compression   17658

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A Time-Series Compression Technique and its Application to the Smart Grid
Time-series data is increasingly collected in many domains. One example is the smart electricity infrastructure, which generates huge volumes of such data from sources such as smart electricity meters. Although today this data is used for visualization and billing in mostly 15-min resolution, its original temporal resolution frequently is more fine-grained, e.g., seconds. This is useful for various analytical applications such as short-term forecasting, disaggregation and visualization. However, transmitting and storing huge amounts of such fine-grained data is prohibitively expensive in terms of storage space in many cases. In this article, we present a compression technique based on piecewise regres- sion and two methods which describe the performance of the compression. Although our technique is a general ap- proach for time-series compression, smart grids serve as our running example and as our evaluation scenario. Depending on the data and the use-case scenario, the technique com- presses data by ratios of up to factor 5,000 while maintain- ing its usefulness for analytics. The proposed technique has outperformed related work and has been applied to three real-world energy datasets in different scenarios. Finally, we show that the proposed compression technique can be imple- mented in a state-of-the-art database management system.
timeseries  compression  smartgrid  iot  internetofthings 
2 days ago by dlkinney
google/guetzli: Perceptual JPEG encoder
Guetzli is a JPEG encoder that aims for excellent compression density at high visual quality. Guetzli-generated images are typically 20-30% smaller than images of equivalent quality generated by libjpeg. Guetzli generates only sequential (nonprogressive) JPEGs due to faster decompression speeds they offer.
compression  google  graphics  jpeg  github 
3 days ago by bezthomas
ImageOptim online
JPEG and PNG compressors with special secret artisan-crafted settings
images  compression  jpeg  performance 
3 days ago by siggiarni
GitHub - google/guetzli: Perceptual JPEG encoder
Guetzli is a JPEG encoder that aims for excellent compression density at high visual quality. Guetzli-generated images are typically 20-30% smaller than images of equivalent quality generated by libjpeg. Guetzli generates only sequential (nonprogressive) JPEGs due to faster decompression speeds they offer.
jpg  compression 
4 days ago by astroud
Google Wants to Make Your Images Take Up Less Space
The project is an image encoder called Guetzli (which is Swiss German for cookie; the project was born out of Google Research’s Zurich office). In addition to making image files that are smaller, Guetzli is also focused on creating images that look better than other compressed images, too.
google  images  graphics  jpeg  compression 
5 days ago by pfhyper
Using MozJPEG via Docker · ariya.io
MozJPEG, a JPEG encoder project from Mozilla, is a fantastic way to optimize your JPEG files. Setting it up however might be quite a hassle. Fortunately, a virtualized environment such as Docker offers a much simplified way to use MozJPEG.
mozilla  compression  jpeg  docker 
6 days ago by siggiarni
Guetzli: A New Open Source JPEG Encoder
Guetzli is a JPEG encoder that aims for excellent compression density at high visual quality. Guetzli-generated images are typically 20-30% smaller than images of equivalent quality generated by libjpeg. Guetzli generates only sequential (nonprogressive) JPEGs due to faster decompression speeds they offer.
jpeg  guetzli  compression  image 
6 days ago by lidel

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