نتایج جستجو برای: تصویر jpeg

تعداد نتایج: 21751  

2006
Nein-Hsiung Lin Ting-Hao Huang Bing-Yu Chen Yung-Yu Chuang Ming Ouhyoung

For PC and even mobile devices, video and image streaming technologies, such as H.264 and JPEG/JPEG 2000, are already mature. However, the 3D model streaming technology is still far from practical use. Therefore, we wonder if 3D model streaming can directly benefit from current image and video streaming technologies. Hence, in this paper, we propose a mesh streaming method based on geometry ima...

Journal: :IEEE transactions on image processing : a publication of the IEEE Signal Processing Society 2000
Marcia G. Ramos Ricardo L. de Queiroz

This paper presents a modified JPEG coder that is applied to the compression of mixed documents (containing text, natural images, and graphics) for printing purposes. The modified JPEG coder proposed in this paper takes advantage of the distinct perceptually significant regions in these documents to achieve higher perceptual quality than the standard JPEG coder. The region-adaptivity is perform...

Journal: :IEEE transactions on image processing : a publication of the IEEE Signal Processing Society 1998
Ricardo L. de Queiroz

As the Joint Photographic Experts Group (JPEG) has become an international standard for image compression, we present techniques that allow the processing of an image in the "JPEG-compressed" domain. The goal is to reduce memory requirements while increasing speed by avoiding decompression and space domain operations. In each case, an effort is made to implement the minimum number of JPEG basic...

Journal: :Pattern Recognition 2006
Jiang-Lung Liu

In this paper, we propose an efficient selective encryption scheme for encrypting JPEG 2000 images. The proposed scheme uses a secret key and a mapping function to generate a private initial table to encrypt the selected DWT codeblocks in the entropy coding stage of JPEG 2000 coding scheme. Theoretical analysis and experimental results show that the proposed scheme can achieve various purposes ...

2011
Rakesh Kumar Tapesh Parashar

In this paper, image compression algorithms have reviewed for transmission over wireless networks. The performance evaluation is based on PNSR, bit-rate, computational complexity etc. and is evaluated using Advanced Image Coding software. It has observed that compression efficiences are reasonably comparable for the JPEG 2000 and AIC, which outperforms the conventional JPEG. Baseline JPEG 2000 ...

2000
Wenjun Zeng Scott Daly Shawmin Lei

In this paper, we review the various tools in JPEG-2000 that allow the users to take advantages of the various properties of the human visual system such as spatial frequency sensitivity and the visual masking effect. We show that the visual tool sets in JPEG-2000 are much richer than what was available in JPEG, where only locally invariant frequency weighting can be exploited

2017
Eddie Q. Yan Kaiyuan Zhang Xi Wang Karin Strauss Luis Ceze

Modern image storage services, especially those associated with social media services, host massive collections of images. These images are often replicated at many different resolutions to support different devices and contexts, incurring substantial capacity overheads. One approach to alleviate these overheads is to resize them at request time. However, this approach can be inefficient, as re...

Journal: :J. Visual Communication and Image Representation 2006
Li-Wei Kang Jin-Jang Leou

For an entropy-coded Joint Photographic Experts Group (JPEG) image, a transmission error in a codeword will not only affect the underlying codeword but also may affect subsequent codewords, resulting in a great degradation of the received image. In this study, an error resilient coding scheme for JPEG image transmission based on data embedding and side-match vector quantization (VQ) is proposed...

2004
Li Qi Robert J. Funnell

The efficient compression of medical images is important for improved storage and network utilization. The Joint Photographic Experts Group (JPEG) baseline compression algorithm has been widely used in medical image compression. In contrast, JPEG2000 is a relative new compression standard. The purpose of this study is to provide a quantitative comparison of JPEG and JPEG2000 compression effects...

Journal: :J. Visual Communication and Image Representation 2014
Roman Starosolski

We present simple color space transformations for lossless image compression and compare them with established transformations including RCT, YCoCg-R and with the optimal KLT for 3 sets of test images and for significantly different compression algorithms: JPEG-LS, JPEG2000 and JPEG XR. One of the transformations, RDgDb, which requires just 2 integer subtractions per image pixel, on average res...

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