Matrox Electronic Systems II manual Jpeg Fpga

72 Chapter 5: Matrox Meteor-II hardware reference

	Pixel Data	Strip Buffer	16	SRAM
	Input/Output	Memory		(64Kbytes)
		Color Space
		Converter
Meteor-II	24
Grab Port
	Block	Host
Interface
	Data	Interface
	8		8		24
	Pixel	Host	8		Progressive
				Host
	Interface	Interface			Path
				Interface
					MJPEG
		JPEG			FPGA
		Processor
				JPEG
		Code	8	Processor	Memory
		Interface		Interface	Port
	MJPEG Module				64
					VIA SGRAM
					Interface Port

The Matrox Meteor-II MJPEG module supports lossy compression of RGB 8:8:8 and YUV 4:2:2 standard video, in continuous mode. The module also supports lossy and lossless compression of 8-bit monochrome images.

❖10- and 12-bit lossless compression is supported on the PCI/CompactPCI version only.

Color Space Converter The Color Space Converter has two functions. During compression, it converts the incoming data for the JPEG processor; the data is reformatted from raster format into 8 x 8 pixel blocks and then passed back to the JPEG processor. The Color Space Converter’s second function is to convert RGB data into YUV format in order to reduce the processing time and the amount of data for compression.

During decompression, the 8 x 8 pixel blocks are reformatted into raster format, and in the case of RGB data, the Color Space Converter reconverts the compressed YUV data into RGB data.