In information theory, entropy encoding is a lossless data compression scheme that is independent of the specific characteristics of the medium. One of the main types of entropy coding creates and assigns a unique prefix code to each unique symbol that occurs in the input. These entropy encoders...
例子1 如上图所示,先用touch命令创建一个新文件file1,然后使用gzip压缩该文件。 例子2 如上图所示,先用cp命令将/etc/services文件复制到/root目录下并改名为file2,通过ls -l 命令可见该文件的大小为670293B,然后通过gzip命令将file2文件压缩,此时压缩文件的大小为136085B,可见压缩后文件的体积明显减小。 gunzip ...
Data from the file or files is loaded into the target table, one line per row. The fields in the data file are matched to table columns in order, left to right. Fields in the data files can be fixed-width or character delimited; the default delimiter is a pipe (|). By default, al...
most common types of compression algorithms are lossless and lossy. Lossless algorithms do not diminish image or document quality in the reduction process and retain all original information. Lossy algorithms can reduce overall quality but create even smaller file sizes by further compressing the data....
Some custom origins can also compress objects. Your origin might be able to compress objects that CloudFront doesn’t compress (seeFile types that CloudFront compresses). If your origin returns a compressed object to CloudFront, CloudFront detects that the object is compressed based on the presence...
# .PCD v0.7 - Point Cloud Data file format //注释,说明PCD文件的版本 VERSION 0.7 //PCD文件的版本号 FIELDS x y z //每个点应该包含那些维度信息,xyz表示xyz三维坐标,后面可添加rgb(表示颜色)、intensity(表示激光反射强度)、timestamp(表示时间戳)、normal_x/normal_y/normal_z(表示平面法线三维坐标)、...
uncompress [-cv] [-bbits] [file...] Description Theuncompressutility restores the compressedfilesto their original form, renaming the files by deleting the ".Z" extension. If renamingfilewould cause files to be overwritten and the standard input device is a terminal, the user is prompted (on...
Themyisampackutility compressesMyISAMtables.myisampackworks by compressing each column in the table separately. Usually,myisampackpacks the data file 40% to 70%. When the table is used later, the server reads into memory the information needed to decompress columns. This results in much better...
METHOD AND SYSTEM FOR STORING AUDIO FILE (S1); when a playing progress with respect to the audio data reaches a preset end point, performing compression on the cached PCM audio data according to a set audio file format (S2); and storing the compressed PCM audio data in... S Zhao 被引...
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