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Clustering analysis, as a hot direction in the field of data mining, has attracted more and more attention in recent years. For the feature of the unsupervised data processing, the clustering analysis can be used to manage well mass media resources. It has applied in image segmentation and image retrieval system nowadays.
With the rapid development of computer vision and digital technology, producing the vast amounts of image data, how to realize a rapid, easy and high effective algorithm of image retrieval has been the issue of study, just so the main goal of this paper is to implement an effective improved algorithm based on color feature. There are two main types of algorithm based on color feature: global algorithm...
Compare with traditional 2D video, 3D video can provide viewers with more realistic stereo experiences because of the depth information. In the paper, a new objective quality assessment algorithm for 3D videos is proposed. And experiments show that it is more accurate than peak signal-to-noise (PSNR) and structural similarity index measurement (SSIM). According to human visual system (HVS), we abstract...
In the last few years, online video services have experienced great development. When we watching videos, we all want to get better watching experiences, but the delivery of the videos are restricted by Internet bandwidth. In order to get better video quality with limited Internet environment, people have formulated a lot of compression standards to make the size of video files smaller. But during...
The main goal of this paper is to find the relationship between video content complexity and the objective quality, further to compare H.265/HEVC, H.264/AVC, and VP9 encoders in three modes based on complexity of the video content. There are three evaluation metrics: Peak Signal to Noise Ratio (PSNR), structural similarity (SSIM), and encoding time, which were introduced to compare the three video...
This paper introduces a video codec evaluation system. The system can evaluate the performance of video codec by changing encoding parameters from different dimensions: video content, resolution, codec preset, and bitrate. For each encoder, the system can enumerate all kinds of parameters above to encode test video sequences and then record codec's output video quality and time-consumption. Through...
In this paper we study the relationship between bit-per-pixel (bit/pixel), resolution and video quality based on H.264. First, we choose 4 most representative 1920x1080 progressive sequences depending on the TI and SI of them. Then, we process these sequences into 5 kinds of resolution and encode these sequences to 6 kinds of bit-per-pixel. Next we calculate SSIM between damaged sequence and original...
In the past two decades, despite an increase in the contraceptive prevalence rate over 90 per cent, the rate of induced abortions in China has also increased. Based on interviews with women from Beijing undergoing induced abortions and their partners, this study examines the reasons why. It finds that lack of knowledge of how to use methods correctly and/or the choice of lower efficacy methods were...
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