CN102111559B - Method for correcting sensitivity gain - Google Patents
Method for correcting sensitivity gain Download PDFInfo
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- CN102111559B CN102111559B CN200910215512A CN200910215512A CN102111559B CN 102111559 B CN102111559 B CN 102111559B CN 200910215512 A CN200910215512 A CN 200910215512A CN 200910215512 A CN200910215512 A CN 200910215512A CN 102111559 B CN102111559 B CN 102111559B
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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 photosensitivity 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) with the definite value mode.Yet, maybe 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 type suitable conditions of exposure of release ideally.Moreover, when many production lines are produced simultaneously, also maybe 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 photosensitivity 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 photosensitivity of imaging device, and the photosensitivity tool height consistency of the imaging device of guaranteeing to be produced.
The object of the invention and solve its technical problem and adopt following technical scheme to realize.The method of a kind of correction photosensitivity 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 imaging (imaging) device with this standard sources, to obtain the standard photosensitivity yield value of a preview mode; Under acquisition (capture) pattern, proofread and correct this imaging device with this standard sources, to obtain the standard photosensitivity yield value of an acquisition pattern; And the gain ratio of the standard photosensitivity yield value of the standard photosensitivity 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 and solve its technical problem and also can adopt following technical measures further to realize.
The method of aforesaid correction photosensitivity gain, wherein said imaging device is digital camera or digital code camera.
The method of aforesaid correction photosensitivity gain, wherein said standard sources is for meeting the light source of Commission Internationale De L'Eclairage (CIE) standard.
The method of aforesaid correction photosensitivity 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 photosensitivity 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 photosensitivity gain after decision should gain ratio, also comprises this gain ratio is stored in this imaging device.
The method of aforesaid correction photosensitivity 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 preset photosensitivity (Sv; And this standard sources tool one preset shading value (Bv, luminance value) speed value); By this, make this imaging device have fixedly exposure value (Ev, exposure value); That is, Ev=Bv+Sv.
The method of aforesaid correction photosensitivity gain, the conditions of exposure of the conditions of exposure of wherein said preview mode and acquisition pattern comprises f-number (Av, aperture value) and shutter value (Tv, time value), and it meets Ev=Av+Tv.
The method of aforesaid correction photosensitivity gain, resulting this standard photosensitivity 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 photosensitivity gain, the aligning step of wherein said preview mode obtains a plurality of these standard photosensitivity yield values.
The method of aforesaid correction photosensitivity gain, its also comprise construction one preview mode table look-up (lookup table, LUT), to store a plurality of standard photosensitivity yield values of this preview mode.
The method of aforesaid correction photosensitivity gain, the aligning step of wherein said acquisition pattern obtains a plurality of these standard photosensitivity yield values.
The method of aforesaid correction photosensitivity gain, it also comprises construction one acquisition pattern tables look-up (LUT), to store a plurality of standard photosensitivity yield values of this acquisition pattern.
The present invention compared with prior art has tangible advantage and beneficial effect.Know by above,, the invention provides a kind of method of proofreading and correct the photosensitivity gain, a standard sources at first is provided for achieving the above object.Under preview mode, proofread and correct imaging (imaging) device with standard sources, to obtain the standard photosensitivity yield value of a preview mode.Be under the acquisition pattern, with standard sources correcting imaging device, to obtain the standard photosensitivity yield value of an acquisition pattern.The gain ratio of the standard photosensitivity yield value of decision acquisition pattern and the standard photosensitivity 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 standard photosensitivity yield values of preview mode, reaches construction one acquisition pattern and tables look-up, with a plurality of standard photosensitivity yield values of storage retrieval pattern.
By technique scheme, the method that the present invention proofreaies and correct the photosensitivity gain has advantage and beneficial effect at least:
The method of correction photosensitivity 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 photosensitivity that promotes imaging device, and the conforming effect of photosensitivity tool height of the imaging device of guaranteeing to be produced.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention; Understand technological means of the present invention in order can more to know; And can implement according to the content of specification, and for let of the present invention above-mentioned with other purposes, feature and advantage can be more obviously understandable, below special act preferred embodiment; And conjunction with figs., specify as follows.
Description of drawings
Fig. 1 is the flow chart that the present invention proofreaies and correct method one embodiment of photosensitivity gain.
Fig. 2 is the flow chart that the present invention proofreaies and correct another embodiment of method of photosensitivity 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; To its embodiment of method, structure, step, characteristic and the effect thereof of the correction photosensitivity gain that proposes according to the present invention, specify as after.
Seeing also shown in Figure 1ly, is the flow chart that the present invention proofreaies and correct method one embodiment of photosensitivity gain.One embodiment of the invention is proofreaied and correct the method for photosensitivity gain, at first, in step 11, a standard sources (light source) is provided, for example the standard light box.Standard sources can be, but not be defined as Commission Internationale De L'Eclairage (Commission internationale de 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, to obtain the standard photosensitivity yield value (sensitivity gain) of 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 get into preview mode when the shutter release button (shutter button) of the digital camera half that is pressed.The photosensitivity yield value of the alleged preview mode of this specification; Be meant under the preset shading value (or brightness value) of standard sources; Corresponding to a certain preset photosensitivity (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 of Photographic Exposure, exposure equation formula APEX) is done explanation as follows.If preset photosensitivity is with Sv (being called velocity amplitude (speed value) again) expression, the preset shading value of standard sources is with Bv (luminance value) expression, by this, will make fixedly exposure value Ev (exposure value) 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 standard photosensitivity 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 get into the acquisition pattern with digital camera alignment criteria light source.Be similar to the situation of preview mode; The photosensitivity yield value of acquisition pattern; Be meant under the preset shading value (or brightness value) of standard sources; Corresponding to a certain preset photosensitivity (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 under preview mode, to proofread and correct out the photosensitivity yield value, with six as gain ratio, extrapolates the photosensitivity 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, above-mentioned traditional digital cameras a type acquisition exposure mode condition of releasing will be optimum exposure condition.Yet in fact, different digital cameras maybe be because of the otherness of CIS (for example charge coupled cell), optical mirror slip or other optics/electronic components, thereby causes the inconsistent of photosensitivity, and then influences image quality.
For avoiding this problem; Present embodiment is in step 13, and the ratio of the standard photosensitivity yield value of decision acquisition pattern and the standard photosensitivity 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) possibly 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 photosensitivity gain.The process step of present embodiment is similar to last embodiment (Fig. 1); Different is: present embodiment at the standard photosensitivity yield value (step 13A) that obtains preview mode afterwards; And at the standard photosensitivity 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 standard photosensitivity 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 standard photosensitivity yield value of those preview modes.In addition; After step 13B; Also be to produce the standard photosensitivity 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 standard photosensitivity yield value of those acquisition patterns.
The above only is preferred embodiment of the present invention, is not 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 limiting the present invention, anyly be familiar with the professional and technical personnel, in not breaking away from technical scheme scope of the present invention; When the method for above-mentioned announcement capable of using 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 scheme of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (13)
1. proofread and correct the method that photosensitivity 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 standard photosensitivity yield value of a preview mode;
Under the acquisition pattern, proofread and correct this imaging device with this standard sources, to obtain the standard photosensitivity yield value of an acquisition pattern; And
The gain ratio of the standard photosensitivity yield value that determines this acquisition pattern and the standard photosensitivity yield value of 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 photosensitivity 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 photosensitivity 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 photosensitivity 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 photosensitivity 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 photosensitivity according to claim 1 gain is characterized in that, after decision should gain ratio, also comprises this gain ratio is stored in this imaging device.
7. the method for correction photosensitivity 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 preset photosensitivity; And this standard sources tool one preset shading value; Make this imaging device have fixedly exposure value, wherein, fixing exposure value=preset photosensitivity+preset shading value.
8. the method for correction photosensitivity 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 photosensitivity according to claim 1 gain, resulting this standard photosensitivity 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 photosensitivity gain according to claim 1 is characterized in that the aligning step of wherein said preview mode obtains a plurality of these standard photosensitivity yield values.
11. the method for correction photosensitivity 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 standard photosensitivity yield values of this preview mode.
12. the method for correction photosensitivity gain according to claim 1 is characterized in that the aligning step of wherein said acquisition pattern obtains a plurality of these standard photosensitivity yield values.
13. the method for correction photosensitivity 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 standard photosensitivity yield values of this acquisition pattern.
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Citations (3)
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|---|---|---|---|---|
| CN1674825A (en) * | 2002-08-14 | 2005-09-28 | 柯尼卡美能达控股株式会社 | Image input device |
| CN101207830A (en) * | 2006-12-22 | 2008-06-25 | 佳能株式会社 | Image capture apparatus and control method thereof |
| CN101441386A (en) * | 2007-11-20 | 2009-05-27 | 鸿富锦精密工业（深圳）有限公司 | Photographing method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1674825A (en) * | 2002-08-14 | 2005-09-28 | 柯尼卡美能达控股株式会社 | Image input device |
| CN101207830A (en) * | 2006-12-22 | 2008-06-25 | 佳能株式会社 | Image capture apparatus and control method thereof |
| CN101441386A (en) * | 2007-11-20 | 2009-05-27 | 鸿富锦精密工业（深圳）有限公司 | Photographing method and device |
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