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ZR36050PQC-27 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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ZR36050PQC-27 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 52 page  ZR36050 August 1993 ZORAN Corporation s 1705 Wyatt Drive s Santa Clara, CA 95054 s (408) 986-1314 s FAX (408) 986-1240 JPEG IMAGE COMPRESSION PROCESSOR ADVANCE INFORMATION s Implements JPEG Baseline image compression and expansion, including: - DCT/IDCT operations - Quantization - Variable length coding/decoding s Full support of the JPEG Baseline standard, including: - Bit and byte stuffing - JPEG markers including restart (RST), application (APP), and comment (COM) s JPEG Lossless compression and expansion s DMA/SLAVE bus interface s Motion video (30 frames/sec) compression/expansion capability for CCIR resolution (720 x 480) FEATURES s “Fast Preview” option - Preview of “thumbnail” version of images (up to 25x faster) s Bit rate control option - Guarantees compressed image file size s Low cost solution - Low cost single chip - Support for inexpensive memories - Requires minimal host intervention s TTL compatible s 27 and 21 MSamples/sec data-rate s Standby mode for very low power consumption s 100-pin plastic quad flat-pack (PQFP) packaging s Computer and multimedia add-in boards s Full-motion video compression/expansion s Digital still cameras and peripherals s Security and industrial systems APPLICATIONS GENERAL DESCRIPTION The ZR36050 is a high-speed JPEG Image Compression Pro- cessor that performs the algorithm specified by the JPEG Baseline and JPEG Lossless standards for high-quality image compression and expansion of continuous-tone color or mono- chrome images. The ZR36050 performs Discrete Cosine Transform (DCT), quantization and variable-length encoding for image compression (coding), and the corresponding inverse operations for expansion (decoding). In the JPEG Baseline encoding operation, the ZR36050 performs the DCT operation on 8 x 8 blocks of image data, con- verting image data into its spatial frequency components, and quantizes them using a user defined “quantization table.” Because the human visual system is less sensitive at the higher spatial frequencies, these higher frequency components can be quantized more coarsely than the lower-frequency components, with negligible effect on image quality. The coarser quantization of high-frequency coefficients results in long strings of zero valued quantized coefficients, when the 8x8 blocks are scanned in zigzag order. The scanned coefficients are characterized in terms of their nonzero values and the zero run lengths. As a result, a long string of zeroes is coded as a single number. The ZR36050 then performs Huffman coding using user-defined Huffman tables, whereby bit patterns of dif- ferent lengths code the nonzero values (values that occur frequently use the shortest codes; while those that infrequently occur use the longest codes). These techniques greatly reduce the amount of memory needed to store an image. In the decoding operation, the compressed data is decoded (the inverse of the Huffman and the zigzag modified-run-length coding), and dequantized. A 2-D inverse Discrete Cosine Trans- form is performed on the DCT coefficients, resulting in an expanded image. Figure 1. ZR36050 Logical Pinout CWE WR CCS CS 12 PIXEL DSYNC COMP RESET STDBY FREEZE END STOP CL ZR36050 JPEG IMAGE COMPRESSION PROCESSOR Host Interface Compressed Data Interface PIXEL Interface Control 2 EOS CLK_IN COE CODE CAEN CBUSY DATA ADDR INT DINT DREQ VSS +5V CSYNC RD DACK CLKEN DCT Coefficient Output Clock COEF 11 8 8 10 s Videophones and color FAX machines s Color printers and scanners s Fixed bit rate image transmission devices s Cost-sensitive image compression systems This document was created with FrameMaker 4.0.4 |
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