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I'm a c# developer, i always use this pdf to image converter http://www.xspdf.com/ guide/ pdf -jpg- converting / to convert pdf to jpg in c# language. The basic idea of FEC is to add redundant information to the original packet stream For the cost of marginally increasing the transmission rate of the audio of the stream, the redundant information can be used to reconstruct "approximations" or exact versions of some of the lost packets Following [Bolot 1996] and [Perkins 1998], we now outline two FEC mechanisms The first mechanism sends a redundant encoded chunk after every n chunks The redundant chunk is obtained by exclusive OR-ing the n original chunks [Shacham 1990] In this manner if any one packet of the group of n+1 packets is lost, the receiver can fully reconstruct the lost packet But if two or more packets in a group are lost, ther receiver cannot reconstuct the lost packets By keeping n+1, the group size, small, a large fraction of the lost packets can be recovered when loss is not excessive However, the smaller the group size, the greater the relative increase of the transmission rate of the audio stream In particular, the transmission rate increases by a factor of 1/n; for example, if n=3, then the transmission rate increases by 33% Furthermore, this simple scheme increases the playout delay because the receiver must receive the entire group of packets before it can playout a group (During a talkspurt, the receiver schedules periodic playback of the chunks based on the worst-case scenario - namely, the first packet in a group is lost within some group This requires the receiver to delay playback of each packet for the time it takes to receive an entire group) The second FEC mechanism to send a lower quality audio stream as the redundant information For example, the sender creates a nominal audio stream and a corresponding low-bit rate audio stream (The nominal stream could be a PCM encoding at 64 Kbps and the lower-quality stream could be a GSM encoding at 13 Kbps) The low-bit rate stream is referred to as the redundant stream As shown in Figure 63-2, the sender constructs the nth packet by taking the nth chunk from the nominal stream and appending to it the (n-1)st chunk from the redundant stream In this manner, whenever there is non-consecutive packet loss, the receiver can conceal the loss by playing out the low-bit-rate encoded chunk that arrives with the subsequent packet Of course, low-bit-rate chunks give lower quality than the nominal chunks; but a stream of mostly high-quality chunks, occasional low-quality chunks and no missing chunks gives good overall audio quality Note that in this scheme, the receiver only has to receive two packets before playback, so that the increased playout delay is small Furthermore, if the low-bit-rate encoding is much less than the nominal encoding, then the marginal increase in the transmission rate is small. display first page of pdf as image in c#: Convert PDF file to images using GhostScript in C# | The ASP.NET ... pdf to image c# free How To Convert PDF to Image Using Ghostscript API - CodeProject
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In this C# tutorial you will learn to display images in cells of a table in PDF document. ... table in design ... To create an image object you can use the Jpeg class of iTextSharp . s ... Get information of PDF document · Import pages from PDF document · Add content to an existing PDF document · Insert pages to an existing PDF ... Figure 63-2: Piggybacking lower-quality redundant information In order to cope with non-consecutive loss, a simple variation can be employed Instead of appending just the (n-1)st low-bit-rate chunk to the nth nominal chunk, the sender can append the (n-1)st and (n-2)nd low-bit-rate chunk, or append the (n-1)st and (n-3)rd low-bit-rate chunk, etc By appending more low-bit-rate chunks to each nominal chunk, the audio quality at the receiver becomes acceptable for a wider variety of harsh besteffort environments On the otherhand, the additional chunks increase the transmission bandwidth and the playout delay Free Phone and RAT are well-documented Internet phone application that uses FEC They can transmit lower-quality audio streams along with the nominal audio stream, as described above Interleaving As an alternative to redundant transmission, an Internet phone application can send interleaved audio As shown in Figure 63-3, the sender resequences units of audio data before transmission, so that originally adjacent units are separated by a certain distance in the transmitted stream Interleaving reduces the effect of packet losses If, for example, units are 5 ms in length and chunks are 20 ms (ie, 4 units per chunk), then the first chunk could contain units 1, 5, 9, 13; the second chunk could contain units 2, 6, 10, 14; and so on Figure 63-3 shows that the loss of a single packet from an interleaved stream results in multiple small gaps in the reconstructed stream, as opposed to the single large gap which would occur in a noninterleaved stream c# itextsharp convert pdf to image How To Convert PDF to Image Using Ghostscript API - CodeProject
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