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Plenoptic cameras which can capture both spatial and angular light information by one shot have attracted great interests. Compared with traditional cameras, a plenoptic image has large resolution and enormous amounts of microlens images. Due to huge volume of data, an efficient plenoptic image compression method for transmission and storage is required. In this paper, a novel plenoptic image compression...
This paper presents an acceleration method of the bilateral filter (BF) for multi-channel images. In most existing acceleration methods, the BF is approximated by an appropriate combination of convolutions. A major purpose under this framework is to achieve sufficient approximate accuracy by as few convolutions as possible. However, state-of-the-art methods for multi-channel images still requires...
Saliency detection as an image preprocessing has been widely used in many applications such as image segmentation. Since most images stored in DCT domain, we propose an effective saliency detection algorithm, which is mainly based on DCT and secondary quantization. Firstly, the DC coefficient and the first five AC coefficients are used to get the color saliency map. Then, through secondary quantization...
Due to the availability of different image processing tools, now-a-days Copy-move forgery is emerging immensely. Addressing this problem is being more deterrent because of different types of image post processing techniques. In this paper, we propose a robust approach to detect copy-move forgery detection which ensembles human vision information from color space of the image and moment invariants...
Voyage data recorder (VDR) is used to record vessels' navigation data. Image is one of the essential data recorded by VDR. According to International standard-IEC 61996, compared with the original image, the one recorded by VDR may contain color and position errors. In this paper, an improved position errors test method is proposed based on IEC 61996. An image which contains two colors, black and...
The dynamic range of the luminance of the scenes surrounding us are mostly very wide in all time of a day. High performance cameras were designed to capture these luminance with longer digits in their pixels. However, conventional displays can only render pixels with eight bits per channel, making the devices the bottleneck among the whole pipeline. As an effort to narrow this gap, this paper presents...
The research in the domain of image compression increased significantly where the requirements of transmission images have raised enormously. Image compression is very important in digital image processing. It plays a crucial role in efficient transmission and storage of images. The most widely used method of lossy compression is JPEG standard. In this paper, we will discuss the implementation of...
In this paper, we propose a method to separate diffuse and specular images from a single image based on sparse representation. The proposed method relax the recent sparse-based technique for removing specular highlights that require multiple input images. Instead, we use only a single input image and then generate multiple specular-free images from this image. The specular removal problem is formulated...
Multicolored Matrix (MCM) Code is a two-dimensional color coded matrix. It consists a sequence of images rendered at an optimum frame rate to transfer simple data between portable devices such as a mobile phone. We introduce an untried channel-less short range communication technology, designed with limitless storage capacity, great structural stability and flexibility due to which it can work in...
Region of interest means area of image that is to be selected or considered as important part of an image. Region of interest is selected in two different ways; first region is selected by user and second is system dependent selection. Instead of using system selection, user selection will be more effective because system selection can create difficulties while considering regions whereas user will...
Novel devices are able to capture intensity and directional information of the light field in a scene originating high data bitrates. Novel compression techniques are hence required for facilitating light field storage and transmission. This paper presents a study of the performances of a compression method based on light field preprocessing followed by high efficiency coding.
Image compression has wide area in image processing researches. It consists of minimizing the size in bytes of an image without degrading the quality to an unacceptable level. The reduction in file size allows more images to be stored in a given amount of disk or memory space. For this reason, many researches and compression techniques have been proposed; some of these have been effective in some...
In this research, presented an enhanced image security using improved RSA cryptography and Spatial Orientation Tree Wavelet compression (STW) method for color or grayscale image. Steganography is the science of hiding secret messages so that you can be sent to target without mistrust. It is the most famous type of carrier to grip data. Firstly, input the secret message, then encrypt the message using...
Map images are widely used in variety applications such as personal navigation, mobile computing, internet and academia. The usage of raster maps in many applications especially in small storage devices has negative impacts because of its relatively large size. The efficient use of compression method is essential to meet such requirements. A fast lossless compression scheme for raster map images is...
Traditional digital display devices, due to their hardware limitations, cannot represent the whole range of luminance in High Dynamic Range (HDR) images. In order to solve this incompatible problem, many tone mapping techniques were introduced to reproduce HDR images presently. Unlike one of the traditional work of art in [13], this paper proposes a fast and multi-scale decomposition based tone mapping...
The Discrete Cosine Transform (DCT) and the Graph Fourier Transform (GFT) are ones of the well-known image transform methods designed for images obtained by a single device. This paper proposes a hybrid image transform method designed for a pair of color and depth images. Based on the correlation between the images, the proposed method selects suitable transform either from the DCT or Color-depth...
Content-based image retrieval, which is based on the principle of deriving visual similarity based on extracted image features, can be useful, especially since most images are unannotated. However, while almost all images are stored in compressed form (most in JPEG format), the majority of CBIR algorithms operate in the uncompressed pixel domain. This not only leads to a computational overhead for...
We present a scheme for multi-sensor data fusion applications, called Relative Pose based Redundancy Removal (RPRR), that efficiently enhances the wireless channel utilization in bandwidth-constrained operational scenarios for RGB-D camera equipped visual sensor networks. Pairs of nodes cooperatively determine their own relative pose, and by using this knowledge they identify the correlated data related...
Visual textures like grass, water etc. consist of dense and random variations in contrast that are perceptually indistinguishable by a human eye. Such textures are costly to encode using image and video codecs. For example, in the state-of-the-art compression standard High Efficiency Video Coding (HEVC), detailed textures typically show relatively strong blurring artifacts at low rates (high QPs)...
We propose a color space transform for 4:4:4 video coding. The uncorrelated noise contained in specific color component deteriorates compression efficiency. The proposed transform can limit the propagation of the uncorrelated noise of the color component to other color components by introducing zero coefficients in a transform matrix. Simulation results show that the proposed transform improves image...
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