技术领域technical field
本发明属于视频监控的防伪技术领域，具体是涉及一种实时隐藏拍摄防伪水印的视频监控装置，及其相应的使用方法和水印检测方法。The invention belongs to the field of anti-counterfeiting technology of video monitoring, and in particular relates to a video monitoring device for hiding and photographing anti-counterfeiting watermarks in real time, a corresponding use method and a watermark detection method thereof.
背景技术Background technique
视频监控是安全防范系统的重要组成部分，传统的监控系统通常包括前端摄像机、传输线缆和视频监控平台，摄像机可分为网络数字摄像机和模拟摄像机，用作前端视频图像信号的采集。监控系统是一种防范能力较强的综合系统，其监控视频以直观、准确、及时和信息内容丰富而广泛应用于许多场合。近年来，随着计算机、网络、图像处理及传输技术的飞速发展，视频监控技术也有了长足的发展。视频监控充分利用多媒体特征，结合实时捕捉、硬盘录像等技术，对犯罪起到了强大的威慑力，更能有效地防止犯罪，实时跟踪每一个监控现场，迅速的反映能力能有效地打击犯罪。视频监控录像往往作为最重要的法律证据，用于驳斥不法分子的抵赖与狡辩，但录像中最重要的部分由于被恶意删除引发的案件也屡见不鲜。Video surveillance is an important part of the security system. Traditional surveillance systems usually include front-end cameras, transmission cables, and video surveillance platforms. Cameras can be divided into network digital cameras and analog cameras, which are used to collect front-end video image signals. The monitoring system is a comprehensive system with strong preventive ability. Its monitoring video is widely used in many occasions because of its intuitiveness, accuracy, timeliness and rich information content. In recent years, with the rapid development of computer, network, image processing and transmission technology, video surveillance technology has also made great progress. Video surveillance makes full use of multimedia features, combined with real-time capture, hard disk recording and other technologies, which has a strong deterrent effect on crime and can more effectively prevent crime. It can track every monitoring scene in real time and quickly respond to crimes effectively. Video surveillance videos are often used as the most important legal evidence to refute criminals' denials and sophistry, but cases where the most important part of the video is maliciously deleted are not uncommon.
视频监控的应用非常广泛，小区安保、购物广场、高速公路、公共汽车以及大型庆典等，而对视频监控录像的准确性和可靠性做出最准确地判断显得尤为重要。由于监控视频使用广泛，并可作为最可靠的法律证据，不法分子起初通过删除硬盘上的数据，将所有的监控视频文件全部销毁进行抵赖，但这些大量数据的丢失肯定会露出很大的破绽，牵扯出一批相关人员，那不法分子还是难逃法网。目前有些不法分子则采用更高明的手段，将监控视频中的关键部分帧删除或替换，这就给判断视频监控录像的准确性和可靠性带来很大的麻烦。Video surveillance is widely used in residential security, shopping plazas, highways, buses, and large-scale celebrations, and it is particularly important to make the most accurate judgments on the accuracy and reliability of video surveillance recordings. Since surveillance video is widely used and can be used as the most reliable legal evidence, criminals initially denied it by deleting data on the hard disk and destroying all surveillance video files. A group of relevant personnel are involved, and the criminals will still be unable to escape the law. At present, some criminals use more sophisticated means to delete or replace key frames in the surveillance video, which brings great trouble to judge the accuracy and reliability of the surveillance video.
为了提高监控视频的防伪性能，中国专利CN104168484A公开了一种基于视觉注意机制的视频水印方法，该发明选择MPEG-2视频关键帧的视觉非显著区域DCT域嵌入二进制水印信息，实现视频防伪和侵权的目的。中国专利CN103997652A公开了一种视频水印嵌入方法及装置，该发明根据待嵌入水印信息的二进制数据以及预设的编码规则，确定待嵌入水印信息所需的编码块数量以及对各个编码块进行编码所需的运动矢量，并根据所确定的编码块数量以及运动矢量，从起始编码块开始对目标视频帧中需嵌入带嵌入水印信息的各个编码块进行编码，以在目标视频帧中嵌入水印信息。中国专利CN102892048A公开了一种抗几何攻击的视频水印防伪方法，该发明通过提取视频帧的最大稳定极值区域MSER，对拟合出的椭圆区域进行筛选，消除区域重叠，选取用于最终的水印嵌入椭圆区域，然后通过修改小波变换系数的水平高频竖直低频带(HL)和水平低频竖直高频带(LH)，对选取出的特征区域进行水印嵌入，增强了抗仿射几何攻击能力。据调研，目前已公开的监控视频水印隐藏技术都基于数字图像处理技术而提出的不同的隐藏算法，未见有采用物理手段实现实时水印隐藏的技术，为此本发明设计了一种实时隐藏拍摄防伪水印的视频监控装置，其水印隐藏方法是通过物理手段来实现的，并提供了相应的使用方法和水印检测方法。In order to improve the anti-counterfeiting performance of surveillance video, Chinese patent CN104168484A discloses a video watermarking method based on the visual attention mechanism. The invention selects the visually insignificant area DCT domain of the MPEG-2 video key frame to embed binary watermark information to realize video anti-counterfeiting and infringement the goal of. Chinese patent CN103997652A discloses a video watermark embedding method and device. The invention determines the number of encoding blocks required to embed watermark information and encodes each encoding block according to the binary data of the watermark information to be embedded and the preset encoding rules. The required motion vector, and according to the determined number of coding blocks and motion vectors, start from the initial coding block to encode each coding block that needs to be embedded with embedded watermark information in the target video frame, so as to embed the watermark information in the target video frame . Chinese patent CN102892048A discloses a video watermark anti-counterfeiting method against geometric attacks. The invention extracts the maximum stable extremum region MSER of the video frame, screens the fitted elliptical region, eliminates region overlap, and selects the final watermark Embed the ellipse area, and then modify the horizontal high-frequency vertical low-frequency band (HL) and horizontal low-frequency vertical high-frequency band (LH) of the wavelet transform coefficients to embed the watermark in the selected feature area, which enhances the anti-affine geometric attack ability. According to research, the currently disclosed surveillance video watermark hiding technologies are all based on different hiding algorithms proposed by digital image processing technology, and there is no technology that uses physical means to realize real-time watermark hiding. For this reason, the present invention designs a real-time hidden shooting The anti-counterfeit watermark video monitoring device, the watermark hiding method is realized by physical means, and the corresponding use method and watermark detection method are provided.
发明内容Contents of the invention
本发明主要是解决现有技术所存在的技术问题，提供了一种实时隐藏拍摄防伪水印的视频监控装置，其水印隐藏方法是通过物理手段来实现的，并提供了相应的使用方法和水印检测方法。The present invention mainly solves the technical problems existing in the prior art, and provides a video monitoring device for real-time hiding and shooting of an anti-counterfeit watermark. The watermark hiding method is realized by physical means, and a corresponding use method and watermark detection are provided. method.
本发明的上述技术问题主要是通过下述技术方案得以解决的：一种实时隐藏拍摄防伪水印的视频监控装置，包括十字交叉的监控视频成像光路和水印成像光路，其中监控视频成像光路依次由监控摄像镜头、光学成像透镜组、分光装置和监控相机CCD构成，监控摄像镜头采用通用的商业安防镜头即可，规格型号没有特殊限制，光学成像透镜组是一个光学适配模块，其作用是延长安防镜头的像距，即将安防镜头拍摄进来的光学像接力成像到监控相机CCD的感光面上，其焦距调节范围是21×6mm，该光路由监控摄像镜头将监控现场图像拍摄进来，然后经光学成像透镜组改变像距后成像到监控相机CCD，从而在监控相机CCD的感光面上产生监控现场的光学图像；水印成像光路依次由低功率可调光源、准直透镜、水印透射掩膜、水印成像透镜组、分光装置和监控相机CCD构成，该光路由低功率可调光源发光，光线经准直透镜准直后照射水印透射掩膜，将水印透射掩膜经水印成像透镜组成像到监控相机CCD，从而在监控相机CCD的感光面上产生水印透射掩膜的光学图像。两个成像光路中的成像透镜组都是用于光学成像，其焦距可通过若干个镜片的位置微调进行调节。两个成像光路中的分光装置和监控相机CCD为光路共用的同一器件，由电源为监控相机CCD和低功率可调光源供电，其中所述分光装置安装在监控视频成像光路和水印成像光路的正交位置，将两路成像合并成一路，使水印图像与监控视频图像实现非相干叠加。所述水印成像光路中，低功率可调光源安装在准直透镜的前焦面上，为水印透射掩膜提供照明，水印透射掩膜在准直透镜和水印成像透镜组之间的位置相对于准直透镜的距离不受限制，可根据设备尺寸大小进行调节，但水印透射掩膜与监控相机CCD相对于水印成像透镜组的安装位置必须是物像关系，以确保水印透射掩膜被水印成像透镜组成像到监控相机CCD的感光面上，其成像大小可由水印成像透镜组进行调节。The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions: a video monitoring device for hiding and shooting anti-counterfeiting watermarks in real time, including cross monitoring video imaging optical paths and watermark imaging optical paths, wherein the monitoring video imaging optical paths are sequentially controlled by the monitoring The camera lens, optical imaging lens group, spectroscopic device and monitoring camera CCD are composed. The monitoring camera lens can be a general-purpose commercial security lens, and there are no special restrictions on specifications and models. The optical imaging lens group is an optical adaptation module, and its function is to extend security protection. The image distance of the lens means that the optical image captured by the security lens is relay-imaged to the photosensitive surface of the surveillance camera CCD, and its focal length adjustment range is 21×6mm. The lens group changes the image distance and images to the CCD of the surveillance camera, thereby generating an optical image of the surveillance scene on the photosensitive surface of the CCD of the surveillance camera; the watermark imaging optical path consists of a low-power adjustable light source, a collimator lens, a watermark transmission mask, and a watermark imaging It consists of a lens group, a spectroscopic device and a monitoring camera CCD. The optical path emits light from a low-power adjustable light source. The light is collimated by a collimating lens and illuminates the watermark transmission mask. The watermark transmission mask is imaged to the monitoring camera CCD through the watermark imaging lens. , so as to generate an optical image of the watermark transmission mask on the photosensitive surface of the surveillance camera CCD. The imaging lens groups in the two imaging optical paths are used for optical imaging, and their focal lengths can be adjusted by fine-tuning the positions of several lenses. The beam splitting device and the monitoring camera CCD in the two imaging optical paths are the same device shared by the optical paths, and the power supply supplies power to the monitoring camera CCD and the low-power adjustable light source. At the intersection position, the two imaging channels are combined into one, so that the watermark image and the surveillance video image can be incoherently superimposed. In the watermark imaging optical path, a low-power adjustable light source is installed on the front focal plane of the collimator lens to provide illumination for the watermark transmission mask, and the position of the watermark transmission mask between the collimator lens and the watermark imaging lens group is relative to The distance of the collimating lens is not limited and can be adjusted according to the size of the equipment, but the installation position of the watermark transmission mask and the monitoring camera CCD relative to the watermark imaging lens group must be in an object-image relationship to ensure that the watermark transmission mask is imaged by the watermark The lens group images the photosensitive surface of the surveillance camera CCD, and its imaging size can be adjusted by the watermark imaging lens group.
作为优选，所述为水印透射掩膜提供照明的低功率可调光源优先选用LED光源，但不限于LED光源，其驱动电压为1.8～3.6V，电流为20mA，色温为4000～7000，亮度可调；进一步地，所述为水印透射掩膜提供照明的低功率可调光源优先选用LED白色光源，但也可以选用其他颜色，如蓝色、绿色等。As a preference, the low-power adjustable light source that provides illumination for the watermark transmission mask is preferably an LED light source, but not limited to an LED light source, whose driving voltage is 1.8-3.6V, current is 20mA, color temperature is 4000-7000, and brightness can be adjusted Further, the low-power adjustable light source that provides illumination for the watermark transmission mask is preferably a white LED light source, but other colors, such as blue and green, can also be used.
作为优选，所述分光装置优先选用分光棱镜，但不限于分光棱镜，还可以选用光栅、分光镜片等。Preferably, the spectroscopic device is preferably a spectroscopic prism, but not limited to a spectroscopic prism, gratings, spectroscopic mirrors, etc. can also be used.
作为优选，视频监控装置中的水印透射掩膜是将待隐藏的原始水印图案经双随机相位调制后形成的近似白噪声的透光片，其在监控相机CCD感光表面的成像也是白噪声的图像，其图像的亮度通过低功率可调光源的强度进行调节，其平均亮度是监控图像平均亮度的15％～25％，以便于叠加后监控视频图像中的水印不易被觉察到，提高水印防伪的隐蔽性。水印透射掩膜的具体制作方法为：(1)将待隐藏的原始水印图案进行灰度化W(m,n)，制作出原始水印图案的灰度化图；(2)生成两个相位值平均分布在0～2π之间的随机数阵列和以该随机数阵列为相位构建两个纯相位图和其中相位图称为空域随机相位图，相位图称为频域随机相位图；(3)用上述空域随机相位图乘以原始水印图案的灰度化图并做傅里叶变换，即得傅里叶变换图(4)将上述傅里叶变换图乘以频域随机相位图并做傅里叶逆变换，即(5)取上述逆傅里叶变换的实部构建一个新的近似白噪声的水印图，并将该水印图调制到透射空间光调制器或模压到透明胶片上，制作成双随机相位调制水印透射掩膜。As a preference, the watermark transmission mask in the video monitoring device is a translucent sheet of approximate white noise formed after double random phase modulation of the original watermark pattern to be hidden, and its imaging on the CCD photosensitive surface of the monitoring camera is also an image of white noise , the brightness of the image is adjusted by the intensity of the low-power adjustable light source, and its average brightness is 15% to 25% of the average brightness of the monitoring image, so that the watermark in the monitoring video image after superimposition is not easy to be noticed, and the anti-counterfeiting of the watermark is improved Concealment. The specific production method of the watermark transmission mask is as follows: (1) Grayscale the original watermark pattern to be hidden W(m,n) to produce a grayscale image of the original watermark pattern; (2) Generate two phase values An array of random numbers evenly distributed between 0 and 2π and Construct two phase-only diagrams with this random number array as phase and where the phase diagram called the spatial random phase map, the phase map It is called the frequency-domain random phase map; (3) multiply the above-mentioned space-domain random phase map by the grayscale image of the original watermark pattern and perform Fourier transform to obtain the Fourier transform map (4) Multiply the above Fourier transform map by the frequency domain random phase map and perform Fourier inverse transform, that is (5) Take the real part of the above inverse Fourier transform to construct a new approximate white noise watermark image, and modulate the watermark image into a transmission spatial light modulator or mold it on a transparent film to make a double random phase modulation watermark transmission mask.
本发明视频监控装置的使用方法为：首先启动电源为监控相机CCD和低功率可调光源供电，调节低功率可调光源的亮度，使其平均亮度为监控摄像镜头通光亮度的15％～25％，低功率可调光源发出的光经准直透镜准直后照射水印透射掩膜，再经水印光学透镜组和分光装置成像到监控相机CCD的感光面，与来自监控摄像镜头的监控视频图像进行非相干叠加，即可得到隐藏有水印图案的视频图像。The using method of the video monitoring device of the present invention is as follows: first start the power supply to supply power for the monitoring camera CCD and the low-power adjustable light source, and adjust the brightness of the low-power adjustable light source so that its average brightness is 15% to 25% of the brightness of the monitoring camera lens. %, the light emitted by the low-power adjustable light source is collimated by the collimator lens and then irradiates the watermark transmission mask, and then is imaged to the photosensitive surface of the surveillance camera CCD through the watermark optical lens group and the light splitting device, and the surveillance video image from the surveillance camera lens By performing non-coherent superposition, a video image with a hidden watermark pattern can be obtained.
使用本发明视频监控装置得到的视频图像，其中隐藏水印图案的检测方法为：(1)提取视频图像帧序列，得到按时间顺序排列的数字图像序列，若是彩色图像则对图像进行灰度化处理；(2)对上述视频图像进行傅里叶变换，并提取傅里叶变换图的相位ψ(m,n)，生成纯相位函数exp{jψ(m,n)}；(3)将上述纯相位函数乘以频域随机相位图，即(4)对做傅里叶逆变换，取模即为视频图像中隐藏的水印图案，也就是Using the video image obtained by the video monitoring device of the present invention, the detection method of the hidden watermark pattern is: (1) extracting the video image frame sequence to obtain a sequence of digital images arranged in time order, and if it is a color image, the image is grayscaled ; (2) Perform Fourier transform on the above video image, and extract the phase ψ(m,n) of the Fourier transform image to generate a pure phase function exp{jψ(m,n)}; (3) Transform the above pure The phase function is multiplied by the frequency-domain random phase map, that is, (4) yes Doing inverse Fourier transform, taking the modulus is the hidden watermark pattern in the video image, that is
本发明采用物理手段实现实时拍摄防伪水印隐藏于监控视频中，借此本发明可提高监控视频的防伪性和可靠性，进而从技术角度确保监控视频的公信力，较之于传统的基于数字图像处理来实现水印隐藏的方法，更加容易实现，有利于降低系统成本。The present invention uses physical means to realize real-time shooting of anti-counterfeiting watermarks hidden in surveillance videos, thereby improving the anti-counterfeiting and reliability of surveillance videos, and ensuring the credibility of surveillance videos from a technical point of view. Compared with traditional digital image processing based The method for realizing watermark hiding is easier to implement and helps reduce system cost.
附图说明Description of drawings
图1是本发明视频监控装置的一种结构示意图；Fig. 1 is a kind of structural representation of video monitoring device of the present invention;
图2是本发明待隐藏原始水印图案的一种示意图；Fig. 2 is a schematic diagram of the original watermark pattern to be hidden in the present invention;
图3是本发明空域随机相位图的一种示意图；Fig. 3 is a kind of schematic diagram of the airspace random phase diagram of the present invention;
图4是本发明频域随机相位图的一种示意图；Fig. 4 is a kind of schematic diagram of frequency domain random phase figure of the present invention;
图5是本发明经双随机相位调制后形成的近似白噪声化水印图；Fig. 5 is an approximate white noise watermark diagram formed after double random phase modulation in the present invention;
图6是本发明按时间顺序排列数字图像序列的一种示意图；Fig. 6 is a kind of schematic diagram that the present invention arranges the sequence of digital images in chronological order;
图7是本发明检测出的图6中隐藏水印图案的一种示意图。Fig. 7 is a schematic diagram of the hidden watermark pattern in Fig. 6 detected by the present invention.
图中，1-低功率可调光源，2-准直透镜，3-水印透射掩膜，4-水印成像透镜组，5-分光装置，6-光学成像透镜组，7-监控摄像镜头，8-监控相机CCD，9-电源。In the figure, 1-low power adjustable light source, 2-collimator lens, 3-watermark transmission mask, 4-watermark imaging lens group, 5-beam splitting device, 6-optical imaging lens group, 7-monitoring camera lens, 8 - Surveillance camera CCD, 9-power supply.
具体实施方式Detailed ways
下面通过实施例，并结合附图，对本发明的技术方案作进一步具体的说明。The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.
实施例：参看图1，本发明包括十字交叉的监控视频成像光路和水印成像光路，其中监控视频成像光路依次由监控摄像镜头、光学成像透镜组、分光装置和监控相机CCD构成，监控摄像镜头采用通用的商业安防镜头即可，规格型号没有特殊限制，光学成像透镜组是一个光学适配模块，其作用是延长安防镜头的像距，即将安防镜头拍摄进来的光学像接力成像到监控相机CCD的感光面上，其焦距调节范围是21×6mm，该光路由监控摄像镜头将监控现场图像拍摄进来，然后经光学成像透镜组改变像距后成像到监控相机CCD，从而在监控相机CCD的感光面上产生监控现场的光学图像；水印成像光路依次由低功率可调光源、准直透镜、水印透射掩膜、水印成像透镜组、分光装置和监控相机CCD构成，该光路由低功率可调光源发光，光线经准直透镜准直后照射水印透射掩膜，将水印透射掩膜经水印成像透镜组成像到监控相机CCD，从而在监控相机CCD的感光面上产生水印透射掩膜的光学图像。两个成像光路中的成像透镜组都是用于光学成像，其焦距可通过若干个镜片的位置微调进行调节。两个成像光路中的分光装置和监控相机CCD为光路共用的同一器件，由电源为监控相机CCD和低功率可调光源供电，其中所述分光装置安装在监控视频成像光路和水印成像光路的正交位置，将两路成像合并成一路，使水印图像与监控视频图像实现非相干叠加。所述水印成像光路中，低功率可调光源安装在准直透镜的前焦面上，为水印透射掩膜提供照明，水印透射掩膜在准直透镜和水印成像透镜组之间的位置相对于准直透镜的距离不受限制，可根据设备尺寸大小进行调节，但水印透射掩膜与监控相机CCD相对于水印成像透镜组的安装位置必须是物像关系，以确保水印透射掩膜被水印成像透镜组成像到监控相机CCD的感光面上，其成像大小可由水印成像透镜组进行调节。所述为水印透射掩膜提供照明的低功率可调光源优先选用LED光源，但不限于LED光源，优先选用LED白色光源，但也可以选用其他颜色，如蓝色、绿色等，其驱动电压为1.8～3.6V，电流为20mA，色温为4000～7000，亮度可调。所述分光装置优先选用分光棱镜，但不限于分光棱镜，还可以选用光栅、分光镜片等。Embodiment: Referring to Fig. 1, the present invention comprises the monitoring video imaging optical path and the watermark imaging optical path of cross, wherein the monitoring video imaging optical path is constituted by monitoring camera lens, optical imaging lens group, spectroscopic device and monitoring camera CCD successively, and monitoring camera lens adopts A general-purpose commercial security lens is enough, and there are no special restrictions on specifications and models. The optical imaging lens group is an optical adaptation module, whose function is to extend the image distance of the security lens, and relay the optical image captured by the security lens to the CCD of the surveillance camera. On the photosensitive surface, its focal length adjustment range is 21×6mm. The optical route monitor camera lens captures the monitoring site image, and then changes the image distance through the optical imaging lens group to image the image on the monitoring camera CCD, so that the image on the photosensitive surface of the monitoring camera CCD The optical image of the monitoring site is generated on the monitoring site; the watermark imaging optical path is composed of a low-power adjustable light source, a collimator lens, a watermark transmission mask, a watermark imaging lens group, a spectroscopic device, and a monitoring camera CCD. The optical path emits light from a low-power adjustable light source , the light is collimated by the collimator lens and irradiates the watermark transmission mask, and the watermark transmission mask is imaged to the monitoring camera CCD through the watermark imaging lens group, so as to generate an optical image of the watermark transmission mask on the photosensitive surface of the monitoring camera CCD. The imaging lens groups in the two imaging optical paths are used for optical imaging, and their focal lengths can be adjusted by fine-tuning the positions of several lenses. The beam splitting device and the monitoring camera CCD in the two imaging optical paths are the same device shared by the optical paths, and the power supply supplies power to the monitoring camera CCD and the low-power adjustable light source. At the intersection position, the two imaging channels are combined into one, so that the watermark image and the surveillance video image can be incoherently superimposed. In the watermark imaging optical path, a low-power adjustable light source is installed on the front focal plane of the collimator lens to provide illumination for the watermark transmission mask, and the position of the watermark transmission mask between the collimator lens and the watermark imaging lens group is relative to The distance of the collimating lens is not limited and can be adjusted according to the size of the equipment, but the installation position of the watermark transmission mask and the monitoring camera CCD relative to the watermark imaging lens group must be in an object-image relationship to ensure that the watermark transmission mask is imaged by the watermark The lens group images the photosensitive surface of the surveillance camera CCD, and its imaging size can be adjusted by the watermark imaging lens group. The low-power adjustable light source that provides illumination for the watermark transmissive mask is preferably an LED light source, but not limited to an LED light source. The white LED light source is preferred, but other colors can also be used, such as blue, green, etc., and its driving voltage is 1.8-3.6V, current 20mA, color temperature 4000-7000, brightness adjustable. The beam-splitting device is preferably a beam-splitting prism, but is not limited to a beam-splitting prism, and may also be a grating, a beam-splitting mirror, and the like.
视频监控装置中的水印透射掩膜是将待隐藏的原始水印图案经双随机相位调制后形成的近似白噪声的透光片，其在监控相机CCD感光表面的成像也是白噪声的图像，其图像的亮度通过低功率可调光源的强度进行调节，其平均亮度是监控图像平均亮度的15％～25％，以便于叠加后监控视频图像中的水印不易被觉察到，提高水印防伪的隐蔽性。水印透射掩膜的具体制作方法为：(1)将待隐藏的原始水印图案进行灰度化W(m,n)，制作出原始水印图案的灰度化图；(2)生成两个相位值平均分布在0～2π之间的随机数阵列和以该随机数阵列为相位构建两个纯相位图和其中相位图称为空域随机相位图，相位图称为频域随机相位图；(3)用上述空域随机相位图乘以原始水印图案的灰度化图并做傅里叶变换，即得傅里叶变换图(4)将上述傅里叶变换图乘以频域随机相位图并做傅里叶逆变换，即(5)取上述逆傅里叶变换的实部构建一个新的近似白噪声的水印图，并将该水印图调制到透射空间光调制器或模压到透明胶片上，制作成双随机相位调制水印透射掩膜。The watermark transmission mask in the video surveillance device is a light-transmitting sheet that approximates white noise formed by double random phase modulation of the original watermark pattern to be hidden. Its imaging on the CCD photosensitive surface of the surveillance camera is also an image of white noise. The brightness of the monitor is adjusted by the intensity of the low-power adjustable light source, and its average brightness is 15% to 25% of the average brightness of the monitoring image, so that the watermark in the monitoring video image after superposition is not easy to be noticed, and the concealment of the watermark anti-counterfeiting is improved. The specific production method of the watermark transmission mask is as follows: (1) Grayscale the original watermark pattern to be hidden W(m,n) to produce a grayscale image of the original watermark pattern; (2) Generate two phase values An array of random numbers evenly distributed between 0 and 2π and Construct two phase-only diagrams with this random number array as phase and where the phase diagram called the spatial random phase map, the phase map It is called the frequency-domain random phase map; (3) multiply the above-mentioned space-domain random phase map by the grayscale image of the original watermark pattern and perform Fourier transform to obtain the Fourier transform map (4) Multiply the above Fourier transform map by the frequency domain random phase map and perform Fourier inverse transform, that is (5) Take the real part of the above inverse Fourier transform to construct a new approximate white noise watermark image, and modulate the watermark image into a transmission spatial light modulator or mold it on a transparent film to make a double random phase modulation watermark transmission mask.
本发明视频监控装置的使用方法为：首先启动电源为监控相机CCD和低功率可调光源供电，调节低功率可调光源的亮度，使其平均亮度为监控摄像镜头通光亮度的15％～25％，低功率可调光源发出的光经准直透镜准直后照射水印透射掩膜，再经水印光学透镜组和分光装置成像到监控相机CCD的感光面，与来自监控摄像镜头的监控视频图像进行非相干叠加，即可得到隐藏有水印图案的视频图像。The using method of the video monitoring device of the present invention is as follows: first start the power supply to supply power for the monitoring camera CCD and the low-power adjustable light source, and adjust the brightness of the low-power adjustable light source so that its average brightness is 15% to 25% of the brightness of the monitoring camera lens. %, the light emitted by the low-power adjustable light source is collimated by the collimator lens and then irradiates the watermark transmission mask, and then is imaged to the photosensitive surface of the surveillance camera CCD through the watermark optical lens group and the light splitting device, and the surveillance video image from the surveillance camera lens By performing non-coherent superposition, a video image with a hidden watermark pattern can be obtained.
使用本发明视频监控装置得到的视频图像，其中隐藏水印图案的检测方法为：(1)提取视频图像帧序列，得到按时间顺序排列的数字图像序列，若是彩色图像则对图像进行灰度化处理；(2)对上述视频图像进行傅里叶变换，并提取傅里叶变换图的相位ψ(m,n)，生成纯相位函数exp{jψ(m,n)}；(3)将上述纯相位函数乘以频域随机相位图，即(4)对做傅里叶逆变换，取模即为视频图像中隐藏的水印图案，也就是Using the video image obtained by the video monitoring device of the present invention, the detection method of the hidden watermark pattern is: (1) extracting the video image frame sequence to obtain a sequence of digital images arranged in time order, and if it is a color image, the image is grayscaled ; (2) Perform Fourier transform on the above video image, and extract the phase ψ(m,n) of the Fourier transform image to generate a pure phase function exp{jψ(m,n)}; (3) Transform the above pure The phase function is multiplied by the frequency-domain random phase map, that is, (4) yes Doing inverse Fourier transform, taking the modulus is the hidden watermark pattern in the video image, that is
本发明采用物理手段实现实时拍摄防伪水印隐藏于监控视频中，借此本发明可提高监控视频的防伪性和可靠性，进而从技术角度确保监控视频的公信力，较之于传统的基于数字图像处理来实现水印隐藏的方法，更加容易实现，有利于降低系统成本。The present invention uses physical means to realize real-time shooting of anti-counterfeiting watermarks hidden in surveillance videos, thereby improving the anti-counterfeiting and reliability of surveillance videos, and ensuring the credibility of surveillance videos from a technical point of view. Compared with traditional digital image processing based The method for realizing watermark hiding is easier to implement and helps reduce system cost.
最后，应当指出，以上实施例仅是本发明较有代表性的例子。显然，本发明的技术方案并不限于上述实施例，还可以有许多变形。本领域的普通技术人员能从本发明公开的内容直接导出或联想到的所有变形，均应认为是本发明的保护范围。Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Apparently, the technical solutions of the present invention are not limited to the above-mentioned embodiments, and many variations are possible. All deformations that can be directly derived or associated by those skilled in the art from the content disclosed in the present invention should be considered as the protection scope of the present invention.
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| CN201510429980.1ACN105049805B (en) | 2015-01-04 | 2015-07-21 | A kind of video monitoring apparatus for hiding shooting anti-counterfei waterprint in real time |
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| CN201510002833 | 2015-01-04 | ||
| CN201510429980.1ACN105049805B (en) | 2015-01-04 | 2015-07-21 | A kind of video monitoring apparatus for hiding shooting anti-counterfei waterprint in real time |
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| CN105049805Atrue CN105049805A (en) | 2015-11-11 |
| CN105049805B CN105049805B (en) | 2018-04-13 |
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| CN201520529050.9UWithdrawn - After IssueCN205179222U (en) | 2015-01-04 | 2015-07-21 | Real -time video monitoring device of shooing anti -fake watermark of hiding |
| CN201510429980.1AExpired - Fee RelatedCN105049805B (en) | 2015-01-04 | 2015-07-21 | A kind of video monitoring apparatus for hiding shooting anti-counterfei waterprint in real time |
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