CN103139522A - Processing method of multi-visual image - Google Patents

Processing method of multi-visual image Download PDF

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CN103139522A
CN103139522A CN2013100222341A CN201310022234A CN103139522A CN 103139522 A CN103139522 A CN 103139522A CN 2013100222341 A CN2013100222341 A CN 2013100222341A CN 201310022234 A CN201310022234 A CN 201310022234A CN 103139522 A CN103139522 A CN 103139522A
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color
source images
watermark
embedded
image
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CN103139522B (en
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邵枫
蒋刚毅
郁梅
李福翠
彭宗举
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Anhui Hot Air Balloon Culture Communication Co ltd
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Ningbo University
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Abstract

The invention discloses a processing method of a multi-visual image. Firstly, building a color mapping relation of a source image and a target image by the adoption of a histogram matching method, and inserting a watermark image which is to be inserted into the source image according to gamma correction to obtain the source image inserted with watermark; carrying out coding transmission on the source image inserted with the watermark and the target image, and designing two methods which are color correction and copyright protection to process the source image inserted with the watermark after decoding. By the adoption of processing method, the accuracy of the color correction of the multi-visual image is guaranteed, simultaneously, the copyright protection of the multi-visual image can be effectively protected, and effectiveness of a multi-visual video system is improved.

Description

A kind of processing method of multi-view image
Technical field
The present invention relates to a kind of processing method of image, especially relate to a kind of processing method of multi-view image.
Background technology
In recent years, fast development along with network and information technology, make the digital medium information such as digital picture, Voice ﹠ Video and works directly to obtain and wide-scale distribution by digitized form, simultaneously also make the bootlegger can copy easily or spreading digital multimedia messages and works, thereby cause copyright work in the situation that unauthorizedly extensively copied and propagate, the original author's that constituted a serious infringement legitimate rights and interests.Therefore, must take effective copyright protection measure to prevent bootlegging and the propagation of digital medium information and works.Digital watermarking is the effective ways of realizing copyright protection, and the features such as invisibility, robustness, fail safe are to estimate the important indicator of digital watermark method, and the research of existing digital watermark method mainly concentrates on two-dimensional video image.
In 3 D video is used, be also very important to the copyright protection of multi-view point video content.Concerning the copyright owner of 3 d video content, it not only has the copyright of the multi-view point video content of acquired original, and it is protected by copyright too to generate according to original multi-view point video other visual point images that obtain.Therefore, should be different from the copyright protection of existing two-dimensional video image to the copyright protection of multi-view image, this be because: on the one hand, after each operations such as multi-view image process color correction, virtual viewpoint rendering, how to guarantee still can extract efficient watermark information the multi-view image after processing, the robustness that improves watermark is a problem of needing solution badly; On the other hand, how to the multi-view image embed watermark information, making the watermark information of embedding not be subjected to the impact of various processing, and how accurately to detect watermark information from color correction, is all to need the problem researched and solved in the processing procedure of multi-view image.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of processing method of multi-view image, and it can accurately realize consistency of colour between viewpoint, and need not with reference to original visual point image when extracting watermark.
The present invention solves the problems of the technologies described above the technical scheme that adopts: a kind of processing method of multi-view image is characterized in that its processing procedure is: at first, adopt histogram matching to set up the color map relation of target image and source images; Secondly, the function representation form according to Gamma correction is embedded into watermarking images to be embedded in source images, obtains being embedded with the source images of watermark; Then, adopt the multiple view video coding device to carry out coding transmission to target image and the source images that is embedded with watermark, the source images that is embedded with watermark after target image after user side is to coding and coding is decoded, and obtains decoded target image and the decoded source images that is embedded with watermark; At last; each color component to each pixel in the decoded source images that is embedded with watermark carries out color correction; obtain the decoded correcting image of source images after color correction that is embedded with watermark; or extract the watermark image from the decoded source images that is embedded with watermark, whether protected by copyrightly then determine to be embedded with the source images of watermark according to the watermark image.
The processing method of above-mentioned a kind of multi-view image, it specifically comprises the following steps:
1. synchronization is defined as target image by a visual point image in the multi-view image of the parallel camera system shooting of many viewpoints, be designated as (T)I i(x 1, y 1), and other visual point image is defined as source images, be designated as (S)I i(x 1, y 1), wherein, i=1,2,3 represent respectively luminance component Y, the first chromatic component U and the second chromatic component V in three color components of YUV color space, (x 1, y 1) coordinate position of pixel in expression target image and source images, 1≤x 1≤ W, 1≤y 1≤ H, W represent the width of target image and source images, and H represents the height of target image and source images, (T)I i(x 1, y 1) expression (T)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel, (S)I i(x 1, y 1) expression (S)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel;
2. adopt histogram matching, set up target image (T)T i(x 1, y 1) in each color value and source images (S)I i(x 1, y 1) in the color map relation of corresponding color value, be designated as q=f i(p), wherein, f iThe function representation form of color map relation of i color component of () expression, p represent source images (S)I i(x 1, y 1) in color value, q represent source images (S)I i(x 1, y 1) in the color value of color value after color correction, 0≤p≤255,0≤q≤255;
3. according to the function representation form r=α * p of Gamma correction β, with watermarking images to be embedded { P (x 2, y 2) be embedded into source images (S)I i(x 1, y 1) in, obtain being embedded with the source images of watermark, be designated as
Figure BDA00002755078600021
Wherein, α and β be for controlling parameter, p represent source images (S)I i(x 1, y 1) in color value, r represent source images (S)I i(x 1, y 1) in the color value of color value after Gamma correction, 0≤p≤255,0≤r≤255,
Figure BDA00002755078600022
Expression is embedded with the source images of watermark
Figure BDA00002755078600023
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel, (x 2, y 2) expression watermarking images { P (x to be embedded 2, y 2) in the coordinate position of pixel, 1≤x 2≤ N, 1≤y 2≤ N, N represent watermarking images to be embedded { P (x 2, y 2) the horizontal and vertical size, P (x 2, y 2) expression watermarking images { P (x to be embedded 2, y 2) in coordinate position be (x 2, y 2) the watermark information of pixel;
4. adopt the multiple view video coding device to target image (T)I i(x 1, y 1) and be embedded with the source images of watermark
Figure BDA00002755078600031
Carry out coding transmission, the source images that is embedded with watermark after the target image after user side is to coding and coding is decoded, and obtains decoded target image and the decoded source images that is embedded with watermark, and correspondence is designated as respectively
Figure BDA00002755078600032
With
Figure BDA00002755078600033
Wherein,
Figure BDA00002755078600034
Represent decoded target image
Figure BDA00002755078600035
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel,
Figure BDA00002755078600036
Represent the decoded source images that is embedded with watermark
Figure BDA00002755078600037
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel;
5. in different ways to the decoded source images that is embedded with watermark Process, if select the color correction mode, execution in step 6., if select the copyright protection pattern, execution in step is 7.;
6. according to q=f i(p), to the decoded source images that is embedded with watermark In each color component of each pixel carry out color correction, obtain
Figure BDA000027550786000310
Correcting image after color correction, be designated as (C)I i(x 1, y 1), will (C)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel be designated as (C)I i(x 1, y 1),
Figure BDA000027550786000311
7. according to r=α * p β, from the decoded source images that is embedded with watermark
Figure BDA000027550786000312
In extract the watermark image, be designated as (Q)I i(x 1, y 1), will (Q)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel be designated as (Q)I i(x 1, y 1),
Figure BDA000027550786000313
Then judge whether can from the watermark image (Q)I i(x 1, y 1) in observe the watermarking images { P (x of embedding 2, y 2) in the watermark information of each pixel, if can, determine to be embedded with the source images of watermark
Figure BDA000027550786000314
Protected by copyright, otherwise, determine to be embedded with the source images of watermark
Figure BDA000027550786000315
Not protected by copyright.
Described step detailed process 2. is:
2.-1, calculate target image (T)I i(x 1, y 1) the histogram of i color component, be designated as (T)H i(k) | 0≤k≤255}, then calculate (T)H i(k) | the accumulation histogram of 0≤k≤255}, be designated as (T)C i(k) | 0≤k≤255},
Figure BDA00002755078600041
Wherein, (T)H i(k) expression target image (T)I i(x 1, y 1) the color value of i color component be the number of all pixels of k, (T)H i(j) expression target image (T)I i(x 1, y 1) the color value of i color component be the number of all pixels of j, (T)C i(k) expression target image (T)I i(x 1, y 1) the color value of i color component be not more than the accumulative total number of all pixels of k;
2.-2, calculate source images (S)I i(x 1, y 1) the histogram of i color component, be designated as (S)H i(k) | 0≤k≤255}, then calculate (S)H i(k) | the accumulation histogram of 0≤k≤255}, be designated as (S)C i(k) | 0≤k≤255}, Wherein, (S)H i(k) expression source images (S)I i(x 1, y 1) the color value of i color component be the number of all pixels of k, (S)H i(j) expression source images (S)I i(x 1, y 1) the color value of i color component be the number of all pixels of j, (S)C i(k) expression source images (S)I i(x 1, y 1) the color value of i color component be not more than the accumulative total number of all pixels of k;
2.-3, get source images (S)I i(x 1, y 1) the color value of i color component be not more than p 0The accumulative total number of all pixels (S)C i(p 0), then calculate (S)C i(p 0) and target image (T)I i(x 1, y 1) the color value of i color component be not more than the accumulative total number of all pixels of q (T)C i(q) distance between is designated as (S)C i(p 0)- (T)C i(q) |, then basis (S)C i(p 0)- (T)C i(q) | obtain source images (S)I i(x 1, y 1) in color value p 0With target image (T)I i(x 1, y 1) in color value q 0The color map relation, be designated as q 0=f i(p 0),
Figure BDA00002755078600043
Wherein, 0≤p 0≤ 255,0≤q 0≤ 255,0≤q≤255, " || " is the symbol that takes absolute value,
Figure BDA00002755078600044
Expression makes (S)C i(p 0)- (T)C i(q) | the q value of value minimum;
2.-4, choose 255 and p 0Different color value is designated as respectively p 1, p 2..., p j′..., p 255, then according to the operating process of step 2.-3, obtain respectively in an identical manner source images (S)I i(x 1, y 1) in color value p 1, p 2..., p j′..., p 255With target image (T)I i(x 1, y 1) in color value q 1, q 2..., q j,, q 255Color map relation one to one, correspondence is designated as q respectively 1=f i(p 1), q 2=f i(p 2) ..., q j′=f i(p j′) ..., q 255=f i(p 255),
Figure BDA00002755078600052
Figure BDA00002755078600053
Figure BDA00002755078600054
Wherein, 1≤j'≤255,0≤q≤255,0≤p 1, p 2..., p j'..., p 255≤ 255,0≤q 1, q 2..., q j′..., q 255≤ 255, q 1, q 2..., q j′..., q 255Value and q 0Value different, (S)C i(p 1) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p 1The accumulative total number of all pixels, (S)C i(p 2) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p 2The accumulative total number of all pixels, (S)C i(p j′) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p j'The accumulative total number of all pixels, (S)C i(p 255) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p 255The accumulative total number of all pixels.
Described step detailed process 3. is:
3.-1, according to r=α * p β, obtain watermarked optimum density value, be designated as p *,
Figure BDA00002755078600055
Wherein,
Figure BDA00002755078600056
For getting gradient function,
Figure BDA00002755078600057
Expression makes
Figure BDA00002755078600058
Maximum p value;
3.-2, according to watermarked optimum density value p *, obtain source images (S)I i(x 1, y 1) in watermarked original position, be designated as
Figure BDA000027550786000510
Wherein,
Figure BDA000027550786000511
1≤x 0≤ W-N+1,1≤y 0≤ H-N+1, (S)I i(x 1, y 1) the expression source images (S)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of the 1st color component of pixel, " || " is the symbol that takes absolute value,
Figure BDA000027550786000513
Expression makes
Figure BDA000027550786000514
Maximum (x 0, y 0);
3.-3, with source images (S)I i(x 1, y 1) in abscissa exist
Figure BDA000027550786000515
In interval and ordinate exist
Figure BDA000027550786000516
The current pixel of processing in interval is defined as current pixel point;
3. the coordinate position of-4, supposing current pixel point is (x 1', y 1'), then judge watermarking images to be embedded { P (x 2, y 2) in coordinate position be
Figure BDA00002755078600061
The watermark information of pixel whether be 1, if so, revise the color value of the 1st color component of current pixel point, the color value of the 1st color component of amended current pixel point is designated as
Figure BDA00002755078600062
Figure BDA00002755078600063
Otherwise, directly with the color value of the 1st color component of the current pixel point color value as the 1st color component of amended current pixel point, the color value of the 1st color component of amended current pixel point is designated as
Figure BDA00002755078600064
Wherein, x 1 * ≤ x 1 ′ ≤ x 1 * + N - 1 , y 1 * ≤ y 1 ′ ≤ y 1 * + N - 1 , (S)I i(x 1', y 1') the expression source images (S)I i(x 1, y 1) in coordinate position be (x 1', y 1') the color value of the 1st color component of pixel, Δ is intensity factor;
3.-5, with source images (S)I i(x 1, y 1) in abscissa exist
Figure BDA00002755078600068
In interval and ordinate exist
Figure BDA00002755078600069
Then next pending pixel in interval returns to step 3.-4 and continues to carry out as current pixel point, until source images (S)I i(x 1, y 1) in abscissa exist
Figure BDA000027550786000610
In interval and ordinate exist
Figure BDA000027550786000611
All pixels in interval are disposed, and obtain being embedded with the source images of watermark, are designated as Wherein,
Figure BDA000027550786000613
Expression is embedded with the source images of watermark
Figure BDA000027550786000614
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel.
Described step is got α=1, β=0.2 in 3..
Get Δ=3 in described step 3.-3.
Compared with prior art, the invention has the advantages that:
1) the inventive method reaches the purpose of color correction and copyright protection by the color map relation that changes source images and target image; adopt histogram matching to realize accurate color correction; make solid colour between viewpoint; and adopt Gamma correction to strengthen the watermark strength of embedding; its watermark embedding and extracting method are very simple; and need not when extracting watermark with reference to original visual point image, can be effectively applied in various multi-view video systems.
2) the inventive method has designed color correction and the copyright protection dual mode is processed the decoded source images that is embedded with watermark; like this when guaranteeing multi-view image color correction accuracy; can effectively protect the copyright information of multi-view image, improve the validity of multi-view video system.
Description of drawings
Fig. 1 is the FB(flow block) of the inventive method;
Fig. 2 a is the target image of " flamenco1 " many viewpoints test set;
Fig. 2 b is the source images of " flamenco1 " many viewpoints test set;
Fig. 2 c is the target image of " objects2 " many viewpoints test set;
Fig. 2 d is the source images of " objects2 " many viewpoints test set;
Fig. 3 a " University Of Ningbo " watermarking images for embedding;
Fig. 3 b " Information Institute " watermarking images for embedding;
Fig. 3 c " image processing " watermarking images for embedding;
Fig. 3 d " electronic information " watermarking images for embedding;
Fig. 3 e " one two three four " watermarking images for embedding;
Fig. 4 a is the color correction image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 a obtains through the inventive method;
Fig. 4 b is the watermark image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 a obtains through the inventive method;
Fig. 4 c is the color correction image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 a obtains through the inventive method;
Fig. 4 d is the watermark image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 a obtains through the inventive method;
Fig. 5 a is the color correction image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 b obtains through the inventive method;
Fig. 5 b is the watermark image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 b obtains through the inventive method;
Fig. 5 c is the color correction image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 b obtains through the inventive method;
Fig. 5 d is the watermark image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 b obtains through the inventive method;
Fig. 6 a is the color correction image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 c obtains through the inventive method;
Fig. 6 b is the watermark image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 c obtains through the inventive method;
Fig. 6 c is the color correction image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 c obtains through the inventive method;
Fig. 6 d is the watermark image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 c obtains through the inventive method;
Fig. 7 a is the color correction image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 d obtains through the inventive method;
Fig. 7 b is the watermark image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 d obtains through the inventive method;
Fig. 7 c is the color correction image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 d obtains through the inventive method;
Fig. 7 d is the watermark image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 d obtains through the inventive method;
Fig. 8 a is the color correction image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 e obtains through the inventive method;
Fig. 8 b is the watermark image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 e obtains through the inventive method;
Fig. 8 c is the color correction image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 e obtains through the inventive method;
Fig. 8 d is the watermark image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 e obtains through the inventive method.
Embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
The processing method of a kind of multi-view image that the present invention proposes, its flow process as shown in Figure 1, its processing procedure is: at first, adopt histogram matching to set up the color map relation of target image and source images; Secondly, the function representation form according to Gamma correction is embedded into watermarking images to be embedded in source images, obtains being embedded with the source images of watermark; Then, adopt the multiple view video coding device to carry out coding transmission to target image and the source images that is embedded with watermark, the source images that is embedded with watermark after target image after user side is to coding and coding is decoded, and obtains decoded target image and the decoded source images that is embedded with watermark; At last; each color component to each pixel in the decoded source images that is embedded with watermark carries out color correction; obtain the decoded correcting image of source images after color correction that is embedded with watermark; or extract the watermark image from the decoded source images that is embedded with watermark, whether protected by copyrightly then determine to be embedded with the source images of watermark according to the watermark image.
The processing method of multi-view image of the present invention, it specifically comprises the following steps:
1. synchronization is defined as target image by a visual point image in the multi-view image of the parallel camera system shooting of many viewpoints, be designated as (T)I i(x 1, y 1), and other visual point image is defined as source images, be designated as (S)I i(x 1, y 1), wherein, i=1,2,3 represent respectively luminance component Y, the first chromatic component U and the second chromatic component V in three color components of YUV color space, (x 1, y 1) coordinate position of pixel in expression target image and source images, 1≤x 1≤ W, 1≤y 1≤ H, W represent the width of target image and source images, and H represents the height of target image and source images, (T)I i(x 1, y 1) expression (T)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel, (S)I i(x 1, y 1) expression (S)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel.
In the present embodiment, adopt multi-view point video test set " flamencol " that Japanese KDDI company provides and " objects2 " as original multi-viewpoint video image.Fig. 2 a and Fig. 2 b are respectively target image and the source images of " flamenco1 " many viewpoints test set, and Fig. 2 c and Fig. 2 d are respectively target image and the source images of " objects2 " many viewpoints test set, and the size of target image and source images is 320 * 240.Can find out from Fig. 2 a, Fig. 2 b, Fig. 2 c and Fig. 2 d, the color appearance of target image and source images is obviously inconsistent, and therefore it is carried out color correction just seems very necessary.
2. can reflect the Distribution Statistics information of color of image due to histogram, so the present invention adopts histogram matching, set up target image (T)I i(x 1, y 1) in each color value and source images (S)I i(x 1, y 1) in the color map relation of corresponding color value, be designated as q=f i(p), wherein, f iThe function representation form of color map relation of i color component of () expression, p represent source images (S)I i(x 1, y 1) in color value, q represent source images (S)I i(x 1, y 1) in the color value of color value after color correction, i.e. target image corresponding to expression (T)I i(x 1, y 1) in color value, 0≤p≤255,0≤q≤255.
In this specific embodiment, step detailed process 2. is:
2.-1, calculate target image (T)I i(x 1, y 1) the histogram of i color component, be designated as (T)H i(k) | 0≤k≤255}, then calculate (T)H i(k) | the accumulation histogram of 0≤k≤255}, be designated as (T)C i(k) | 0≤k≤255},
Figure BDA00002755078600091
Wherein, (T)H i(k) expression target image (T)I i(x 1, y 1) the color value of i color component be the number of all pixels of k, (T)H i(j) expression target image (T)I i(x 1, y 1) the color value of i color component be the number of all pixels of j, (T)C i(k) expression target image (T)I i(x 1, y 1) the color value of i color component be not more than the accumulative total number of all pixels of k.
2.-2, calculate source images (S)I i(x 1, y 1) the histogram of i color component, be designated as (S)H i(k) | 0≤k≤255}, then calculate (S)H i(k) | the accumulation histogram of 0≤k≤255}, be designated as (S)C i(k) | 0≤k≤255},
Figure BDA00002755078600101
Wherein, (S)H i(k) expression source images (S)I i(x 1, y 1) the color value of i color component be the number of all pixels of k, (S)H i(j) expression source images (S)I i(x 1, y 1) the color value of i color component be the number of all pixels of j, (S)C i(k) expression source images (S)I i(x 1, y 1) the color value of i color component be not more than the accumulative total number of all pixels of k.
2.-3, get source images (S)I i(x 1, y 1) the color value of i color component be not more than p 0The accumulative total number of all pixels (S)C i(p 0), then calculate (S)C i(p 0) and target image (T)I i(x 1, y 1) the color value of i color component be not more than the accumulative total number of all pixels of q (T)C i(q) distance between is designated as (S)C i(p 0)- (T)C i(q) |, then basis (S)C i(p 0)- (T)C i(q) | obtain source images (S)I i(x 1, y 1) in color value p 0With target image (T)I i(x 1, y 1) in color value q 0The color map relation, be designated as q 0=f i(p 0),
Figure BDA00002755078600102
Wherein, 0≤p 0≤ 255,0≤q 0≤ 255,0≤q≤255, " || " is the symbol that takes absolute value,
Figure BDA00002755078600103
Expression makes (S)C i(p 0)- (T)C i(q) | the q value of value minimum.
2.-4, choose 255 and p 0Different color value is designated as respectively p 1, p 2..., p j′..., p 255, then according to the operating process of step 2.-3, obtain respectively in an identical manner source images (S)I i(x 1, y 1) in color value p 1, p 2..., p j′..., p 255With target image (T)I i(x 1, y 1) in color value q 1, q 2..., q j′..., q 255Color map relation one to one, correspondence is designated as q respectively 1=f i(p 1), q 2=f i(p 2) ..., q j′=f i(p j′) ..., q 255=f i(p 255),
Figure BDA00002755078600104
Figure BDA00002755078600105
Figure BDA00002755078600106
Figure BDA00002755078600107
Wherein, 1≤j'≤255,0≤q≤255,0≤p 1, p 2..., p j'..., p 255≤ 255,0≤q 1, q 2..., q j′..., q 255≤ 255, q 1, q 2..., q j′..., q 255Value and q 0Value different, (S)C i(p 1) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p 1The accumulative total number of all pixels, (S)C i(p 2) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p 2The accumulative total number of all pixels, (S)C i(p j′) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p j'The accumulative total number of all pixels, (S)C i(p 255) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p 255The accumulative total number of all pixels.
3. because Gamma correction can expand to less misalignment in larger color gamut, so the present invention is according to the function representation form r=α * p of Gamma correction β, with watermarking images to be embedded { P (x 2, y 2) be embedded into source images (S)I i(x 1, y 1) in, obtain being embedded with the source images of watermark, be designated as
Figure BDA00002755078600111
Wherein, α and β in the present embodiment, get α=1, β=0.2 for controlling parameter, p represent source images (S)I i(x 1, y 1) in color value, r represent source images (S)I i(x 1, y 1) in the color value of color value after Gamma correction, 0≤p≤255,0≤r≤255,
Figure BDA00002755078600112
Expression is embedded with the source images of watermark
Figure BDA00002755078600113
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel, (x 2, y 2) expression watermarking images { P (x to be embedded 2, y 2) in the coordinate position of pixel, 1≤x 2≤ N, 1≤y 2≤ N, N represent watermarking images to be embedded { P (x 2, y 2) the horizontal and vertical size, P (x 2, y 2) expression watermarking images { P (x to be embedded 2, y 2) in coordinate position be (x 2, y 2) the watermark information of pixel.
In this specific embodiment, step detailed process 3. is:
3.-1, according to r=α * p β, obtain watermarked optimum density value, be designated as p *,
Figure BDA00002755078600114
Wherein,
Figure BDA00002755078600115
For getting gradient function,
Figure BDA00002755078600116
Expression makes
Figure BDA00002755078600117
Maximum p value.
3.-2, according to watermarked optimum density value p *, obtain source images (S)I i(x 1, y 1) in watermarked original position, be designated as
Figure BDA00002755078600118
Figure BDA00002755078600119
Wherein,
Figure BDA000027550786001110
Figure BDA000027550786001111
1≤x 0≤ W-N+1,1≤y 0≤ H-N+1, (S)I i(x 1, y 1) the expression source images (S)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of the 1st color component of pixel, " || " is the symbol that takes absolute value,
Figure BDA00002755078600121
Expression makes
Figure BDA00002755078600122
Maximum (x 0, y 0).
3.-3, with source images (S)I i(x 1, y 1) in from original position
Figure BDA00002755078600123
Beginning, abscissa exists
Figure BDA00002755078600124
In interval and ordinate exist
Figure BDA00002755078600125
The current pixel of processing in interval is defined as current pixel point.
3. the coordinate position of-4, supposing current pixel point is (x 1', y 1'), then judge watermarking images to be embedded { P (x 2, y 2) in coordinate position be
Figure BDA00002755078600126
The watermark information of pixel whether be 1, if so, revise the color value of the 1st color component of current pixel point, the color value of the 1st color component of amended current pixel point is designated as
Figure BDA00002755078600127
Figure BDA00002755078600128
Otherwise, directly with the color value of the 1st color component of the current pixel point color value as the 1st color component of amended current pixel point, the color value of the 1st color component of amended current pixel point is designated as
Figure BDA00002755078600129
Figure BDA000027550786001210
Wherein, x 1 * ≤ x 1 ′ ≤ x 1 * + N - 1 , y 1 * ≤ y 1 ′ ≤ y 1 * + N - 1 , (S)I i(x 1', y 1') the expression source images (S)I i(x 1, y 1) in coordinate position be (x 1', y 1') the color value of the 1st color component of pixel, Δ is intensity factor, in the present embodiment, gets Δ=3.
3.-5, with source images (S)I i(x 1, y 1) in abscissa exist In interval and ordinate exist
Figure BDA000027550786001214
Then next pending pixel in interval returns to step 3.-4 and continues to carry out as current pixel point, until source images (S)I i(x 1, y 1) in abscissa exist
Figure BDA000027550786001215
In interval and ordinate exist
Figure BDA000027550786001216
All pixels in interval are disposed, and obtain being embedded with the source images of watermark, are designated as
Figure BDA000027550786001217
Wherein,
Figure BDA000027550786001218
Expression is embedded with the source images of watermark
Figure BDA000027550786001219
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel.
4. adopt the multiple view video coding device to target image (T)I i(x 1, y 1) and be embedded with the source images of watermark
Figure BDA000027550786001220
Carry out coding transmission, the source images that is embedded with watermark after the target image after user side is to coding and coding is decoded, and obtains decoded target image and the decoded source images that is embedded with watermark, and correspondence is designated as respectively
Figure BDA00002755078600131
With
Figure BDA00002755078600132
Wherein,
Figure BDA00002755078600133
Represent decoded target image
Figure BDA00002755078600134
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel,
Figure BDA00002755078600135
Represent the decoded source images that is embedded with watermark
Figure BDA00002755078600136
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel.
In the present embodiment, the multiple view video coding device adopts known HBP coded prediction structure.
5. in different ways to the decoded source images that is embedded with watermark
Figure BDA00002755078600137
Process, if select the color correction mode, execution in step 6., if select the copyright protection pattern, execution in step is 7..
6. according to q=f i(p), to the decoded source images that is embedded with watermark
Figure BDA00002755078600138
In each color component of each pixel carry out color correction, obtain
Figure BDA00002755078600139
Correcting image after color correction, be designated as (C)I i(x 1, y 1), will (C)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel be designated as (C)I i(x 1, y 1),
Figure BDA000027550786001310
7. according to r=α * p β, from the decoded source images that is embedded with watermark
Figure BDA000027550786001311
In extract the watermark image, be designated as (Q)I i(x 1, y 1), will (Q)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel be designated as (Q)I i(x 1, y 1),
Figure BDA000027550786001312
Then judge whether can from the watermark image (Q)I i(x 1, y 1) in observe the watermarking images { P (x of embedding 2, y 2) in the watermark information of each pixel, if can, determine to be embedded with the source images of watermark
Figure BDA000027550786001313
Protected by copyright, otherwise, determine to be embedded with the source images of watermark
Figure BDA000027550786001314
Not protected by copyright.
Below with regard to the inventive method, the subjective performance that " flamenco1 " and " objects2 " two groups of multi-view point video test sets carry out color correction and watermark extracting is compared.
Fig. 3 a, Fig. 3 b, Fig. 3 c, Fig. 3 d and Fig. 3 e have provided respectively five groups of binary bitmap to be embedded, and each resolution of organizing watermarking images is 80 * 80.Fig. 4 a is the color correction image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 a obtains through the inventive method, Fig. 4 c is the color correction image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 a obtains through the inventive method, Fig. 5 a is the color correction image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 b obtains through the inventive method, Fig. 5 c is the color correction image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 b obtains through the inventive method, Fig. 6 a is the color correction image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 c obtains through the inventive method, Fig. 6 c is the color correction image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 c obtains through the inventive method, Fig. 7 a is the color correction image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 d obtains through the inventive method, Fig. 7 c is the color correction image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 d obtains through the inventive method, Fig. 8 a is the color correction image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 e obtains through the inventive method, Fig. 8 c is the color correction image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 e obtains through the inventive method, from Fig. 4 a, Fig. 4 c, Fig. 5 a, Fig. 5 c, Fig. 6 a, Fig. 6 c, Fig. 7 a, Fig. 7 c, Fig. 8 a, the subjective effect of the image shown in Fig. 8 c can be found out, compare with the target image of " objects2 " shown in Fig. 2 c with the target image of " flamenco1 " shown in Fig. 2 a, color appearance and the target image of the color correction image that employing the inventive method obtains are very approaching, and can not perceive the watermark information of embedding from the color correction image, the watermark embed process that the inventive method is described is effective.
Fig. 4 b is the watermark image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 a obtains through the inventive method, Fig. 4 d is the watermark image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 a obtains through the inventive method, Fig. 5 b is the watermark image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 b obtains through the inventive method, Fig. 5 d is the watermark image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 b obtains through the inventive method, Fig. 6 b is the watermark image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 c obtains through the inventive method, Fig. 6 d is the watermark image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 c obtains through the inventive method, Fig. 7 b is the watermark image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 d obtains through the inventive method, Fig. 7 d is the watermark image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 d obtains through the inventive method, Fig. 8 b is the watermark image that the image after the watermarking images shown in Fig. 2 b embedding Fig. 3 e obtains through the inventive method, Fig. 8 d is the watermark image that the image after the watermarking images shown in Fig. 2 d embedding Fig. 3 e obtains through the inventive method, from Fig. 4 b, Fig. 4 d, Fig. 5 b, Fig. 5 d, Fig. 6 b, Fig. 6 d, Fig. 7 b, Fig. 7 d, Fig. 8 b, watermark image shown in Fig. 8 d can be observed the watermarking images of embedding at an easy rate, the watermark extraction process that the inventive method is described is effective.

Claims (6)

1. the processing method of a multi-view image, is characterized in that its processing procedure is: at first, adopt histogram matching to set up the color map relation of target image and source images; Secondly, the function representation form according to Gamma correction is embedded into watermarking images to be embedded in source images, obtains being embedded with the source images of watermark; Then, adopt the multiple view video coding device to carry out coding transmission to target image and the source images that is embedded with watermark, the source images that is embedded with watermark after target image after user side is to coding and coding is decoded, and obtains decoded target image and the decoded source images that is embedded with watermark; At last; each color component to each pixel in the decoded source images that is embedded with watermark carries out color correction; obtain the decoded correcting image of source images after color correction that is embedded with watermark; or extract the watermark image from the decoded source images that is embedded with watermark, whether protected by copyrightly then determine to be embedded with the source images of watermark according to the watermark image.
2. the processing method of a kind of multi-view image according to claim 1 is characterized in that specifically comprising the following steps:
1. synchronization is defined as target image by a visual point image in the multi-view image of the parallel camera system shooting of many viewpoints, be designated as (T)I i(x 1, y 1), and other visual point image is defined as source images, be designated as (S)I i(x 1, y 1), wherein, i=1,2,3 represent respectively luminance component Y, the first chromatic component U and the second chromatic component V in three color components of YUV color space, (x 1, y 1) coordinate position of pixel in expression target image and source images, 1≤x 1≤ W, 1≤y 1≤ H, W represent the width of target image and source images, and H represents the height of target image and source images, (T)I i(x 1, y 1) expression (T)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel, (S)I i(x 1, y 1) expression (S)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel;
2. adopt histogram matching, set up target image (T)I i(x 1, y 1) in each color value and source images (S)I i(x 1, y 1) in the color map relation of corresponding color value, be designated as q=f i(p), wherein, f iThe function representation form of color map relation of i color component of () expression, p represent source images (S)I i(x 1, y 1) in color value, q represent source images (S)I i(x 1, y 1) in the color value of color value after color correction, 0≤p≤255,0≤q≤255;
3. according to the function representation form r=α * p of Gamma correction β, with watermarking images to be embedded { P (x 2, y 2) be embedded into source images (S)I i(x 1, y 1) in, obtain being embedded with the source images of watermark, be designated as
Figure FDA00002755078500011
Wherein, α and β be for controlling parameter, p represent source images (S)I i(x 1, y 1) in color value, r represent source images (S)I i(x 1, y 1) in the color value of color value after Gamma correction, 0≤p≤255,0≤r≤255,
Figure FDA00002755078500021
Expression is embedded with the source images of watermark
Figure FDA00002755078500022
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel, (x 2, y 2) expression watermarking images { P (x to be embedded 2, y 2) in the coordinate position of pixel, 1≤x 2≤ N, 1≤y 2≤ N, N represent watermarking images to be embedded { P (x 2, y 2) the horizontal and vertical size, P (x 2, y 2) expression watermarking images { P (x to be embedded 2, y 2) in coordinate position be (x 2, y 2) the watermark information of pixel;
4. adopt the multiple view video coding device to target image (T)I i(x 1, y 1) and be embedded with the source images of watermark
Figure FDA00002755078500023
Carry out coding transmission, the source images that is embedded with watermark after the target image after user side is to coding and coding is decoded, and obtains decoded target image and the decoded source images that is embedded with watermark, and correspondence is designated as respectively
Figure FDA00002755078500024
With
Figure FDA00002755078500025
Wherein, Represent decoded target image Middle coordinate position is (x 1, y 1) the color value of i color component of pixel,
Figure FDA00002755078500028
Represent the decoded source images that is embedded with watermark
Figure FDA00002755078500029
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel;
5. in different ways to the decoded source images that is embedded with watermark
Figure FDA000027550785000210
Process, if select the color correction mode, execution in step 6., if select the copyright protection pattern, execution in step is 7.;
6. according to q=f i(p), to the decoded source images that is embedded with watermark
Figure FDA000027550785000211
In each color component of each pixel carry out color correction, obtain Correcting image after color correction, be designated as (C)I i(x 1, y 1), will (C)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel be designated as (C)I i(x 1, y 1),
7. according to r=α * p β, from the decoded source images that is embedded with watermark
Figure FDA000027550785000214
In extract the watermark image, be designated as (Q)I i(x 1, y 1), will (Q)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of i color component of pixel be designated as (Q)I i(x 1, y 1),
Figure FDA000027550785000215
Then judge whether can from the watermark image (Q)I i(x 1, y 1) in observe the watermarking images { P (x of embedding 2, y 2) in the watermark information of each pixel, if can, determine to be embedded with the source images of watermark
Figure FDA00002755078500031
Protected by copyright, otherwise, determine to be embedded with the source images of watermark
Figure FDA00002755078500032
Not protected by copyright.
3. the processing method of a kind of multi-view image according to claim 2 is characterized in that described step detailed process 2. is:
2.-1, calculate target image (T)I i(x 1, y 1) the histogram of i color component, be designated as (T)H i(k) | 0≤k≤255}, then calculate (T)H i(k) | the accumulation histogram of 0≤k≤255}, be designated as (T)C i(k) | 0≤k≤255},
Figure FDA00002755078500033
Wherein, (T)H i(k) expression target image (T)I i(x 1, y 1) the color value of i color component be the number of all pixels of k, (T)H i(j) expression target image (T)I i(x 1, y 1) the color value of i color component be the number of all pixels of j, (T)C i(k) expression target image (T)I i(x 1, y 1) the color value of i color component be not more than the accumulative total number of all pixels of k;
2.-2, calculate source images (S)I i(x 1, y 1) the histogram of i color component, be designated as (S)H i(k) | 0≤k≤255}, then calculate (S)H i(k) | the accumulation histogram of 0≤k≤255}, be designated as (S)C i(k) | 0≤k≤255},
Figure FDA00002755078500034
Wherein, (S)H i(k) expression source images (S)I i(x 1, y 1) the color value of i color component be the number of all pixels of k, (S)H i(j) expression source images (S)I i(x 1, y 1) the color value of i color component be the number of all pixels of j, (S)C i(k) expression source images (S)I i(x 1, y 1) the color value of i color component be not more than the accumulative total number of all pixels of k;
2.-3, get source images (S)I i(x 1, y 1) the color value of i color component be not more than p 0The accumulative total number of all pixels (S)C i(p 0), then calculate (S)C i(p 0) and target image (T)I i(x 1, y 1) the color value of i color component be not more than the accumulative total number of all pixels of q (T)C i(q) distance between is designated as (S)C i(p 0)- (T)C i(q) |, then basis (S)C i(p 0)- (T)C i(q) | obtain source images (S)I i(x 1, y 1) in color value p 0With target image (T)I i(x 1, y 1) in color value q 0The color map relation, be designated as q 0=f i(p 0), Wherein, 0≤p 0≤ 255,0≤q 0≤ 255,0≤q≤255, " || " is the symbol that takes absolute value,
Figure FDA00002755078500041
Expression makes (S)C i(p 0)- (T)C i(q) | the q value of value minimum;
2.-4, choose 255 and p 0Different color value is designated as respectively p 1, p 2..., p j′..., p 255, then according to the operating process of step 2.-3, obtain respectively in an identical manner source images (S)I i(x 1, y 1) in color value p 1, p 2..., p j′..., p 255With target image (T)I i(x 1, y 1) in color value q 1, q 2..., q j..., q 255Color map relation one to one, correspondence is designated as q respectively 1=f i(p 1), q 2=f i(p 2) ..., q j′=f i(p j′) ..., q 255=f i(p 255),
Figure FDA00002755078500042
Figure FDA00002755078500043
Figure FDA00002755078500044
Figure FDA00002755078500045
Wherein, 1≤j'≤255,0≤q≤255,0≤p 1, p 2..., p j'..., p 255≤ 255,0≤q 1, q 2..., q j′..., q 255≤ 255, q 1, q 2..., q j′..., q 255Value and q 0Value different, (S)C i(p 1) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p 1The accumulative total number of all pixels, (S)C i(p 2) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p 2The accumulative total number of all pixels, (S)C i(p j′) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p j'The accumulative total number of all pixels, (S)C i(p 255) the expression source images (S)I i(x 1, y 1) the color value of i color component be not more than p 255The accumulative total number of all pixels.
4. the processing method of a kind of multi-view image according to claim 3 is characterized in that described step detailed process 3. is:
3.-1, according to r=α * p β, obtain watermarked optimum density value, be designated as p *,
Figure FDA00002755078500046
Wherein, For getting gradient function,
Figure FDA00002755078500048
Expression makes
Figure FDA00002755078500049
Maximum p value;
3.-2, according to watermarked optimum density value p *, obtain source images (S)I i(x 1, y 1) in watermarked original position, be designated as
Figure FDA000027550785000410
Figure FDA000027550785000411
Wherein,
Figure FDA000027550785000412
Figure FDA000027550785000413
1≤x 0≤ W-N+1,1≤y 0≤ H-N+1, (S)I i(x 1, y 1) the expression source images (S)I i(x 1, y 1) in coordinate position be (x 1, y 1) the color value of the 1st color component of pixel, " || " is the symbol that takes absolute value,
Figure FDA00002755078500051
Expression makes
Figure FDA00002755078500052
Maximum (x 0, y 0);
3.-3, with source images (S)I i(x 1, y 1) in abscissa exist
Figure FDA00002755078500053
In interval and ordinate exist
Figure FDA00002755078500054
The current pixel of processing in interval is defined as current pixel point;
3. the coordinate position of-4, supposing current pixel point is (x 1', y 1'), then judge watermarking images to be embedded { P (x 2, y 2) in coordinate position be The watermark information of pixel whether be 1, if so, revise the color value of the 1st color component of current pixel point, the color value of the 1st color component of amended current pixel point is designated as
Figure FDA00002755078500056
Figure FDA00002755078500057
Otherwise, directly with the color value of the 1st color component of the current pixel point color value as the 1st color component of amended current pixel point, the color value of the 1st color component of amended current pixel point is designated as
Figure FDA00002755078500058
Figure FDA00002755078500059
Wherein, x 1 * ≤ x 1 ′ ≤ x 1 * + N - 1 , y 1 * ≤ y 1 ′ ≤ y 1 * + N - 1 , (S)I i(x 1', y 1') the expression source images (S)I i(x 1, y 1) in coordinate position be (x 1', y 1') the color value of the 1st color component of pixel, Δ is intensity factor;
3.-5, with source images (S)I i(x 1, y 1) in abscissa exist
Figure FDA000027550785000512
In interval and ordinate exist
Figure FDA000027550785000513
Then next pending pixel in interval returns to step 3.-4 and continues to carry out as current pixel point, until source images (S)I i(x 1, y 1) in abscissa exist In interval and ordinate exist
Figure FDA000027550785000515
All pixels in interval are disposed, and obtain being embedded with the source images of watermark, are designated as
Figure FDA000027550785000516
Wherein,
Figure FDA000027550785000517
Expression is embedded with the source images of watermark
Figure FDA000027550785000518
Middle coordinate position is (x 1, y 1) the color value of i color component of pixel.
5. the processing method of a kind of multi-view image according to claim 4, is characterized in that getting α=1, β=0.2 during described step 3..
6. the processing method of a kind of multi-view image according to claim 5, is characterized in that getting Δ=3 in described step 3.-3.
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