CN102111559A - Method for correcting sensitivity gain - Google Patents
Method for correcting sensitivity gain Download PDFInfo
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- CN102111559A CN102111559A CN2009102155129A CN200910215512A CN102111559A CN 102111559 A CN102111559 A CN 102111559A CN 2009102155129 A CN2009102155129 A CN 2009102155129A CN 200910215512 A CN200910215512 A CN 200910215512A CN 102111559 A CN102111559 A CN 102111559A
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- preview mode
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Abstract
The invention relates to a method for correcting a sensitivity gain, which comprises the following steps of: obtaining a standard sensitivity gain of a preview mode by using a standard light source correction imaging device in the preview mode; obtaining a standard sensitivity gain of a capture mode by using the standard light source correction imaging device in the capture mode; determining the grain ratio of the standard sensitivity gain of the capture mode to the standard sensitivity gain of the preview mode; and when the imaging device is operated, analogizing the exposure condition of the preview mode to the exposure condition of the capture mode according to the gain ratio.
Description
Technical field
The present invention relates to a kind of imaging device, particularly relate to a kind of method of proofreading and correct the sensitivity gain.
Background technology
Digital camera generally is according to the following measured conditions of exposure of preview mode (preview mode), and for example f-number and shutter value are directly analogized the conditions of exposure of the acquisition pattern that obtains (capture mode) in the definite value mode.Yet, may be between each digital camera because the otherness of optical element (for example lens), electronic component or photoelectric cell (for example charge coupled cell (CCD)) causes the aforementioned definite value suitable conditions of exposure of class release ideally.Moreover, when many production lines are produced simultaneously, also may be because Different Light lamp box or other factors cause the inconsistent and error of photosensitivity.
Therefore need the imaging device bearing calibration that proposes a kind of novelty, the photosensitivity tool height consistency of the imaging device of being produced to guarantee badly.
Summary of the invention
The objective of the invention is to, the method that provides a kind of new correction sensitivity to gain, the photosensitivity that is applicable to imaging device (for example digital camera or digital code camera) is proofreaied and correct, technical problem to be solved is to make its accuracy that promotes the sensitivity of imaging device, and guarantees the photosensitivity tool height consistency of the imaging device produced.
The object of the invention to solve the technical problems realizes by the following technical solutions.The method of a kind of correction sensitivity gain (sensitivity gain) that proposes according to the present invention, it may further comprise the steps: a standard sources (light source) is provided; Under preview (preview) pattern, proofread and correct an imaging (imaging) device with this standard sources, to obtain the normal sensibility yield value of a preview mode; Under acquisition (capture) pattern, proofread and correct this imaging device with this standard sources, to obtain the normal sensibility yield value of an acquisition pattern; And the gain ratio of the normal sensibility yield value of the normal sensibility yield value of this acquisition pattern of decision and this preview mode; This imaging device is in when operation, according to this gain ratio in order to the conditions of exposure class of preview mode is pushed into the conditions of exposure of acquisition pattern.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The method of aforesaid correction sensitivity gain, wherein said imaging device is digital camera or digital code camera.
The method of aforesaid correction sensitivity gain, wherein said standard sources is for meeting the light source of Commission Internationale De L'Eclairage (CIE) standard.
The method of aforesaid correction sensitivity gain, wherein said imaging device institute's sensor pixel number under preview mode is the some of institute's sensor pixel number under the acquisition pattern.
The method of aforesaid correction sensitivity gain, wherein said imaging device institute's sensor pixel number under preview mode is the sixth of institute's sensor pixel number under the acquisition pattern.
The method of aforesaid correction sensitivity gain behind this gain ratio of decision, also comprises this gain ratio is stored in this imaging device.
The method of aforesaid correction sensitivity gain, in the aligning step of the aligning step of above-mentioned preview mode and acquisition pattern, the correcting condition of this imaging device is a default sensitivity (Sv, speed value), and this standard sources tool one default shading value (Bv, luminance value), by this, make this imaging device have fixedly exposure value (Ev, exposure value), that is, Ev=Bv+Sv.
The method of aforesaid correction sensitivity gain, the conditions of exposure of the conditions of exposure of wherein said preview mode and acquisition pattern comprise f-number (Av, aperture value) and shutter value, and (Tv, timevalue), it meets Ev=Av+Tv.
The method of aforesaid correction sensitivity gain, resulting this normal sensibility yield value of aligning step of wherein said preview mode and acquisition pattern are to control (AGC) unit with the automatic gain of this imaging device to be produced.
The method of aforesaid correction sensitivity gain, the aligning step of wherein said preview mode obtains a plurality of these normal sensibility yield values.
The method of aforesaid correction sensitivity gain, its also comprise construction one preview mode table look-up (lookuptable, LUT), to store a plurality of normal sensibility yield values of this preview mode.
The method of aforesaid correction sensitivity gain, the aligning step of wherein said acquisition pattern obtains a plurality of these normal sensibility yield values.
The method of aforesaid correction sensitivity gain, it also comprises construction one acquisition pattern tables look-up (LUT), to store a plurality of normal sensibility yield values of this acquisition pattern.
The present invention compared with prior art has tangible advantage and beneficial effect.As known from the above,, the invention provides a kind of method of proofreading and correct the sensitivity gain, a standard sources at first is provided for achieving the above object.Under preview mode, proofread and correct an imaging (imaging) device with standard sources, to obtain the normal sensibility yield value of a preview mode.Be under the acquisition pattern, with standard sources correcting imaging device, to obtain the normal sensibility yield value of an acquisition pattern.The gain ratio of the normal sensibility yield value of decision acquisition pattern and the normal sensibility yield value of preview mode.By this, imaging device can be according to gain ratio in order to be pushed into the conditions of exposure class of preview mode the conditions of exposure of acquisition pattern when operation.In another embodiment, more construction one preview mode is tabled look-up (LUT), to store a plurality of normal sensibility yield values of preview mode, reaches construction one acquisition pattern and tables look-up, with a plurality of normal sensibility yield values of storage retrieval pattern.
By technique scheme, the method that the present invention proofreaies and correct the sensitivity gain has following advantage and beneficial effect at least:
The method of correction sensitivity gain of the present invention, the photosensitivity that is applicable to imaging device (for example digital still camera or numerical digit video camera) is proofreaied and correct, have the accuracy of the sensitivity that promotes imaging device, and guarantee the conforming effect of photosensitivity tool height of the imaging device produced.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the flow chart that the present invention proofreaies and correct method one embodiment of sensitivity gain.
Fig. 2 is the flow chart that the present invention proofreaies and correct another embodiment of method of sensitivity gain.
11-15B: step
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of method, structure, step, feature and the effect thereof of the correction sensitivity gain that foundation the present invention is proposed, describe in detail as after.
Seeing also shown in Figure 1ly, is the flow chart that the present invention proofreaies and correct method one embodiment of sensitivity gain.One embodiment of the invention is proofreaied and correct the method for sensitivity gain, at first, in step 11, provides a standard sources (light source), for example the standard light box.Standard sources can be, but not be defined as Commission Internationale De L'Eclairage (Commission internationa lede l ' é clairage, the CIE) light source of standard.For example, the D series standard light source of CIE standard is in order to represent daylight (daylight).
Then, in step 12A, under preview mode (preview mode), proofread and correct (calibrate) imaging device (imaging device) with standard sources, with the normal sensibility yield value (sensitivity gain) that obtains preview mode.In the present embodiment, imaging device can be, but not be defined as digital camera or digital code camera.Carry out the correction of preview mode with digital camera alignment criteria light source,, can enter preview mode when the shutter release button (shutter button) of the digital camera half that is pressed.The sensitivity yield value of the alleged preview mode of this specification, be meant under the default shading value (or brightness value) of standard sources, corresponding to a certain default sensitivity (sensitivity) (for example ISO 100), the automatic gain of digital camera control (AGC) corresponding yield value (gain) that circuit produced.
Above-mentioned correction relationship can use photographic exposure amount adding system, and (Additive system ofPhotographic Exposure, exposure equation formula APEX) explains as follows.If default sensitivity is with Sv (being called velocity amplitude (speed value) again) expression, the default shading value of standard sources is with Bv (luminance value) expression, by this, will make fixedly exposure value Ev (exposurevalue) of imaging device tool, and is as follows:
Ev＝Bv+Sv (1)
Exposure value Ev can determine conditions of exposure: f-number Av (aperture value) and shutter value Tv (be called time value (time value) again, it meets following formula:
Ev＝Av+Tv (2)
Convolution (1) can obtain following formula (3) with formula (2):
Ev＝Bv+Sv＝Av+Tv (3)
On the other hand, in step 12B, under acquisition pattern (capture mode), proofread and correct same imaging device, to obtain the normal sensibility yield value of the pattern that captures with same standard sources.In the present embodiment, proofread and correct, when the shutter release button of digital camera is pressed fully, can enter the acquisition pattern with digital camera alignment criteria light source.Be similar to the situation of preview mode, the acquisition pattern the sensitivity yield value, be meant under the default shading value (or brightness value) of standard sources, corresponding to a certain default sensitivity (sensitivity) (for example ISO 100), the corresponding yield value (gain) of the automatic gain of digital camera control (AGC) circuit.
Because the number of pixels of imaging device institute's sensing under preview mode is generally the some of the number of pixels of institute's sensing under the acquisition pattern, for example is sixth.Therefore, traditional digital cameras all is to proofread and correct out the sensitivity yield value under preview mode, with six as gain ratio, extrapolates the sensitivity yield value of acquisition pattern then.By this, under preview mode,, be ratio promptly with six through the resulting conditions of exposure of photometry, directly class is released the conditions of exposure of acquisition pattern.
In theory, the acquisition exposure mode condition released of above-mentioned traditional digital cameras institute class will be optimum exposure condition.Yet in fact, different digital cameras may be because of the otherness of image sensor (for example charge coupled cell), optical mirror slip or other optics/electronic components, thereby causes the inconsistent of sensitivity, and then influences image quality.
For avoiding this problem, present embodiment is in step 13, and the ratio of the normal sensibility yield value of decision acquisition pattern and the normal sensibility yield value of preview mode is as the gain ratio of this digital camera, it can be stored in, and (step 14) for example is stored in the firmware in this digital camera.In general, each imaging device (for example digital camera) may make that other ratio of gains value is different because of the difference between optics/electronic component.When digital camera when manipulating each time, can be according to stored separately gain ratio, in order to the conditions of exposure of preview mode exactly class be pushed into the conditions of exposure of acquisition pattern.
Seeing also shown in Figure 2ly, is the flow chart that the present invention proofreaies and correct another embodiment of method of sensitivity gain.The process step of present embodiment is similar to last embodiment (Fig. 1), different is: present embodiment at the normal sensibility yield value (step 13A) that obtains preview mode afterwards, and at the normal sensibility yield value (step 13B) that obtains the pattern that captures afterwards, the more extra following steps of carrying out respectively.
After step 13A, produce the normal sensibility yield value that obtains a plurality of preview modes successively with automatic gain control (AGC) circuit, and construction one preview mode (LUT) (the step 15A) that table look-up, to store the normal sensibility yield value of those preview modes.In addition, after step 13B, also be to produce the normal sensibility yield value that obtains a plurality of acquisition patterns successively with automatic gain control (AGC) circuit, and construction one acquisition pattern (LUT) (the step 15B) that table look-up, to store the normal sensibility yield value of those acquisition patterns.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (13)
1. proofread and correct the method that sensitivity gains for one kind, it is characterized in that it may further comprise the steps:
One standard sources is provided;
Under preview mode, proofread and correct an imaging device with this standard sources, to obtain the normal sensibility yield value of a preview mode;
Under the acquisition pattern, proofread and correct this imaging device with this standard sources, to obtain the normal sensibility yield value of an acquisition pattern; And
Determine the gain ratio of the normal sensibility yield value of the normal sensibility yield value of this acquisition pattern and this preview mode;
This imaging device is in when operation, according to this gain ratio in order to the conditions of exposure class of preview mode is pushed into the conditions of exposure of acquisition pattern.
2. the method for correction sensitivity gain according to claim 1 is characterized in that wherein said imaging device is digital camera or digital code camera.
3. the method for correction sensitivity gain according to claim 1 is characterized in that wherein said standard sources is the light source that meets Commission Internationale De L'Eclairage's standard.
4. the method for correction sensitivity gain according to claim 1 is characterized in that wherein said imaging device institute's sensor pixel number under preview mode is the some of institute's sensor pixel number under the acquisition pattern.
5. the method for correction sensitivity gain according to claim 4 is characterized in that wherein said imaging device institute's sensor pixel number under preview mode is the sixth of institute's sensor pixel number under the acquisition pattern.
6. the method for correction sensitivity according to claim 1 gain is characterized in that, behind this gain ratio of decision, also comprises this gain ratio is stored in this imaging device.
7. the method for correction sensitivity gain according to claim 1, it is characterized in that, in the aligning step of the aligning step of above-mentioned preview mode and acquisition pattern, the correcting condition of this imaging device is a default sensitivity, and this standard sources tool one default shading value, make this imaging device have fixedly exposure value, wherein, fixing exposure value=default sensitivity+default shading value.
8. the method for correction sensitivity according to claim 7 gain is characterized in that the conditions of exposure of wherein said preview mode and the conditions of exposure of acquisition pattern comprise f-number and shutter value, wherein, and fixing exposure value=f-number+shutter value.
9. the method for correction sensitivity according to claim 1 gain, resulting this normal sensibility yield value of aligning step that it is characterized in that wherein said preview mode and acquisition pattern are that the automatic gain control unit with this imaging device is produced.
10. the method for correction sensitivity gain according to claim 1 is characterized in that the aligning step of wherein said preview mode obtains a plurality of these normal sensibility yield values.
11. the method for correction sensitivity gain according to claim 10 is characterized in that it also comprises construction one preview mode and tables look-up, to store a plurality of normal sensibility yield values of this preview mode.
12. the method for correction sensitivity gain according to claim 1 is characterized in that the aligning step of wherein said acquisition pattern obtains a plurality of these normal sensibility yield values.
13. the method for correction sensitivity gain according to claim 12 is characterized in that it also comprises construction one acquisition pattern and tables look-up, to store a plurality of normal sensibility yield values of this acquisition pattern.
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| CN111358424A (en) * | 2020-03-17 | 2020-07-03 | 苏州微清医疗器械有限公司 | Fundus imaging brightness adjusting method and fundus camera |
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| AU2003257827A1 (en) * | 2002-08-14 | 2004-03-03 | Konica Minolta Holdings, Inc. | Image input device |
| JP4994825B2 (en) * | 2006-12-22 | 2012-08-08 | キヤノン株式会社 | IMAGING DEVICE, ITS CONTROL METHOD, PROGRAM, AND STORAGE MEDIUM |
| CN101441386B (en) * | 2007-11-20 | 2010-09-29 | 鸿富锦精密工业（深圳）有限公司 | Photographing method and device |
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| CN111358424A (en) * | 2020-03-17 | 2020-07-03 | 苏州微清医疗器械有限公司 | Fundus imaging brightness adjusting method and fundus camera |
| CN111358424B (en) * | 2020-03-17 | 2022-10-25 | 苏州微清医疗器械有限公司 | Fundus imaging brightness adjusting method and fundus camera |
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