CN102645816B - Exposure parameter correcting method and imaging device - Google Patents
Exposure parameter correcting method and imaging device Download PDFInfo
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- CN102645816B CN102645816B CN201110040204.4A CN201110040204A CN102645816B CN 102645816 B CN102645816 B CN 102645816B CN 201110040204 A CN201110040204 A CN 201110040204A CN 102645816 B CN102645816 B CN 102645816B
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Abstract
The invention relates to an exposure parameter correcting method and an imaging device. The exposure parameter correcting method comprises the following steps of: according to a first light sensitivity degree and pre-set time, respectively executing an image capturing step of a capturing mode by first exposure time and second exposure time so as to obtain a first image and a second image; carrying out image calculation on the first image and the second image to obtain a differential image; and replacing the first light sensitivity degree by a second light sensitivity degree and recording the second light sensitivity degree.
Description
Technical field
The present invention relates to a kind of imaging device, particularly relate to a kind of exposure parameter correction method.
Background technology
Image Sensor is an important component of imaging device, in order to light signal is converted to electric signal, carries out follow-up process in order to processing unit.But Image Sensor, because of property difference, can cause light sensitivity non-maintenance between preview mode and acquisition pattern in an absolute fixed relationship.Therefore, the light sensitivity needing to correct preview mode and acquisition pattern is respectively had.
The spectrum assignment of preview mode uses electronic shutter, and the spectrum assignment capturing pattern is then use mechanical shutter.The accuracy of mechanical shutter is lower because, mechanical shutter from close until completely close need a period of time, be called the time delay of mechanical shutter.Mechanical shutter all mutual difference of each imaging device, therefore, must correct the mechanical shutter of each imaging device, makes it reach exposure accurately.
The correction program of above-mentioned mechanical shutter need according to correct light sensitivity.On the other hand, the correction of above-mentioned light sensitivity then needed according to the correct mechanical shutter delay time.In other words, the correction of mechanical shutter and light sensitivity all needs to rely on the other side provides an exact value as foundation, just can reach and correct result accurately.The correction of heritage luminosity is that use one is preset the mechanical shutter delay time and carried out correction program.According to aforementioned known, usually and the mechanical shutter of actual imaging device not meeting, therefore, the correction result of heritage luminosity must be corrected result to this predetermined time delay accurately.
As can be seen here, above-mentioned existing light sensitivity bearing calibration with in use in structure, obviously still has inconvenience and defect, and is urgently further improved.In order to solve above-mentioned Problems existing, relevant manufactures there's no one who doesn't or isn't seeks solution painstakingly, but have no applicable design for a long time to be completed by development, and common product does not have appropriate structure to solve the problem, this is obviously the anxious problem for solving of relevant dealer always.Therefore how to found a kind of novel exposure parameter correction method and imaging device, in order to solve the awkward puzzlement that heritage photometric calibration and mechanical shutter correct, belong to one of current important research and development problem in fact, also become the target that current industry pole need be improved.
Summary of the invention
The object of the invention is to, a kind of correction method and imaging device of exposure parameter is provided, in order to remove the impact that the mechanical shutter delay time corrects for light sensitivity, and obtained correct light sensitivity corrected value.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of exposure parameter correction method that the present invention proposes, it comprises following steps: according to one first light sensitivity and a Preset Time, an image capture step of an acquisition pattern is performed respectively, to obtain one first image and one second image by one first time shutter and one second time shutter; This first image and this second image are carried out an image computing, to obtain a differential images; And replace this first light sensitivity with one second light sensitivity, and record this second light sensitivity.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid exposure parameter correction method, wherein after this second light sensitivity replaces this first light sensitivity, more comprise: according to this second light sensitivity and this Preset Time, this image capture step is repeated respectively, until a luminance parameter of this differential images reaches one first threshold value with this first time shutter and this second time shutter.
Aforesaid exposure parameter correction method, it more comprises: according to one the 3rd light sensitivity and one the 3rd time shutter, perform a preview step of a preview mode, to obtain a preview image; And replace the 3rd light sensitivity with a preview light sensitivity, and repeat this preview step with the 3rd time shutter, until a brightness of this preview image reaches one second threshold value.
Aforesaid exposure parameter correction method, wherein said preview step controls an electronic shutter to obtain this preview image.
Aforesaid exposure parameter correction method, wherein said Preset Time is a time delay of a mechanical shutter.
Aforesaid exposure parameter correction method, it more comprises: according to this second light sensitivity and this preview light sensitivity, to perform a compensation process of this time delay, in order to correction this time delay one time delay deviate.
Aforesaid exposure parameter correction method, wherein said compensation process comprises: obtain an acquisition pattern image according to this second light sensitivity, and obtain a preview mode image according to this preview light sensitivity; And adjust this time delay, repeat to obtain this acquisition pattern image and this preview mode image, until the absolute value of the luminance difference of this acquisition pattern image and this preview mode image is less than one the 3rd threshold value.
Aforesaid exposure parameter correction method, the second wherein said light sensitivity is corresponding to an acquisition pattern light sensitivity yield value, and this preview light sensitivity is corresponding to a preview mode light sensitivity yield value.
Aforesaid exposure parameter correction method, it more comprises: according to this acquisition pattern light sensitivity yield value and this preview mode light sensitivity yield value, construction one light sensitivity gain statistical form.
Aforesaid exposure parameter correction method, the second wherein said time shutter is two times of this first time shutter.
The object of the invention to solve the technical problems also realizes by the following technical solutions.According to a kind of imaging device that the present invention proposes, it comprises: an image sensing unit, in order to light signal is converted to electric signal; One electronic shutter, controls the exposure of this image sensing unit under a preview mode; One mechanical shutter, under an acquisition pattern, control the time shutter of this image sensing unit, wherein this mechanical shutter has a time delay; And an arithmetic center, correct in order to the light sensitivity performing this image sensing unit; Wherein this arithmetic center is according to one first light sensitivity and a Preset Time, performs an image capture step of this acquisition pattern with one first time shutter and one second time shutter respectively, and obtains one first image and one second image respectively; Image computing is carried out, to obtain a differential images to this first image and this second image; And replace this first light sensitivity with one second light sensitivity.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid imaging device, wherein said arithmetic center is after this second light sensitivity replaces this first light sensitivity, more comprise: according to this second light sensitivity and this Preset Time, this image capture step is repeated respectively, until a luminance parameter of this differential images reaches one first threshold value with this first time shutter and this second time shutter.
Aforesaid imaging device, wherein said arithmetic center is according to one the 3rd light sensitivity and one the 3rd time shutter, perform a preview step of this preview mode, to obtain a preview image, and replace the 3rd light sensitivity with a preview light sensitivity, and repeat this preview step with the 3rd time shutter, until a brightness of this preview image reaches one second threshold value.
Aforesaid imaging device, wherein said Preset Time is a time delay of this mechanical shutter, and this arithmetic center according to this second light sensitivity and this preview light sensitivity to perform a compensation process of this Preset Time.
Aforesaid imaging device, wherein said compensation process comprises: according to this second light sensitivity and this preview light sensitivity, obtains an acquisition pattern image and a preview mode image; And adjust this time delay, lay equal stress on and regain this acquisition pattern image and this preview mode image, until the absolute value of the luminance difference of this acquisition pattern image and this preview mode image is less than one the 3rd threshold value.
Aforesaid imaging device, the second wherein said light sensitivity is corresponding to an acquisition pattern light sensitivity yield value, this preview light sensitivity is corresponding to a preview mode light sensitivity yield value, and this arithmetic center is according to this acquisition pattern light sensitivity yield value and this preview mode light sensitivity yield value, construction one light sensitivity gain statistical form.
Aforesaid imaging device, it more comprises a storage element, in order to store this time delay, this first light sensitivity, this second light sensitivity, the 3rd light sensitivity, this preview light sensitivity and this light sensitivity gain statistical form.
The present invention compared with prior art has obvious advantage and beneficial effect.By technique scheme, exposure parameter correction method of the present invention and imaging device at least have following advantages and beneficial effect: the present invention in order to remove the impact that the mechanical shutter delay time corrects for light sensitivity, and can be obtained correct light sensitivity corrected value.
In sum, the present invention according to the first light sensitivity and Preset Time, can perform the image capture step of acquisition pattern, to obtain the first image and the second image respectively by the first time shutter and the second time shutter.First image and the second image are carried out image computing, to obtain differential images.Replace the first light sensitivity with the second light sensitivity, and record the second light sensitivity.The present invention has significant progress technically, and has obvious good effect, is really a new and innovative, progressive, practical new design.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of instructions, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 shows the system block diagrams of the imaging device of the embodiment of the present invention.
Fig. 2 A shows the process flow diagram of the exposure parameter correction method of the embodiment of the present invention.
Fig. 2 B shows the detail flowchart of the compensation process of Fig. 2 A.
Fig. 3 A, Fig. 3 B and Fig. 3 C illustrate the sequential chart of the first image, the second image and differential images respectively.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to the exposure parameter correction method proposed according to the present invention and its embodiment of imaging device, structure, feature and effect thereof, be described in detail as follows.
Fig. 1 shows the system block diagrams of the imaging device of the embodiment of the present invention.This imaging device can for having the camera of image acquisition function, video camera, mobile phone, personal digital assistant, digital music player, network camera or image capture and test macro, but not as limit.
Consult Fig. 1, in the present embodiment, imaging device mainly comprises image sensing unit 10, electronic shutter 12, mechanical shutter 14, arithmetic center 16 and storage element 18.Image sensing unit 10 is in order to be converted to electric signal by light signal, and this image sensing unit 10 can be charge coupled cell or CMOS (Complementary Metal Oxide Semiconductor) image sensor, but not as limit.Electronic shutter 12 can control the exposure of image sensing unit 10 under preview mode and acquisition pattern, the time shutter of image sensing unit 10 is controlled under mechanical shutter 14 can be used for acquisition pattern, in the present embodiment, mechanical shutter 14 is only adopted to control the exposure of image sensing unit 10 under acquisition pattern, but not as limit.Wherein, with electronic shutter 12 unlike, because mechanical shutter 14 adopts mechanical component, therefore, mechanical shutter 14 from close until close often need a period of time completely, at this, this shut-in time is defined as the time delay of mechanical shutter 14.Specifically, within time delay, because mechanical shutter 14 is closed not yet completely, therefore still have light beam and be incident to imaging device, and receive by image sensing unit 10.
Consult Fig. 1 again, under arithmetic center 16 self imaging sensing cell 10 receives acquisition pattern or the image captured under preview mode, correct with the light sensitivity performing image sensing unit 10.Wherein arithmetic center 16 can be CPU (central processing unit), digital signal processing unit or Graphics Processing Unit, but is not limited to this; The parameter that storage element 18 produces in order to store initial parameter needed for arithmetic center 16 and arithmetic center 16.Wherein storage element 18 can be built-in in the storage arrangement of imaging device or removable, such as flash memory, but is not limited to this.
Fig. 2 A shows the process flow diagram of the exposure parameter correction method of the embodiment of the present invention.This exposure parameter correction method is applicable to the imaging device shown in Fig. 1, is also applicable to the system that other have imaging function.Below exposure parameter correction method is described, please refer to Fig. 1 and Fig. 2 A.Under acquisition pattern, first, in step 21A, arithmetic center 16, according to the first light sensitivity and Preset Time, performs image capture step with the first time shutter, and obtains the first image, and in the present embodiment, Preset Time is the time delay adopting mechanical shutter 14.After step 21A, arithmetic center 16, in step 21B, according to the time delay of the first light sensitivity and mechanical shutter 14, performs image capture step with the second time shutter, and obtains the second image.Specifically, step 21B also can complete before step 21A, and in fact, second time shutter and the first time shutter unequal, in the present embodiment, took the second time shutter as two times of the first time shutter, but not as limit, in addition, the first light sensitivity initial value that can be built-in preset value or be keyed in by user.
Consult Fig. 1 and 2A figure again, then, in step 22, the first image and the second image are carried out image computing by arithmetic center 16, to obtain a differential images simultaneously.In the present embodiment, this image computing carries out additive operation to the parameter of image, such as, the brightness value of the pixel of the second image deducted the brightness value of the respective pixel of the first image, to obtain the differential images of the luminance difference with each pixel.Next, in step 23, judge whether the luminance difference of each pixel in differential images reaches one and preset the first threshold value.If judged result is negative, then enters step 24, replace the first original light sensitivity to reach the renewal of light sensitivity with one second light sensitivity, and record the second light sensitivity in storage element 18.Wherein, if the brightness of each pixel lower than default first threshold value, then tunes up light sensitivity, replaces it with the second light sensitivity being greater than the first light sensitivity in differential images; In like manner, if the brightness of each pixel higher than default first threshold value, is then turned light sensitivity down, replaced it with the second light sensitivity being less than the first light sensitivity in differential images.Moreover, according to the second light sensitivity and time delay, repeat the image capture step of step 21A and 21B respectively with the first time shutter and the second time shutter, until the luminance difference of each pixel reaches the first threshold value of step 23 in the differential images that produces of step 22.
Fig. 3 A and Fig. 3 B illustrates the sequential chart of the first image and the second image respectively, please refer to Fig. 1.As shown in Figure 3A, the total exposure time of the first image be the first time shutter T, mechanical shutter 14 predetermined time delay t and time delay deviate Δ t's and, and the actual delay time be predetermined time delay t and time delay deviate Δ t's and.Fig. 3 A also shows only according to the preset state of the mechanical shutter 14 of predetermined time delay t, and display is according to the virtual condition of the mechanical shutter 14 of both predetermined time delay t and time delay deviate Δ t.As shown in Figure 3 B, the total exposure time of the second image be the second time shutter 2T, mechanical shutter 14 predetermined time delay t and time delay deviate Δ t's and, and the actual delay time be predetermined time delay t and time delay deviate Δ t's and.Wherein, the predetermined time delay t of same mechanical shutter 14 and time delay deviate Δ t be certain value, and predetermined time delay t is the outline rough estimate value of mechanical shutter 14, time delay then can there is a little difference because of different mechanical shutters 14 in deviate Δ t.Fig. 3 B also shows only according to the preset state of the mechanical shutter 14 of predetermined time delay t, and display is according to the virtual condition of the mechanical shutter 14 of both predetermined time delay t and time delay deviate Δ t.
Moreover Fig. 3 C illustrates the sequential chart of differential images.Consult Fig. 1 and Fig. 3 C simultaneously, because the embodiment of the present invention uses same mechanical shutter 14 to carry out re-expose, and regain the first image and the second image, therefore, when the brightness value of the pixel of the second image deducts the brightness value of the respective pixel of the first image, the error that the predetermined time delay of mechanical shutter 14 and time delay, deviate caused can be removed by offseting.
Continue to consult Fig. 1 and Fig. 2 A, before or after step 21A, 21B, 22,23,24, the exposure parameter correction method of the present embodiment more comprises following preview mode step.In step 25, according to the 3rd light sensitivity and the 3rd time shutter, perform the preview step of preview mode, to obtain a preview image.In this preview step, be utilize electronic shutter 12 to control image sensing unit 10, to obtain preview image.Then, in step 26, judge whether the brightness of preview image reaches default second threshold value.If judged result is negative, then enter step 27, replace renewal the 3rd light sensitivity with a preview light sensitivity, and repeat the preview step of step 25 with the 3rd time shutter, until the brightness of preview image reaches default second threshold value.Wherein, the initial value that 3rd light sensitivity can be built-in preset value or be keyed in by user, and the 3rd light sensitivity under preview mode can adopt the first light sensitivity under acquisition pattern, or the first light sensitivity is deducted default one and estimate difference, using as the 3rd light sensitivity.
Continue to consult Fig. 1 and Fig. 2 A.In the present embodiment, the second light sensitivity obtained can corresponding to comprising an acquisition pattern light sensitivity yield value, and the preview light sensitivity obtained can corresponding to comprising a preview mode light sensitivity yield value.Wherein, above-mentioned time delay, the first light sensitivity, the second light sensitivity, the 3rd light sensitivity and preview light sensitivity can be stored in storage element 18.When the judged result of step 23 and step 26 is respectively be, then enter step 28, light sensitivity gain statistical form according to capturing pattern light sensitivity yield value and preview mode light sensitivity yield value, construction one light sensitivity gain statistical form, and can be stored in storage element 18 by arithmetic center 16.Next, in step 29, arithmetic center 16 according to the second light sensitivity and preview light sensitivity, to perform the compensation process of time delay, in order to the error of the shut-in time of this mechanical shutter 14 of correction.
Fig. 2 B shows the detail flowchart of Fig. 2 A compensation process, please refer to Fig. 1.In step 291, according to the second light sensitivity and preview light sensitivity, obtain acquisition pattern image and preview mode image respectively.Then, in step 292, judge whether the absolute value of the luminance difference of acquisition pattern image and preview mode image is less than one the 3rd threshold value.If judged result for negative, then enter step 293, adjustment mechanical shutter 14 time delay, and according to this repeated execution of steps 291 to obtain acquisition pattern image and preview mode image, until the judged result of step 292 is yes.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (17)
1. an exposure parameter correction method, is characterized in that it comprises following steps:
A time delay according to a mechanical shutter sets a Preset Time, and utilize one first light sensitivity and this Preset Time, an image capture step of an acquisition pattern is performed respectively, to obtain one first image and one second image by one first time shutter and one second time shutter;
This first image and this second image are carried out an image computing, to obtain a differential images; And
Replace this first light sensitivity with one second light sensitivity, and record this second light sensitivity.
2. exposure parameter correction method according to claim 1, is characterized in that, wherein after this second light sensitivity replaces this first light sensitivity, more comprising:
According to this second light sensitivity and this Preset Time, repeat this image capture step with this first time shutter and this second time shutter respectively, until a luminance parameter of this differential images reaches one first threshold value.
3. exposure parameter correction method according to claim 1 and 2, is characterized in that it more comprises:
According to one the 3rd light sensitivity and one the 3rd time shutter, perform a preview step of a preview mode, to obtain a preview image; And
Replace the 3rd light sensitivity with a preview light sensitivity, and repeat this preview step with the 3rd time shutter, until a brightness of this preview image reaches one second threshold value.
4. exposure parameter correction method according to claim 3, is characterized in that wherein said preview step controls an electronic shutter to obtain this preview image.
5. exposure parameter correction method according to claim 3, is characterized in that wherein said Preset Time is a time delay of a mechanical shutter.
6. exposure parameter correction method according to claim 5, is characterized in that it more comprises:
According to this second light sensitivity and this preview light sensitivity, to perform a compensation process of this time delay, in order to correction this time delay one time delay deviate.
7. exposure parameter correction method according to claim 6, is characterized in that wherein said compensation process comprises:
Obtain an acquisition pattern image according to this second light sensitivity, and obtain a preview mode image according to this preview light sensitivity; And
Adjust this time delay, repeat to obtain this acquisition pattern image and this preview mode image, until the absolute value of the luminance difference of this acquisition pattern image and this preview mode image is less than one the 3rd threshold value.
8. exposure parameter correction method according to claim 3, it is characterized in that the second wherein said light sensitivity is corresponding to an acquisition pattern light sensitivity yield value, and this preview light sensitivity is corresponding to a preview mode light sensitivity yield value.
9. exposure parameter correction method according to claim 8, is characterized in that it more comprises:
According to this acquisition pattern light sensitivity yield value and this preview mode light sensitivity yield value, construction one light sensitivity gain statistical form.
10. exposure parameter correction method according to claim 1, is characterized in that the second wherein said time shutter is two times of this first time shutter.
11. 1 kinds of imaging devices, is characterized in that it comprises:
One image sensing unit, in order to be converted to electric signal by light signal;
One electronic shutter, controls the exposure of this image sensing unit under a preview mode;
One mechanical shutter, under an acquisition pattern, control the time shutter of this image sensing unit, wherein this mechanical shutter has a time delay; And
One arithmetic center, corrects in order to the light sensitivity performing this image sensing unit;
Wherein this arithmetic center sets a Preset Time according to a time delay of a mechanical shutter, and utilize one first light sensitivity and this Preset Time, perform an image capture step of this acquisition pattern with one first time shutter and one second time shutter respectively, and obtain one first image and one second image respectively; Image computing is carried out, to obtain a differential images to this first image and this second image; And replace this first light sensitivity with one second light sensitivity.
12. imaging devices according to claim 11, it is characterized in that wherein said arithmetic center is after this second light sensitivity replaces this first light sensitivity, more comprise: according to this second light sensitivity and this Preset Time, this image capture step is repeated respectively, until a luminance parameter of this differential images reaches one first threshold value with this first time shutter and this second time shutter.
13. imaging devices according to claim 11 or 12, it is characterized in that wherein said arithmetic center is according to one the 3rd light sensitivity and one the 3rd time shutter, perform a preview step of this preview mode, to obtain a preview image, and replace the 3rd light sensitivity with a preview light sensitivity, and repeat this preview step with the 3rd time shutter, until a brightness of this preview image reaches one second threshold value.
14. imaging devices according to claim 13, is characterized in that wherein said Preset Time is a time delay of this mechanical shutter, and this arithmetic center according to this second light sensitivity and this preview light sensitivity to perform a compensation process of this Preset Time.
15. imaging devices according to claim 14, is characterized in that wherein said compensation process comprises:
According to this second light sensitivity and this preview light sensitivity, obtain an acquisition pattern image and a preview mode image; And
Adjust this time delay, lay equal stress on and regain this acquisition pattern image and this preview mode image, until the absolute value of the luminance difference of this acquisition pattern image and this preview mode image is less than one the 3rd threshold value.
16. imaging devices according to claim 13, it is characterized in that the second wherein said light sensitivity is corresponding to an acquisition pattern light sensitivity yield value, this preview light sensitivity is corresponding to a preview mode light sensitivity yield value, and this arithmetic center is according to this acquisition pattern light sensitivity yield value and this preview mode light sensitivity yield value, construction one light sensitivity gain statistical form.
17. imaging devices according to claim 16, is characterized in that it more comprises a storage element, in order to store this time delay, this first light sensitivity, this second light sensitivity, the 3rd light sensitivity, this preview light sensitivity and this light sensitivity gain statistical form.
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| CN111316635B (en) * | 2019-03-12 | 2022-01-25 | 深圳市大疆创新科技有限公司 | Camera control method and device |
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