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Decoding Sequential-Mode JPEG Images marker is read ReadMarker determines the marker type and then calls functions that decode specific markers ReadQuantization The ReadQuantization function processes a DQT marker The JpegDecoderQuantizationTable objects read the actual quantization tables from the input stream A DQT marker may define multiple quantization tables, so this function determines how many tables the marker contains and the identity of each one ReadHuffmanTable This function is very similar to ReadQuantization except that it reads DHT markers The actual Huffman table data is read by the JpegHuffmanDecoder objects This function reads Huffman tables until no more remain in the marker data ReadStartOfFrame The ReadStartOfFrame function reads SOFn markers All SOFn markers have the same format, so the same function is used to read all types The decoder relies upon the ReadMarker function to determine if the SOFn marker is one supported by the decoder ReadStartOfScan The ReadStartOfScan reads an SOS marker from the input stream It determines the components that make up the scan and then stores a list of pointers to the corresponding JpegDecoderComponent objects within the scan_components array ReadSequentialInterleavedScan and ReadSequentialNonInterleavedScan The ReadSequentialInterleavedScan and ReadSequentialNonlnterleavedScan functions control the reading of data units from the input stream The former is used when the current scan contains more than one component; the latter is used when there is only one component in the scan The individual component objects read the DCT coefficients into the data units However, this function determines the ordering of the components and which data unit is read for each component They also keep track of the number of data units read and compare this to the restart interval in order to determine when a restart marker must be read
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The JpegDecoder class is used in the same manner as the other decoder classes presented in this book The following fragment illustrates how to use it to convert a JPEG file to a Windows BMP file #include "jpgdecodh" #include "bmpencodh" ifstream input ("INPUTJPG", ios::binary) ofstream output ("OUTPUTBMP", ios::binary) ; BitmapImage image ; JpegDecoder decoder ; decoderReadImage (input, image) ; BmpEncoder encoder ; encoderWriteImage (output, image) ;
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Decoding Application The DECODER application converts a JPEG image to BMP format The commandline format for this application is DECODER inputjpg outputbmp DECODER creates a JpegDecoder object and then calls its ReadImage function to read the input file into a BitmapImage object It creates the BMP file by calling the WriteImage function of a BmpEncoder object
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In this chapter we cover the implementation of sequential-mode JPEG encoders In general, the process for creating a JPEG file is the reverse of the decoding process A major difference between encoding and decoding is that encoding requires several choices to be made while in decoding you take what you get The endcoding choices include compression parameters, Huffman code generation, and block ordering
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Compression Parameters In compressing an image using sequential-mode JPEG compression, we have several choices These include The composition and number of quantization tables and the assignment of tables to components The number of Huffman tables, their assignment to components, and the method for their creation The number of scans and the components in each The frequency of restart markers Component sampling frequencies Whether to create a color or grayscale image Whether to use baseline or extended frames An encoder can make these choices either on a per-image basis or globally
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Creating Sequential JPEG Images Two frame types can be used for sequential JPEG with Huffman encoding: baseline sequential (SOF0) or extended sequential (SOF1) The only difference between the two is that baseline sequential supports only 8-bit samples and a maximum of two DC and two AC Huffman tables; extended sequential supports 8-bit and 12-bit samples and up to four DC and four AC Huffman tables Baseline sequential is the JPEG mode implemented by most JPEG decoders; thus, for the greatest compatibility, an encoder should use it when possible The encoder at the end of this chapter encodes only 8-bit sample data and, since there is no need to for more than two of each type of Huffman table, it uses baseline sequential
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Extended sequential is upwardly compatible with baseline sequential JPEG If an encoder were to simply replace the SOF0 marker with an SOF1 marker, it would create a perfectly valid extended sequential file
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Huffman Tables Since color images have three components and baseline mode allows only two Huffman tables of each type, an encoder has to share its Huffman tables among components or split the components among multiple scans Our encoder always uses the Huffman tables with the identifier 0 to encode the Y component and the table with the identifier 1 to encode the Cb and Cr components If the Cb and Cr components are encoded within the same scan, they share a Huffman table
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If an image is divided into two or more scans it is possible for the encoder to assign a different Huffman table for each scan Our encoder only assigns the Cb and Cr components different Huffman tables when they are encoded in different scans If they are encoded within the same scan, even if the Y component is not part of the scan, they share Huffman tables
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Quantization Tables Both baseline and extended sequential modes allow up to four quantization tables defined for an image Our sample encoder is only going to use two One table (ID=0) is used for the Y component and the other (ID=1) is used for the Cb and Cr components These table assignments are an arbitrary choice The next problem is how to create the quantization tables We could allow a user to specify all the elements of the quantization table, but this would make using the decoder a little tedious, especially for people who do not know the inner workings of JPEG Having a fixed set of quantization values would not be a good
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