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1、单击此处编辑主标题,单击此处编辑副标题,单击此处编辑标题,正文部分样例A正文部分样例B正文部分样例C正文部分样例D正文部分样例I正文部分样例II正文部分样例III,单击此处编辑标题,正文部分样例A正文部分样例B正文部分样例C正文部分样例D正文部分样例I正文部分样例II正文部分样例III,单击此处编辑标题,正文部分样例A正文部分样例B正文部分样例C正文部分样例D正文部分样例I正文部分样例II正文部分样例III,正文标题,第一级第二级 第三级第四级第五级,正文标题,第一级第二级 第三级第四级第五级,正文标题,第一级第二级 第三级第四级第五级,样例文本A,Gemmi Cong 精美PPT模板尽在如下
2、豆单欢迎大家欣赏和下载,样例文本A,Gemmi Cong 精美PPT模板尽在如下豆单欢迎大家欣赏和下载,样例文本A,Gemmi Cong 精美PPT模板尽在如下豆单欢迎大家欣赏和下载,样例文本B,熵编码是无损数据压缩的一个特别形式。它牵涉到将图像成份以Z字体（zigzag）排列，把相似频率组群在一起（矩阵中往左上方向是越低频率之系数，往右下较方向是较高频率之系数），插入长度编码的零，且接着对剩下的使用霍夫曼编码。JPEG标准也允许（但是并不要求）在数学上优于霍夫曼编码的算术编码之使用。然而，这个特色几乎很少被使用，因为它被专利所涵盖，且它相较于霍夫曼编码在编码和解码上会更慢。使用算术编码一般会
3、让文件更小约5%。对于前者量化的系数所作的Z字体串行会是：26,3,0,3,3,6,2,4,1 4,1,1,5,1,2,1,1,1,2,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0当剩下的所有系数都是零，对于过早退出的串行，JPEG有一个特别的霍夫曼编码用词。使用这个特殊的编码用词，EOB，该串行变为,样例文本B,熵编码是无损数据压缩的一个特别形式。它牵涉到将图像成份以Z字体（zigzag）排列，把相似频率组群在一起（矩阵中往左上方向是越低频率之系数，往右下较方
4、向是较高频率之系数），插入长度编码的零，且接着对剩下的使用霍夫曼编码。JPEG标准也允许（但是并不要求）在数学上优于霍夫曼编码的算术编码之使用。然而，这个特色几乎很少被使用，因为它被专利所涵盖，且它相较于霍夫曼编码在编码和解码上会更慢。使用算术编码一般会让文件更小约5%。对于前者量化的系数所作的Z字体串行会是：26,3,0,3,3,6,2,4,1 4,1,1,5,1,2,1,1,1,2,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0当剩下的所有系数都是零，对于过早
5、退出的串行，JPEG有一个特别的霍夫曼编码用词。使用这个特殊的编码用词，EOB，该串行变为,样例文本C,The compression method is usually lossy,meaning that some original image information is lost and cannot be restored,possibly affecting image quality.There is an optional lossless mode defined in the JPEG standard;however,that mode is not widely sup
6、ported in products.There is also an interlaced Progressive JPEG format,in which data is compressed in multiple passes of progressively higher detail.This is ideal for large images that will be displayed while downloading over a slow connection,allowing a reasonable preview after receiving only a por
7、tion of the data.However,progressive JPEGs are not as widely supportedcitation needed,and even some software which does support them(such as some versions of Internet Explorer)only displays the image once it has been completely downloaded.There are also many medical imaging and traffic systems that
8、create and process 12-bit JPEG images,normally grayscale images.The 12-bit JPEG format has been part of the JPEG specification for some time,but again,this format is not as widely supported.,样例文本C,The compression method is usually lossy,meaning that some original image information is lost and cannot
9、 be restored,possibly affecting image quality.There is an optional lossless mode defined in the JPEG standard;however,that mode is not widely supported in products.There is also an interlaced Progressive JPEG format,in which data is compressed in multiple passes of progressively higher detail.This i
10、s ideal for large images that will be displayed while downloading over a slow connection,allowing a reasonable preview after receiving only a portion of the data.However,progressive JPEGs are not as widely supportedcitation needed,and even some software which does support them(such as some versions
11、of Internet Explorer)only displays the image once it has been completely downloaded.There are also many medical imaging and traffic systems that create and process 12-bit JPEG images,normally grayscale images.The 12-bit JPEG format has been part of the JPEG specification for some time,but again,this
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