CN104301622B - A kind of Space-based Space Imagewise exposure time self-adaptation control method and device - Google Patents
A kind of Space-based Space Imagewise exposure time self-adaptation control method and device Download PDFInfo
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Abstract
A kind of Space-based Space Imagewise exposure time self-adaptation control method and device, method include the comentropy for 1) calculating the correspondence image according to acquired in default most long, middle and minimum exposure time；2) theoretical optimum exposure time is obtained by weighted average mode according to all described information entropys, and then immediate one grade of time for exposure is chosen as current optimum exposure time in shelves of default time for exposure, and record the times of acquisition of the current optimum exposure time；3) judge whether the times of acquisition are less than or equal to predetermined threshold value, if so, then performing step 4), otherwise perform step 6)；4) comentropy of the correspondence image according to acquired in current optimum exposure time is calculated；5) most long, middle gear and minimum exposure time are updated according to current optimum exposure time, and updates corresponding comentropy, and return to execution step 2)；6) control image camera is persistently imaged using current optimum exposure time as optimum exposure time to extraterrestrial target.
Description
Technical field
The present invention relates to Space-based Space imaging field, more particularly to a kind of exposure realized based on comentropy to camera
The Space-based Space Imagewise exposure time self-adaptation control method and device of time Self Adaptive Control.
Background technology
Under the constraint of space-based image-forming condition, the abundant degree of gradation of image level depends on Sensor Design dynamic in itself
State scope.If the dynamic range of Sensor Design is set, then the reasonable selection time for exposure, sensor is given full play in itself
Performance, enables to picture material to enrich the most.
At present, the conventional time for exposure autocontrol method of business camera has central average metering, Partial metering and point
Exposure Metering.It is the most frequently used when that is, using conventional shoot, to shoot and be located at field of view center main body more for central average metering, so that
The gray value weighted average of picture centre region is taken to be inputted as the parameter for choosing the time for exposure.This method, if subject
Body is not on field of view center or shot under backlighting condition, just inapplicable.Partial metering is a certain part to image
Light-metering is carried out, processing mode is similar to central average metering, and the region only chosen is different.Spot light-metering mode is then to use to regard
The very low range region of center court one is as Expose f iotaducials point, so as to carry out the automatic setting of current exposure time.But, in space-based
Whether imaging field, be located at field of view center in uncertain subject, and subject may be only present in image planes and not know
A certain local location in the state of, above-mentioned conventional time for exposure autocontrol method is not applied to simultaneously.
In addition, current also have following several ways what is ground：One kind for storage 12 groups of correction parameters, using LMS filtering and
The feedback quantity of scene constantly realizes the adaptive adjustment of the time of integration；But this method needs multiple time of integration adjustment
Suitable state can be reached, is unfavorable for processing in real time.Second is to be obtained by blackbody demarcation experiment under each time of integration
Correction parameter is simultaneously stored, and is selected suitably to correct parameter according to the threshold value of setting during correction to realize integration
The switching of time；This method needs to shift to an earlier date given threshold according to calibration experiment result.The third is to use corrected neural network
Algorithm, sets rational threshold value and divides the time of integration, and stores the background image under the different times of integration, by the original of detector
Output subtracts the background image under the associated quad time as the input of neutral net, so as to realize that the adaptive of the time of integration cuts
Change；These algorithms are relative complex, and real-time is not good.
The content of the invention
It is an object of the present invention to which the time for exposure autocontrol method commonly used for existing business camera is not suitable for day
The time for exposure control of base extraterrestrial target imaging, and in the time for exposure relative complex real-time of autocontrol method algorithm ground not
Good the problem of, there is provided a kind of Space-based Space Imagewise exposure time self-adaptation control method and device, utilizes image overall
Content, the time for exposure Self Adaptive Control realized to camera is chosen by the reasonable time for exposure, so that the figure obtained
As content is enriched the most.
To achieve the above object, the invention provides a kind of Space-based Space Imagewise exposure time Self Adaptive Control side
Method, including, (1) is calculated according to acquired in default most long time for exposure, middle gear time for exposure and minimum exposure time
The comentropy of correspondence image；(2) theoretical optimum exposure time is obtained by weighted average mode according to all described information entropys, entered
And immediate one grade of time for exposure is chosen as current in shelves of default time for exposure according to the theoretical optimum exposure time
Optimum exposure time, and record the times of acquisition of the current optimum exposure time；(3) judge whether the times of acquisition are less than
Equal to predetermined threshold value, if so, then performing step (4), step (6) is otherwise performed；(4) calculate according to current optimum exposure time institute
The comentropy of the correspondence image of acquisition；(5) most long time for exposure, middle gear time for exposure are updated according to current optimum exposure time
And minimum exposure time, and corresponding comentropy is updated, and return to execution step (2)；(6) control image camera is with current
Optimum exposure time is persistently imaged as optimum exposure time to extraterrestrial target.
To achieve the above object, present invention also offers a kind of Space-based Space Imagewise exposure time Self Adaptive Control dress
Put, including a comentropy computing unit, a current optimum exposure time acquiring unit, a judging unit, a updating block and
One imaging control unit；When described information entropy computing unit is used to calculate according to default most long time for exposure, middle gear exposure
Between and minimum exposure time acquired in correspondence image comentropy, and calculate according to acquired in current optimum exposure time
Correspondence image comentropy；The current optimum exposure time acquiring unit is connected with described information entropy computing unit, is used for
Theoretical optimum exposure time is obtained by weighted average mode according to all described information entropys, and then exposed according to the theory is optimal
Immediate one grade of time for exposure is chosen as current optimum exposure time in shelves of default time for exposure between light time, and records institute
State the times of acquisition of current optimum exposure time；The judging unit is connected with the current optimum exposure time acquiring unit,
For judge the times of acquisition whether predetermined threshold value, if so, then call the updating block, otherwise call the imaging control
Unit；The updating block respectively with the judging unit, current the optimum exposure time acquiring unit and described information
Entropy computing unit is connected, for when the times of acquisition are less than or equal to predetermined threshold value, being updated according to current optimum exposure time
Most long time for exposure, middle gear time for exposure and minimum exposure time, and corresponding comentropy is updated, and completed updating
After call the current optimum exposure time acquiring unit；It is described imaging control unit be connected with the judging unit, for
When the times of acquisition are more than predetermined threshold value, control image camera is using current optimum exposure time as optimum exposure time to sky
Between target be persistently imaged.
The advantage of the invention is that：Suitable for Space-based Space imaging, the content of image overall is make use of, by choosing
The reasonable time for exposure, the time for exposure Self Adaptive Control to camera is realized, the image content information of acquisition enriches the most, and algorithm
Simply, real-time is high.
Brief description of the drawings
Fig. 1, the schematic flow sheet of Space-based Space Imagewise exposure time self-adaptation control method of the present invention；
Fig. 2, the flow of the embodiment of Space-based Space Imagewise exposure time self-adaptation control method one of the present invention
Figure；
Fig. 3, the configuration diagram of Space-based Space Imagewise exposure time adaptive controller of the present invention；
Fig. 4, the curve of the corresponding image information changes of entropy of one embodiment of the invention.
Embodiment
According to Shannon information theory, at most, therefore, Space-based Space is imaged acquired image to information content when entropy is maximum
The value of comentropy is bigger, also implies that picture material is abundanter, gray-level is more.The present invention is interior using image overall
Hold, the reasonable time for exposure chosen by iteration based on image information entropy, the time for exposure Self Adaptive Control to camera is realized so that
The acquired image content information of Space-based Space imaging enriches the most.The space-based provided below in conjunction with the accompanying drawings the present invention is empty
Between target imaging time for exposure self-adaptation control method and device elaborate.
With reference to Fig. 1, the flow of Space-based Space Imagewise exposure time self-adaptation control method of the present invention is illustrated
Figure.The method of the invention comprises the following steps.S11：Calculate according to default most long time for exposure, middle gear time for exposure with
And the comentropy of the correspondence image acquired in minimum exposure time；S12：Pass through weighted average mode according to all described information entropys
Theoretical optimum exposure time is obtained, and then chooses closest in shelves of default time for exposure according to the theoretical optimum exposure time
One grade of time for exposure as current optimum exposure time, and record the times of acquisition of the current optimum exposure time；S13：
Judge whether the times of acquisition are less than or equal to predetermined threshold value, if so, then performing step S14, otherwise perform step S16；S14：
Calculate the comentropy of the correspondence image according to acquired in current optimum exposure time；S15：Updated according to current optimum exposure time
Most long time for exposure, middle gear time for exposure and minimum exposure time, and update corresponding comentropy, and return and perform step
Rapid S12；S16：Control image camera is continued into using current optimum exposure time as optimum exposure time to extraterrestrial target
Picture.The method of the invention is described in detail below.
S11：Calculate according to acquired in default most long time for exposure, middle gear time for exposure and minimum exposure time
The comentropy of correspondence image.
Target satellite position is determined according to the track and inventory data base information of present satellites by ground control centre, defended
Star posture guidance law, camera imaging beginning and ending time and other relevant operating parameters.When satellite enters TT ＆ c arc, pass through star
Parameter is noted on ground link.Into task segmental arc, satellite Star Service is scheduled according to flow of task, and image camera is started working, from
It is dynamic that corresponding image is obtained according to default most long time for exposure, middle gear time for exposure and minimum exposure time.It is afterwards
Acquired correspondence image can be calculated, obtain corresponding informance entropy, comentropy illustrates the average information of video source.
For example, calculating Space-based Space image g, corresponding comentropy H (g) is obtained：
Wherein N is total tonal gradation of image, PkFor the pixel of the probability distribution of some gray scale of image, the i.e. tonal gradation
The shared ratio in entire image.
S12：Theoretical optimum exposure time is obtained by weighted average mode according to all described information entropys, and then according to institute
State theoretical optimum exposure time and immediate one grade of time for exposure is chosen in shelves of default time for exposure as current optimal exposure
Time, and record the times of acquisition of the current optimum exposure time.
Theoretical optimum exposure time is obtained according to all described information entropys by weighted average mode to further comprise：1) count
Calculate the summation of the comentropy of most long time for exposure, middle gear time for exposure and minimum exposure time correspondence image；2) count respectively
Calculate the comentropy of respective image and the ratio of the summation；23) according to the summation and corresponding ratio, to the most long time for exposure,
Middle gear time for exposure and minimum exposure time are weighted the theoretical optimum exposure time of average acquiring.
For example, for the theoretical optimum exposure time t of current scenebest-i' be,
Wherein, i is the times of acquisition of the theoretical optimum exposure time recorded, tmax, tmidAnd tminRespectively most long exposure
Time, middle gear time for exposure and minimum exposure time；H(gmax) it is most long exposure time image comentropy, H (gmid) it is centre
Time for exposure shelves image information entropy, H (gmin) it is minimum exposure time image information entropy.
Image camera is preset with multiple different time for exposure shelves, will calculate the theoretical optimum exposure time of gained and default exposure
Each gear correspondence time compares in light time bay, pre- with theoretical immediate one grade of optimum exposure time so as to match
If the time for exposure, and then the time for exposure matched is chosen as current optimum exposure time.
S13：Judge whether the times of acquisition are less than or equal to predetermined threshold value, if so, then performing step S14, otherwise perform
Step S16.
The predetermined threshold value can be 2 times or more than 2 times number of times, it is contemplated that the problem of On board computer resource, be preferably
Iteration 2 times, the current optimum exposure time of acquisition can both cause the image content information obtained to enrich, and will not increase on star
The computational burden of computer.When iterations is more than 2 times, then stop iteration.
S14：Calculate the comentropy of the correspondence image according to acquired in current optimum exposure time.
The calculation of the comentropy of correspondence image acquired in current optimum exposure time and calculating side described in step S11
Formula is identical, and here is omitted.
S15：When updating most long time for exposure, middle gear time for exposure and most short exposure according to current optimum exposure time
Between, and corresponding comentropy is updated, and return to execution step S12.
Update mode is：Judge whether current optimum exposure time is more than the middle gear time for exposure, will be most short if being more than
Time for exposure is updated to middle gear time for exposure corresponding time and correspondence fresh information entropy, and the middle gear time for exposure is updated to
Current optimum exposure time corresponding time and correspondence fresh information entropy, otherwise, will be updated to middle gear exposure the most long time for exposure
Corresponding time and correspondence fresh information entropy, are updated to current optimum exposure time corresponding by the middle gear time for exposure between light time
Time and correspondence fresh information entropy.
With reference to Fig. 2, the embodiment of Space-based Space Imagewise exposure time self-adaptation control method one of the present invention
Flow chart.According to theoretical optimum exposure time tbest-i' choose current optimum exposure time tbest-iAfterwards, and then according to current optimal
Time for exposure tbest-iChoose new optimum exposure time section tmax-i, tmid-iAnd tmin-i, obtain corresponding image information entropy H
(gmax-i), H (gmid-i) and H (gmin-i), weighted average is done again, obtains optimum exposure time t next timebest-(i+1).Specifically
Update mode is：If tbest-i>tmid-i-1, then tmax-i=tmax-i-1, tmid-i=tbest-iAnd tmin-i=tmid-i-1, define corresponding
Image information entropy H (gmax-i)=H (gmax-i-1), H (gmid-i)=H (gbest-i), H (gmin-i)=H (gmid-i-1), namely renewal pair
The image information entropy answered；If tbest-i≤tmid-i-1, then tmax-i=tmid-i-1, tmid-i=tbest-iAnd tmin-i=tmin-i-1, definition
Corresponding image information entropy H (gmax-i)=H (gmid-i-1), H (gmid-i)=H (gbest-i), H (gmin-i)=H (gmin-i-1), namely
Update corresponding image information entropy.After renewal terminates, return to execution step S12 and weighted average is done according to updated value again, obtain
Optimum exposure time t next timebest-(i+1).By above content subsequent iteration 2 times or more, so as to obtain final optimal exposure
T between light timebest, and shoot and obtain the maximum current scene of information entropy, i.e. gray-level the abundantest picture material.
S16：Control image camera is continued using current optimum exposure time as optimum exposure time to extraterrestrial target
Imaging.
Final optimum exposure time is obtained after subsequent iteration 2 times or more, is controlled to be imaged according to optimum exposure time
Camera is persistently imaged to target, until the imaging end time, obtains the maximum current scene of information entropy, i.e., so as to shoot
Gray-level the abundantest picture material.After target imaging, view data is transmitted to mass storage by image camera, suitable
Grounded receiving station is issued to when the time.Ground application system is handled target image and interpretation, obtains the clear of extraterrestrial target
Clear image, imaging task is completed.
This method to most long time for exposure, minimum exposure time and middle gear time for exposure by obtaining image information entropy
Calculating, make weighted average with comentropy so as to obtaining current optimum exposure time；Obtain again under current optimum exposure time
Image and calculate its comentropy；Further according to current optimum exposure time update most long time for exposure, minimum exposure time and
The middle gear time for exposure, and obtain corresponding image information entropy and do weighted average again, obtain optimum exposure time next time；
By above content subsequent iteration 2 times or more, so that final optimum exposure time is obtained, and it is maximum to shoot acquisition information entropy
Current scene, i.e. gray-level the abundantest picture material.The Space-based Space Imagewise exposure time of the present invention
Self-adaptation control method is imaged suitable for Space-based Space, make use of the content of image overall, by choosing during rationally exposure
Between, the time for exposure Self Adaptive Control to camera is realized, the image content information of acquisition enriches the most, and algorithm is simple, real-time
Property it is high.
Referring to Fig. 3, Space-based Space Imagewise exposure time adaptive controller configuration diagram of the present invention, bag
Include a comentropy computing unit 31, a current optimum exposure time acquiring unit 32, a judging unit 33, a updating block 34 with
And one imaging control unit 35.
Described information entropy computing unit 31 be used for calculate according to the default most long time for exposure, the middle gear time for exposure and
The comentropy of correspondence image acquired in minimum exposure time, and calculate the correspondence according to acquired in current optimum exposure time
The comentropy of image.The calculation of the comentropy of correspondence image is with reference to described in step S11, and here is omitted.
The current optimum exposure time acquiring unit 32 is connected with described information entropy computing unit 31, for according to all
Described information entropy obtains theoretical optimum exposure time by weighted average mode, and then is existed according to the theoretical optimum exposure time
Choose immediate one grade of time for exposure as current optimum exposure time in default time for exposure shelves, and record it is described it is current most
The times of acquisition of excellent time for exposure.
As optional embodiment, the current optimum exposure time acquiring unit 32 further comprises that summation calculates mould
Block 321, ratio calculation module 322 and acquisition module 323.Wherein, the summation computing module 321 is used to calculate most long exposure
The summation of the comentropy of time, middle gear time for exposure and minimum exposure time correspondence image.The ratio calculation module 322
It is connected with the summation computing module 321, for calculating the comentropy of respective image and the ratio of the summation respectively.It is described to obtain
Modulus block 323 is connected with the summation computing module 321 and ratio calculation module 322 respectively, for according to the summation with
Corresponding ratio, average acquiring is weighted to most long time for exposure, middle gear time for exposure and minimum exposure time theoretical most
The excellent time for exposure.
The judging unit 33 is connected with the current optimum exposure time acquiring unit 32, for judging the acquisition time
Number whether predetermined threshold value, if so, then call the updating block 34, otherwise call the imaging control unit 35.It is described default
Threshold value can be 2 times or more than 2 times number of times, it is contemplated that the problem of On board computer resource, preferably iteration 2 times, and acquisition is worked as
Preceding optimum exposure time can both cause the image content information obtained to enrich, and it is negative to increase the computing of On board computer
Load.When iterations is more than 2 times, then stop iteration.
The updating block 34 respectively with the judging unit 33, the current optimum exposure time acquiring unit 32 and
Described information entropy computing unit 31 is connected, for when the times of acquisition are less than or equal to predetermined threshold value, according to current optimal exposure
Most long time for exposure, middle gear time for exposure and minimum exposure time are updated between light time, and updates corresponding comentropy, and
The current optimum exposure time acquiring unit 32 is called to re-start weighted average after the completion of renewal.
The updating block 34 is further used for judging whether current optimum exposure time is more than the middle gear time for exposure, if
It is more than, then minimum exposure time is updated to middle gear time for exposure corresponding time and correspondence fresh information entropy, by middle gear
Time for exposure is updated to current optimum exposure time corresponding time and correspondence fresh information entropy, otherwise, will the most long time for exposure
Middle gear time for exposure corresponding time and correspondence fresh information entropy are updated to, the middle gear time for exposure is updated to current optimal
Time for exposure corresponding time and correspondence fresh information entropy.
The imaging control unit 35 is connected with the judging unit 33, for being more than predetermined threshold value in the times of acquisition
When, control image camera is persistently imaged using current optimum exposure time as optimum exposure time to extraterrestrial target.When even
Continuous iteration 2 times or more is rear to obtain final optimum exposure time, controls image camera to enter target according to optimum exposure time
The lasting imaging of row, until the imaging end time, the maximum current scene of information entropy, i.e. gray-level are obtained the most so as to shoot
Abundant picture material.After target imaging, view data is transmitted to mass storage by image camera, in due course between be issued to
Grounded receiving station.Ground application system is handled target image and interpretation, obtains the picture rich in detail of extraterrestrial target, and imaging is appointed
Business is completed.
An emulation embodiment given below, with to Space-based Space Imagewise exposure time Self Adaptive Control of the present invention
The implementation result of method is verified.
F-number F is used for 20, sensitivity ISO100 camera carries out ground simulation checking, and bay is set during the camera exposure
Put have 26 grades (0.2500,0.3125,0.4000,0.5000,0.6250,0.7692,1,1.2500,1.5625,2,
2.5000,3.1250,4,5,6.2500,8,10,12.5000,16.6667,20,25,33.3333,40,50,66.6667,
100).That is, according to the setting of the camera, its initial minimum exposure time is 0.25ms, the middle gear time for exposure is 4ms, most
Long time for exposure 100ms.
Ground simulation checking specific implementation step is as follows：
1) it is automatic to obtain 0.25ms pairs of most long time for exposure 100ms, middle gear time for exposure 4ms and minimum exposure time
The image answered；
2) to step 1) obtain three width images calculate information entropy, respectively 4.1261,7.0649,4.3530.
3) according to step 2) three comentropies of gained are calculated, obtaining theoretical optimum exposure time by weighted average calculation is
28.4327ms, it is 25ms that current optimum exposure time shelves are chosen nearby, and records the acquisition time of the current optimum exposure time
Number is 1 time；
4) judge iterations not less than 2 times；
5) current optimum exposure time 25ms image is obtained, its comentropy is calculated and obtains 4.9776；
6) because current optimum exposure time 25ms is more than middle gear time for exposure 4ms, therefore redefine current most long
Time for exposure 25ms, middle gear time for exposure 4ms and minimum exposure time 0.25ms, corresponding image information entropy is respectively
4.9776,7.0649,4.3530；
7) according to step 6) in three comentropies, obtaining theoretical optimum exposure time by weighted average calculation is
9.3799ms, it is 10ms that current optimum exposure time shelves are chosen nearby, and records the acquisition time of the current optimum exposure time
Number is 2 times；
8) judge iterations not less than 2 times；
9) current optimum exposure time 10ms image is obtained, its comentropy is calculated and obtains 6.8445；
10) because current optimum exposure time 10ms is more than middle gear time for exposure 4ms, therefore redefine current most long
Time for exposure 10ms, middle gear time for exposure 4ms and minimum exposure time 0.25ms, corresponding image information entropy is respectively
6.8445,7.0649,4.3530；
11) according to step 10) in three comentropies, obtaining theoretical optimum exposure time by weighted average calculation is
5.3549ms, it is 5ms that current optimum exposure time shelves are chosen nearby, and records the times of acquisition of the current optimum exposure time
For 3 times；
12) judge iterations more than 2 times；
13) using optimum exposure time shelves 5ms (present image comentropy is 7.2577), target is persistently imaged, directly
To being preset to as the end time.
Fig. 4 be the corresponding image information changes of entropy of above-described embodiment curve, its be under the conditions of identical camera parameter,
Same photographed scene different exposure time obtains the change curve of the information entropy of image.As seen from Figure 4, the present invention is passed through
The image content information acquired in the 5ms time for exposure that the self-adaptation control method is obtained enriches the most, demonstrates the present invention
The validity of the time for exposure self-adaptation control method of offer.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (6)
1. a kind of Space-based Space Imagewise exposure time self-adaptation control method, it is characterised in that including,
(1) correspondence according to acquired in default most long time for exposure, middle gear time for exposure and minimum exposure time is calculated
The comentropy of image；
(2) theoretical optimum exposure time is obtained by weighted average mode according to all described information entropys, and then according to the reason
Immediate one grade of time for exposure is chosen as current optimum exposure time in shelves of default time for exposure by optimum exposure time,
And record the times of acquisition of the current optimum exposure time；
(3) judge whether the times of acquisition are less than or equal to predetermined threshold value, if so, then performing step (4), otherwise perform step
(6)；
(4) comentropy of the correspondence image according to acquired in current optimum exposure time is calculated；
(5) most long time for exposure, middle gear time for exposure and minimum exposure time are updated according to current optimum exposure time, with
And corresponding comentropy is updated, and return to execution step (2)；
(6) control image camera is persistently imaged using current optimum exposure time as optimum exposure time to extraterrestrial target；
Wherein, theoretical optimum exposure time is obtained by weighted average mode according to all described information entropys in step (2) and enters one
Step includes：
(21) comentropy of calculating most long time for exposure, middle gear time for exposure and minimum exposure time correspondence image is total
With；
(22) ratio of the comentropy with the summation of respective image is calculated respectively；
(23) according to the summation and corresponding ratio, to most long time for exposure, middle gear time for exposure and minimum exposure time
It is weighted the theoretical optimum exposure time of average acquiring.
2. Space-based Space Imagewise exposure time self-adaptation control method according to claim 1, it is characterised in that step
Suddenly predetermined threshold value described in (3) is 2 times.
3. Space-based Space Imagewise exposure time self-adaptation control method according to claim 1, it is characterised in that step
Suddenly (5) further comprise：Judge whether current optimum exposure time is more than the middle gear time for exposure, if being more than, most short will expose
Middle gear time for exposure corresponding time and correspondence fresh information entropy are updated between light time, the middle gear time for exposure is updated to work as
Preceding optimum exposure time corresponding time and corresponding fresh information entropy, otherwise, will be updated to middle gear exposure the most long time for exposure
Time corresponding time simultaneously correspondence fresh information entropy, by the middle gear time for exposure be updated to current optimum exposure time it is corresponding when
Between and correspondence fresh information entropy.
4. a kind of Space-based Space Imagewise exposure time adaptive controller, it is characterised in that calculated including a comentropy
Unit, a current optimum exposure time acquiring unit, a judging unit, a updating block and an imaging control unit,
Described information entropy computing unit is used to calculate according to default most long time for exposure, middle gear time for exposure and most short exposure
The comentropy of acquired correspondence image between light time, and correspondence image of the calculating according to acquired in current optimum exposure time
Comentropy；
The current optimum exposure time acquiring unit is connected with described information entropy computing unit, for according to all described informations
Entropy obtains theoretical optimum exposure time by weighted average mode, and then according to the theoretical optimum exposure time in default exposure
When bay in choose immediate one grade of time for exposure as current optimum exposure time, and when recording the current optimal exposure
Between times of acquisition；
The judging unit is connected with the current optimum exposure time acquiring unit, for judging whether the times of acquisition are small
In or equal to predetermined threshold value, if so, then calling the updating block, the imaging control unit is otherwise called；
The updating block respectively with the judging unit, the current optimum exposure time acquiring unit and described information entropy
Computing unit is connected, for when the times of acquisition are less than or equal to predetermined threshold value, being updated according to current optimum exposure time
Most long time for exposure, middle gear time for exposure and minimum exposure time, and corresponding comentropy is updated, and completed updating
After call the current optimum exposure time acquiring unit；
The imaging control unit is connected with the judging unit, for when the times of acquisition are more than predetermined threshold value, controlling
Image camera is persistently imaged using current optimum exposure time as optimum exposure time to extraterrestrial target；
Wherein, the current optimum exposure time acquiring unit further comprise summation computing module, ratio calculation module and
Acquisition module；
The summation computing module is used to calculate most long time for exposure, middle gear time for exposure and minimum exposure time corresponding diagram
The summation of the comentropy of picture；
The ratio calculation module is connected with the summation computing module, for calculate respectively the comentropy of respective image with it is described
The ratio of summation；
The acquisition module is connected with the summation computing module and ratio calculation module respectively, for according to the summation with
Corresponding ratio, average acquiring is weighted to most long time for exposure, middle gear time for exposure and minimum exposure time theoretical most
The excellent time for exposure.
5. Space-based Space Imagewise exposure time adaptive controller according to claim 4, it is characterised in that institute
Predetermined threshold value is stated for 2 times.
6. Space-based Space Imagewise exposure time adaptive controller according to claim 4, it is characterised in that institute
Updating block is stated to be further used for judging whether current optimum exposure time is more than the middle gear time for exposure, will most if being more than
Short exposure time is updated to middle gear time for exposure corresponding time and correspondence fresh information entropy, and the middle gear time for exposure is updated
For current optimum exposure time corresponding time and correspondence fresh information entropy, otherwise, the most long time for exposure middle gear will be updated to
Time for exposure corresponding time and correspondence fresh information entropy, current optimum exposure time correspondence is updated to by the middle gear time for exposure
Time and correspondence fresh information entropy.
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| CN109862269B (en) * | 2019-02-18 | 2020-07-31 | Oppo广东移动通信有限公司 | Image acquisition method and device, electronic equipment and computer readable storage medium |
| CN110913150B (en) * | 2019-11-18 | 2021-04-02 | 西北工业大学 | Self-adaptive exposure imaging method based on space platform |
| CN111474177A (en) * | 2020-05-06 | 2020-07-31 | 深圳市斑马视觉科技有限公司 | Liquid crystal screen backlight foreign matter defect detection method based on computer vision |
| CN113079323B (en) * | 2021-03-31 | 2022-02-11 | 中国科学院长春光学精密机械与物理研究所 | Space remote sensing load automatic exposure method based on two-dimensional entropy |
| CN114389674B (en) * | 2021-11-30 | 2022-12-09 | 中国科学院西安光学精密机械研究所 | Rapid automatic exposure method and system for space micro-nano large-field-of-view camera and storage medium |
| CN115442534B (en) * | 2022-08-04 | 2023-07-14 | 上海卫星工程研究所 | Space target space-based imaging automatic multilevel exposure control method and system |
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