CN103402043A - Image compression unit for large visual field TDICCD camera - Google Patents
Image compression unit for large visual field TDICCD camera Download PDFInfo
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Abstract
The invention discloses an image compression unit for a large visual field TDICCD camera, which includes an image sparse representation part, a bit plane entropy coding part and a rate control part, wherein the image sparse representation part includes the steps of firstly performing 3-level 9/7 wavelet transformation to the image, generating 1 low-frequency subband and 9 high-frequency subbands, and performing the post transformation to the 9 high-frequency subbands; the bit plane entropy coding part includes the steps of performing BPE coding to post transformation factors, and performing entropy coding to the coding result, coding a wavelet low-frequency subband through prediction, and performing entropy coding to a predicated residual error. According to the invention, the Hadamard single-machine dictionary post transformation strategy in the wavelet domain can be adopted to remove dependency among wavelet factors in the wavelet subband, the defect that the wavelet transformation is poor in sparse representation capability of remote sensing images with texture complex degree can be made up, rich information of the space CCD image borders and textures can be well protected; the image compression unit has the characteristics of excellent compression performance, moderate complex rate and high reliability, and is suitable for being used on satellites.
Description
Technical field
The invention belongs to Space CCD Camera image compression field, be specifically related to a kind of image compressing device of large view field space TDICCD camera.
Background technology
Develop rapidly along with aeronautical and space technology, space camera improving constantly on visual field and spatial resolution index request based on the TDICCD imaging technique, the CCD splicing sheet number and the read-out speed that adopt also are on the increase and improve, thereby make the ccd image data volume after digitlization be exponent increase.Bring huge challenge to satellite image storage and transmission, therefore be necessary very much to carry out image compression.
The space ccd image is generally used for target detection and identification, mainly rely on the geometric profile feature to confirm to the judgement of important goal in the ccd image of space at present, therefore, Space CCD Camera has that the imaging coverage is large, the output image data amount large and the image characteristics such as to have resolution high, and the sampled value quantization digit is many.The remote sensing images of taking have the high frequency information such as a large amount of edge contours and texture region usually, and details is abundant complicated.Therefore, Space CCD Camera has higher requirement to the image compression algorithm performance, needs compression algorithm can well protect edge and the textural characteristics of image.
At present, the common method that is suitable for Remote Sensing Image Compression is JPEG2000 and CCSDS IDC algorithm.Two kinds of algorithms have harmless and lossy compression method pattern.The Lossless Compression pattern can guarantee that image compression and reconstructed image do not have energy loss fully, can well protect edge and the textural characteristics of image.Yet the Lossless Compression compression ratio is lower, and usually between 3:1～1:1, and compression ratio is different along with the difference of characteristics of image.Therefore be unsuitable for the traditional design of space camera view data, compression ratio also is difficult to reach requirement simultaneously.Therefore, space camera does not adopt the Lossless Compression pattern usually.For the lossy compression method pattern, JPEG2000 has adopted wavelet transform and optimum to block embedded encoder (EBCOT) technology, make it have scalable, the characteristics such as fault-tolerant ability strong, high compression performance, yet its calculation of complex, need take a large amount of internal memories, be difficult to reach requirement of real time, hardware is realized very difficult.CCSDS IDC hardware algorithm is realized simple, is applied in deep space, and its compression performance and JPEG2000 are suitable.Therefore, it is fit to the high-performance image compression applications occasion of Space CCD Camera very much.
Yet the target that traditional CCSDS IDC algorithm proposes is for all image compression application scenarios.CCSDS IDC algorithm only adopts wavelet transformation to carry out image sparse to represent.And the 2 dimension wavelet transformations of CCSDS IDC are to carry out independently 1 dimension wavelet transformation 2 times in the horizontal and vertical direction.And space ccd image texture is very complicated, not only has the horizontal and vertical direction, may also have other characteristic directions.The 2 dimension wavelet transformations of CCSDS IDC can not reflect texture and the marginal information on other directions of image effectively, thereby may cause the fuzzy of image border.CCSDS IDC algorithm adopts and to compress take section as unit wavelet coefficient, also adopt impartial Rate Distribution Strategy to every section, yet the amount of information that different code section has is different and different along with picture material.Some yard section belongs to the zone of edge and texture-rich, and some belongs to smooth domain.If adopt unified Rate Distribution Strategy, must make the abundant territory, regional peace skating area of texture level distribute identical code check, may cause the fuzzy of edge and texture region like this.Therefore, traditional C CSDS IDC algorithm can not finely sparsely represent remote sensing images, and Rate Control efficiency is poor, finally the information of guard space ccd image edge and texture-rich well.
Summary of the invention
The large visual field panchromatic TDICCD camera image compression algorithm how design complexities is moderate, compression performance is good, reliability is high, providing new technological means for the compression method of Space CCD Camera image is technical problem to be solved by this invention, for this reason, the image compressing device that the purpose of this invention is to provide a kind of large view field space TDICCD camera.
In order to solve the problems of the technologies described above, technical scheme of the present invention is specific as follows:
A kind of image compressing device of large view field space TDICCD camera comprises: conversion after buffer memory, 3 grade of 9/7 lifting wavelet transform, Hadamard list base dictionary, CCSDS-IDC segment information, bit plane entropy coding, total bitrate calculating, bit-allocation control device, segment information estimation and weight calculation, Bit-Plane Encoding depth controller, code stream tissue;
In this image compressing device, described buffer memory can be constructed a two field picture, and image carries out 3 grade of 9/7 wavelet transformation, generates 1 low frequency sub-band and 9 high-frequency sub-band; Then can carry out conversion after Hadamard list base dictionary to 9 high-frequency sub-band; Bit plane entropy coding carries out the BPE coding with rear conversion coefficient, and coding result is carried out the entropy coding, and the small echo low frequency sub-band is encoded by prediction, and prediction residual is carried out the entropy coding; Rate Control is that BPE reasonably distributes code check, and control coding stops.
In technique scheme, described buffer memory adopts streamline ping-pong operation SDRAM as the picture frame constructing apparatus.
In technique scheme, this image compressing device adopts the rate control algorithm of code check preassignment strategy, has avoided the closed loop of compression algorithm.
The present invention has following beneficial effect:
The image compressing device of large view field space TDICCD camera of the present invention, can keep preferably profile and the texture information of remote sensing images, can realize accurate Rate Control, have the performance of error resiliency, moderate complexity, be fit to the limited satellite platform application of resource and power consumption.
The image compressing device of large view field space TDICCD camera of the present invention,, for the imaging of linear array TDI-CCD push-broom type, adopt different wavelet transform type according to different characteristics of image;
The image compressing device of large view field space TDICCD camera of the present invention, carry out transition coding strategy after Hadamard list base dictionary to wavelet coefficient, and hardware is realized simple, and the rarefaction representation ability is strong.
The image compressing device of large view field space TDICCD camera of the present invention, adopt CCSDS-IDC Bit-Plane Encoding strategy to wavelet coefficient, and hardware is realized simple.
The image compressing device of large view field space TDICCD camera of the present invention, adopt two step information estimators, according to the different images feature, carries out adaptive Data Rate Distribution, can keep preferably profile and the texture information of remote sensing images, realizes accurate Rate Control.
Description of drawings
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the image compressing device block diagram of TDICCD camera.
Fig. 2 is mapped structure block diagram after Hadamard list base dictionary.
Embodiment
Invention thought of the present invention is: at first buffer memory is constructed a two field picture, and image carries out 3 grade of 9/7 wavelet transformation, generates 1 low frequency sub-band and 9 high-frequency sub-band.9 high-frequency sub-band are carried out conversion after the basic dictionary of list.Bit plane entropy coding carries out the BPE coding with rear conversion coefficient, and coding result is carried out the entropy coding, and the small echo low frequency sub-band is encoded by prediction, and prediction residual is carried out the entropy coding.Rate Control is that BPE reasonably distributes code check, and control coding stops.
Below in conjunction with accompanying drawing, the present invention is done to describe in detail.
The image compressing device of the panchromatic TDICCD camera of a kind of large view field space of the present invention comprises: conversion after buffer memory, 3 grade of 9/7 lifting wavelet transform, Hadamard list base dictionary, CCSDS-IDC segment information, DC coefficient and AC coefficient bits plane coding, bit plane entropy coding, total bitrate calculating, bit-allocation control device, segment information estimation and weight calculation, Bit-Plane Encoding depth controller, code stream tissue.
Described buffer memory is from receiving the ccd image with behavior unit, and constructs the picture frame that meets image compression, and compression is take picture frame as unit; Adopt streamline ping-pong operation SDRAM as the picture frame constructing apparatus, the ccd image that can realize efficiently the unit of going is configured to the image compression frame, and can realize processing multichannel CCD function;
After image sparse represents to adopt 3 grade of 9/7 lifting wavelet transform in conjunction with Hadamard list base dictionary, the mode of conversion combination, improved image sparse and represented ability, uses the smaller entropy coding of being convenient to back of wavelet coefficient.
3 grade of 9/7 lifting wavelet transform is fit to the VLSI structural design very much, and calculates very fast.
Adopted conversion after Hadamard list base dictionary in wavelet field, only had plus and minus calculation when Hadamard list base dictionary calculates on the one hand, computation complexity is very low.Be the blocking artifact that the conversion again carried out in wavelet field is avoided on the other hand, and removed the coefficient of amplitude in the wavelet field.
Rear conversion coefficient has adopted the BPE scanning encoding, and making encodes has the characteristics of progressive transmission, has improved the reliability of compression algorithm.
Adopted the rate control algorithm of code check preassignment strategy, avoided the closed loop characteristics of compression algorithm, used algorithm to be easier to hardware and realize.
Described frame-structuring device adopts the SDRAM of streamline ping-pong operation, and SDRAM can fast cache one two field picture.
Described 9/7 lifting wavelet transform, adopt quick 2D lift structure strategy, is fit to very much hardware and realizes.
After described Hadamard list base dictionary, conversion is that wavelet coefficient is organized into 4 * 4 coefficient block, to conversion after each coefficient block employing Hadamard list base dictionary, coefficients by using after conversion is carried out best back based on 10 norms change selection, best rear conversion selects calculating formula to be:
Described CCSDS-IDC carries out Bit-Plane Encoding to rear conversion coefficient, can realize the code stream progressive transmission.
Described code check control algorithm comprises: total bitrate calculating, bit-allocation control device, segment information estimation and weight calculation, Bit-Plane Encoding depth controller.
The operation principle of the image compressing device of the panchromatic TDICCD camera of a kind of large view field space of the present invention is: at first buffer unit is constructed a two field picture, and image carries out 3 grade of 9/7 wavelet transformation, generates 1 low frequency sub-band and 9 high-frequency sub-band.9 high-frequency sub-band are carried out conversion after the basic dictionary of list.Bit plane entropy coding carries out the BPE coding with rear conversion coefficient, and coding result is carried out the entropy coding, and the small echo low frequency sub-band is encoded by prediction, and prediction residual is carried out the entropy coding.Rate Control is that BPE reasonably distributes code check, and control coding stops.
Obviously, above-described embodiment is only for example clearly is described, and is not the restriction to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all execution modes exhaustive.And the apparent variation of being extended out thus or change still are among the protection range of the invention.
Claims (3)
1. the image compressing device of a large view field space TDICCD camera, it is characterized in that, comprising: conversion after buffer memory, 3 grade of 9/7 lifting wavelet transform, Hadamard list base dictionary, CCSDS-IDC segment information, bit plane entropy coding, total bitrate calculating, bit-allocation control device, segment information estimation and weight calculation, Bit-Plane Encoding depth controller, code stream tissue;
In this image compressing device, described buffer memory can be constructed a two field picture, and image carries out 3 grade of 9/7 wavelet transformation, generates 1 low frequency sub-band and 9 high-frequency sub-band; Then can carry out conversion after Hadamard list base dictionary to 9 high-frequency sub-band; Bit plane entropy coding carries out the BPE coding with rear conversion coefficient, and coding result is carried out the entropy coding, and the small echo low frequency sub-band is encoded by prediction, and prediction residual is carried out the entropy coding; Rate Control is that BPE reasonably distributes code check, and control coding stops.
2. the image compressing device of large view field space TDICCD camera according to claim 1, is characterized in that, described buffer memory adopts streamline ping-pong operation SDRAM as the picture frame constructing apparatus.
3. the image compressing device of large view field space TDICCD camera according to claim 1, is characterized in that, this image compressing device adopts the rate control algorithm of code check preassignment strategy, avoided the closed loop of compression algorithm.
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| CN110943744A (en) * | 2019-12-03 | 2020-03-31 | 杭州嘉楠耘智信息科技有限公司 | Data compression, decompression and processing method and device based on data compression and decompression |
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