Optional parameters for the CCITTFaxDecode lter in Java

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TABLE 39 Optional parameters for the CCITTFaxDecode lter
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KEY TYPE VALUE
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A code identifying the encoding scheme used: <0 0 >0 Pure two-dimensional encoding (Group 4) Pure one-dimensional encoding (Group 3, 1-D) Mixed one- and two-dimensional encoding (Group 3, 2-D), in which a line encoded one-dimensionally can be followed by at most K 1 lines encoded two-dimensionally
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The lter distinguishes among negative, zero, and positive values of K to determine how to interpret the encoded data; however, it does not distinguish between different positive K values Default value: 0
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CHA P TE R 3
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Syntax
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EndOfLine
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boolean
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A ag indicating whether end-of-line bit patterns are required to be present in the encoding The CCITTFaxDecode lter always accepts end-of-line bit patterns, but requires them only if EndOfLine is true Default value: false A ag indicating whether the lter expects extra 0 bits before each encoded line so that the line begins on a byte boundary If true, the lter skips over encoded bits to begin decoding each line at a byte boundary If false, the lter does not expect extra bits in the encoded representation Default value: false The width of the image in pixels If the value is not a multiple of 8, the lter adjusts the width of the unencoded image to the next multiple of 8, so that each line starts on a byte boundary Default value: 1728 The height of the image in scan lines If the value is 0 or absent, the image s height is not predetermined, and the encoded data must be terminated by an end-of-block bit pattern or by the end of the lter s data Default value: 0 A ag indicating whether the lter expects the encoded data to be terminated by an end-of-block pattern, overriding the Rows parameter If false, the lter stops when it has decoded the number of lines indicated by Rows or when its data has been exhausted, whichever occurs rst The end-of-block pattern is the CCITT end-offacsimile-block (EOFB) or return-to-control (RTC) appropriate for the K parameter Default value: true A ag indicating whether 1 bits are to be interpreted as black pixels and 0 bits as white pixels, the reverse of the normal PDF convention for image data Default value: false The number of damaged rows of data to be tolerated before an error occurs This entry applies only if EndOfLine is true and K is nonnegative Tolerating a damaged row means locating its end in the encoded data by searching for an EndOfLine pattern and then substituting decoded data from the previous row if the previous row was not damaged, or a white scan line if the previous row was also damaged Default value: 0
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EncodedByteAlign
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boolean
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DamagedRowsBeforeError
integer
The compression achieved using CCITT encoding depends on the data, as well as on the value of various optional parameters For Group 3 one-dimensional encoding, in the best case (all zeros), each scan line compresses to 4 bytes, and the
S E CTIO N 3 3
Filters
compression factor depends on the length of a scan line If the scan line is 300 bytes long, a compression ratio of approximately 75:1 is achieved The worst case, an image of alternating ones and zeros, produces an expansion of 2:9
336 JBIG2Decode Filter
The JBIG2Decode lter (PDF 14) decodes monochrome (1 bit per pixel) image data that has been encoded using JBIG2 encoding JBIG stands for the Joint BiLevel Image Experts Group, a group within the International Organization for Standardization (ISO) that developed the format; JBIG2 is the second version of a standard originally released as JBIG1 and was approaching standards approval at the time of publication of this book JBIG2 encoding, which provides for both lossy and lossless compression, is useful only for monochrome images, not for color images, grayscale images, or general data The algorithms used by the encoder, and the details of the format, are not described here; a working draft of the JBIG2 speci cation can be found through the Web site for the JBIG and JPEG (Joint Photographic Experts Group) committees at <http://wwwjpegorg> In general, JBIG2 provides considerably better compression than the existing CCITT standard (discussed in Section 335) The compression it achieves depends strongly on the nature of the image Images of pages containing text in any language will compress particularly well, with typical compression ratios of 20:1 to 50:1 for a page full of text The JBIG2 encoder builds a table of unique symbol bitmaps found in the image, and other symbols found later in the image are matched against the table Matching symbols are replaced by an index into the table, and symbols that fail to match are added to the table The table itself is compressed using other means This results in high compression ratios for documents in which the same symbol is repeated often, as is typical for images created by scanning text pages This method also results in high compression of white space in the image, which does not need to be encoded because it contains no symbols While best compression is achieved for images of text, the JBIG2 standard also includes algorithms for compressing regions of an image that contain dithered halftone images (for example, photographs)