Baseline and Extended JPEG Encoder Core

Overview

This JPEG compression IP core supports the Baseline Sequential DCT and Extended Sequential DCT modes of the ISO/IEC 10918-1 standard. It implements an area-efficient, high-performance, ASIC or FPGA hardware JPEG encoder with very low pro-cessing latency.
The JPEG-EX-S Encoder produces compressed JPEG images and the video payload for Motion JPEG container formats. It accepts images with 8- or 12-bit color samples and up to four color components, in all widely-used color subsampling formats.
The encoder processes one color sample per clock cycle, enabling it to compress multiple Full-HD channels even in low-cost FPGAs. One of the smallest JPEG encoders available, it requires just 80,000 equivalent gates when mapped on an ASIC technology.
Once programmed, the easy-to-use encoder requires no assistance from a host pro-cessor to compress an arbitrary number of frames. SoC integration is straightforward thanks to standardized AMBA® interfaces: AXI Streaming for pixel and compressed data, and a 32-bit APB slave interface for registers access. Users can optionally insert timestamps or other metadata in the compressed stream using a dedicated AXI Streaming interface.
Customers with a short time to market priority can use CAST’s IP Integration Services to receive complete JPEG subsystems. These integrate the JPEG encoder with video interface controllers, Hardware UDPIP or Transport Stream networking stacks, or other IP cores available from CAST.
The core is designed with industry best practices, and its reliability and low risk have been proven through both rigorous verification and customer production. Its delivera-bles include a complete verification environment and a bit-accurate software model.

Key Features

Performs Baseline and Extended Sequential DCT JPEG encoding of images or video for ASICs or FPGAs, with small silicon area, high performance, and low latency.
Standards Support
ISO/IEC 10918-1 Standard Baseline and Extended Encoder (Sequential DCT modes)
Single-frame JPEG images and Motion JPEG payloads
8-bit and 12-bit per color samples
Up to four color components; any image size up to 64k x 64k
All scan configurations and all JPEG formats
APP, COM, and restart markers
Programmable Huffman Tables and Quantization tables
Rate Control Options
Image: Limits the size of each individual frame
Video: Regulates bit rate over a number of input frames
Interfaces
AXI Streaming I/O data interfaces
APB Control/Status interface
Performance and Size
? One encoded sample per clock cycle
? Small silicon footprint (about 80k ASIC gates)
Ease of Integration
Automatic program-once/encode-many operation
Simple, dedicated timestamps interface
Included bit-accurate software model generates test vectors, expected results, and core programming values
Optional Raster-to-Block Conversion with AXI or standard memory interface to the lines buffer

Block Diagram

Applications

The JPEG-EX-S core’s low processing latency and ability to regulate compressed image size or video bit rate make it ideal for video streaming systems even in the presence of strict bandwidth and latency limitations. Suitable applications include:
Consumer electronics or professional imaging products such as digital cameras, camcorders, and office automation equipment (printers, scanners, etc.).
Residential, corporate, airborne, and other security or surveillance systems.
Machine vision and video links for industrial, defense, or other systems.
Medical imaging systems, and advanced driver assistance systems.

Deliverables

Verilog RTL source code
Sophisticated self-checking Testbench
Software (C++) Bit-Accurate Model
Sample simulation and synthesis scripts
Comprehensive user documentation

Technical Specifications

Maturity

Production Proven

Availability

Now

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