CN104301670A - Lunar-based optical telescope scientific data processing and quick look method - Google Patents
Lunar-based optical telescope scientific data processing and quick look method Download PDFInfo
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Abstract
The invention discloses a lunar-based optical telescope scientific data processing and quick look method. The method includes the first step of carrying out bit synchronization, frame synchronization, descrambling and decoding on received data to obtain an effective load data source pocket, the second step of unpacking the effective load data source pocket, removing the pocket header of the source pocket, and extracting scientific data blocks of various effective loads, the third step of splicing the scientific data blocks of a lunar-based optical telescope to obtain a lunar-based optical telescope scientific image data frame, the fourth step of carrying out image data decompression on the lunar-based optical telescope scientific image data frame obtained by splicing if the image data are compressed image data, and the fifth step of carrying out resampling and displaying the image data.
Description
Technical field
The present invention relates to technical field of image processing, particularly relate to the process of a kind of moon base optical telescope (being called for short MUVT) science data and fast vision method, can realize to the moon base optical telescope science data real-time process and display.
Background technology
The moon, base optical telescope was the payload of lunar orbiter lander in China goddess in the moon No. three engineerings, and it bears a moon tasks of science for base optical astronomical observation, and this is that the mankind realize relying on objects outside Earth platform to carry out autonomous astronomical observation first.The moon will be made full use of there is no atmospheric interference and white turn advantage slowly, the moon the main scientific goal of base optical telescope be near ultraviolet band, monitoring is continuously carried out for a long time to the brightness change behavior in various astronomical change source; Constituency sky patrol: monitoring target mainly contains containing the leading chromospheric activity star, short period pulsating star etc. of AGN corresponding to the interaction double star of compact star, huge black hole, violent magnetic acitvity, for stellar evolution, compact star and the basic science such as black-hole physcis, High-energy Objects problem provide support.Instrument in scientific exploration process, in order to ensure MUVT can normal operation and obtain exactly with high-precision detection data, need the running status of real time monitoring equipment, need to process in real time the detection data passed down and show.
Summary of the invention
In view of this, the present invention proposes the process of a kind of month base optical telescope science data and fast vision method, it comprises:
Step 1: the data received are carried out bit synchronization, frame synchronization, descrambling and decoding, obtains the data source bag of payload;
Step 2: described payload data source bag is carried out unpacking, removing source handbag head, and extracts the science data block of each payload respectively;
Step 3: spliced by the moon base optical telescope science data block obtained, forms moon base optical telescope scientific imagery Frame;
Step 4: according to image data format, if be compressing image data, then carries out view data decompression to splicing the moon base optical telescope scientific imagery Frame obtained;
Step 5: resampling also shows described view data.
The present invention is directed to moon science data of base astronomical telescope to process in real time and the method monitoring display: receive the detector data passed down in real time, transmit and look soon.According to equipment state and the data characteristics of MUVT, adopt different mode treatment and display MUVT detection data.
Accompanying drawing explanation
Fig. 1 be in the present invention the moon base optical telescope science data fast vision method flow chart;
Fig. 2 is the data format schematic diagram of original image in the present invention;
Fig. 3 is the concrete data format schematic diagram of view data in original image in the present invention;
Fig. 4 is the data format schematic diagram of entire image in the present invention;
Fig. 5 is the data format schematic diagram of video in window in the present invention;
Fig. 6 is science data handling process schematic diagram in the present invention;
Fig. 7 be in the present invention the moon base optical telescope science data block data format schematic diagram;
Fig. 8 is the data format schematic diagram of top guide information in scientific library in the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
Fig. 1 shows the fast vision method flow chart of a kind of month provided by the invention base optical telescope science data.As shown in Figure 1, the method comprises:
Step 101: receive the science data that moon base optical telescope passes down;
Step 102: the science data received are processed and shows.
Using such method, can complete to the moon base optical telescope science data Channel Processing, science data restructuring, science data fast processing conversion etc., supported data look display soon, the operation of real time monitoring instrument and acquisition mode.
Details below with regard to each step of said method is described in detail.
The form of the science data received is as follows:
The science data stream that month base optical telescope passes down is in units of frame, and each frame data comprises frame originating point information and science data two parts, and the length of frame originating point information is fixed, and length is the length of ccd image single file just, accounts for a line.Pass under science data and comprise five kinds of patterns: original image, view picture be compressed image, view picture Lossless Compression image, window not compressed image and window Lossless Compression image not.Five kinds of lower arq mode interpretations are distinguished mainly through lower blit picture frame head, and frame head is fixed two byte content and is used for differentiate between images classification.
Entire image pattern (original image, view picture do not compress, view picture compression) ending has 6 byte flag to terminate Barker code.
Wherein, original image is made up of frame head and view data two parts, actual frame header comprises frame sync mark, telescope main body additional information, all the other frame originating point information bytes for filling, described telescope main body additional information, for identifying the parameter relevant to the work of telescope instrument and equipment and the parameter relevant with obtaining image, comprises telescope exposure relevant information, LED state, the School Affairs communication information etc.View data is after frame head data, and its size is fixed; First every a line view data is row synchronous mark and row counting, is then the capable data of true picture.Concrete form is shown in Fig. 2.
Further, described view data can be subdivided into again OverScan district, Dark district and effective pixel area, as shown in Figure 3: wherein, from row, first two columns is that row synchronously counts with row, and be then that OverScan district row and Dark district arrange, intermediate rectangular array is effective pixel area, being again Dark row and OverScan district row afterwards, is that Dark is capable below the effective pixel of rectangular array.Described OverScan district is overscanning valid data regions; Described Dark district is details in a play not acted out on stage, but told through dialogues valid data regions.
For not compressing entire image, itself and original image are distinguished and are: comprise load electric cabinet and add frame head and data through RS redundancy encoding.Described load electric cabinet adds frame head for identifying telescope equipment working state and image acquisition parameters, comprises image type, observation sequence number, refrigerator temperature, turntable information and window information etc.
Do not compress entire image to be made up of frame head and view data two parts, frame originating point information comprises frame synchronization information, telescope main body additional information, load electric cabinet additional frame header, and all the other are for filling.View data after frame head data, fixed length; First every a line image is that row synchronously counts with row, is then the capable data of true picture, sees Fig. 4.
Frame head and view data are all through RS redundancy encoding, and every fixed word festival-gathering increases the redundancy encoding of some fixed length bytes.
For compression entire image, itself and original image are distinguished and are: comprise load electric cabinet and add frame head; Eliminate row in view data synchronously to count with row; View data has carried out Lossless Compression; Data are through RS redundancy encoding.Every a line image does not comprise the synchronous and row counting of row and only has the capable data of true picture.
Under entire image compact model, in above-mentioned data, frame head does not compress, and view data is divided into the compression of n block, and the every block size of front n-1 block is consistent.After compression, before each block compressed bit stream, add synchronous code, then do RS coding.Coded system is as follows:
Frame head carries out RS coding together with first piece of compressed image (comprising synchronous code), and last not enough byte sections directly exports and do not carry out RS coding; Second piece to (n-1)th piece compressed image (comprising synchronous code) carries out RS coding, and last not enough byte sections directly exports and do not carry out RS coding.
For not compressing video in window, it is made up of frame head and video in window data two parts, does not compress video in window data and is made up of multiple subwindow, and each subwindow comprises subwindow head and subwindow data two parts; Be subwindow synchronous mark (subwindow synchronous code) before subwindow head, being then subwindow upper left corner row-coordinate and row coordinate, is subwindow view data afterwards, and video in window data are synchronous and row count information without row.Video in window form as shown in Figure 5.
Do not compress video in window frame head and view data all through RS redundancy encoding.
For compression video in window, its with do not compress video in window and distinguish and be: view data has carried out Lossless Compression.Compression video in window is made up of frame head and video in window data two parts.Compression video in window data are made up of multiple subwindow, and each subwindow comprises subwindow head and subwindow data two parts; Subwindow head is subwindow synchronous mark, is then subwindow upper left corner row-coordinate and row coordinate, and video in window data are synchronous and row count information without row.Under compression window scheme, in above-mentioned data, frame head does not compress, and view data Lossless Compression, last frame head and compressed images data are all through RS redundancy encoding.
The science data that month base optical telescope acquires are by after lander payload electric cabinet packing process, lander data handling subsystem is sent to by LVDS interface, the science data of data handling subsystem to MUVT are packed according to pseudo channel, be stored in mass storage, pass passage finally by number and be sent to ground.Month base optical telescope has the number that three kinds of down-transmitting data: MUVT work produce and passes science data, also comprises engineering parameter during description self work that MUVT gathers, as the basic status of instrument and equipment, and the parameter such as temperature and voltage; Also comprise the descending satellite telemetering data of passing of satelline payload downlink data (wherein containing the payload MUVT telemetry parameter that satellite gathers).
In the present invention, after the science data receiving above-mentioned form, need to carry out process to it and look display soon, namely perform step 102.
Particularly, science data handling process as shown in Figure 6, specifically comprises the steps:
Step 201: the detector data received is carried out bit synchronization, frame synchronization, descrambling and decoding, obtains the packet of payload;
Step 202: described payload data source bag is carried out unpacking, removing source handbag head, and extracts the science data block of each payload respectively;
Wherein, from packet, extract complete CCSDS (Consultative Committee for Space Data Systems) frame in this step: according to Framed Data form, extract CCSDS Frame according to length.
As shown in Figure 7, received CCSDS Frame, every frame comprises the postamble of the frame head of 64 bytes, the VCDU data field of 1024 bytes and 4 bytes; According to length, the Frame in the VCDU data field in every frame data is extracted; Described Frame comprises frame swynchronization code, VCDU dominates head and VCDU data cell; Wherein, described VCDU dominates head and comprises virtual channel identifier; Described VCDU data cell comprises data field and the RS checking symbol of 886 bytes, and the data field of described 886 bytes is the B-PDU data in described Frame; Described B-PDU data comprise the bit stream data territory of the top guide information of 2 bytes, the timing code of 4 bytes and 880 bytes.
Step 203: splice extracting the moon base optical telescope science data block obtained, forms moon base optical telescope scientific imagery Frame;
According to the virtual channel identification in described CCSDS data frame structure, determine the Frame (identifier of the pseudo channel VC7 of MUVT is 010000) of MUVT pseudo channel, extract and be spliced to form the virtual channel data of MUVT.
As shown in Figure 8, by the valid data in the top guide information determination bit stream data territory of the B-PDU (bit-protocol-data-unit) in described CCSDS data frame structure, then the timing code according to 4 bytes sorts to the bit stream data in described CCSDS Frame, splicing is merged into a moon base optical telescope scientific exploration view data, simultaneously according to image frame synchronization header, determine complete view data, after the 4 byte time codes extracting the first bag B-PDU bit stream data of the complete scientific imagery data of splicing squeeze into the frame synchronization head of view data.
Step 204: carry out view data decompression to splicing the moon base optical telescope science data frame obtained, be specially: according to picture frame header---the image category in load electric cabinet frame head form, view data except original image all needs to call decompression storehouse, carries out decoding or decompression:
RS decoding is carried out in view picture storehouse of not decompressing under compact model, returns the information of RS decoding;
View picture compact model decompression storehouse is carried out RS decoding and view data decompress(ion) and to be contractd populated rows synchronous head and row counting;
Window not compact model decompression storehouse carries out RS decoding;
Decompression and RS decoding are carried out in storehouse of decompressing under window compact model.
Video in window is filled to entire image (1070*1027*2B): be filled to by the ranks coordinate in the window upper left corner after load electric cabinet adds frame head in order, remove subwindow synchronous mark, foundation window coordinates value, subwindow number, subwindow line number, subwindow column number information carry out the filling of subwindow, fill with 0 value without valid data part.It may be noted that: in single-frame images, the line number columns of all subwindows is identical, and load electric cabinet frame head subwindow line number and the unification of subwindow columns territory provide.If occur, the size that subwindow actual size and frame originating point information are demarcated is not inconsistent situation, then fill by actual window;
Step 205: resampling also shows described view data;
The view data exported due to moon base optical telescope is that 16bit quantizes (signed integer), and the quantized value showing described view data is 8bit, and namely intensity value ranges is 0 ~ 255.Therefore, when the count value (hereinafter referred to as DN value, data number) on the single pixel to moon basic image carries out the mapping from 16bit to 8bit, after following three kinds of method for resampling can be adopted to carry out resampling, show:
(1) DN (Digital Number) value for each pixel in image is averaged, and obtain mean value mean, described DN value is the brightness value of each picture dot in described image; The standard deviation stddev of computed image DN value.Choose z1=mean-m × stddev, z2=mean+n × stddev, wherein m, n are the coefficient that can arrange.Then according to following formula, the DN value of each picture dot in described image is mapped in 0 ~ 255 grade of gray scale, obtains 8bit quantized value:
(z-x1) * (z2-z1)/(x0-x1), wherein, x0 and x1 is respectively picture dot maximum DN value and minimum DN value in described image, and z is the picture dot DN value of current mapping on described image;
(2) the DN value for each pixel in image sorts, and finds intermediate value median; The standard deviation stddev of computed image DN value.Choose z1=median-m × stddev, z2=median+n × stddev, wherein m, n are the coefficient that can arrange.Mapping mode is the same.
(3) select DN in image and put in order the DN value of the pixel being in c% (its original gray level is DN (c%)) and 1-c% (its original gray level is DN (1-c%)) for z1 and z2; That is reject the DN of the minimum and maximum c% of gray scale, the gray scale of middle 1-2 × c% is mapped to 0 ~ 255, and wherein c is the coefficient that can arrange.Concrete mapping mode is the same.
In addition, during display image, for video in window, correct ranks place display subwindow (can be gray value 0 without subwindow place) of whole two field picture.
The said method that the present invention proposes also comprises:
The MUVT view data received by each survey station respectively singly to be stood sequence according to timing code, forms the view data of certain certain receiving station of passing by of MUVT.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the process of month base optical telescope science data and a fast vision method, it comprises:
Step 1: the data received are carried out bit synchronization, frame synchronization, descrambling and decoding, obtains the data source bag of payload;
Step 2: described payload data source bag is carried out unpacking, removing source handbag head, and extracts the science data block of each payload respectively;
Step 3: spliced by the moon base optical telescope science data block obtained, forms moon base optical telescope scientific imagery Frame;
Step 4: according to image data format, if be compressing image data, then carries out view data decompression to splicing the moon base optical telescope scientific imagery Frame obtained;
Step 5: resampling also shows described view data.
2. the method for claim 1, wherein received data comprise five kinds of data formats: original image, view picture be compressed image, view picture Lossless Compression image, window not compressed image and window Lossless Compression image not;
Wherein, described original image is made up of frame head and view data two parts, and frame head comprises frame sync mark, telescope main body additional information, all the other frame originating point information bytes are filling information, and view data is after frame head, and its size is fixed; First every a line view data is row synchronous mark and row counting, is then the capable data of true picture;
Described entire image of not compressing is made up of frame head and view data two parts, frame head comprises frame synchronization information, telescope main body additional information, load electric cabinet additional frame header, all the other frame originating point information bytes are filling information, and view data is after frame head, and its size is fixed; First every a line view data is row synchronous mark and row counting, is then the capable data of true picture; Frame head and view data are all through RS redundancy encoding;
Described compression entire image is made up of frame head and view data two parts, frame head comprises frame synchronization information, telescope main body additional information, load electric cabinet additional frame header, all the other frame originating point information bytes are filling information, and view data is after frame head, and its size is fixed; Every a line view data only includes the capable data of true picture; View data has carried out Lossless Compression, and frame head and view data are all through RS redundancy encoding;
Describedly do not compress video in window it is made up of frame head and video in window data two parts, frame head comprises frame synchronization information, telescope main body additional information, load electric cabinet additional frame header; Described video in window data are made up of multiple subwindow, and each subwindow comprises subwindow head and subwindow data two parts; Be subwindow synchronous mark before subwindow head, being then subwindow upper left corner row-coordinate and row coordinate, is subwindow view data afterwards, and video in window data are synchronous and row count information without row; Frame head and view data are all through RS redundancy encoding;
Described compression video in window its be made up of frame head and video in window data two parts, frame head comprises frame synchronization information, telescope main body additional information, load electric cabinet additional frame header; Described video in window data are made up of multiple subwindow, and each subwindow comprises subwindow head and subwindow data two parts; Be subwindow synchronous mark before subwindow head, being then subwindow upper left corner row-coordinate and row coordinate, is subwindow view data afterwards, and video in window data are synchronous and row count information without row; Described video in window data have carried out Lossless Compression; Frame head and view data are all through RS redundancy encoding.
3. method as claimed in claim 2, wherein, the view data piecemeal in described compression entire image compresses, and adds synchronous code, then carry out RS coding before each block packed data; Wherein RS coded system is as follows:
Frame head one first piece of compressed image carries out RS coding together, and last not enough byte sections directly exports and do not carry out RS coding; Second piece is carried out RS coding to last block packed data, and not enough byte sections directly exports and do not carry out RS coding.
4. the method for claim 1, wherein received data are the data after packing according to pseudo channel, and each packet comprises multiple frame; Each frame comprises frame head, data field and postamble, stores CCSDS Frame in described data field, and comprise frame swynchronization code, leading head and data cell, described leading head comprises virtual channel identifier; Described data cell comprises B-PDU data and RS checking symbol.
5. method as claimed in claim 4, wherein, extracts described CCSDS Frame from packet in step 2; According to virtual channel identifier, the Frame extracted is spliced in step 3.
6. method as claimed in claim 2, wherein, in step 4, judges the picture data type mark formed in moon base optical telescope scientific imagery Frame, and decompresses to the image of the other types except original image.
7. method as claimed in claim 2, wherein, in step 4, for compressing video in window and not compressing video in window, is handled as follows, to form entire image:
According to row-coordinate and the row coordinate in the window upper left corner in frame head, be filled to after load electric cabinet adds frame head in order, remove subwindow synchronous mark, foundation window coordinates value, subwindow number, subwindow line number, subwindow column number information carry out the filling of subwindow, fill with 0 value without valid data part; If there is the situation that the size that subwindow actual size and frame head are demarcated is not inconsistent, then by window actual enter size row fill.
8. the method for claim 1, wherein can adopt following three kinds of resampling modes in step 5:
(1) the DN value for each pixel in image is averaged, and obtains mean value mean, and described DN value is the brightness value of each picture dot in described image; The standard deviation stddev of computed image DN value; Choose z1=mean-m × stddev, z2=mean+n × stddev, wherein m, n are the coefficient that can arrange;
(2) the DN value for each pixel in image sorts, and finds intermediate value median; The standard deviation stddev of computed image DN value; Choose z1=median-m × stddev, z2=median+n × stddev, wherein m, n are the coefficient that can arrange;
(3) select picture dot DN value in image and put in order the DN value of the pixel being in c% and 1-c% for z1 and z2;
Above-mentioned three kinds of modes, after calculating z1 and z2, the image picture elements value after utilizing following formula to obtain resampling: (z-x1) * (z2-z1)/(x0-x1);
Wherein, x0 and x1 is respectively the maximum DN value of picture dot in described image and minimum DN value, and z is the picture dot DN value of current mapping on described image.
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| CN109141651A (en) * | 2018-10-24 | 2019-01-04 | 中国科学院遥感与数字地球研究所 | Month base earth observation platform thermal infrared sensor Imaging Simulation method |
| CN110868272A (en) * | 2019-11-18 | 2020-03-06 | 中国科学院电子学研究所 | High code rate satellite real-time quick-look processing system and method based on server cluster |
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Application publication date: 20150121 |