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Output File Structure The JPEG standard is fairly flexible when it comes to the ordering of markers within an output stream Three major marker ordering restrictions must be followed: The file must start with an SOI marker, follow with a JFIF APP0 marker, and end with an EOI marker For the JPEG modes we are using there can be only one SOF marker and it must occur before any SOS markers All Huffman and quantization tables used by a scan must be defined by DHT and DQT markers that come before the SOS marker Figure 93 shows a block ordering for a JPEG file that will work in most situations The sample JPEG encoder follows this scheme Encoders that need to store application-specific information need to insert APPn blocks containing this data into the output file Figure 93 Encoder Block Ordering
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Doing the Encoding Validations The first step in creating a JPEG file is to validate the compression parameters The encoder should ensure that The sampling frequencies do not result in scans with MCUs containing more than 10 data units The sampling frequencies do not result in fractional sampling All of the components in the image will be written in some scan Outputting the Blocks With the exception of the compressed data that follows the SOS marker and the generation of Huffman tables for the DHT markers, creating the markers is a simple matter of filling in the values for the fields shown in 5 The only difficult part is creating the compressed data, which will be dealt with in the next few sections
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Down-Sampling The first step in the compression process is down-sampling That is, if a component has either a horizontal or a vertical sampling frequency of less than the maximum value of all the components, it is shrunk Suppose we have a color image whose components have the following sampling frequencies: Horizontal Vertical
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This means that for every two samples taken for the Y component in each direction, one sample is taken for the Cb and Cr components Another way to look at this is to convert the sampling frequencies to intervals where each interval is the maximum frequency value divided by a component's frequency value For the previous example the horizontal and vertical intervals are Horizontal Vertical
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Conceptually, the down-sampling process for a component would be For II = 0 To IMAGEHEIGHT - 1 Step VERTICALINTERVAL Begin For JJ = 0 To IMAGEWIDTH - 1 Step HORIZONTALINTERVAL Begin COMPONENTDOWNSAMPLE [II/VERTICALINTERVAL] [JJ/HORIZONTALINTERVAL] = COMPONENTPIXELDATA [II][JJ] End End This process divides the component's pixel data into blocks whose dimensions are the sampling intervals, and takes one sample from each block While this method works, a better one is to take the average sample value for each block rather than the value from one pixel The preceding example shows all of the component's data being down-sampled into a buffer, which in reality need not be anything other than 8 8 If the down-sampling process is organized to produce one data unit at a time, the DCT and quantization processes shown in 7 can be performed immediately, eliminating the need to buffer a component's down-sampled data At this point in the encoding process, an encoder can take one of two paths It can be structured so that as soon as it has performed the DCT and quantization it immediately encodes the data unit Or it can store in a buffer all of the DCT coefficients for the components within a scan, then handle the interleaving and data unit encoding in a separate pass
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