CN102821277B - Data compression method and data compression system based on image set - Google Patents
Data compression method and data compression system based on image set Download PDFInfo
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- CN102821277B CN102821277B CN201210251974.8A CN201210251974A CN102821277B CN 102821277 B CN102821277 B CN 102821277B CN 201210251974 A CN201210251974 A CN 201210251974A CN 102821277 B CN102821277 B CN 102821277B
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Abstract
The invention discloses a data compression method based on an image set. The data compression method comprises the following steps: selecting basic images of which the size is the same as a to-be-transmitted original image from an image data set; calculating the original image and each basic image to obtain a generated image; compressed encoding the generated image, and transmitting compressed encoding data of the generated image having the best compressed encoding effect as the transmission data for transmission; decoding the transmission data by a receiving end to obtain the generated image; and extracting the original image from the generated image by use of basic images which are the same with the transmitting end. The invention also provides a data compression system based on the image set. Based on the existing compression method, the better compression and safe transmission of the original image can be achieved by use of the image set.
Description
Technical field
The invention belongs to technical field of image processing, relate to a kind of data compression method based on image set and system.
Background technology
Along with the development of science and technology, the demand of people to high-definition picture is increasing, but the data volume of high-definition picture is very large, brings very large pressure to storage and transmission; Therefore, people are always improving compression ratio and the compression quality of Image Data Compression by every means.
At present, no matter how advanced method for compressing image is, always there is following problem:
(1) image compression effect changes with picture characteristics change
Effective to a part of image compression, bad to another part image compression effect.With objective evaluation criteria, Y-PSNR PSNR may differ many, some reported literature gap 30dB.
Such as, same compression method, to a certain Remote Sensing Image Compression, PSNR is about 30dB, and to other Remote Sensing Image Compression, PSNR may be about 35dB.To some personages, scene image compression, PSNR may be 40dB, and to other personages, scene image compression, PSNR may be 45dB even 50dB.
(2) image compression apparatus succeeded in developing is better to most of image compression effect, but bad to some image compression effects, and user also wants to continue to use this compression device.
Therefore, if we first pass through original image A to convert multiple image to someway, characteristic and the original image of multiple image create different, compress respectively multiple image, select best the carrying out of compression effectiveness to transmit, carry out decompression after transmission and recover original image A.The transform method adopted, the compression effectiveness that can obtain.
(3) current data compression method is that original image itself is carried out compression transmission, receiving terminal carries out decompressing and directly obtains original image, but directly just obtain original image after user does not wish decompress(ion) sometimes, but obtain the alternate image being different from original image after wishing decompress(ion), obtain original image again through certain computing, there is certain level security.
Summary of the invention
Technology of the present invention is dealt with problems and is: for the deficiencies in the prior art, provides a kind of data compression method based on image set, utilizes image set to achieve more excellent compression to original image and safe transmission according to existing compress mode.Meanwhile, present invention also offers a kind of data compression system based on image set adopting the method for the invention.
Technical solution of the present invention is:
Based on a data compression method for image set, comprise the following steps:
Concentrate in view data and select the base image identical with the size of original image waiting for transmission;
Described original image and each base image are carried out computing respectively and obtains synthetic image;
Compressed encoding is carried out to described synthetic image, the compress coding data of synthetic image best for compressed encoding effect is sent as transmission data;
Receiving terminal obtains synthetic image to transmission data decoding;
The base image identical with transmitting terminal is utilized to extract original image from described synthetic image.
Further, described image data set comprises standard drawing image set and application-oriented image set; Described standard drawing image set is made up of daily life typical image; Described application-oriented image set is made up of typical field of application typical image.
Further, described synthetic image carries out XOR acquisition by described base image and described original image by turn by gray value.
Further, described compressed encoding effect is determined by the following method:
When carrying out compressed encoding to synthetic image by compression ratio, described compressed encoding effect is determined according to the Y-PSNR of synthetic image; When carrying out no-distortion compressing and coding to synthetic image, described compressed encoding effect is determined according to the size of compression ratio.
Further, there is in the transmission data that the compressed coding of described synthetic image generates the reservation position for embedding described base image sequence number; Determine according to the base image sequence number in described reservation position the base image extracting original image at receiving terminal.
Data compression system based on image set of the present invention, comprises image transmitting element, image receiving unit, also comprises: base image unit, operation coding unit and decoding inverse operation unit,
Described base image unit is concentrated from view data and is extracted the base image identical with raw image data size;
Described operation coding unit obtains synthetic image after raw image data and every width base image are carried out XOR by turn by gray value; Compressed encoding is carried out to described synthetic image, the compress coding data of synthetic image best for compressed encoding effect is sent by image transmitting element as transmission data;
Described decoding inverse operation unit carries out decoding to the transmission data that image receiving unit receives and obtains synthetic image, and utilizes the base image identical with transmitting terminal to extract raw image data from synthetic image.
Further, described image data set comprises standard drawing image set and application drawing image set; Described standard drawing image set is made up of daily life typical image; Described application drawing image set is made up of typical field of application typical image.
Further, described compressed encoding effect is determined by the following method:
When carrying out compressed encoding to synthetic image by compression ratio, described compressed encoding effect is determined according to the Y-PSNR of synthetic image; When carrying out no-distortion compressing and coding to synthetic image, described compressed encoding effect is determined according to the size of compression ratio.
Further, there is in the transmission data that the compressed coding of described synthetic image generates the reservation position for embedding described base image sequence number; Described decoding inverse operation unit determines according to the base image sequence number in described reservation position the base image extracting original image.
The present invention compared with prior art tool has the following advantages:
In traditional image compressing transmission, that compression process is directly carried out to image, as carried out preliminary treatment, DCT, wavelet transformation, conversion compression traditional is in other words non-picture data image conversion become in transform domain, then carries out compression transmission to the data after conversion.And the present invention utilizes known image data collection that original image is converted to several synthetic images in addition, and by studying the compression performance of several synthetic images, the effective synthetic image of compression is selected to carry out compression transmission, as long as there is an amplitude ratio original image in synthetic image more hold squeezable image, adopt the method for the invention just can obtain performance more better than existing compression method.Meanwhile, through the fusion treatment of original image and synthetic image, former image to be transmitted is also served to the effect of encryption, add the fail safe of image transmitting.
(1) the present invention utilizes typical image data set, original image is transformed to synthetic image, because image data set adopts standard drawing image set and application drawing image set, therefore type is represented strong, contain wide, several synthetic images after conversion probably have a width more easily to compress, thus existing compression method can be utilized to obtain image compression performance more better than conventional method.Be equivalent to when compression effectiveness is the worst only compress original image, and compression method is the same with existing method.
(2) according to the composition of the method for the invention and described system, transmitting terminal and the receiving terminal of image have dissymmetrical structure, the decoding simplicity of design of image-receptive end, therefore, the present invention is adopted more to be conducive to the simplification of receiving device, easy to utilize, except being suitable for proper communication, also be suitable for point-to-multipoint delivery, or broadcast communication.
(3) as the synthetic image of transmitting image, conventional information encryption method need not be adopted just to have certain secret effect, there is simple, practical feature, the method being simply easy to realize can be adopted, as two width images of the present invention press gray value XOR by turn, save and realize cost, reduce secrecy system complexity, improve transmission reliability.
Accompanying drawing explanation
Fig. 1 is the inventive method flow chart;
Fig. 2 is present system schematic diagram.
Embodiment
Just by reference to the accompanying drawings the present invention is described further below.
The compression method of view data of the present invention and system are in order to solve Large Copacity, high-definition picture safe transmission problem and proposing, utilize given data collection, original image is converted to several synthetic images, and by studying the compression performance of each width synthetic image, the synthetic image selecting compression effective is as transmission data.Adopt the present invention that existing compression method can be utilized to obtain to the better compression performance of original image waiting for transmission, certain protective effect is also served to original image, adds the fail safe of original image transmission.
Be illustrated in figure 1 the inventive method flow chart, specific implementation step is as follows:
(1) the original image A sent as required concentrates the base image B1 selecting n width formed objects in view data, B2 ..., Bn, wherein, n is the number of the base image identical with original image A size.The size of described original image A is that M is capable, N row, Q bit quantization, and total bit number is MNQ; Described base image Bi (i=1 ..., n) size is that M is capable, N row, Q bit quantization, and total bit number is the gray value Gi of MNQ, base image Bi is between 0 to 2
qpositive integer between-1.Described image data set comprises standard drawing image set, ground daily standard drawing image set and application-oriented image set.Standard drawing image set, ground daily general image centralized procurement daily life typical image form this image set.This image set is made up of images such as Lena, Baboon, Airplane, Boat, Goldhill, Pepper, and n can be less than or equal to 10.Application-oriented image set, according to different application scenarios, select typical field of application typical image to set up image set, such as texture searching, face database, satellite remote sensing object library etc., n according to circumstances chooses occurrence.
(2) by original image A respectively and the n width base image B1 that selects, B2 ..., Bn carries out arithmetic operation synthesis piece image, thus obtains n secondary synthetic image C1, C2 respectively ..., Cn; A kind of mode being obtained described synthetic image Ci by arithmetic operation is, described base image and described original image are carried out XOR acquisition by turn by gray value.Or adopt other compute modes.
(3) carry out compressed encoding to the synthetic image Ci obtained, coded system can, for the compressed encoding carried out according to compression ratio R, also can be no-distortion compressing and coding.In the compressed encoding carried out according to compression ratio R, to original image A and synthetic image C1, C2, ..., Cn carries out compressed encoding respectively, select the synthetic image Cj that compression effectiveness is best, j is the sequence number of the best synthetic image of compression effectiveness, and same j is also the sequence number of the base image for generating this synthetic image.If j=0, then represent that the compression effectiveness carried out after compressed encoding original image A is best.These sequence number j data are embedded in the position of reservation in advance of the transmission data generated afterwards by the compressed coding of synthetic image, thus can transmit data to reach receiving terminal time, the sequence number of base image is transferred to receiving terminal simultaneously.
Compression effectiveness can be divided into the following two kinds according to the mode of the compressed encoding adopted:
Method one: according to compression ratio R to C1, C2 ..., Cn carries out compressed encoding respectively, calculates the Y-PSNR PSNR of each width image, and the image selecting Y-PSNR PSNR maximum is as Cj image.
Method two: to C1, C2 ..., Cn carries out Lossless Compression respectively, calculates respective compression ratio, by the large minispread of compression ratio, selects the maximum image of compression ratio as Cj image.
(4) receiving terminal carries out decompress(ion) decoding to the transmission data received and to be restored image Cj, carry out serial number information extraction again and obtain j, the base image Bj utilizing data centralization corresponding with sequence number j carries out the computing with transmitting terminal contrary, thus recovers original image A.
Corresponding to method described in the embodiment of the present invention, be illustrated in figure 2 present system schematic diagram.Data compression system based on image set of the present invention comprises, the base image unit of transmitting terminal, operation coding unit and image transmitting element; The image receiving unit of receiving terminal and decoding inverse operation unit.
At transmitting terminal, image basis unit according to method step (1) view data concentrate select the n width base image Bi identical with original image A size to be transmitted (i=1,2 ..., n).
Operation coding unit carries out compressed encoding according to method step (2) to original image A and n width base image Bi, thus obtains the secondary synthetic image Ci of the n corresponding to each base image.The compression effectiveness of the described operation of further employing method step (3) to synthetic image Ci is assessed, and determines that the packed data of the synthetic image that compression effectiveness is best is as transmission data, and utilizes image transmitting element to be sent to receiving terminal.
At receiving terminal, image receiving unit receives transmission data, and the transmission data received are exported to decoding inverse operation unit.Decoding inverse operation unit proposes synthetic image according to method step (4) from transmission data, and employing carries out inverse operation with the operation of transmitting terminal operation coding unit contrary to synthetic image, obtains original image.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (3)
1., based on a data compression method for image set, it is characterized in that comprising the following steps:
Concentrate in view data and select the base image identical with the size of original image waiting for transmission, described image data set comprises standard drawing image set and application-oriented image set; Described standard drawing image set is made up of daily life typical image; Described application-oriented image set is made up of typical field of application typical image;
Described original image and each base image are carried out computing respectively and obtains synthetic image; Described computing refers to carries out XOR by turn by gray value;
Compressed encoding is carried out to described synthetic image, the compress coding data of synthetic image best for compressed encoding effect is sent as transmission data; Be specially:
When carrying out compressed encoding to synthetic image by compression ratio, according to compression ratio, respectively compressed encoding is carried out to each synthetic image, the Y-PSNR PSNR of each image after calculating compressed encoding, selects the maximum image compression encoding data of Y-PSNR PSNR to send as transmission data;
When carrying out no-distortion compressing and coding to synthetic image, respectively Lossless Compression is carried out to each synthetic image, calculate the compression ratio of each synthetic image, and each synthetic image after Lossless Compression is arranged from big to small by compression ratio, select the maximum image compression encoding data of compression ratio and send as transmission data;
Receiving terminal obtains synthetic image to transmission data decoding;
The base image identical with transmitting terminal is utilized to extract original image from described synthetic image.
2. a kind of data compression method based on image set as claimed in claim 1, is characterized in that: have the reservation position for embedding described base image sequence number in the transmission data that the compressed coding of described synthetic image generates; Determine according to the base image sequence number in described reservation position the base image extracting original image at receiving terminal.
3. based on a data compression system for image set, comprise image transmitting element, image receiving unit, it is characterized in that, also comprise: base image unit, operation coding unit and decoding inverse operation unit,
Described base image unit is concentrated from view data and is extracted the base image identical with raw image data size;
Described operation coding unit obtains synthetic image after raw image data and every width base image are carried out XOR by turn by gray value; Compressed encoding is carried out to described synthetic image, the compress coding data of synthetic image best for compressed encoding effect is sent by image transmitting element as transmission data;
Described decoding inverse operation unit carries out decoding to the transmission data that image receiving unit receives and obtains synthetic image, and utilizes the base image identical with transmitting terminal to extract raw image data from synthetic image.
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| CN105163122B (en) * | 2015-08-27 | 2017-12-22 | 西安空间无线电技术研究所 | A kind of compression of images and decompression method based on image block similarity |
| CN106604040A (en) * | 2016-12-12 | 2017-04-26 | 中国矿业大学 | Multi-image encryption method based on mixed primitives and full permutation |
| CN111881438B (en) * | 2020-08-14 | 2024-02-02 | 支付宝(杭州)信息技术有限公司 | Method and device for carrying out biological feature recognition based on privacy protection and electronic equipment |
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| CN1852440A (en) * | 2006-04-24 | 2006-10-25 | 李博航 | Image processing method of increasing information encoding-decoding efficiency |
| CN101039374A (en) * | 2006-03-14 | 2007-09-19 | 联想(北京)有限公司 | Image lossless compression and image decompressing method |
| CN102523452A (en) * | 2011-12-29 | 2012-06-27 | 西安空间无线电技术研究所 | Method for conversion, compression and transmission of images |
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| CN101039374A (en) * | 2006-03-14 | 2007-09-19 | 联想(北京)有限公司 | Image lossless compression and image decompressing method |
| CN1852440A (en) * | 2006-04-24 | 2006-10-25 | 李博航 | Image processing method of increasing information encoding-decoding efficiency |
| CN102523452A (en) * | 2011-12-29 | 2012-06-27 | 西安空间无线电技术研究所 | Method for conversion, compression and transmission of images |
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