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Next generations of still image codecs should not only have to be efficient in terms of compression ratio, but also propose other functionalities such as scalability, lossy and lossless capabilities, region-of-interest coding, etc. In previous works, we have proposed a scalable compression method called LAR, for Locally Adaptive Resolution, that covers these requirements. In particular, the Interleaved...
Human visual system is more sensitive to luminance than to chrominance. In order to reduce information that is not perceived by human visual system, color channels are downsampled while keeping luminance as original. Similarly in stereo case, human visual system uses high frequency information from the high resolution image of the mixed resolution image pair. By downsampling one of the pair, higher...
There has been a rapid increase in audio-visual information in digital form with the ever-increasing popularity of the Internet. The Moving Pictures Expert Group has recently presented a video compression and content manipulation standard, called MPEG-4 [1]. This was developed in response to the growing need for a coding method that can facilitate access to visual objects in natural and synthetic...
The paper describes a very simple technique for compression of chrominance data in colour images and video sequences coded at low bit rates. The technique is based on coding of arbitrarily shaped regions, whereby each region is efficiently represented by one value of chrominance which is averaged over the whole region. As the regions are determined on the basis of reconstructed luminance component,...
The colour spaces supported by the different image and video coding standards are presented in the present communication. Extensive reference to the colour spaces and the relevant colour descriptors supported by the MPEG-7 standard is given, and experiments on colour-based image retrieval efficiency are illustrated.
Common e-commerce websites rely heavily on JPEG images for product presentation. In this paper we present a new coding scheme and file format that is tailored to the presentation of single-color products. A JPEG image file can be transcoded into this new format leading to substantial reduction in file size (Average of 28%) with practically no quality degradation. We describe how we can take advantage...
In the digital watermarking with DCT method, the watermark is located within a range of DCT coefficients of the cover image. In this paper a new method is proposed by using a combination of the DCT and PCA transform in order to use the low-frequency band for the color image. First, the digital color image is transformed into YCbCr from RGB color space and the luminance (Y) component is divided into...
E-commerce websites rely heavily on JPEG images for product presentation. We describe a new coding scheme and file format that is tailored to the presentation of single-color products with multiple color choices: Instead of using multiple files of the same product at different colors, the new file format allows the transmission of all color choices in one file. On the decoder side images of the same...
We propose a quality enhancement algorithm for linear adaptive compression using bit plane reduction. Compression is based on the observation that least significant bit(LSB) planes can be removed without affecting the perceptual quality of the image. It also makes use of the fact that the bits in a bit plane repeat and hence can be compressed losslessly by encoding. At the receiver end, the quality...
Image saliency detection, which is aiming at locating meaningful objects in image and extracting the corresponding saliency map, has been attracting considerable attention. Most of existing saliency detection algorithms are dealing with uncompressed images, while numerous images are distributed and stored in JPEG format over Internet. Thus, this paper proposes a novel image saliency detection method...
Plenoptic images are obtained from cameras with internal microlens arrays. Nearby pixels in a plenoptic image are representing the real world from different spatial and angular position and the general assumption of spatial correlation exploited for the development of former image coding algorithms loses most of its foundations. In this work, the problem of coding plenoptic images is analyzed in order...
Currently, Reflectance Transformation Imaging (RTI) technology is restricted to desktop and high performance computing devices. In recent years, mobile devices and tablets have become ubiquitous due to their increased performance. However, the size of RTI files (≈100 MB) limits the range of portable devices capable of displaying RTI files. In this paper, we explore different compression techniques,...
Much research has been done to block objectionable images by analyzing the visual contents. The region-of-interest based approach are more accurate in describing the image content than the approach using the whole image in the field of content-based image retrieval. Therefore, this paper proposes a method for classifying objectionable images based on global features and salient region. By using the...
High Dynamic Range (HDR) imaging is able to capture a wide range of luminance values, closer to what the human visual system can perceive. It is believed by many that HDR is a technology that will revolutionize TV and cinema industry similar to how color television did. However, the complexity of HDR requires reinvention of the whole chain from capture to display. In this paper, HDR images compressed...
One of the first approaches to proposed to prevent automated attacks on Internet were the Human Interactive Proofs(HIPs). Since their invention, a variety of designs have been proposed, yet most of them have been successfully attacked. In this paper we focus on a new HIP, based on a puzzle solving scheme, created to increase both security and usability: the Capy CAPTCHA. We have analyzed its design,...
This paper presents a novel technique for efficient and generic matching of compressed video shots, through compact signatures extracted directly without decompression. The compact signature is based on the Dominant Color Profile (DCP), a sequence of dominant colors extracted and arranged as a sequence of spikes in analogy to the human retinal representation of a scene. The proposed signature represents...
In this paper we propose and evaluate a new technique that localizes the description ability of the well established MPEG-7 and MPEG-7-like global descriptors. We employ the SURF detector to define salient image patches of blob-like textures and use the MPEG-7 Scalable Color (SC), Color Layout (CL) and Edge Histogram (EH) descriptors and the global MPEG-7-like Color and Edge Directivity Descriptor...
Making films in 3D has become popular and successful by providing 3D effects. Even by providing more effects on top of the 3D effects, it is possible to provide more immersion in terms of user experience by adding sensory effects other than the traditional video and audio. Especially, 4D movies which includes sensory effects, such as wind, vibration, lighting, scent and so on, can stimulate human...
Major Fashion trends in the world have been set up from dominant groups of fashion players from the leading fashion countries which have soon become fashion trend setters affecting to fashion trend area in a wide range from important fashion books to major catwalk parades. However, the process of fashion trends setting in many countries still remain complex and unpredictable. In this research we have...
For efficient data management, we propose a system which generates metadata for image contents. This system is using Content-Based Image Retrieval System (CBIR) based on Mpeg-7 descriptors. First, low-level features are extracted from the query image without metadata and the images with similar low-level features are retrieved from the CBIR system. Metadata of the result images which are similar to...
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