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The eld of image and video compression is extensive andhasbeenwell-exploredoverthepastfewdecades,rang-ing from lossless image formats (PNG, TIFF), to lossy im-age codecs (JPEG, BPG), to video codecs (AVC/H.264, HEVC/H.265). In recent years, there has been a rapid in-crease in learned image and video compression methods 37,1,2,21,34,45,30,17,10.
Adobe PDF Compression
A PDF created using CutePDF (which I understand isn't the most efficient method of PDF creation) is only 176kb. That's a 25% compression ratio. When those files are placed into a compressed folder, the PDF is capable of 3% compression where the.docx can only take 2%. I'm sure that larger files would have even greater differences in size. Shrink PDF online, free. The goal of every business organization is to work with small files and avoid the bulky ones. Digitalization is the solution to get rid of the paper based files. The need to use the shrink PDF online, free systems means that the PDF formats for scanning is used. Video monitoring and simultaneous recording in real-time as well as flexible configurations for those. Supports H.265 and H.264 video compression and M-JPEG still image compression algorithms. Supports 4-stage video compression rate and multiple compression resolutions. Two-way audio communication support for remote audio dialog.
The PDF (portable document format) format was developed in 1993 by Adobe Systems. Since then, it has become the preferred format for document exchange. Because of this, many Adobe PDF compression software products have been developed to ensure that Adobe PDF files are small enough for convenient emailing, web viewing, and storage. Since so many Adobe PDF compression products exist, it can be difficult to navigate the market and find the product that best suits your needs. However, a little knowledge will help you understand the main features that a given Adobe PDF compression software offers.
Adobe PDF Compression Basics
The compression of an Adobe PDF file begins with PDF compression software. While it is possible to use methods such as ZIP for Adobe PDF compression, the best results can only be achieved with PDF-specific compression software. While there are several algorithms used for Adobe PDF compression, all algorithms are either lossless or lossy. Lossy algorithms work by reducing the resolution or fidelity of high-bit content in PDF files, but is capable of achieving the highest possible compression rates. Lossless compression is preferred when it is necessary to retain the fidelity of the original file, as it results in no loss of quality. Good PDF compression software will offer both a lossless and a lossy algorithm so that the user can choose based on the Adobe PDF files being compressed. High-end Adobe PDF compression products will also offer a batch processing mode for large Adobe PDF compression jobs.
CVISION's Adobe PDF File Compression Software
CVISION Technologies offers the leading compression software for Adobe PDF files: PdfCompressor. PdfCompressor utilizes the new JPEG2000 and JBIG2 algorithms for both lossless and lossy Adobe PDF Compression. In addition, it includes a batch mode, and includes the most accurate OCR engine on the market. PdfCompressor will also convert 15 file types to Adobe PDF. You can download a free trial version by clicking the download button above.
PDF compression
In iTextSharp, you can use the CompressionLevel property of the PdfWriter class to set the compression level of stream objects that are written to the FileStream. You can specify one compression option from the table below.
| Option | Percentage reduced (in file size) |
| Compression level 0 (no compression) | 0% |
| Default compression | 72.30% |
| Compression level 9 ( best compression) | 72.59% |
| Full compression | 77.41% |
The compression level 0, default compression, and compression level 9 can be specified by using constant values defined in the PdfStream class: NO_COMPRESSION (0), DEFAULT_COMPRESSION (-1) , and BEST_COMPRESSION (9). You will use the SetFullCompression method of the PdfWriter class to use the full compression option.
var doc = new Document();
PdfWriter writer=PdfWriter.GetInstance(doc, new FileStream(path + 'pdfdoc.pdf', FileMode.Create));
writer.CompressionLevel = PdfStream.DEFAULT_COMPRESSION;
Image img = Image.GetInstance('D:/baby.jpg');
doc.Open();
doc.Add(img);
doc.Add(new Paragraph(0,'Hello World',new Font(Font.FontFamily.COURIER,50,Font.BOLD)));
doc.Close();
Compressing and decompressing an existing PDF file
The following code helps you compress an existing PDF document. You can use the GetPageContent method to get the content stream of a page, and the SetPageContent method to put it back. By doing this, iTextSharp thinks the stream has changed, and it will use the compression level that was defined for writer object of the PdfStamper.
PdfReader reader = new PdfReader('D:/pdfcontentadded.pdf');
PdfStamper stamper = new PdfStamper(reader, new FileStream('d:/pdfdoccompressed.pdf',FileMode.Create), PdfWriter.VERSION_1_5);
int pageNum = reader.NumberOfPages;
for (int i = 1; i <= pageNum; i++)
{
reader.SetPageContent(i, reader.GetPageContent(i));
}
stamper.SetFullCompression();
stamper.Close();
This is the Pdf file before being compressed.
This is the Pdf file after being compressed.
To decompress a PDF file, you will set the compress level of the writer object of PdfStamper to NO_COMPRESSION or zero.
PdfReader reader = new PdfReader('D:/pdfcompressed.pdf');
PdfStamper stamper = new PdfStamper(reader, new FileStream('d:/pdfdocdecompressed.pdf', FileMode.Create), PdfWriter.VERSION_1_5);
stamper.Writer.CompressionLevel = 0;
stamper.Close();
Comments
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Incremental Potential Contact:
Intersection- and Inversion-free Large Deformation Dynamics
Intersection- and Inversion-free Large Deformation Dynamics
Minchen Li1,2, Zachary Ferguson3
Squeeze 11 1 0 – Extensive Video Compression Toolkit Pdf Free
, Teseo Schneider3, Timothy Langlois2, Denis Zorin3, Daniele Panozzo3,Chenfanfu Jiang1, Danny M. Kaufman2
1University of Pennsylvania, 2Adobe Research, 3New York University
Squeeze out: Incremental Potential Contact (IPC) enables high-rate time stepping, here with h = 0.01s, of extreme nonlinear elastodynamics with contact that is intersection- and inversion-free at all time steps, irrespective of the degree of compression and contact. Here a plate compresses and then forces a collection of complex soft elastic FE models (181K tetrahedra in total, with a neo-Hookean material) through a thin, codimensional obstacle tube. The models are then compressed entirely together forming a tight mush to fit through the gap and then once through they cleanly separate into a stable pile.
Paper (PDF) Low res (PDF)
Contacts weave through every aspect of our physical world, from daily household chores to acts of nature. Modeling and predictive computation of these phenomena for solid mechanics is important to every discipline concerned with the motion of mechanical systems, including engineering and animation. Nevertheless, efficiently time-stepping accurate and consistent simulations of real-world contacting elastica remains an outstanding computational challenge. To model the complex interaction of deforming solids in contact we propose Incremental Potential Contact (IPC) – a new model and algorithm for variationally solving implicitly time-stepped nonlinear elastodynamics. IPC maintains an intersection- and inversion-free trajectory regardless of material parameters, time step sizes, impact velocities, severity of deformation, or boundary conditions enforced.
Constructed with a custom nonlinear solver, IPC enables efficient resolution of time-stepping problems with separate, user-exposed accuracy tolerances that allow independent specification of the physical accuracy of the dynamics and the geometric accuracy of surface-to-surface conformation. This enables users to decouple, as needed per application, desired accuracies for a simulation’s dynamics and geometry.
The resulting time stepper solves contact problems that are intersectionfree (and thus robust), inversion-free, efficient (at speeds comparable to or faster than available methods that lack both convergence and feasibility), and accurate (solved to user-specified accuracies). To our knowledge this is the first implicit time-stepping method, across both the engineering and graphics literature that can consistently enforce these guarantees as we vary simulation parameters.
In an extensive comparison of available simulation methods, research libraries and commercial codes we confirm that available engineering and computer graphics methods, while each succeeding admirably in custom-tuned regimes, often fail with instabilities, egregious constraint violations and/or inaccurate and implausible solutions, as we vary input materials, contact numbers and time step. We also exercise IPC across a wide range of existing and new benchmark tests and demonstrate its accurate solution over a broad sweep of reasonable time-step sizes and beyond (up to h=2s) across challenging large-deformation, large-contact stress-test scenarios with meshes composed of up to 2.3M tetrahedra and processing up to 498K contacts per time step. For applications requiring high-accuracy we demonstrate tight convergence on all measures. While, for applications requiring lower accuracies, e.g. animation, we confirm IPC can ensure feasibility and plausibility even when specified tolerances are lowered for efficiency.
Main video (MP4, 126 MB)
Supplemental Video (MP4, 64.7 MB)
CodebaseToolkit
@article{Li2020IPC,
author = {Minchen Li and Zachary Ferguson and Teseo Schneider and Timothy Langlois and
Denis Zorin and Daniele Panozzo and Chenfanfu Jiang and Danny M. Kaufman},
title = {Incremental Potential Contact: Intersection- and Inversion-free Large Deformation Dynamics},
journal = {ACM Transactions on Graphics},
year = {2020},
volume = {39},
number = {4}
}
Supplement A: Technical Details (PDF)
Supplement B: Comparison Details (PDF)
Supplement C: Statistics (PDF)
High-speed impact test: Top: we show key frames from a highspeed video capture of a foam practice ball fired at a fixed plate. Youtube video converter to mp3 for mac free download. Matching reported material properties (0.04m diameter, E = 107Pa, ν = 0.45, ρ = 1150kg/m3) and firing speed (v0 = 67m/s), we apply IPC to simulate the set-up with Newmark time stepping at h = 2e−5s to capture the highfrequency behaviors. Middle and bottom: IPC-simulated frames at times corresponding to the video frames showing respectively, visualization of the simulated velocity magnitudes (middle) and geometry (bottom).
Squeeze 11 1 0 – Extensive Video Compression Toolkit Pdf Reader
Squishy ball scaling test: Simulated by IPC, an elastic squishy ball toy model (688K nodes, 2.3M tets) is thrown at a glass wall. The left three frames show side views before, at, and after the moment of maximal compression during impact. The right-most frame then shows the view behind the glass during the moment of maximal compression, highlighting how all of the toy’s intricately intertwined tendrils remain intersection free.
Squeeze 11 1 0 – Extensive Video Compression Toolkit Pdf File
Codimensional collision tests: Here we simulate collisions with codimensional moving obstacles using only the mesh edge segments (left) or even just the mesh vertices (right) for the rotating roller. For these extremely challenging tests IPC continues robust simulation exhibiting tight compliant shapes in contact regions pressed by the sharp obstacles.
Squeeze 11 1 0 – Extensive Video Compression Toolkit Pdf Download
