The significance of AC and DC is explained in 7 in Visual Studio .NET

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The significance of AC and DC is explained in 7
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Table 53 DHT Format
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Field Size 1 byte
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Description The 4 high-order bits specify the table class A value of 0 means a DC table, a value of 1 means an AC table The 4 low-order bits specify the table identifier This value is 0 or 1 for baseline frames and 0, 1, 2, or 3 for progressive and extended frames The count of Huffman codes of length 1 to 16 Each count is stored in 1 byte The 1-byte symbols sorted by Huffman code The number of symbols is the sum of the 16 code counts
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16 bytes Variable
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The DRI (Define Restart Interval) marker specifies the number of MCUs between restart markers within the compressed data The value of the 2-byte length field following the marker is always 4 There is only one data field in the marker a 2-byte value that defines the restart interval An interval of zero means that restart markers are not used A DRI marker with a nonzero restart interval can be used re-enable restart markers later in the image A DRI marker may appear anywhere in the file to define or redefine the restart interval, which remains in effect until the end of the image or until another DRI marker changes it A DRI marker must appear somewhere in the file for a compressed data segment to include restart markers Restart markers assist in error recovery If the decoder finds corrupt scan data, it can use the restart marker ID and the restart interval to determine where in the image to resume decoding The following formula can be used to determine the number of MCUs to skip: MCUs to Skip = Restart Interval ((8 + Current Marker ID - Last Marker ID)MOD8)
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Example Assume that the restart interval is 10 After 80 MCUs have been decoded, the RST7 marker is read from the input stream If the decoder encounters corrupt data before reading the next restart marker (RST0), it stops decoding and scans the input stream for the next restart marker If the next marker is RST3, the decoder skips 40 MCUs (= 10 ((8 + 3 - 7)MOD8)) from the last known point (80) The decoder resumes decoding at the 121st MCU in the image
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The DQT (Define Quantization Table) marker defines (or redefines) the quantization tables used in an image A DQT marker can define multiple quantization tables (up to 4) The quantization table definition follows the markers length
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JPEG File Format field The value of the length field is the sum of the sizes of the tables plus 2 (for the length field) The format of a quantization table definition is shown in Table 54 Each table starts with 1 byte that contains information about the table If the 4 highorder bits of the information byte are zero, the quantization table values are 1 byte each and the entire table definition is 65 bytes long If the value is 1, the size of each quantization value is 2 bytes and the table definition is 129 bytes long Twobyte quantization values may be used only with 12-bit sample data The 4 low-order bits assign a numeric identifier to the table, which can be 0, 1, 2, or 3 The information byte is followed by 64 quantization values that are stored in JPEG zigzag order (defined in 7) DQT markers can appear anywhere in an image file The one restriction is that if a scan requires a quantization table it must have been defined in a previous DQT marker
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Table 54 Quantization Table Definition in a DQT Marker
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Field Size 1 byte
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Description The 4 low-order bits are the table identifier (0, 1, 2, or 3) The 4 high-order bits specify the quanization value size (0 = 1 byte, 1 = 2 bytes) 64 1- or 2-byte unsigned quantization values
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