Showing papers on "Alpha compositing published in 2018"
TL;DR: A graph wavelet transform-based steganography using graph signal processing (GSP) is presented, which results in better visual quality stego image as well as extracted secret image and simulation results show that the proposed scheme is more robust than other existing Steganography techniques.
Abstract: Steganography is used for secret or covert communication. A graph wavelet transform-based steganography using graph signal processing (GSP) is presented, which results in better visual quality stego image as well as extracted secret image. In the proposed scheme, graph wavelet transforms of both the cover image and transformed secret image (using Arnold cat map) are taken followed by alpha blending operation. The GSP-based inverse wavelet transform is performed on the resulting image, to get the stego image. Here, the use of GSP increases the inter-pixel correlation that results in better visual quality stego and extracted secret image as shown in simulation results. Simulation results show that the proposed scheme is more robust than other existing steganography techniques.
30 citations
Patent•
23 Feb 2018
TL;DR: In this paper, an interactive type image segmentation and fusion method based on a grabucut algorithm is proposed, which consists of adopting a pyramid down-sampling to reduce a resolution of an image, using few typical pixel points to estimate a GMM parameter, using an Interactive type technology to mark a foreground and a background of the image, performing watershed segmentation, performing modification on a mask image obtained from segmentation.
Abstract: The invention discloses an interactive type image segmentation and fusion method based on a grabucut algorithm. The interactive type image segmentation and fusion method based on a grabucut algorithmcomprises steps of adopting a pyramid down-sampling to reduce a resolution of an image, using few typical pixel points to estimate a GMM parameter, using an interactive type technology to mark a foreground and a background of the image, performing watershed segmentation, performing modification on a mask image obtained from segmentation and transmitting the modified the mask image to a grabucut for fine segmentation, performing morphological processing on the segmented image, continuously performing pixel transformation and morphological processing on a processed image to obtain a tripartite graph, using the trimap graph and a source graph as inputs, using a shared matting algorithm to obtain an alpha channel image of the foreground image, using the alpha channel image, the source image and a new background image as inputs and using an alpha blending transparent mixed algorithm to obtained a fused image.
14 citations
Patent•
19 Jun 2018TL;DR: In this article, an image processing apparatus includes an acquisition unit configured to acquire a bitmap image in which each of contained pixels has an alpha value indicating opacity of this pixel, and a rendering unit config to render the image.
Abstract: An image processing apparatus includes an acquisition unit configured to acquire a bitmap image in which each of contained pixels has an alpha value indicating opacity of this pixel, and a rendering unit configured to render the bitmap image. The rendering unit is configured to, when rendering the bitmap image, refrain from performing alpha blending on a pixel contained in the bitmap image that has a specific alpha value and perform the alpha blending on a pixel contained in the bitmap image that has a different alpha value from the specific alpha value.
6 citations
01 Nov 2018
TL;DR: The proposed mapping method, which combines planar and hemispherical projection method, makes it possible to see around the vehicle at various viewpoints of 360-degree and may be useful for safe driving and accurate accident investigation.
Abstract: Most current vehicle black boxes with AVM (Around View Monitoring) function provide a bird's-eye view of 2D type. This viewpoint is a form of looking at the vehicle from above so that it gives the driver a sense of spatial heterogeneity. In addition, the top-view type has a limited viewing angle, which makes it difficult to conduct an accident investigation, parking and so on. To solve these problems, we propose the 3D A VM algorithm using image composition of multi-channel cameras in this paper. The proposed 3D AVM algorithm is divided into three stages. In the first stage, we perform distortion correction of wide-angle lens and perspective transform. The image stitching, white balance and alpha blending are made in the second stage. The 3D texture mapping is executed in the final stage. This proposed mapping method, which combines planar and hemispherical projection method, makes it possible to see around the vehicle at various viewpoints of 360-degree. The experimental study results indicate that the proposed method overcome the disadvantages of the 2D AVM black boxes and may be useful for safe driving and accurate accident investigation.
6 citations
TL;DR: Experimental results reveal that the proposed remote sensing image fusion method is superior to the existing state-of-the-art methods.
Abstract: A remote sensing image fusion method based on the matting model is presented. The matting model refers to each band of the hyperspectral (HS) image that can be decomposed into three components, i.e., alpha channel, spectral foreground, and spectral background. First, the panchromatic (PAN) is sharpened to enhance the spatial details and the intensity component of the HS image is obtained by the nonlinear synthesis method. Different from the traditional matting model-based method in which the PAN image serves as the alpha channel, we subsequently transform the sharpened PAN image and the intensity component to the principal components analysis domain to obtain the first principal components channel. The first principal components channel is selected as the alpha channel of the HS image. The selected alpha channel contains most of the spatial information of both the PAN and HS images. Finally, the HS foreground and HS background are estimated by the alpha channel, and the fused HS image can be reconstructed perfectly. Experimental results reveal that the proposed method is superior to the existing state-of-the-art methods.
2 citations
TL;DR: This paper incorporates different techniques of digital image watermarking and the comparison of various performance criteria of digital images protection schemes.
Abstract: The rapid expansion of internet in the past years has rapidly increased the availability of digital data such as audio, images and videos to the public. The problem of protecting multimedia information becomes more important. A lot of copyright owners are concerned about protecting any illegal duplication of their data or work. This is an interesting challenge and this is probably why so much attention has been drawn toward the development of digital images protection schemes. Digital image watermarking technique solves this problem to the great extent. This paper incorporates different techniques of digital image watermarking and the comparison of various performance criteria of digital image.
2 citations
Patent•
26 Jul 2018
TL;DR: In this paper, a watermark embedding method is proposed, in which the watermark image is generated by considering at least one of allowable pixel value range and alpha value α range of the watermarks applied to a first pixel of the original image.
Abstract: Disclosed is a watermark embedding method. The method includes receiving an original image, generating a watermark image based on the selected watermark pattern, generating an alpha blended stego image by alpha blending the original image and the watermark image, and providing the alpha blended stego image, in which the watermark image is generated by considering at least one of allowable pixel value range and alpha value α range of the watermark pattern applied to a first pixel of the original image, wherein the at least one of allowable pixel value range and alpha value α range are determined by the difference of pixel value of the first pixel between the original image and the stego image by embedding the watermark pattern to the first pixel.
2 citations
25 Oct 2018
TL;DR: A novel image steganography algorithm based on alpha blending technique through Discrete Haar Wavelet Transform (ABT-DWT) is proposed that reaches a high level that satisfies all steganographic parameters comparing with similar previous results under the same domain.
Abstract: Steganography is the process of secret communication, it is the art of dissimulating information into digital mediums such as images. This discipline is still a thriving domain under information hiding and security field. In this paper, we propose a novel image steganography algorithm based on alpha blending technique through Discrete Haar Wavelet Transform (ABT-DWT). The hidden data is located in the most robust area under the frequency transform of the image. Intensive experiments are achieved in order to validate its efficiency by examining it with different kinds of images and four increased cases of capacity of hiding. Results indicate that the proposed algorithm reaches a high level that satisfies all steganographic parameters comparing with similar previous results under the same domain. The findings enhance the image steganography techniques and their performance.
2 citations
08 Mar 2018
TL;DR: In this research work, a new technique for invisible watermarking of images using alpha blending has been proposed and this can be used in image steganography also.
Abstract: Development of computer networking generates many benefits in cyber world. Due to this great advancement, nowadays networking facilities are available at very low cost. But unfortunately this easy access becomes a threat to information security. Watermarking is a technique that is very often used in image processing to trace copyrighted products. It can also be used to trace products which are illegally distributed without permission. In our research work, a new technique for invisible watermarking of images using alpha blending has been proposed. Alpha blending is used to display an alpha bitmap and an alpha bitmap is that one which has transparent and semi-transparent pixels. We have worked on color image and gray scale image. Gray scale image is used as watermark image which is kept hidden in the main scale image by different values of alpha in alpha blending method. This technique is actually done on each plane of the color image. The resulting image contains the information of color image and gray scale images but the main image is unseen to others. PSNR values are also calculated to check the robustness of the reconstructed image. Applying some post-processing work, this can be used in image steganography also.
2 citations
TL;DR: Zhang et al. as discussed by the authors presented a novel approach of creating face makeup upon a face image with another images as the style examples, which is analogous to physical makeup, as they modify the color and skin details while preserving the face structure.
2 citations
Patent•
12 Jun 2018
TL;DR: In this paper, the authors proposed a method for adding a semi-transparent attribute to a JPG image file, which can effectively reduce the size of an installation package which employs a large number of PNG images through employing the extended JPG files, and reduce the cost in traffic flow in downloading of the installation package.
Abstract: The invention proposes a method for adding a semi-transparent attribute to a JPG image file, and the method comprises the steps: storing Alpha channel data in an unoccupied band of the JPG format; recognizing the band storing the Alpha channel data from the data at the JPG format; decoding the data in the recognized band into the Alpha channel data; combining the Alpha channel data with the RGB channel data which is decoded and converted in JPG scanning, and forming a semi-transparent required RGBA data format. The method can achieve the adding of the semi-transparent attribute to the JPG image file, effectively reduces the size of the image, can effectively reduce the size of an installation package which employs a large number of PNG images through employing the extended JPG files, and reduces the cost in traffic flow in the downloading of the installation package.
Patent•
22 Jun 2018
TL;DR: In this article, the alpha channel image after convolution is applied to the cutout processing of the target image and a boundary corrosion effect is achieved; simultaneously, relative to two-dimensional convolution, convolution operation is simplified, and the method and the device are suitable for the special effect processing and synthesis technology of a high quality video or an image.
Abstract: The invention relates to the image processing field and especially relates to an alpha channel boundary corrosion method and a device. The method comprises the following steps of acquiring the alpha channel image of a target image, wherein the alpha channel image includes the alpha value of each pixel point; according to a preset convolution kernel and a preset convolution kernel radius, carryingout one-dimensional transverse convolution processing and a one-dimensional vertical convolution processing on the alpha value of each pixel point of the alpha channel image; and according to the alpha value of each pixel point of the alpha channel image after the convolution processing, carrying out cutout processing on the target image, wherein the convolution kernel is defined in the description, sigma is a preset value, the sigma is greater than or equal to 0 and is less than or equal to 1, and p is transverse relative coordinates or vertical relative coordinates of the pixel point participating in convolution and the pixel point of target convolution. In the invention, the alpha channel image after convolution is applied to the cutout processing of the target image and a boundary corrosion effect is achieved; simultaneously, relative to two-dimensional convolution, convolution operation is simplified, and the method and the device are suitable for the special effect processing andsynthesis technology of a high quality video or an image.
31 Oct 2018
TL;DR: In this article, the authors describe the volumetric transparency method for rendering transparent objects that departs from classic alpha blending, and discuss per-pixel lists of surface fragments and evaluates illumination analytically between neighboring pairs.
Abstract: This chapter describes the volumetric transparency method for rendering transparent objects that departs from classic alpha blending. It discusses per-pixel lists of surface fragments and evaluates illumination analytically between neighboring pairs. The chapter discusses an algorithm for the case when the transparent objects are spheres. It suggests that executing a single iteration step of the intersection algorithm is sufficient to provide the required detail. The pixel shader traces linked lists reading fragments into a local array and sorts them according to their distance. The chapter shows how the approach can be extended to volumetric transparency, and even intersecting objects. Thus, volumetric transparency can be seen both as a relatively low-cost improvement to order-independent transparency and as a sophisticated approach to replace billboards in particle rendering. Thus, the method is geared at the most prevalent application of transparency: particle system rendering, where it avoids all popping and clipping artifacts characteristic of alpha-blended billboard clouds.
22 Jul 2018
TL;DR: A novel hyperspectral (HS) image fusion method using matting model is presented, and experiments reveal that the proposed method is superior to the state-of-the-art methods.
Abstract: In this paper, a novel hyperspectral (HS) image fusion method using matting model is presented. Matting model refers to each band of an HS image that can be decomposed into three components, i.e., alpha channel, spectral foreground, and spectral background. First, panchromatic (PAN) image is sharpened to enhance details, and the spatial information of each band of HS image is obtained by weighted least squares filtering. Different from traditional matting model based methods that PAN image is served as the alpha channel, we do the PCA transformation to PAN image and spatial information of each band to obtain the first principal component channel which is selected for the alpha channel. This processing reduces spatial distortion. Finally, HS foreground and HS background are estimated by the alpha channel, and the fused HS image is reconstructed nearly perfectly. Experiments reveal that the proposed method is superior to the state-of-the-art methods.
Patent•
06 Mar 2018
TL;DR: In this paper, an implicit imaging communication method based on alpha channel parameters is proposed, which is used for solving the problem existing in the prior art that information needs to be modulated by means of changes of R, G and B of images or parameter values related to R, B and C of the images.
Abstract: The invention discloses an implicit imaging communication method based on alpha channel parameters. The implicit imaging communication method comprises receiving information to be transmitted and alpha channel parameters; integrating the information to be transmitted with the alpha channel parameters in order to generate a modulation signal; receiving an image parameter; integrating the image parameter with the modulation signal in order to generate an image signal; displaying the image signal; and acquiring and detecting the image signal in order to extract the information to be transmitted and output the information to be transmitted. The implicit imaging communication method based on the alpha channel parameters is used for solving the problem existing in the prior art that informationneeds to be modulated by means of changes of R, G and B of images or parameter values related to R, G and B of the images.
Patent•
04 Sep 2018
TL;DR: In this paper, a real-time matting method for color images is presented, which comprises the steps of performing a matting algorithm operation on a color image by using matting parameters to obtain an initial alpha channel image, obtaining a three-channel RGB image according to the initial alpha channels image and the color image, and calculating six-channel data according to color image.
Abstract: The invention provides a real-time matting method, which comprises the steps of performing a matting algorithm operation on a color image by using matting parameters to obtain an initial alpha channelimage, obtaining a three-channel RGB image according to the initial alpha channel image and the color image, and calculating six-channel data according to the color image; calculating a surrounding pixel average value of the color image, the channel image, the six-channel data and the three-channel RGB image according to the blur radius; calculating the covariance of the three-channel RGB image and the variance of the six-channel data according to the surrounding pixel average value; calculating a correlation coefficient of the three-channel RGB image and the channel image; calculating a blurvalue of the correlation coefficient according to the blur radius; and obtaining a final Alpha channel image according to the blur value of the correlation coefficient. The embodiment of the invention further provides a real-time matting device and a terminal device. By using the embodiment of the invention, a matting operation under a real-time condition can be optimized, and the user experienceis improved.
TL;DR: This research paper proposes Sabiomha, an image forgery technique that make use of image steganography that can easily validate originality of a digital image by exposing any tampering.
Abstract: Digital images are a very popular way of transfer-ring media. However, their integrity remains challenging because these images can easily be manipulated with the help of software tools and such manipulations cannot be verified through a naked-eye. Although there exist some techniques to validate digital images, but in practice, it is not a trivial task as the existing approaches to forgery detection are not very effective. Therefore, there is need for a simple and efficient solution for the challenge. On the other hand, digital image steganography is the concealing of a message within an image file. The secret message can be retrieved afterwards by the author to check the image file for its veracity. This research paper proposes Sabiomha, an image forgery technique that make use of image steganography. The proposed technique is also supported by a software tool to demonstrate its usefulness. Sabiomha works by inserting an invisible watermark to certain alpha bits of the image file. The watermark we have used to steganograph an image is composed of a combination of text inputs the author can use to sign the image. Any attempts to tamper the image would distort the sequence of the bits of the image pixel. Hence, the proposed technique can easily validate originality of a digital image by exposing any tampering. The usability of our contribution is demonstrated by using the software tool we developed to automate the proposed technique. The experiment which we performed to further validate our technique suggested that Sabimoha could be flawlessly applied to image files.
Patent•
25 Oct 2018TL;DR: In this paper, a plurality of bits are moved from all channels of a first Red Green Blue Alpha (RGBA) space to an alpha channel of a second RGBA space.
Abstract: Methods and apparatus relating to techniques for provision of color mapping for better compression ratio are described. In an embodiment, a plurality of bits are moved from all channels of a first Red Green Blue Alpha (RGBA) space to an alpha channel of a second RGBA space. The plurality of the bits are selected from higher order bits of the first RGBA space. Other embodiments are also disclosed and claimed.
Patent•
23 Nov 2018
TL;DR: In this article, a video data transmission method was proposed, in which the server received data comprising YUV channel data and Alpha channel information, the YUV Channel data was decoded to obtain RGB format data, and the RGB format was processed by using the Alpha Channel information to adjust the foreground image of a displayed target image.
Abstract: Embodiments of the invention disclose a video data transmission method, wherein the server received data comprises YUV channel data and Alpha channel information, the YUV channel data is decoded to obtain RGB format data, and the RGB format data is processed by using the Alpha channel information to adjust the foreground image of a displayed target image, so that the foreground image of the targetimage may be better fitted on the whole background displayed by the display, and the user may obtain better immersion The method provided by the embodiments of the invention comprises: the terminalacquires the image data of a target object, wherein the image data comprises the RGB format data and the Alpha channel information; the terminal encodes the RGB format data to obtain YUV channel data;the terminal adds the Alpha channel information in the YUV channel data to obtain encoded data; and the terminal sends the encoded data to the server, wherein the encoded data is used for decoding ofthe server and the image display of the target object
Patent•
31 Aug 2018
TL;DR: In this paper, an Alpha channel transmission method was proposed, which comprises the following steps: converting RGB data of each pixel of an image into first YVVA data of every pixel of the image, encoding the data in a YUV420 way, and after transmitting the second YUVA data to a receiving end, converting the second RGB data into the RGB data in the RGBA way.
Abstract: The invention provides an Alpha channel transmission method. The method comprises the following steps: converting RGB data of each pixel of an image into first YVVA data of each pixel of the image; encoding the data in a YUV420 way in a YUV422 encoding way so as to obtain the second YUVA data; and after transmitting the second YUVA data to a receiving end, converting the second YUVA data into thedata in the RGBA way. The embodiment of the invention further provides an Alpha channel transmission device, a terminal device and a computer readable storage medium. By using the transmission methodprovided by the embodiment of the invention, an operation of the Alpha channel transmission can be optimized, and the user experience is improved.
Patent•
20 Jul 2018
TL;DR: In this paper, an image data processing method consisting of extracting a target image from the RGB image if an RGB image formed by the conversion of a collected YUV coded image comprises an extracted image target, carrying out the coding of the target image, and obtaining to be-transmitted image data, wherein the to-be-trans transmitted image data comprises the data at the YUV422 plane format and alpha channel data.
Abstract: The invention provides an image data processing method and device, a computer device, and a readable storage medium The image data processing method comprises the steps: extracting a target image from the RGB image if an RGB image formed by the conversion of a collected YUV coded image comprises an extracted image target; carrying out the coding of the target image, and obtaining to-be-transmitted image data, wherein the to-be-transmitted image data comprises the data at the YUV422 plane format and alpha channel data The method can reduce the bandwidth of image data transmission of a conventional virtual scene or 360-degree panoramic video, and increases the information in the transmitted image data