008-02-13 | 2008-02-13 | Imaging device capable of restraining image fog and method for restraining image fog |
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| CN101510954A CN101510954A (en) | 2009-08-19 |
| CN101510954B true CN101510954B (en) | 2011-06-29 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1140949A (en) * | 1995-05-31 | 1997-01-22 | 索尼公司 | Temperature-dependant, frequency-compensated hand deviation correction device for video camera |
| CN101115143A (en) * | 2004-03-19 | 2008-01-30 | 松下电器产业株式会社 | Imaging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1140949A (en) * | 1995-05-31 | 1997-01-22 | 索尼公司 | Temperature-dependant, frequency-compensated hand deviation correction device for video camera |
| CN101115143A (en) * | 2004-03-19 | 2008-01-30 | 松下电器产业株式会社 | Imaging device |
Non-Patent Citations (1)
| Title |
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| JP特开2002-305682A 2002.10.18 |
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