The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper an adaptive feedback based Reversible Watermarking (RW) algorithm using Difference Expansion (DE) is designed for gray-scale still pictures. The algorithm obtains automatically the highest payload size and the corresponding embedding threshold and also determines the best watermarked picture for an input cover picture with respect to the quality metric Peak-Signal-to-Noise Ratio (PSNR)...
In this paper, we propose a novel depth map coding scheme based on adaptive block compressive sensing. Different from the traditional two-dimensional image compression, edge information is more significant for the reconstruction of a depth map. Therefore, in view of the object boundaries characteristics of a depth map, we first divide the whole depth image into blocks with different sizes. Then according...
This work presents a new adaptive technique for image compression based on Discrete Wavelet Transform (DWT) and Radial Basis Function Neural Networks (RBFNN). The technique can be employed both for lossless and lossy (higher) compression and has been devised in order to deal effectively with a large variety of images. Proposed solution performs well both in terms of computing time and memory. Its...
The Hybrid encoder is trying to choose the better encoder between the Wavelet Difference Reduction (Type-W) and Simple Bit-plane (Type-B) to get the better results than pure Type-W or pure Type-B was proposed in previous research. In case that the most pixels are insignificant, Type-B will generate a long consecutive sequence of zero bits. By experimental results, the Modified Simple Bit-plane which...
The article is devoted to the instrumental means of the design of video data link, which are mounted on board the aircraft. The information concerning the possibilities of the program model use for the choice of the basic hosts and image translation options via physical "channel with gaps" is given in the article.
Context: energy consumption represents an important issue with limited and embedded devices. Such devices, e.g. Smartphones, process many images, both to render the UI and for application specific purposes. Goal: we aim to evaluate the energy consumption of different image encoding/decoding algorithms. Method: we run a series of experiments on a ARM based platform, and we collected the energy consumed...
With rapid increase of image resolution in modern video processing and display systems, the bandwidth and power consumption of external memory are becoming serious bottlenecks. This problem can be alleviated by high-fidelity embedded compression (EC) techniques for video frame buffers. Classic lossless or near-lossless coding methods like CALIC are ill suited for embedded systems due to their high...
In this paper, we investigate the robustness achieved by hard-input hard-output (HIHO) turbo product code (TPC) in a grayscale image watermarking. The TPC scheme is based on the concatenation of a BCH product code. The general concept of the TPC is to construct two or more simple codes in order to achieve remarkable error performance. Unlike many proposed algorithms in the literature, HIHO-TPC require...
Distributed video coding (DVC) is a recent paradigm of video coding, based on distributed source coding and side information (SI) generated at the Decoder. Most of the DVC schemes are using complex channel codes such as LDPC or Turbo codes, which are increasing the decoder complexity and delay. Many searches have been done to simplfy the coding schemes, one of them was done by replacing the channel...
The amount of generated screen content sequences has recently increased due to the high popularity of multimedia services such as videoconferencing and cloud video gaming. Screen content sequences are characterized by a high number of sharp edges and repeating patterns, which are difficult to compress using current video coding tools. This paper proposes improvements to lossless compression of these...
The Intra Block Copy (IntraBC) is a newly adopted tool in the HEVC extension for the screen content video coding. The IntraBC tool efficiently encodes repeating patterns in a picture. The current IntraBC scheme achieves about 1.0% bit-rate reduction on average and up to 4.3% bitrate reduction on natural content video for a database consisting of 2K, 4K, and 8K sequences. In this paper, we propose...
Multi-view video plus depth is emerging as the most flexible format for 3D video representation, as witnessed by the current standardization efforts by ISO and ITU. The depth information allows synthesizing virtual view points, and for its compression various techniques have been proposed. We make a preliminary investigation of the effects on the synthesized views of two different approaches: object-based...
For storing and transmitting data from one end to another, size of the data should be reduced in size for better bandwidth and increase speed of device. Online compression is in great demand as more and more of the work is on online platform. Numerous static compression methods are there but they are time consuming and require complete data before compression. It requires two pass compressions but...
Multimedia communications over best-effort networks often involve situations in which immediate data retransmission is either impossible (e.g., network congestion or broadcast applications) or undesirable (e.g., conversational applications with very low delay requirements). A specific solution developed for increasing the transmission reliability without increasing the delay is known as multiple description...
Subband decomposition is widely used in signal processing applications including image and speech compression. In this paper, we present Perfect Reconstruction (PR) polyphase filter bank structures in which the filters adapt to the changing input conditions. This leads to higher compression results for images containing sharp edges such as fingerprint images. The fingerprint image compression is an...
An embedded coding algorithm creates a compressed bit stream which can be truncated to produce reduced resolution versions of the original image. This property allows such algorithms to precisely achieve fixed bit rates, reducing or eliminating the need for rate control in video transmission applications. Unfortunately, a large amount of scratch memory is required for embedded coding, making it difficult...
This paper proposes a novel algorithm for fractal coding of color image sequence, based on the extended CPM (Circular Prediction Mapping). In the extended CPM, each range block is approximated by a domain block in the adjacent frame, which is of the same size as the range block. Therefore the proposed domain-range mapping is similar to the block matching algorithm in the motion compensation techniques,...
This paper applies the quadtree structure for image coding. The goal is to adapt the block size and thus to increase the compression ratio (without reducing SNR). Also, the computational time is not significatively increased. It has been applied to Block Truncation Coding of still images, and motion vector coding (interframe). An inter/intraframe application is also discussed.
In the era of cloud computing, there are many correlated images in the cloud, joint compression of these images may provide much higher compression ratio than individual coding. Model-based coding is an appealing approach to image coding in the cloud, as it removes knowledge redundancy among images that share the same model. In this paper, we make an attempt to model-based image coding for landmark...
In this paper, we propose a novel image compression approach towards visual quality rather than pixel fidelity. We intentionally remove several blocks at the encoder and reconstruct them at the decoder to get bits reduction. The removal blocks are wisely and adaptively selected based on blocks clustering, patch similarity and removal priority. A well-suited similarity measurement is defined to capture...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.