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One of the application in satellite communication is to capture and transmit high quality and hyper-spectral images back to the ground station. These images require very high bandwidth, more transmission time and large storage memory. Moreover, the link used for communication is susceptible to various noises. Hence, need for image compression with high compression ratio and channel encoding technique...
Computer vision is one of the most important branches in modern industrial technology. Image classification plays an important role in computer vision since it utilizes the most advance technique in this area. However, most image classification methods only use the SIFT feature for further processing, which hinders the rich useful low-level image attributes to be captured. This paper proposes a maximal...
The main objective of image compression is to diminish the number of bits required to represent an image by eliminating the spatial and spectral redundancies. Image compression is classified as lossy and lossless compression. Lossy compression reduces the size of a file by removing redundant information. Whereas, in the lossless compression there won't be any loss of information upon the extraction...
In this paper, we present a hash-based framework for acceleration of a block-based hybrid video encoder. The framework consists of a hash-based transform, a hash-based motion analysis, and a finial collaboration of the analysis information for different block sizes. The hash-based transform generates an image where each sample represents a complete block. Thus, in the hash-based motion analysis, only...
This paper proposes guided-colorization-based image coding that utilizes a guide image for encoding chroma components. Up to now, several colorization-based image coding techniques have been proposed. In those techniques, the luma component is encoded by a standard encoder, while the two chroma components by colorization. Namely, the encoder selects representative chroma samples and the decoder recovers...
This paper reports results of subjective and objective quality assessments of responses to a grand challenge on light field image compression. The goal of the challenge was to collect and evaluate new compression algorithms for light field images. In total seven proposals were received, out of which five were accepted for further evaluations. For objective evaluations, conventional metrics were used,...
A new technique for color quantization is suggested. First, pre-quantization is accomplished by means of spatial resolution reduction, then, color aggregation is accomplished based on the distance between colors in the color space. Color aggregation is an iterated process where the number of iterations is given by the difference between the number of colors of the pre-quantized image, and the number...
While Cryptography is the science of secure communication, Steganography is the art of covert communication. Steganography has a long history, but modern steganography uses digital carriers such as electronic text, disk space, network packets, digital audio and images to hide secrets. Steganalysis, the countermeasure to steganography, is designed to detect and analyse the hidden data disseminated...
This paper presents Reversible Color Transmission of Compressed Fragment -Visible Mosaic Image of the same size for hiding the secret image. By applying the digital watermarking on mosaic image using DWT and PCA transformation increase the security, authentication, copyright protection and all types of internet applications. Most commonly used methods of watermarking are discrete cosine transform...
The advent of efficient short range radio communication coupled with advancement in miniaturization of computing devices has enabled the development of wireless multimedia sensor network (WMSN). Energy is one of the scarcest resources in such networks, especially it is scarce in transmitting multimedia data. This work presents an energy-saving image compression scheme. The nodes in WMSN are equipped...
This paper proposes a hardware architecture for the newly introduced Better Portable Graphics (BPG) compression algorithm. Since its introduction in 1987, the Joint Photographic Experts Group (JPEG) graphics format has been the de facto choice for image compression. However, the new compression technique BPG outperforms JPEG in terms of compression quality and size of the compressed file. The objective...
This paper presents a new image feature descriptor derived from the Direct Binary Search Block Truncation Coding (DBSBTC) data-stream without requiring the decoding process. Three image feature descriptors, namely Color Autocorrellogram Feature (CAF), Legendre Chromaticity Moment Feature (LCMF), and Local Halftoning Pattern Feature (LHPF), are simply constructed from the DBSBTC min quantizer, max...
License Plate Recognition (LPR) is an automatic system which is able to recognize a license number plate. It is an effective monitoring method that uses optical character recognition (OCR) on images to read vehicle number plates. Genetic neural network used such type of system for developing many challenges. The system used in highway computerized toll aggregation and surveilling the movements of...
A new evaluation tool for generating attacks on watermarking algorithms is proposed. The tool is implemented for digital still images but additional attacks for audio or video can be added in the test environment continuously. The implemented tool is comprised of 23 different attacks using a graphical user interface (GUI) to open, select, attack, evaluate, and display the results of both the original...
This paper proposes two new intra prediction methods for color image compression, which exploit the correlation between the base and non-base colors. The first method predicts a pixel in non-base color as a weighted sum of neighboring pixels, where the weights are determined as a function of photometric distances from the pixel to the neighboring ones in the base color. The second exploits the linear...
In depth-image-based rendering (DIBR), a new virtual viewpoint image is synthesized by mapping color pixels from one or more reference views to the new image grid using corresponding disparity values. However, due to necessary roundings to the 2D grid, "rounding holes" appear in synthesized objects, which are typically filled using local interpolation. In this paper, leveraging on a recent...
This paper proposes a novel colorization-based color image coding method. This method segments an input image into small segments called superpixels and restores the chrominance of each superpixel as the linear transformation of its luminance. A lot of color image coding methods using colorization have been proposed, but no methods utilize a local correlation between the luminance component and the...
Tone mapping effectively produces high dynamic range images on low dynamic range displays. Global tone mapping is simple and fast because of using the same mapping curve for every pixel without considering its neighboring ones in the radiance map. However, it often loses fine details in an image with low dynamic range displays. In this paper, we propose detail-preserving tone mapping for low dynamic...
Detecting prior compression is an essential task in image forensics and can be used to detect forgery in digital images. Many approaches focus on grayscale images and assume compressions with a low quality factor which often leave visible artifacts in the image. In practice, however, color images and high quality compression are much more relevant and widespread. Block convergence has been proposed...
This paper compares the DXT and JPEG image compression techniques used in display wall solutions SAGE and DisplayCluster with hardware accelerated H.264 video encoding that is used in the display wall system developed by the authors of this paper. The obtained processing power usage and generated bandwidth measurements presented in this paper demonstrate that hardware accelerated H.264 encoding offers...
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