CN103533371B - A kind of based on image conversion and the data compression transmission method of image watermark - Google Patents
A kind of based on image conversion and the data compression transmission method of image watermark Download PDFInfo
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Abstract
The invention discloses a kind of based on image conversion and the data compression transmission method of image watermark, by first decomposing image, set criteria thresholds, the subimage meeting index does not converts；The subimage not reaching index carries out functional transformation, and gray scale becomes the most smooth, is merged by two drawing of seeds pictures and forms complete image, embeds watermark and type function wherein, will contain watermarking images and carry out data compression transmission.Receiving terminal extracts watermark by decompressing from containing watermarking images, recovers original varitron image, then obtains original image through inverse transformation.The present invention ensures that image recovers the quality of image in the case of given compression ratio and meets regulation requirement, hence it is evident that be better than directly carrying out the result of data compression.The present invention is not in the case of affecting compression of images Quality of recovery, not increasing transmitted data amount simultaneously, the watermark information of image is embedded in image transmission, improves the efficiency of image transmitting, and the application for image is provided convenience.
Description
Technical field
The present invention relates to a kind of based on image conversion and the data compression method of image watermark, belong to technical field of image processing.
Background technology
Data transmission and image procossing are the important subject of the current communications field.Along with the development of science and technology, people are increasing to the demand of high-definition picture, and data compression is imperative.
Data compression is divided into lossy compression method and lossless compression method, and compression method compression ratio is bigger, but recovers image after compression and there is certain information loss with original image, as long as subjective evaluation index meets the requirements, does not has much impacts in practice to application.Recovering image after lossless compression method compression and there is not information loss with original image, but compression ratio is the least, general about 2 times, use occasion is limited, is not easy to carry out data transmission.The compression method that general high speed data transmission system uses is mostly compression method, and compression ratio is generally about 4 times, and for image, general Y-PSNR (PSNR) more than 35dB, more than 40dB effect is the most more satisfactory.
Current image data compression method has many, and representational have JPEG and JPEG2000.Owing to compression standard algorithm function is the most, algorithm is relevant with image self character, and existing method for compressing image compression effectiveness for the images such as some such as Aeronautics and Astronautics remote sensing is unsatisfactory.Satisfied picture quality can only be obtained by reducing compression ratio in practicality.All images are used identical compression method by existing method not difference image content, and compression of images effect complicated to texture, continuous pixels difference is the most undesirable.Therefore, now it is badly in need of studying a kind of image data compression method and improves the compression of images Quality of recovery of view data transmission further.
Summary of the invention
The technology of the present invention solves problem: overcome the deficiencies in the prior art, provide a kind of based on image conversion and the data compression method of image watermark, improve the quality that the compression of images of view data transmission is recovered, simultaneously in the case of not affecting compression of images Quality of recovery, not increasing transmitted data amount, improve the efficiency of image transmitting by image watermark method, the application for image is provided convenience.
The technical solution of the present invention is:
A kind of data compression transmission method based on image conversion, comprises the following steps that
(1) being several initial carrier subimages by initial carrier picture breakdown, several initial carrier subimages described are the nonoverlapping piecemeal of original image, keep total number of images constant according to amount；
(2) objective indicator thresholding is determined, to the initial carrier subimage in step (1) by given compression ratio compression, the objective indicator of the subimage before calculating the subimage after decompression recovers and compressing, carry out functional transformation less than the subimage of objective indicator thresholding, obtain new subimage and enter step (3)；It is directly entered step (4) higher than the initial carrier subimage of objective indicator thresholding；
(3) the new subimage obtained in step (2) is carried out the compression of compression ratio as step (2), the subimage that decompression recovers is carried out the inverse transformation of functional transformation in step (2), subimage after calculation reverse transformation and the objective indicator of initial carrier subimage, if objective indicator is higher than the objective indicator before functional transformation in step (2), then utilize and step (2) obtains new subimage replace initial carrier subimage to be compressed transmission, and enter step (4)；If objective indicator is less than or equal to the objective indicator before functional transformation in step (2), the initial carrier subimage compression being less than objective indicator thresholding in step (2) is the most still utilized to be transferred into step (4)
(4) the new subimage after the functional transformation obtained in initial carrier subimage and the step (3) less than objective indicator thresholding higher than objective indicator thresholding and part obtained step (2) synthesizes, and the transformation parameter using image watermark method to embed the functional transformation described in watermark and step (2) wherein is formed and contains watermarking images；
(5) watermarking images will be contained and be compressed transmission；
(6) data of compression decompress acquisition containing watermark image data in receiving terminal receiving step (5), watermark and functional transformation parameter is gone out in the extracting data containing watermarking images, obtain the new subimage after initial carrier subimage and functional transformation, and the new subimage after this functional transformation is carried out function inverse transformation, obtain the subimage before functional transformation；
(7) subimage before functional transformation in step (6) and initial carrier subimage are synthesized, obtain initial carrier image.
The concrete form carrying out functional transformation less than the subimage of criteria thresholds is by described step (2) following three function any one:
A) Y=Y1*LOG10(1+X), 0≤Y≤Ymax；
B) Y=Y2*Sqrt (X^p), 0≤Y≤Ymax；
c)Y=Y3/[1+exp(-X)],0≤Y≤Ymax。
Wherein X represents the pixel value of original image, Y represents the pixel value of the image after functional transformation, Ymax is the maximum that the pixel value Y after conversion allows, and is adjusted the span of the Y value after conversion by parameter Y1, Y2, Y3, p, and wherein Y1, Y2, Y3, p are the real number more than 0.
In described step (2), objective indicator thresholding is configured according to compatible index, when objective indicator thresholding is set to 0, then this method uses original sub image to be directly compressed, and when criteria thresholds is set to infinity, then this method uses functional transformation to be compressed completely.
Described step (6) carries out function contravariant and is changed in step (3) inverse function of function used.
Objective indicator in described step (2) refers to PSNR.
Image watermark in described step (4) refers to the data such as the copyright information of image, compression of images parameter, shooting time and spot for photography；Image watermark method in described step (4) can also correctly extract watermark through compression of images, decompression and can correctly recover digital watermark method or the information concealing method of image after referring to watermark embedding image.
The present invention compared with prior art provides the benefit that:
(1) present invention setting by criteria thresholds, subimage ungratified to index is compressed transmission after carrying out selectivity conversion, it is ensured that the quality of the image recovered after compression of images.
(2) first initial carrier image is decomposed by the present invention, select partial subgraph picture to carry out functional transformation, it is to avoid big image carries out the complexity of data process；Selecting partial subgraph as carrying out watermark embedding by picture breakdown simultaneously, save hidden capacity, only partial subgraph picture embedded in information, so ensure that the quality of image.
(3) functional transformation that present invention utilizes original sub image changes subimage characteristic, in piece image, the region that texture is complicated, image pixel excursion is big often leads to image and is difficult to compress, these regions are carried out functional transformation by the present invention, pixel value is transformed to more squeezable space, more preferable Quality of recovery can be obtained, it is to avoid the limitation that original method image Quality of recovery is bad under identical compression ratio.
(4) present invention can use different functions to carry out greyscale transformation, and function computing formula parameter is embedded in subimage by robust steganography method, after data compression, information is not lost, thus ensure that data compression quality, the present invention carries out being suitable for during functional transformation multiple function simultaneously, versatility is relatively strong, has extraordinary compatibility.
(5) present invention cannot directly obtain complete image in transmittance process, enhances the disguise of the data transmission of subimage, improves the safety of data transmission.
(6) present invention has higher recovery picture quality under same compression ratio, or under recovering picture quality certain condition, has bigger compression ratio.Simultaneously the method have break the whole up into parts, single subimage treating capacity is little, complexity is low, it is few to realize resource occupation, compression effectiveness waits well practical feature, thus has more practical value in spacecraft engineering.
(7) present invention can work in different states by setting target thresholding, can be according to the feature selective goal thresholding of input original image, when whole image smoothing, setting target thresholding is 0, when, pixel change complicated for entire image texture is violent, criteria thresholds is set to a value greatly, each subimage of entire image is made to be in " below standard " state, not only smooth content is existed but also there is the pixel violent content of change for image, a suitable criteria thresholds numerical value can be set, to obtain better image Quality of recovery.
(8) present invention is not in the case of affecting compression of images Quality of recovery, not increasing transmitted data amount, the data such as the relevant information of image such as copyright information, compression of images parameter, shooting time and spot for photography can be embedded in image transmission, improve the efficiency of image transmitting, the application for image is provided convenience.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is further described in detail.
The present invention utilizes the technology such as picture breakdown, setting target thresholding, image watermark, and subimage the most up to standard for PSNR carries out functional transformation, and is transmitted in image after watermark and transforming function transformation function are embedded into conversion.Receiving terminal can correctly extract watermark and transforming function transformation function from image, carries out inverse transformation and recovers raw image data.In the case of not affecting compression of images Quality of recovery, not increasing image data amount, it is provided that the method for compressing image that a kind of compression performance is the most superior, hence it is evident that improve the compression effectiveness of available data compression method.The method utilizing the present invention also defines protection to original image so that others can only directly obtain partial subgraph picture, it is impossible to directly obtain complete image, enhances the disguise of the data transmission of some subimages, improves the safety of data transmission.
As it is shown in figure 1, step of the present invention is as follows:
(1) being several initial carrier subimages by initial carrier picture breakdown, several initial carrier subimages described are the nonoverlapping piecemeal of original image, keep total number of images constant according to amount；
(2) objective indicator thresholding is determined, to the initial carrier subimage in step (1) by given compression ratio compression, the objective indicator (objective indicator refers to PSNR) of the subimage before calculating the subimage after decompression recovers and compressing, carry out functional transformation less than the subimage of objective indicator thresholding, obtain new subimage and enter step (3)；It is directly entered step (4) higher than the initial carrier subimage of objective indicator thresholding；Objective indicator thresholding is configured according to compatible index, when objective indicator thresholding is set to 0, then this method uses original sub image to be directly compressed, when criteria thresholds is set to infinity, then this method uses functional transformation to be compressed completely, and the situation of remaining criteria thresholds is the general work state of the present invention.
(3) the new subimage obtained in step (2) is carried out the compression of compression ratio as step (2), the subimage that decompression recovers is carried out the inverse transformation of functional transformation in step (2), subimage after calculation reverse transformation and the objective indicator of initial carrier subimage, if objective indicator is higher than the objective indicator before functional transformation in step (2), then utilize and step (2) obtains new subimage replace initial carrier subimage to be compressed transmission, and enter step (4)；If objective indicator is less than or equal to the objective indicator before functional transformation in step (2), the compression of the initial carrier subimage in step (2) is the most still utilized to be transferred into step (4)；Such as to through judging that the objective indicator of the new subimage of part in step (2) is above the objective indicator before image converts, so replacing initial carrier image to be compressed transmission with regard to the new subimage of this part, remaining residue subimage still selects initial carrier subimage to be transmitted；
(4) obtain step (2) (partly refers to, less than the initial carrier subimage of objective indicator thresholding, the initial carrier subimage that in step (3), after functional transformation, objective indicator is the most up to standard higher than objective indicator thresholding and part less than the initial carrier subimage of objective indicator thresholding, this situation is compressed transmission still with the initial carrier subimage before these functional transformations) synthesize with the new subimage after the functional transformation that obtains in step (3), the transformation parameter using image watermark method to embed the functional transformation described in watermark and step (2) wherein is formed and contains watermarking images；
(5) watermarking images will be contained and be compressed transmission；
(6) data of compression decompress acquisition containing watermark image data in receiving terminal receiving step (5), watermark and functional transformation parameter is gone out in the extracting data containing watermarking images, obtain the new subimage after initial carrier subimage and functional transformation, and the new subimage after this functional transformation is carried out function inverse transformation, obtain the subimage before functional transformation；
(7) subimage before functional transformation in step (6) and initial carrier subimage are synthesized, obtain initial carrier image.
The concrete form carrying out functional transformation less than the subimage of criteria thresholds is by described step (2) following three function any one:
A) Y=Y1*LOG10(1+X), 0≤Y≤Ymax；
B) Y=Y2*Sqrt (X^p), 0≤Y≤Ymax；
c)Y=Y3/[1+exp(-X)],0≤Y≤Ymax。
Wherein X represents the pixel value of original image, Y represents the pixel value of the image after functional transformation, Ymax is the maximum that the pixel value Y after conversion allows, and is adjusted the span of the Y value after conversion by parameter Y1, Y2, Y3, p, and wherein Y1, Y2, Y3, p are the real number more than 0.
Image watermark in described step (4) refers to the data such as the copyright information of image, compression of images parameter, shooting time and spot for photography；Image watermark method in described step (4) can also correctly extract watermark through compression of images, decompression and can correctly recover digital watermark method or the information concealing method of image after referring to watermark embedding image.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (6)
1. a data compression transmission method based on image conversion with image watermark, it is characterised in that step is as follows:
(1) being several initial carrier subimages by initial carrier picture breakdown, several initial carrier subimages described are the nonoverlapping piecemeal of original image, keep total number of images constant according to amount；
(2) objective indicator thresholding is determined, to the initial carrier subimage in step (1) by given compression ratio compression, the objective indicator of the subimage before calculating the subimage after decompression recovers and compressing, carry out functional transformation less than the subimage of objective indicator thresholding, obtain new subimage and enter step (3)；It is directly entered step (4) higher than the initial carrier subimage of objective indicator thresholding；
(3) the new subimage obtained in step (2) is carried out the compression of compression ratio as step (2), the subimage that decompression recovers is carried out the inverse transformation of functional transformation in step (2), subimage after calculation reverse transformation and the objective indicator of initial carrier subimage, if objective indicator is higher than the objective indicator before functional transformation in step (2), then utilize and step (2) obtains new subimage replace initial carrier subimage to be compressed transmission, and enter step (4)；If objective indicator is less than or equal to the objective indicator before functional transformation in step (2), the most still utilizes in step (2) and be compressed transmission less than the initial carrier subimage of objective indicator thresholding, and enter step (4)；
(4) the new subimage after the functional transformation obtained in the initial carrier subimage the most up to standard higher than objective indicator after functional transformation in objective indicator thresholding and step (3) obtained step (2) and step (3) synthesizes, and the transformation parameter using image watermark method to embed the functional transformation described in watermark and step (2) wherein is formed containing watermarking images；
(5) watermarking images will be contained and be compressed transmission；
(6) data of compression decompress acquisition containing watermark image data in receiving terminal receiving step (5), watermark and functional transformation parameter is gone out in the extracting data containing watermarking images, obtain the new subimage after initial carrier subimage and functional transformation, and the new subimage after this functional transformation is carried out function inverse transformation, obtain the subimage before functional transformation；
(7) subimage before functional transformation in step (6) and initial carrier subimage are synthesized, obtain initial carrier image.
The most according to claim 1 a kind of based on image conversion and the data compression transmission method of image watermark, it is characterised in that: the concrete form carrying out functional transformation less than the subimage of criteria thresholds is by described step (2) following three function any one:
A) Y=Y1*LOG10 (1+X), 0≤Y≤Ymax；
B) Y=Y2*Sqrt (X^p), 0≤Y≤Ymax；
C) Y=Y3/ [1+exp (-X)], 0≤Y≤Ymax；
Wherein X represents the pixel value of original image, Y represents the pixel value of the image after functional transformation, Ymax is the maximum that the pixel value Y after conversion allows, and is adjusted the span of the Y value after conversion by parameter Y1, Y2, Y3, p, and wherein Y1, Y2, Y3, p are the real number more than 0.
The most according to claim 1 a kind of based on image conversion and the data compression transmission method of image watermark, it is characterized in that: in described step (2), objective indicator thresholding is configured according to compatible index, when objective indicator thresholding is set to 0, then this method uses original sub image to be directly compressed, when criteria thresholds is set to infinity, then this method uses functional transformation to be compressed completely.
It is the most according to claim 1 a kind of based on image conversion and the data compression transmission method of image watermark, it is characterised in that: described step (6) carries out function contravariant and is changed in step (3) inverse function of function used.
It is the most according to claim 1 a kind of based on image conversion and the data compression transmission method of image watermark, it is characterised in that: the objective indicator in described step (2) refers to PSNR.
It is the most according to claim 1 a kind of based on image conversion and the data compression transmission method of image watermark, it is characterised in that: the image watermark in described step (4) refers to all data of the copyright information of image, compression of images parameter, shooting time and spot for photography；Image watermark method in described step (4) can also correctly extract watermark through compression of images, decompression and can correctly recover digital watermark method or the information concealing method of image after referring to watermark embedding image.
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| JP5029560B2 (en) * | 2008-10-01 | 2012-09-19 | コニカミノルタビジネステクノロジーズ株式会社 | Image processing apparatus, compression method and decompression method |
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| US5467413A (en) * | 1993-05-20 | 1995-11-14 | Radius Inc. | Method and apparatus for vector quantization for real-time playback on low cost personal computers |
| CN101267557A (en) * | 2008-04-14 | 2008-09-17 | 西安理工大学 | A method for image compression based on compound vector quantification |
| CN101478693A (en) * | 2008-12-31 | 2009-07-08 | 中国资源卫星应用中心 | Method for evaluating star-loaded optical remote sensing image compression quality |
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