CN101895783A - Detection device for stability of digital video camera and digital video camera - Google Patents

Detection device for stability of digital video camera and digital video camera Download PDF

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Publication number
CN101895783A
CN101895783A CN2009101384741A CN200910138474A CN101895783A CN 101895783 A CN101895783 A CN 101895783A CN 2009101384741 A CN2009101384741 A CN 2009101384741A CN 200910138474 A CN200910138474 A CN 200910138474A CN 101895783 A CN101895783 A CN 101895783A
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China
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digital camera
acquisition parameters
detecting
stability
camera
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CN2009101384741A
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翁启荣
萧铭松
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Altek Corp
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Altek Corp
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Abstract

The invention discloses a detection device for the stability of a digital video camera and a digital video camera. The detection method comprises the following steps: capturing a plurality of preview images at different time points; capturing a plurality of image blocks from at least one identical position of the preview images; calculating variation amounts of every two image blocks at the same position; comparing each variation amount with a displacement threshold; when all the variation amounts are equal to or less than the displacement threshold, judging whether the digital video camera is in a stable state; and when at least one variation amount is more than the displacement threshold, judging whether the digital video camera is in an instable state, and a group of corresponding shooting parameters is obtained according to the detection results of the stability.

Description

The method for detecting of stability of digital video camera and digital camera device
Technical field
The invention relates to image pickup method, be particularly to a kind of method for detecting of stability of digital video camera, it is used for digital camera device, detects its stable state to cause digital camera device can see through software mode, adjusts its acquisition parameters so as to correspondence.
Background technology
Develop today fast at digital camera, many people can utilize photography to write down memorable a moment.But no matter on egative film camera or digital camera, tend to, and produce fuzzy image when causing taking because the user controls instability to camera.So long as the free-hand camera of taking, more or less all exist the problem of vibrations.Difference is that everyone degree of stability of handing is all different, and causing pressing shutter moment can involuntary displacement.So produce fuzzy image for fear of making because hand shakes to take, digital camera manufacturer can see through hardware mode and avoid hand to shake, or comes proofreading and correct fuzzy digitized video with software mode.
So in each tame digital camera manufacturer product, all add the different anti-hands mechanism of shaking at oneself.The anti-hand mechanism of shaking is will be in shooting process, the image fog phenomenon that detecting and inhibition cause because of hand shake.The anti-hand technology of shaking mainly sees through the mode of hardware or software and reaches.
Hardware mode generally all is to utilize the sensitization electronic component to prevent that hand shakes and the anti-hand of optical profile type shakes.It is for improving photosensitivity (International Standards Organization that the anti-hand of sensitization electronic component shakes; ISO) ability.Basically improving ISO is in order to accelerate shutter speed, also can to bring higher noise simultaneously but improve ISO.And optical profile type prevents that it is the optical gyroscope element that a motion detecting is set that hand shakes in digital camera.When digital camera detects when hand taking place shake, digital camera can be shifted to camera lens in the other direction according to the direction that hand shakes, so as to compensation because the image fog that displacement caused.Another hand vibration prevention method is the mode of amplifying aperture, in order to be added to light quantity so as to shortening aperture time.But aperture size is the combo architectures that depends on lens group.Generally speaking, the camera lens of large aperture has higher cost and volume.So be difficult for being set in the digital camera of consumption-orientation.
Summary of the invention
In view of above problem, the invention reside in method for detecting and digital camera device that a kind of stability of digital video camera is provided, so that when taking digitized video, can be according to the acquisition parameters of the corresponding adjustment digital camera device of the stable state of digital camera device.
For reaching above-mentioned purpose, the method for detecting of the disclosed stability of digital video camera of the present invention is applied to a digital camera device.This method for detecting comprises: in many preview images of different time points acquisition; Capture a plurality of image blocks from least one same position of preview image; The amount of variability of calculating between per two the image blocks on the same position; Each amount of variability is compared with a displacement threshold value; When all amounts of variability were equal to or less than displacement threshold value, the judgement digital camera device was a stable state; And when at least one amount of variability during greater than displacement threshold value, the judgement digital camera device is a unsteady state.And, can obtain one group of corresponding acquisition parameters according to the detecting result of stability.
Wherein, can be earlier configure one group of acquisition parameters according to the image parameter of preview image, when judging that digital camera device is unsteady state, the then corresponding acquisition parameters that configures of adjusting is taken so that adjusted acquisition parameters is applicable under the unsteady state then.
In addition, when judging that digital camera device is stable state, corresponding stable state is set one group of acquisition parameters, is applicable to the acquisition parameters of taking under the stable state to obtain one group; And when judging that digital camera device is unsteady state, then corresponding unsteady state is set one group of acquisition parameters, is applicable to the acquisition parameters of taking under the unsteady state to obtain one group.
In this, the preview image can be digital camera device in preview phase and/or the image of taking the photograph in the stage in advance to be captured.
When judging that digital camera device is stable state, in photographing phase, digital camera device can directly be taken with the acquisition parameters of setting.Or, when judging that digital camera device is stable state, the first adjustment program of execution that can continue, with the change that influence shooting effect according to other because of the adjustment acquisition parameters.
When judging that digital camera device is unsteady state, then adjust the acquisition parameters that digital camera device is set, for example, but non-restriction of the present invention: photosensitivity, shutter value and f-number.In addition, when judging that digital camera device is unsteady state, also can carry out the second adjustment program, with the change that influence shooting effect according to other because of the adjustment acquisition parameters.
In an embodiment, the first adjustment program can influence the change of shooting effect because of carrying out the adjustment of acquisition parameters, the acquisition parameters of digital camera device during with the decision actual photographed according to the hardware setting of ambient brightness and digital camera device etc.
In an embodiment, the second adjustment program according to the hardware of state, ambient brightness and the digital camera device of object (for example, but non-restriction of the present invention: setting photoflash lamp etc.) etc. influences the change of shooting effect because of carrying out the adjustment of acquisition parameters, the acquisition parameters of digital camera device during with the decision actual photographed.
In an embodiment, according to the method for detecting of stability of digital video camera of the present invention can software or the mode of firmware be implemented on the digital camera device.That is, can be recorded in the storage element of digital camera device corresponding to a program code according to the method for detecting of stability of digital video camera of the present invention.The processing unit of digital camera device can read and carry out this program code, so that digital camera device is carried out the method for detecting according to stability of digital video camera of the present invention.
In sum, the method for detecting according to stability of digital video camera of the present invention can be applicable to digital camera device.Therefore, use one embodiment of the invention digital camera device can according to the capture stage with take the photograph in advance in the stage target image (promptly, the image of object) judges whether digital camera device is stable, and when digital camera device is astable, in to adjust acquisition parameters, so as to avoiding the wobble effects shooting effect according to current screening-mode.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the schematic diagram of digital camera device;
Fig. 2 is the flow chart according to the method for detecting of the stability of digital video camera of first embodiment of the invention;
Fig. 3 is the flow chart according to the method for detecting of the stability of digital video camera of second embodiment of the invention;
Fig. 4 is the flow chart according to the method for detecting of the stability of digital video camera of third embodiment of the invention;
Fig. 5 is the flow chart according to the method for detecting of the stability of digital video camera of fourth embodiment of the invention;
Fig. 6 A and Fig. 6 B are in the method for detecting according to stability of digital video camera of the present invention, the schematic diagram of the preview image of an embodiment;
Fig. 7 A, Fig. 7 B, Fig. 7 C and Fig. 7 D are in the method for detecting according to stability of digital video camera of the present invention, the schematic diagram of the image block of an embodiment;
Fig. 8 is the flow chart according to the method for detecting of the stability of digital video camera of fifth embodiment of the invention;
Fig. 9 is the flow chart according to the method for detecting of the stability of digital video camera of sixth embodiment of the invention;
Figure 10 is the flow chart according to the method for detecting of the stability of digital video camera of seventh embodiment of the invention;
Figure 11 is the flow chart according to the method for detecting of the stability of digital video camera of eighth embodiment of the invention.
Wherein, Reference numeral
100 digital camera devices
110 lens group
120 photo-sensitive cells
130 storage elements
140 processing units
The M1 first preview image
The M2 second preview image
Pa, Pb position
B1a, B1b, B2a, B2b image block
C1a, C1b, C2a, C2b target signature
Embodiment
In this, method for detecting and digital camera device according to stability of digital video camera of the present invention, can software the detecting digital camera device stable state whether, and then the stable state of corresponding digital camera device decides the acquisition parameters of digital camera device, for example: (but non-restriction of the present invention) photosensitivity, shutter value and f-number etc.In this, be see through to analyze capture in advance many preview images in the position amount of variability of object judge the stable state of digital camera device and then the acquisition parameters of decision digital camera device.Moreover, the hardware of state, ambient brightness and the digital camera device of object (for example when also further reference was taken, but non-restriction of the present invention: the change that setting photoflash lamp etc.) etc. influences shooting effect because of, more suitably determine the acquisition parameters of digital camera device.
Please refer to Fig. 1, digital camera device 100 can comprise: lens group 110, photo-sensitive cell 120, storage element 130 and processing unit 140.
The running of digital camera device 100 can be divided into preview phase (live view), take the photograph the stage (auto focusing) and photographing phase in advance.
Preview phase is meant that the user pushes the shutter key moment before of digital camera device 100.In preview phase, the display (not shown) preview that the user can see through digital camera device 100 picture of finding a view.
The stage of taking the photograph is meant that the user is in half moment by the shutter key of digital camera device 100 in advance.In taking the photograph in advance in the stage, digital camera device 100 can begin to adjust the object distance of object in the lens group 110 and the picture of finding a view, and the user can see through the find a view picture of the display preview of digital camera device 100 to defocused (that is after, the object distance adjustment is finished).
Photographing phase is meant that the user presses the moment of the shutter key of digital camera device 100 entirely.In photographing phase, digital camera device 100 can take current find a view picture and will take the picture of finding a view be recorded as an image.
In this, the preview image is meant that digital camera device 100 is in preview phase or the image of taking the photograph in the stage in advance to be captured.
Lens group 110 is in order to adjust the focal length to object.
Photo-sensitive cell 120 corresponding lens group 110 and being provided with.Photo-sensitive cell 120 can see through the light signal that lens group 110 receives corresponding to object, and the signal of telecommunication that converts digitized video according to received light signal to is to obtain the image corresponding to object.In other words, photo-sensitive cell 120 can in the preview phase of digital camera device 100 and the stage of taking the photograph in advance via lens group 110 acquisition preview images, and in the photographing phase of digital camera device 100 via lens group 110 acquisition of digital video.
Processing unit 140 is electrically connected at photo-sensitive cell 120 and storage element 130.The running of processing unit 140 may command lens group 110 and photo-sensitive cell 120, and can promptly whether rock according to the stability of the preview image judgement digital camera device 100 that captures.
In other words, can software according to the method for detecting of stability of digital video camera of the present invention or the mode of firmware be implemented on the digital camera device.That is, can be recorded in the storage element 130 of digital camera device 100 corresponding to a program code according to the method for detecting of stability of digital video camera of the present invention.The processing unit 140 of digital camera device 100 can read and carry out this program code, so that the method for detecting that digital camera device 100 is carried out according to stability of digital video camera of the present invention.
Wherein, processing unit 140 can be realized by one or more processors.Storage element 130 can be realized by one or more holders.Holder can be non-voltile memory or is volatile memory.
Fig. 2 is the flow chart of the method for detecting of stability of digital video camera according to an embodiment of the invention.
See figures.1.and.2, the method for detecting of stability of digital video camera can be applicable in the digital camera device 100.
Photo-sensitive cell 120 sees through lens group 110 acquisition many preview images (step 210) in different time points.Wherein, photo-sensitive cell 120 can be in the preview phase of digital camera device 100 and/or the stage of taking the photograph is carried out the acquisition of preview image in advance.
For instance, photo-sensitive cell 120 can capture the preview image of different picture update rates (frame rate) in the preview phase of digital camera device 100, and captures the preview image more than two.Perhaps, photo-sensitive cell 120 can capture at least one preview image in the preview phase of digital camera device 100, and then captures at least one preview image in the stage in taking the photograph in advance of digital camera device 100.
And, capture the preview image can by processing unit 140 carry out following image block acquisition, analyze and judgement, to learn the stability of digital camera device.
At first, capture image block (step 250) on the same position in this preview image (that is, the relative position in affiliated preview image is identical).In this, the image block is the regional area of preview image, and promptly the size of image block is the size less than the preview image.
Moreover, can capture one or more image blocks from the diverse location of every preview image.And every preview image carries out the position and the quantity of image block acquisition can be all identical, and capture in the same position place of every preview image the image block be same size.When a plurality of image block of every preview image capture, a plurality of image blocks that capture from same preview image can be same size, also can be different size, or partly image block measure-alike and the size difference of partial image block.In this, can preestablish the parameters such as position, quantity and size of desiring the pick-up image block.
In addition, can after get, every preview image capture promptly send processing unit 140 to and carry out the acquisition of image block.Also can be earlier with capture the preview image be temporary in the storage element 130, after all preview image captures are finished, carry out the acquisition of the image block of every preview image again by processing unit 140.Moreover when processing unit 140 was had much to do, for example: still when handling last preview image, the follow-up preview image of obtaining can be temporary in earlier in the storage element 130.
Then, the amount of variability (step 270) of calculating between per two the image blocks on the same position of different preview images.
Then, the amount of variability that calculates is compared with a displacement threshold value (step 290).In this, can preestablish displacement threshold value.
When all amounts of variability are equal to or less than displacement threshold value, judge that digital camera device 100 is a stable state (step 310).And, judge that digital camera device 100 is a unsteady state (step 320) when one or more amounts of variability during greater than displacement threshold value
In this, stable and the unsteady state of alleged digital camera device 100 are meant whether the body of digital camera device 100 fixedly is maintained on the same position.
And, can obtain one group of corresponding acquisition parameters (step 350 and step 352) according to the detecting result of stability, with imposing a condition as the related hardware element of the image capture of digital camera device 100 in photographing phase.That is, when judging that digital camera device 100 is stable state (step 310), obtain one group and be applicable to the acquisition parameters of taking under the stable state (step 350).And when judging that digital camera device 100 is unsteady state (step 320), obtain one group and be applicable to the acquisition parameters of taking under the unsteady state (step 352).At this moment, in photographing phase, digital camera device 100 is that available acquisition parameters is taken, and with acquisition of digital video, is about to the current picture of finding a view and is recorded as digitized video.
In this, acquisition parameters can comprise that photosensitivity, shutter value and f-number etc. impose a condition.
Wherein, can be earlier configure one group of acquisition parameters, after the stability detecting of finishing digital camera device, promptly after step 310 or the step 320, whether adjust pre-set acquisition parameters according to detecting result decision again according to the image parameter of preview image.
In other words, with reference to Fig. 3, processing unit 140 can be set one group of acquisition parameters (step 230) according to the image parameter of preview image earlier.
Then, when judging that digital camera device 100 is stable state (step 310), the acquisition parameters that obtains is the acquisition parameters (step 350) of setting.In other words, when judging that digital camera device 100 is stable state (step 310), in photographing phase, digital camera device 100 can directly be taken with the acquisition parameters of setting, and with acquisition of digital video, is about to the current picture of finding a view and is recorded as digitized video.
And when judging that digital camera device is unsteady state (step 320), then adjust the acquisition parameters (step 330) that configures, for example, but non-restriction of the present invention: acquisition parameters such as photosensitivity, shutter value and f-number, so that being applicable under the unsteady state, takes adjusted acquisition parameters.In other words, when judging that digital camera device is unsteady state (step 320), the acquisition parameters that obtains is adjusted acquisition parameters (step 352).Therefore, when judging that digital camera device is unsteady state (step 320), in photographing phase, the acquisition parameters that digital camera device 100 can obtain at last (promptly, adjusted acquisition parameters) takes,, be about to the current picture of finding a view and be recorded as digitized video with acquisition of digital video.
For instance, if the setting option of the photosensitivity of digital camera device 100 can have numerical value such as 100,125,200 and 400, the setting option of aperture can have numerical value such as 2.8,3.2,4,4.5 and 5.When digital camera device 100 shook in shooting process, when just digital camera device 100 was in unsteady state, digital camera device 100 can be adjusted acquisition parameters such as the former photosensitivity that configures, shutter value and f-number respectively.In this, the photosensitivity of supposing digital camera device 100 current settings is 100, aperture time (shutter value) is that 1/60 second and safety shutter time are 1/100 second.When judging that digital camera device 100 occurs in the stage rocking (promptly taking the photograph in advance, digital camera device 100 is a unsteady state) time, digital camera device 100 can be adjusted into 200 with photosensitivity, make aperture time under identical aperture, be increased to 1/120 second, to cause aperture time faster than 1/100 second of safety shutter time.
In addition, also after the stability detecting of finishing digital camera device, promptly after step 310 or the step 320, corresponding again detecting result sets corresponding acquisition parameters.
In other words, with reference to Fig. 4, when judging that digital camera device is stable state (step 310), corresponding stable state is set one group of acquisition parameters (step 340), is applicable to the acquisition parameters of taking under the stable state (step 350) to obtain one group.And when judging that digital camera device is unsteady state (step 320), then corresponding unsteady state is set one group of acquisition parameters (step 342), is applicable to the acquisition parameters of taking under the unsteady state (step 352) to obtain one group.
For convenience of description, below explanation be applied to digital camera device and acquisition in preview phase last preview image and be example at first preview image taking the photograph in advance in the stage.
With reference to Fig. 5, at first capture last preview image in preview phase (below be referred to as the first preview image) (step 212), and then first preview image in the stage (below be referred to as the second preview image) (step 214) taken the photograph in acquisition in advance.
Then, analyze between the first preview image and the second preview image amount of variability of the object in the two preview images.
Referring again to Fig. 6 A, Fig. 6 B, Fig. 7 A, Fig. 7 B, Fig. 7 C and Fig. 7 D, respectively at the same position Pa of the first preview image M1 and the second preview image M2 and image block B1a, B2a and B1b, the B2b (step 250) at Pb place.And, capture from the same position place of the first preview image M1 and the second preview image M2 image block B1a, B2a and B1b, B2b be same size.
In other words, image block B1a and image block B2a are respectively the local images on the relative position Pa identical in the first preview image M1 and the second preview image M2, and are same size.Similarly, image block B1b and image block B2b are respectively the local images on the relative position Pb identical in the first preview image M1 and the second preview image M2, and are same size.That is, capture image block B1a, B1b, and capture image block B2a, B2b in middle body and the marginal portion of the second preview image M2 equally in middle body and the marginal portion of the first preview image M1.
In this, though describe with every preview image capture two image blocks, this is not restriction of the present invention.In practical application, every preview image is image block of fechtable or the image block more than three also.
In addition, though all be to address the acquisition of finishing the preview image earlier then to carry out the acquisition of image block, this non-restriction of the present invention in this and diagram.In practical application, also can after the acquisition of finishing a preview image, promptly continue to capture the preview image carry out the acquisition of image block, also can be simultaneously or carry out the acquisition of next preview image this moment after the acquisition of the image block of this preview image finished.
Calculating is from image block B1a, the B2a that same position Pa and Pb captured of the first preview image M1 and the second preview image M2 and the amount of variability (step 270) between B1b, the B2b.That is, amount of variability (to call first amount of variability in the following text) between calculating image block B1a and the image block B2a and the amount of variability (to call second amount of variability in the following text) between image block B1b and the image block B2b.In this, the image feature (for example, but non-restriction of the present invention: brightness and/or edge feature and/or color etc.) that can see through analyze two image block B1a, B2a and B1b, B2b obtains amount of variability.
Then, compare first amount of variability and displacement threshold value and comparison second amount of variability and displacement threshold value (step 290).
When first amount of variability is equal to or less than displacement threshold value and second amount of variability and is equal to or less than this displacement threshold value, judge that digital camera device is a stable state (step 310).
When first amount of variability and/or second amount of variability during, judge that digital camera device is a unsteady state (step 320) greater than displacement threshold value.
In an embodiment, can see through and analyze image block B1a, B2a, B1b, target signature C1a, the C2a of B2b, C1b, C2b, and calculate target signature C1a, C2a and C1b, C2b in from image block B1a, the B2a of same position Pa and Pb and the displacement between B1b, the B2b, with as amount of variability.
In this, target signature is meant the part of object in the image block in the preview image.
With reference to Fig. 6 A-Fig. 6 B, Fig. 7 A-Fig. 7 D and Fig. 8, analyze each image block B1a, B2a, B1b, target signature C1a, the C2a of B2b, C1b, C2b (step 272).Calculate each target signature C1a, C2a, C1b, the C2b position (step 274) in affiliated image block B1a, B2a, B1b, B2b.Compare any two image blocks B1a, B2a and target signature C1a, the C2a of B1b, B2b and the position of C1b, C2b from same position Pa and Pb, obtaining the displacement (step 276) between two positions, and carry out follow-up comparison and judgement as amount of variability with the displacement that obtains.
In this, the image feature (for example, but non-restriction of the present invention: brightness and/or edge feature and/or color etc.) that can see through detecting image block B1a, B2a, B1b, B2b obtains target signature C1a, C2a, C1b, C2b and target signature C1a, the C2a of image block B1a, B2a, B1b, B2b, the position of C1b, C2b.
In addition, when judging that digital camera device 100 be stable state (step 310), the first adjustment program (step 370) of execution that can continue, with the change that influences shooting effect according to other because of the adjustment acquisition parameters, as shown in Figure 9.
In the first adjustment program (step 370), can influence the change of shooting effect because of carrying out the adjustment of acquisition parameters according to hardware setting of ambient brightness and digital camera device 100 etc., the acquisition parameters of digital camera device 100 during with the decision actual photographed, promptly in photographing phase, digital camera device 100 is taken employed acquisition parameters.
Moreover, when judging that digital camera device 100 be unsteady state, the one second adjustment program (step 390) of execution that then can continue, so as to again according to other change that influences shooting effect because of the adjustment acquisition parameters, as shown in Figure 9.
In the second adjustment program (step 390), can be (for example according to the hardware of state, ambient brightness and the digital camera device 100 of object, but non-restriction of the present invention: setting photoflash lamp etc.) etc. influences the change of shooting effect because of carrying out the adjustment of acquisition parameters, the acquisition parameters of digital camera device 100 during with the decision actual photographed, promptly in photographing phase, digital camera device 100 is taken employed acquisition parameters.
In other words, in the first adjustment program (step 370) and the second adjustment program (step 390), also can be according to the stable situation of digital camera device, carry out other change that influences shooting effect because of analysis and judgement, more suitably to be decided by the acquisition parameters of digital camera device in the photographing phase.
With reference to Figure 10, in the first adjustment program (step 370), at first detect the active state (that is, motion state or inactive state) (step 372) of object in the preview image.
When object is kept in motion (step 374), heighten photosensitivity in the acquisition parameters of digital camera device 100, transfer the f-number in the acquisition parameters of big digital camera device 100, and the shutter value (step 376) in the acquisition parameters of shortening digital camera device 100, then in photographing phase (promptly promptly with the acquisition parameters that obtains at last, photosensitivity, f-number and the adjusted acquisition parameters of shutter value) take, the current picture of finding a view is recorded as digitized video according to the acquisition parameters that obtains at last.
When object remains static (step 375), turn down the photosensitivity (step 377) in the acquisition parameters of digital camera device 100, and the analysis and the judgement that continue and carry out ambient brightness.
In the analysis of ambient brightness and judging, detecting ambient brightness (step 377) earlier, and will detect ambient brightness compare (step 378) with luminance threshold, whether be the environment of luminance shortage such as night scene so as to learning shooting environmental.
When detect ambient brightness when being higher than luminance threshold, be judged as the shooting environmental of luminance shortage such as non-night scene.When being judged as the shooting environmental of luminance shortage such as non-night scene, then no longer carry out the adjustment of acquisition parameters, and with the acquisition parameters (that is the acquisition parameters after the photosensitivity adjustment (step 377)) that obtains at last as in photographing phase in order to the find a view acquisition parameters (step 380) of picture of shooting.
When detect ambient brightness when being equal to or less than this luminance threshold, be judged as the shooting environmental of luminance shortage such as night scene, and the operating state (that is, whether the unlatching photoflash lamp being arranged) (step 382) of the photoflash lamp of detecting digital camera device 100.
When detecting to such an extent that photoflash lamp is when opening (that is, starting), the shutter value in the acquisition parameters of digital camera device 100 to be set at the aperture time (step 384) of synchroflash at a slow speed, to obtain one group of acquisition parameters.Then, in photographing phase, promptly take, be about to the current picture of finding a view and be recorded as digitized video with the acquisition parameters (that is, photosensitivity and shutter value are adjusted the acquisition parameters after (step 377 and step 384)) that obtains at last.
In this, the aperture time of synchroflash is meant at a slow speed, and flash application at long aperture time, and is not needed to consider with safety shutter.So, digital camera device 100 can also obtain more ambient brightness light except the luminance compensation that can capture photoflash lamp.
When detect photoflash lamp when not opening (that is, start), then the shutter value in the acquisition parameters of digital camera device is set at the aperture time (step 386) of time exposure, to obtain one group of acquisition parameters.Then, in photographing phase, promptly take, be about to the current picture of finding a view and be recorded as digitized video with the acquisition parameters (that is, photosensitivity and shutter value are adjusted the acquisition parameters after (step 377 and step 386)) that obtains at last.
With reference to Figure 11, in the second adjustment program (step 390), first detecting ambient brightness (step 392), and will detect ambient brightness compare (step 394) with luminance threshold, whether be the environment of luminance shortage such as night scene so as to learning shooting environmental.
When detect ambient brightness when being higher than luminance threshold, be judged as the shooting environmental of luminance shortage such as non-night scene, and the operating state (that is, whether the unlatching photoflash lamp being arranged) (step 396) of the photoflash lamp of detecting digital camera device 100.
When detect ambient brightness when being equal to or less than this luminance threshold, be judged as the shooting environmental of luminance shortage such as night scene, and the operating state (that is, whether the unlatching photoflash lamp being arranged) (step 397) of the photoflash lamp of detecting digital camera device 100.
When detecting to such an extent that photoflash lamp is when opening (that is, starting), the shutter value in the acquisition parameters of digital camera device 100 to be set at the safety shutter time (step 398 or step 399), to obtain one group of acquisition parameters.Then, in photographing phase, i.e. acquisition parameters to obtain at last, promptly the shutter value is adjusted (step 398 or step 399) back or step 330 and is adjusted acquisition parameters after back and shutter value are adjusted (step 398 or step 399), takes.
When detect photoflash lamp when not opening (that is, start), shutter value in the acquisition parameters of more adjusted digital camera device 100 and safety shutter time (step 400 or step 401) are to learn that whether current shutter value is faster than the safety shutter time.
Obtain current shutter value after relatively and during the time, then no longer carry out the adjustment of acquisition parameters faster than safety shutter, and with the acquisition parameters that obtains at last as in photographing phase in order to the acquisition parameters (step 402 or step 403) of acquisition of digital video.In other words, obtain current shutter value after relatively faster than safety shutter during the time, promptly with the acquisition parameters that in step 342, sets as in photographing phase in order to the acquisition parameters (step 402 or step 403) of acquisition of digital video, or with adjusted acquisition parameters in step 330 as in photographing phase in order to the acquisition parameters (step 402 or step 403) of acquisition of digital video.
Obtain current shutter value after relatively and equal or be slower than safety shutter during the time, then heighten photosensitivity and transfer large aperture value (step 404 or step 405), to obtain one group of acquisition parameters.In other words, obtaining current shutter value after relatively equals or is slower than safety shutter during the time, photosensitivity in the acquisition parameters that will set in step 342 is heightened, and the f-number in the acquisition parameters that will set in step 342 is transferred big (step 404 or step 405).Or, obtain current shutter value after relatively and equal or be slower than safety shutter during the time, heighten photosensitivity more further and transfer large aperture value (step 404 or step 405) for adjusted acquisition parameters in the step 330.Then, in photographing phase, promptly with the acquisition parameters after photosensitivity and the f-number adjustment (step 404 or step 405) as in photographing phase in order to the acquisition parameters of acquisition of digital video, perhaps with step 330 adjust after back and photosensitivity and the f-number adjustment (step 404 or step 405) acquisition parameters as in photographing phase in order to the acquisition parameters of acquisition of digital video.
In the above description, though be to describe each step in regular turn, this execution sequence is not restriction of the present invention, without departing from the spirit and scope of the present invention, and when the execution sequence that can adjust each step arbitrarily.
In sum, the method for detecting according to stability of digital video camera of the present invention can be applicable to digital camera device.Therefore, use one embodiment of the invention digital camera device can according to the capture stage with take the photograph in advance in the stage target image (promptly, the image of object) judges whether digital camera device is stable, and when digital camera device is astable, in to adjust acquisition parameters, so as to avoiding the wobble effects shooting effect according to current screening-mode.For instance, hand takes place and shakes in the user when taking, and digital camera device can determine the user and rock, and then carries out the adjustment of acquisition parameters, so as to reduce with hand shake to capture the influence of digitized video.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (10)

1. the method for detecting of a stability of digital video camera is applied to a digital camera device, it is characterized in that, this method comprises:
In many preview images of different time points acquisition;
Capture the image block at least one same position in these many preview images;
The amount of variability of calculating between per two the image blocks on this same position;
Each this amount of variability is compared with a displacement threshold value;
When all these amounts of variability are equal to or less than this displacement threshold value, judge that this digital camera device is a stable state;
When one of them this amount of variability during, judge that this digital camera device is a unsteady state greater than this displacement threshold value.
2. the method for detecting of stability of digital video camera according to claim 1 is characterized in that, the step that wherein captures these many preview images comprises:
Take the photograph in advance at least one stage wherein in stage in a preview phase and of this digital camera device, acquisition should multiple many preview images.
3. the method for detecting of stability of digital video camera according to claim 1 is characterized in that, more comprises:
At least one image parameter according at least one preview image in these many preview images is set one group of acquisition parameters;
When judging that this digital camera device is unsteady state, adjust this group acquisition parameters of setting;
When judging that this digital camera device is stable state, do not adjust this group acquisition parameters of setting.
4. the method for detecting of stability of digital video camera according to claim 1 is characterized in that, more comprises:
When judging that this digital camera device is stable state, carry out one first adjustment program, this first adjustment program comprises:
See through the active state of these many preview image detecting one objects;
When this object is in a motion state, heightens a photosensitivity in the acquisition parameters of this digital camera device, transfer the f-number in this acquisition parameters of big this digital camera device, and shorten a shutter value in this acquisition parameters of this digital camera device;
When this object is in an inactive state, turn down this photosensitivity in this acquisition parameters of this digital camera device.
5. the method for detecting of stability of digital video camera according to claim 4 is characterized in that, wherein when this object was in this inactive state, this first adjustment program more comprised:
Detect an ambient brightness;
Relatively this ambient brightness and a luminance threshold;
When this ambient brightness is higher than this luminance threshold, with this acquisition parameters of obtaining at last as in order to capture this acquisition parameters of a digitized video;
When this ambient brightness is equal to or less than this luminance threshold, detect the operating state of a photoflash lamp of this digital camera device;
When detect this photoflash lamp when opening, this shutter value in this acquisition parameters of this digital camera device is set at the aperture time of synchroflash at a slow speed;
When detect this photoflash lamp when not opening, this shutter value in this acquisition parameters of this digital camera device is set at the aperture time of a time exposure.
6. the method for detecting of stability of digital video camera according to claim 1 is characterized in that, more comprises:
When judging that this digital camera device is unsteady state, carry out one second adjustment program, this second adjustment program comprises:
Detect the operating state of a photoflash lamp of this digital camera device;
This operating state according to this photoflash lamp determines in order to capture the acquisition parameters of a digitized video.
7. the method for detecting of stability of digital video camera according to claim 6 is characterized in that, wherein should comprise according to this operating state decision of this photoflash lamp step in order to the acquisition parameters that captures a digitized video:
When this photoflash lamp is opened, the shutter value in this acquisition parameters of this digital camera device is set at the safety shutter time;
When this photoflash lamp is not opened, relatively this shutter value in this acquisition parameters of this digital camera device and this safety shutter time;
When relatively obtaining this shutter value faster than this safety shutter during the time, with this acquisition parameters of obtaining at last as in order to capture this acquisition parameters of this digitized video;
Equal or be slower than this safety shutter during the time when relatively obtaining this shutter value, heighten the photosensitivity in this acquisition parameters of this digital camera device, and transfer the f-number in this acquisition parameters of big this digital camera device.
8. the method for detecting of stability of digital video camera according to claim 1 is characterized in that, the step of wherein calculating each this amount of variability comprises:
Analyze the target signature of each this image block;
Calculate the position of each this target signature in this affiliated image block;
Relatively any two these positions to be obtaining at least one displacement, and with this displacement of obtaining as this amount of variability.
9. the method for detecting of stability of digital video camera according to claim 1 is characterized in that, more comprises:
When judging that this digital camera device is unsteady state, to setting one group of acquisition parameters by unsteady state; And
When judging that this digital camera device is stable state, to should stable state setting one group of acquisition parameters.
10. digital camera device, it is characterized in that, comprise: a processing unit that is electrical connected and a storage element, wherein this storage element records that this processing unit can read and an executable program code, and this program code is with so that this digital camera device is carried out the method for detecting according to each the described stability of digital video camera in the claim 1 to 9.
CN2009101384741A 2009-05-18 2009-05-18 Detection device for stability of digital video camera and digital video camera Pending CN101895783A (en)

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CN102857685A (en) * 2011-06-29 2013-01-02 宏达国际电子股份有限公司 Image acquisition method and image acquisition system
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US11048332B2 (en) 2016-05-24 2021-06-29 Compal Electronics, Inc. Picture selection method of projection touch
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CN110225335B (en) * 2019-06-20 2021-01-12 中国石油大学(北京) Camera stability evaluation method and device

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