CN104301622A - Self-adaption space-based space target imaging exposure time control method and device - Google Patents
Self-adaption space-based space target imaging exposure time control method and device Download PDFInfo
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Abstract
The invention provides a self-adaption space-based space target imaging exposure time control method and device. The method includes the steps of firstly, calculating the information entropy of corresponding images obtained according to the preset longest exposure time, the preset medium exposure time and the preset shortest exposure time; obtaining the theoretical optimal exposure time through a weighed average method according to all types of the information entropy, selecting one exposure time which is closest to the theoretical optimal exposure time from preset exposure time to serve as the current optimal exposure time, and recording the number of obtaining times of the current optimal exposure time; thirdly, judging whether the number of the obtaining times is smaller than or equal to a preset threshold value or not, executing the fourth step if the number of the obtaining times is smaller than or equal to the preset threshold value, and executing the sixth step if the number of the obtaining times is not smaller than or equal to the preset threshold value; fourthly, calculating the information entropy of the corresponding image which is obtained according to the current optimal exposure time; fifthly, renewing the longest exposure time, the medium exposure time, the shortest exposure time and the corresponding information entropy according to the current optimal exposure time, and executing the second step; sixthly, controlling an imaging camera to conduct unceasing imaging on a space target with the current optimal exposure time as the optimal exposure time.
Description
Technical field
The present invention relates to Space-based Space imaging field, particularly relate to and a kind ofly to realize the Space-based Space Imagewise exposure time self-adaptation control method of the time for exposure adaptive control of camera and device based on comentropy.
Background technology
Under the constraint of space-based image-forming condition, the degree of enriching of gradation of image level depends on the dynamic range of sensor design itself.If the dynamic range of sensor design is set, so choose reasonable time for exposure, give full play to the performance of transducer itself, picture material can be made the abundantest.
At present, the time for exposure autocontrol method that business camera is conventional has central average metering, Partial metering and some Exposure Metering.The most frequently used is central average metering, and when namely utilizing conventional shooting, the shooting body multidigit is in field of view center, thus the gray value weighted average of getting picture centre region is as the parameters input choosing the time for exposure.This method, if shot object is not positioned at field of view center or takes under backlighting condition, just inapplicable.Partial metering carries out light-metering to a certain local of image, and processing mode is similar to central average metering, and the region only chosen is different.Point Exposure Metering is then adopt visual field central authorities one very low range region as Expose f iotaducials point, thus carries out the Lookup protocol of current exposure time.But, in space-based imaging field, whether be positioned at field of view center at uncertain subject, and subject only may appear at the uncertain a certain local location of image planes state under, above-mentioned conventional time for exposure autocontrol method is also inapplicable.
In addition, current also have following several mode what grind: a kind of is storage 12 groups correction parameter, utilizes the feedback quantity of LMS filtering and scene constantly to realize the self-adaptative adjustment of the time of integration; But this method needs the time of integration repeatedly, and adjustment just can reach suitable state, is unfavorable for real-time process.The second is obtained the correction parameter under each time of integration by blackbody demarcation experiment and stored, in the process corrected, select suitable correction parameter to realize the switching of the time of integration according to the threshold value of setting; This method needs to shift to an earlier date setting threshold according to calibration experiment result.The third is for adopting corrected neural network algorithm, set rational threshold value and divide the time of integration, and the background image stored under the different time of integration, the original output of detector is deducted the input of the background image under the associated quad time as neural net, thus the self adaptation realizing the time of integration switches; These algorithm relative complex, real-time is not good.
Summary of the invention
The object of the invention is to, the time for exposure that the time for exposure autocontrol method commonly used for existing business camera is not suitable for Space-based Space imaging controls, and in the not good problem of the time for exposure autocontrol method algorithm relative complex real-time of grinding, a kind of Space-based Space Imagewise exposure time self-adaptation control method and device are provided, utilize the content of image overall, chosen the time for exposure adaptive control realized camera by the reasonable time for exposure, thus the picture material of acquisition can be made the abundantest.
For achieving the above object, the invention provides a kind of Space-based Space Imagewise exposure time self-adaptation control method, comprise, (1) calculates the comentropy of the correspondence image obtained according to the longest time for exposure of presetting, middle gear time for exposure and minimum exposure time; (2) the theoretical optimum time for exposure is obtained according to all described comentropies by weighted average mode, and then in default time for exposure shelves, choose immediate one grade of time for exposure as the current optimum time for exposure according to the described theoretical optimum time for exposure, and record the acquisition number of times of described current optimum time for exposure; (3) judge whether described acquisition number of times is less than or equal to predetermined threshold value, if so, then perform step (4), otherwise perform step (6); (4) comentropy of the correspondence image obtained according to the current optimum time for exposure is calculated; (5) upgrade the longest time for exposure, middle gear time for exposure and minimum exposure time according to the current optimum time for exposure, and upgrade corresponding comentropy, and return execution step (2); (6) control image camera and as the optimum time for exposure, lasting imaging is carried out to extraterrestrial target using the current optimum time for exposure.
For achieving the above object, present invention also offers a kind of Space-based Space Imagewise exposure time adaptive controller, comprise a comentropy computing unit, current optimum time for exposure acquiring unit, a judging unit, a updating block and an imaging control unit; Described comentropy computing unit for calculating the comentropy of the correspondence image obtained according to the longest time for exposure of presetting, middle gear time for exposure and minimum exposure time, and calculates the comentropy of the correspondence image obtained according to the current optimum time for exposure; Described current optimum time for exposure acquiring unit is connected with described comentropy computing unit, for obtaining the theoretical optimum time for exposure according to all described comentropies by weighted average mode, and then in default time for exposure shelves, choose immediate one grade of time for exposure as the current optimum time for exposure according to the described theoretical optimum time for exposure, and record the acquisition number of times of described current optimum time for exposure; Described judging unit is connected with described current optimum time for exposure acquiring unit, for judging described acquisition number of times whether predetermined threshold value, if so, then calling described updating block, otherwise calling described imaging control unit; Described updating block is connected with described judging unit, described current optimum time for exposure acquiring unit and described comentropy computing unit respectively, for when described acquisition number of times is less than or equal to predetermined threshold value, the longest time for exposure, middle gear time for exposure and minimum exposure time is upgraded according to the current optimum time for exposure, and upgrade corresponding comentropy, and after renewal completes, call described current optimum time for exposure acquiring unit; Described imaging control unit is connected with described judging unit, for when described acquisition number of times is greater than predetermined threshold value, controls image camera and carries out lasting imaging as the optimum time for exposure to extraterrestrial target using the current optimum time for exposure.
The invention has the advantages that: be applicable to Space-based Space imaging, make use of the content of image overall, by choosing the reasonable time for exposure, realizing the time for exposure adaptive control to camera, the image content information obtained is the abundantest, and algorithm is simple, real-time is high.
Accompanying drawing explanation
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 chart of Space-based Space Imagewise exposure time self-adaptation control method one embodiment of the present invention;
Fig. 3, the configuration diagram of Space-based Space Imagewise exposure time adaptive controller of the present invention;
Fig. 4, the curve of the image information entropy change that one embodiment of the invention is corresponding.
Embodiment
According to Shannon information theory, when entropy is maximum, amount of information is maximum, and therefore, the value of the image information entropy that Space-based Space imaging obtains is larger, and also just mean that picture material is abundanter, gray-level is more.The present invention utilizes the content of image overall, chooses the reasonable time for exposure based on image information entropy by iteration, realizes the time for exposure adaptive control to camera, and the image content information that Space-based Space imaging is obtained is the abundantest.Below in conjunction with accompanying drawing, Space-based Space Imagewise exposure time self-adaptation control method provided by the invention and device are elaborated.
With reference to figure 1, the schematic flow sheet of Space-based Space Imagewise exposure time self-adaptation control method of the present invention.The method of the invention comprises the steps.S11: the comentropy calculating the correspondence image obtained according to the longest time for exposure of presetting, middle gear time for exposure and minimum exposure time; S12: obtain the theoretical optimum time for exposure by weighted average mode according to all described comentropies, and then in default time for exposure shelves, choose immediate one grade of time for exposure as the current optimum time for exposure according to the described theoretical optimum time for exposure, and record the acquisition number of times of described current optimum time for exposure; S13: judge whether described acquisition number of times is less than or equal to predetermined threshold value, if so, then performs step S14, otherwise performs step S16; S14: the comentropy calculating the correspondence image obtained according to the current optimum time for exposure; S15: upgrade the longest time for exposure, middle gear time for exposure and minimum exposure time according to the current optimum time for exposure, and upgrade corresponding comentropy, and return execution step S12; S16: control image camera and as the optimum time for exposure, lasting imaging is carried out to extraterrestrial target using the current optimum time for exposure.Below the method for the invention is described in detail.
S11: the comentropy calculating the correspondence image obtained according to the longest time for exposure of presetting, middle gear time for exposure and minimum exposure time.
By ground control centre according to the track of present satellites and catalogue data library information determination target satellite position, attitude of satellite guidance law, camera imaging beginning and ending time and other relevant operating parameter.When satellite enters TT & c arc, by satellite-ground link notes parameter.Enter task segmental arc, satellite Star Service is dispatched according to flow of task, and image camera is started working, and automatically obtains corresponding image according to the longest time for exposure of presetting, middle gear time for exposure and minimum exposure time.Can calculate obtained correspondence image afterwards, obtain corresponding informance entropy, comentropy illustrates the average information of video source.
Such as, Space-based Space image g is calculated, obtains corresponding comentropy H (g):
Wherein N is total tonal gradation of image, P
kfor the probability distribution of certain gray scale of image, the ratio that namely pixel of this tonal gradation is shared in entire image.
S12: obtain the theoretical optimum time for exposure by weighted average mode according to all described comentropies, and then in default time for exposure shelves, choose immediate one grade of time for exposure as the current optimum time for exposure according to the described theoretical optimum time for exposure, and record the acquisition number of times of described current optimum time for exposure.
Obtain the theoretical optimum time for exposure according to all described comentropies by weighted average mode to comprise further: the summation of comentropy 1) calculating the longest time for exposure, middle gear time for exposure and minimum exposure time correspondence image; 2) comentropy of respective image and the ratio of described summation is calculated respectively; 23) according to described summation and corresponding ratio, be weighted to the longest time for exposure, middle gear time for exposure and minimum exposure time the average acquiring theoretical optimum time for exposure.
Such as, for the theoretical optimum time for exposure t of current scene
best-i' be,
Wherein, i is the acquisition number of times of recorded theory optimum time for exposure, t
max, t
midand t
minbe respectively the longest time for exposure, middle gear time for exposure and minimum exposure time; H (g
max) be the longest exposure time image comentropy, H (g
mid) be intermediate exposure period shelves image information entropy, H (g
min) be minimum exposure time image information entropy.
Image camera is preset with multiple different time for exposure shelves, by theoretical for the calculating gained optimum time for exposure compared with each gear corresponding time in default time for exposure shelves, thus can match and theory optimum time for exposure immediate one grade of default time for exposure, and then choose time for exposure of matching as the current optimum time for exposure.
S13: judge whether described acquisition number of times is less than or equal to predetermined threshold value, if so, then performs step S14, otherwise performs step S16.
Described predetermined threshold value can be more than 2 times or 2 times number of times, consider the problem of On board computer resource, be preferably iteration 2 times, the current optimum time for exposure of acquisition both can make the image content information obtained enrich, and can not increase the computational burden of On board computer.When iterations is more than 2 times, then stop iteration.
S14: the comentropy calculating the correspondence image obtained according to the current optimum time for exposure.
The account form of the comentropy of the correspondence image that the current optimum time for exposure obtains is identical with account form described in step S11, repeats no more herein.
S15: upgrade the longest time for exposure, middle gear time for exposure and minimum exposure time according to the current optimum time for exposure, and upgrade corresponding comentropy, and return execution step S12.
Update mode is: judge whether the current optimum time for exposure is greater than the middle gear time for exposure, if be greater than, then minimum exposure time is updated to time corresponding to middle gear time for exposure and corresponding lastest imformation entropy, is updated to time corresponding to current optimum time for exposure the middle gear time for exposure and corresponding lastest imformation entropy, otherwise, is updated to time corresponding to middle gear time for exposure the longest time for exposure and corresponding lastest imformation entropy, is updated to time corresponding to current optimum time for exposure the middle gear time for exposure and corresponding lastest imformation entropy.
With reference to figure 2, the flow chart of Space-based Space Imagewise exposure time self-adaptation control method one embodiment of the present invention.According to theoretical optimum time for exposure t
best-i' choose current optimum time for exposure t
best-iafter, and then according to current optimum time for exposure t
best-ichoose new optimum exposure period t
max-i, t
mid-iand t
min-i, obtain corresponding image information entropy H (g
max-i), H (g
mid-i) and H (g
min-i), again do weighted average, obtain optimum time for exposure t next time
best-(i+1).Concrete update mode is: if t
best-i>t
mid-i-1, then t
max-i=t
max-i-1, t
mid-i=t
best-iand t
min-i=t
mid-i-1, the image information entropy H (g that definition is corresponding
max-i)=H (g
max-i-1), H (g
mid-i)=H (g
best-i), H (g
min-i)=H (g
mid-i-1), also namely upgrade corresponding image information entropy; If t
best-i≤ t
mid-i-1, then t
max-i=t
mid-i-1, t
mid-i=t
best-iand t
min-i=t
min-i-1, the image information entropy H (g that definition is corresponding
max-i)=H (g
mid-i-1), H (g
mid-i)=H (g
best-i), H (g
min-i)=H (g
min-i-1), also namely upgrade corresponding image information entropy.After renewal terminates, return execution step S12 and again do weighted average according to updated value, obtain optimum time for exposure t next time
best-(i+1).By above content subsequent iteration 2 times or more, thus obtain final optimum time for exposure t
best, and take the maximum current scene of acquisition information entropy, i.e. the picture material enriched the most of gray-level.
S16: control image camera and as the optimum time for exposure, lasting imaging is carried out to extraterrestrial target using the current optimum time for exposure.
When obtaining the final optimum time for exposure after subsequent iteration 2 times or more, control image camera according to the optimum time for exposure and lasting imaging is carried out to target, until the imaging end time, thus the current scene that shooting acquisition information entropy is maximum, i.e. the picture material enriched the most of gray-level.After target imaging, view data is passed to mass storage by image camera, is issued to grounded receiving station in due course.Ground application system processes and interpretation target image, and obtain the picture rich in detail of extraterrestrial target, imaging task completes.
This method, by obtaining the calculating of image information entropy to the longest time for exposure, minimum exposure time and middle gear time for exposure, is made weighted average with comentropy thus obtains the current optimum time for exposure; Obtain the image under the current optimum time for exposure again and calculate its comentropy; Upgrade the longest time for exposure, minimum exposure time and middle gear time for exposure according to the current optimum time for exposure again, and obtain corresponding image information entropy and again do weighted average, obtain the optimum time for exposure next time; By above content subsequent iteration 2 times or more, thus obtain the final optimum time for exposure, and take the maximum current scene of acquisition information entropy, be i.e. the picture material enriched the most of gray-level.Space-based Space Imagewise exposure time self-adaptation control method of the present invention is applicable to Space-based Space imaging, make use of the content of image overall, by choosing the reasonable time for exposure, realize the time for exposure adaptive control to camera, the image content information obtained is the abundantest, and algorithm is simple, real-time is high.
See Fig. 3, Space-based Space Imagewise exposure time adaptive controller configuration diagram of the present invention, comprises comentropy computing unit 31, current optimum time for exposure acquiring unit 32, judging unit 33, updating block 34 and an imaging control unit 35.
Described comentropy computing unit 31 for calculating the comentropy of the correspondence image obtained according to the longest time for exposure of presetting, middle gear time for exposure and minimum exposure time, and calculates the comentropy of the correspondence image obtained according to the current optimum time for exposure.The account form of the comentropy of correspondence image, with reference to described in step S11, repeats no more herein.
Described current optimum time for exposure acquiring unit 32 is connected with described comentropy computing unit 31, for obtaining the theoretical optimum time for exposure according to all described comentropies by weighted average mode, and then in default time for exposure shelves, choose immediate one grade of time for exposure as the current optimum time for exposure according to the described theoretical optimum time for exposure, and record the acquisition number of times of described current optimum time for exposure.
As optional execution mode, described current optimum time for exposure acquiring unit 32 comprises summation computing module 321, ratio calculation module 322 and acquisition module 323 further.Wherein, described summation computing module 321 is for calculating the summation of comentropy of the longest time for exposure, middle gear time for exposure and minimum exposure time correspondence image.Described ratio calculation module 322 is connected with described summation computing module 321, for the ratio of the comentropy and described summation that calculate respective image respectively.Described acquisition module 323 is connected with described summation computing module 321 and ratio calculation module 322 respectively, for according to described summation and corresponding ratio, be weighted to the longest time for exposure, middle gear time for exposure and minimum exposure time the average acquiring theoretical optimum time for exposure.
Described judging unit 33 is connected with described current optimum time for exposure acquiring unit 32, for judging described acquisition number of times whether predetermined threshold value, if so, then calling described updating block 34, otherwise calling described imaging control unit 35.Described predetermined threshold value can be more than 2 times or 2 times number of times, consider the problem of On board computer resource, be preferably iteration 2 times, the current optimum time for exposure of acquisition both can make the image content information obtained enrich, and can not increase the computational burden of On board computer.When iterations is more than 2 times, then stop iteration.
Described updating block 34 is connected with described judging unit 33, described current optimum time for exposure acquiring unit 32 and described comentropy computing unit 31 respectively, for when described acquisition number of times is less than or equal to predetermined threshold value, the longest time for exposure, middle gear time for exposure and minimum exposure time is upgraded according to the current optimum time for exposure, and upgrade corresponding comentropy, and after renewal completes, call described current optimum time for exposure acquiring unit 32 re-start weighted average.
Described updating block 34 is further used for judging whether the current optimum time for exposure is greater than the middle gear time for exposure, if be greater than, then minimum exposure time is updated to time corresponding to middle gear time for exposure and corresponding lastest imformation entropy, is updated to time corresponding to current optimum time for exposure the middle gear time for exposure and corresponding lastest imformation entropy, otherwise, is updated to time corresponding to middle gear time for exposure the longest time for exposure and corresponding lastest imformation entropy, is updated to time corresponding to current optimum time for exposure the middle gear time for exposure and corresponding lastest imformation entropy.
Described imaging control unit 35 is connected with described judging unit 33, for when described acquisition number of times is greater than predetermined threshold value, controls image camera and carries out lasting imaging as the optimum time for exposure to extraterrestrial target using the current optimum time for exposure.When obtaining the final optimum time for exposure after subsequent iteration 2 times or more, control image camera according to the optimum time for exposure and lasting imaging is carried out to target, until the imaging end time, thus the current scene that shooting acquisition information entropy is maximum, i.e. the picture material enriched the most of gray-level.After target imaging, view data is passed to mass storage by image camera, is issued to grounded receiving station in due course.Ground application system processes and interpretation target image, and obtain the picture rich in detail of extraterrestrial target, imaging task completes.
Below provide an emulation embodiment, to verify the implementation result of Space-based Space Imagewise exposure time self-adaptation control method of the present invention.
Adopt F-number F be 20, photosensitivity ISO100 camera carry out ground simulation checking, during this camera exposure, bay arranges and has 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).Also namely, according to the setting of this camera, its initial minimum exposure time is 0.25ms, and the middle gear time for exposure is 4ms, the longest time for exposure 100ms.
Ground simulation verifies that concrete implementation step is as follows:
1) automatic acquisition the longest time for exposure 100ms, image that middle gear time for exposure 4ms and minimum exposure time 0.25ms is corresponding;
2) to step 1) the three width image computing information entropy that obtain, be respectively 4.1261,7.0649,4.3530.
3) according to step 2) calculate gained three comentropies, obtaining the theoretical optimum time for exposure by weighted average calculation is 28.4327ms, choosing current optimum time for exposure shelves is nearby 25ms, and the acquisition number of times recording the described current optimum time for exposure is 1 time;
4) judge that iterations is not more than 2 times;
5) obtain the image of current optimum time for exposure 25ms, calculate its comentropy and obtain 4.9776;
6) because current optimum time for exposure 25ms is greater than middle gear time for exposure 4ms, therefore redefine the longest current 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 the theoretical optimum time for exposure by weighted average calculation is 9.3799ms, and choosing current optimum time for exposure shelves is nearby 10ms, and the acquisition number of times recording the described current optimum time for exposure is 2 times;
8) judge that iterations is not more than 2 times;
9) obtain the image of current optimum time for exposure 10ms, calculate its comentropy and obtain 6.8445;
10) because current optimum time for exposure 10ms is greater than middle gear time for exposure 4ms, therefore redefine the longest current 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 the theoretical optimum time for exposure by weighted average calculation is 5.3549ms, and choosing current optimum time for exposure shelves is nearby 5ms, and the acquisition number of times recording the described current optimum time for exposure is 3 times;
12) iterations is judged more than 2 times;
13) with optimum time for exposure shelves 5ms (present image comentropy is for 7.2577), lasting imaging is carried out to target, until be preset to the picture end time.
Fig. 4 is the curve of the image information entropy change that above-described embodiment is corresponding, and it is under identical camera parameter condition, and same photographed scene different exposure time obtains the change curve of the information entropy of image.As seen from Figure 4, the image content information that the 5ms time for exposure obtained by self-adaptation control method of the present invention is obtained is the abundantest, demonstrates the validity of time for exposure self-adaptation control method provided by the invention.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, 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 considered as protection scope of the present invention.
Claims (8)
1. a Space-based Space Imagewise exposure time self-adaptation control method, is characterized in that, comprise,
(1) comentropy of the correspondence image obtained according to the longest time for exposure of presetting, middle gear time for exposure and minimum exposure time is calculated;
(2) the theoretical optimum time for exposure is obtained according to all described comentropies by weighted average mode, and then in default time for exposure shelves, choose immediate one grade of time for exposure as the current optimum time for exposure according to the described theoretical optimum time for exposure, and record the acquisition number of times of described current optimum time for exposure;
(3) judge whether described acquisition number of times is less than or equal to predetermined threshold value, if so, then perform step (4), otherwise perform step (6);
(4) comentropy of the correspondence image obtained according to the current optimum time for exposure is calculated;
(5) upgrade the longest time for exposure, middle gear time for exposure and minimum exposure time according to the current optimum time for exposure, and upgrade corresponding comentropy, and return execution step (2);
(6) control image camera and as the optimum time for exposure, lasting imaging is carried out to extraterrestrial target using the current optimum time for exposure.
2. Space-based Space Imagewise exposure time self-adaptation control method according to claim 1, is characterized in that, step
(2) obtain the theoretical optimum time for exposure according to all described comentropies by weighted average mode in comprise further:
(21) summation of comentropy of the longest time for exposure, middle gear time for exposure and minimum exposure time correspondence image is calculated;
(22) comentropy of respective image and the ratio of described summation is calculated respectively;
(23) according to described summation and corresponding ratio, be weighted to the longest time for exposure, middle gear time for exposure and minimum exposure time the average acquiring theoretical optimum time for exposure.
3. Space-based Space Imagewise exposure time self-adaptation control method according to claim 1, is characterized in that, described in step (3), predetermined threshold value is 2 times.
4. Space-based Space Imagewise exposure time self-adaptation control method according to claim 1, it is characterized in that, step (5) comprises further: judge whether the current optimum time for exposure is greater than the middle gear time for exposure, if be greater than, then minimum exposure time is updated to time corresponding to middle gear time for exposure and corresponding lastest imformation entropy, is updated to time corresponding to current optimum time for exposure the middle gear time for exposure and corresponding lastest imformation entropy, otherwise, is updated to time corresponding to middle gear time for exposure the longest time for exposure and corresponding lastest imformation entropy, is updated to time corresponding to current optimum time for exposure the middle gear time for exposure and corresponding lastest imformation entropy.
5. a Space-based Space Imagewise exposure time adaptive controller, is characterized in that, comprises a comentropy computing unit, current optimum time for exposure acquiring unit, a judging unit, a updating block and an imaging control unit,
Described comentropy computing unit for calculating the comentropy of the correspondence image obtained according to the longest time for exposure of presetting, middle gear time for exposure and minimum exposure time, and calculates the comentropy of the correspondence image obtained according to the current optimum time for exposure;
Described current optimum time for exposure acquiring unit is connected with described comentropy computing unit, for obtaining the theoretical optimum time for exposure according to all described comentropies by weighted average mode, and then in default time for exposure shelves, choose immediate one grade of time for exposure as the current optimum time for exposure according to the described theoretical optimum time for exposure, and record the acquisition number of times of described current optimum time for exposure;
Described judging unit is connected with described current optimum time for exposure acquiring unit, for judging described acquisition number of times whether predetermined threshold value, if so, then calling described updating block, otherwise calling described imaging control unit;
Described updating block is connected with described judging unit, described current optimum time for exposure acquiring unit and described comentropy computing unit respectively, for when described acquisition number of times is less than or equal to predetermined threshold value, the longest time for exposure, middle gear time for exposure and minimum exposure time is upgraded according to the current optimum time for exposure, and upgrade corresponding comentropy, and after renewal completes, call described current optimum time for exposure acquiring unit;
Described imaging control unit is connected with described judging unit, for when described acquisition number of times is greater than predetermined threshold value, controls image camera and carries out lasting imaging as the optimum time for exposure to extraterrestrial target using the current optimum time for exposure.
6. Space-based Space Imagewise exposure time adaptive controller according to claim 5, is characterized in that, described current optimum time for exposure acquiring unit comprises summation computing module, ratio calculation module and acquisition module further;
Described summation computing module is for calculating the summation of comentropy of the longest time for exposure, middle gear time for exposure and minimum exposure time correspondence image;
Described ratio calculation module is connected with described summation computing module, for the ratio of the comentropy and described summation that calculate respective image respectively;
Described acquisition module is connected with described summation computing module and ratio calculation module respectively, for according to described summation and corresponding ratio, be weighted to the longest time for exposure, middle gear time for exposure and minimum exposure time the average acquiring theoretical optimum time for exposure.
7. Space-based Space Imagewise exposure time adaptive controller according to claim 5, is characterized in that, described predetermined threshold value is 2 times.
8. Space-based Space Imagewise exposure time adaptive controller according to claim 5, it is characterized in that, described updating block is further used for judging whether the current optimum time for exposure is greater than the middle gear time for exposure, if be greater than, then minimum exposure time is updated to time corresponding to middle gear time for exposure and corresponding lastest imformation entropy, is updated to time corresponding to current optimum time for exposure the middle gear time for exposure and corresponding lastest imformation entropy, otherwise, is updated to time corresponding to middle gear time for exposure the longest time for exposure and corresponding lastest imformation entropy, is updated to time corresponding to current optimum time for exposure the middle gear time for exposure and corresponding lastest imformation entropy.
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| CN109862269A (en) * | 2019-02-18 | 2019-06-07 | Oppo广东移动通信有限公司 | Image-pickup method, device, electronic equipment and computer readable storage medium |
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| CN110913150B (en) * | 2019-11-18 | 2021-04-02 | 西北工业大学 | Self-adaptive exposure imaging method based on space platform |
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| 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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