This bit stream is made up of the parts listed below (in the order listed) 1 The JBIG2 le header in Java

Generator Code 39 Extended in Java This bit stream is made up of the parts listed below (in the order listed) 1 The JBIG2 le header
This bit stream is made up of the parts listed below (in the order listed) 1 The JBIG2 le header
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97 4A 42 32 0D 0A 1A 0A 01 00 00 00 01
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Since the JBIG2 le header is not used in PDF, this header is not placed in the JBIG2 stream object, and is discarded 2 The rst JBIG2 segment (segment 0) in this case, the symbol dictionary segment
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00 00 00 00 00 01 00 00 00 00 32 00 00 03 FF FD FF 02 FE FE FE 00 00 00 01 00 00 00 01 2A E2 25 AE A9 A5 A5 38 B4 D9 99 9C 5C 8E 56 EF 0F 87 27 F2 B5 3D 4E 37 EF 79 5C C5 50 6D FF AC
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This is a global segment (segment page association = 0) and so is placed in the JBIG2Globals stream 3 The page information segment
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00 00 00 01 30 00 01 00 00 00 13 00 00 00 34 00 00 00 42 00 00 00 00 00 00 00 00 40 00 00
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and the immediate text region segment
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00 00 00 02 06 20 00 01 00 00 00 1E 00 00 00 34 00 00 00 42 00 00 00 00 00 00 00 00 02 00 10 00 00 00 02 31 DB 51 CE 51 FF AC
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These two segments constitute the contents of the JBIG2 page, and are placed in the PDF XObject representing this image 4 The end-of-page segment
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00 00 00 03 31 00 01 00 00 00 00
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and the end-of- le segment
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00 00 00 04 33 01 00 00 00 00
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Since these are not used in PDF, they are discarded
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S E CTIO N 3 3
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The resulting PDF image object, then, contains the page information segment and the immediate text region segment, and refers to a JBIG2Globals stream that contains the symbol dictionary segment
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337 DCTDecode Filter
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The DCTDecode lter decodes grayscale or color image data that has been encoded in the JPEG baseline format (JPEG stands for the Joint Photographic Experts Group, a group within the International Organization for Standardization that developed the format; DCT stands for discrete cosine transform, the primary technique used in the encoding) JPEG encoding is a lossy compression method, designed speci cally for compression of sampled continuous-tone images and not for general data compression Data to be encoded using JPEG consists of a stream of image samples, each consisting of one, two, three, or four color components The color component values for a particular sample must appear consecutively Each component value occupies an 8-bit byte During encoding, several parameters control the algorithm and the information loss The values of these parameters, which include the dimensions of the image and the number of components per sample, are entirely under the control of the encoder and are stored in the encoded data DCTDecode generally obtains the parameter values it requires directly from the encoded data However, in one instance, the parameter might not be present in the encoded data but must be speci ed in the lter parameter dictionary; see Table 311 The details of the encoding algorithm are not presented here but can be found in the ISO speci cation and in JPEG: Still Image Data Compression Standard, by Pennebaker and Mitchell (see the Bibliography) Brie y, the JPEG algorithm breaks an image up into blocks 8 samples wide by 8 high Each color component in an image is treated separately A two-dimensional DCT is performed on each block This operation produces 64 coef cients, which are then quantized Each coef cient may be quantized with a different step size It is this quantization that results in the loss of information in the JPEG algorithm The quantized coef cients are then compressed
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CHA P TE R 3
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TABLE 311 Optional parameter for the DCTDecode lter
KEY TYPE VALUE
ColorTransform
integer
A code specifying the transformation to be performed on the sample values: 0 1 No transformation If the image has three color components, transform RGB values to YUV before encoding and from YUV to RGB after decoding If the image has four components, transform CMYK values to YUVK before encoding and from YUVK to CMYK after decoding This option is ignored if the image has one or two color components
Note: The RGB and YUV used here have nothing to do with the color spaces de ned as part of the Adobe imaging model The purpose of converting from RGB to YUV is to separate luminance and chrominance information (see below) The default value of ColorTransform is 1 if the image has three components and 0 otherwise In other words, conversion between RGB and YUV is performed for all three-component images unless explicitly disabled by setting ColorTransform to 0 Additionally, the encoding algorithm inserts an Adobede ned marker code in the encoded data indicating the ColorTransform value used If present, this marker code overrides the ColorTransform value given to DCTDecode Thus it is necessary to specify ColorTransform only when decoding data that does not contain the Adobe-de ned marker code
The encoding algorithm can reduce the information loss by making the step size in the quantization smaller at the expense of reducing the amount of compression achieved by the algorithm The compression achieved by the JPEG algorithm depends on the image being compressed and the amount of loss that is acceptable In general, a compression of 15:1 can be achieved without perceptible loss of information, and 30:1 compression causes little impairment of the image Better compression is often possible for color spaces that treat luminance and chrominance separately than for those that do not The RGB-to-YUV conversion provided by the lters is one attempt to separate luminance and chrominance; it conforms to CCIR recommendation 601-1 Other color spaces, such as the CIE 1976 L*a*b* space, may also achieve this objective The chrominance components can then be compressed more than the luminance by using coarser sampling or quantization, with no degradation in quality