Vendor: CAST Category: Image Conversion

PNG Lossless Compression Decoder

The PNG-D core implements a lossless image decompression engine compliant with the Portable Network Graphics (PNG) file format sp…

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Overview

The PNG-D core implements a lossless image decompression engine compliant with the Portable Network Graphics (PNG) file format specified in the ISO/IEC 15948 and RFC 2083 standards.

The decoder core can decompress greyscale, truecolor, and palette-based PNG images with 8 and 16 bits per color. The core supports alpha channel transparency  and all the filters and DEFLATE compression options specified by the PNG standard. The core does not currently support interlaced mode and images with under 8 bits per color, but these can be added on request.

The easy-to-use PNG-D core operates on a standalone basis, parsing the image header and decompressing image data without a host processor's assistance. PNG-D accepts compressed data and outputs pixel data via AXI4-Stream interfaces. A separate dedicated interface provides the system with the image header and any ancillary chunks to prepare the decoded images for further processing and/or display. Moreover, the core detects, reports, and automatically recovers from various errors in the input files.

The core is designed with industry best practices, and its reliability has been proven through rigorous verification. The deliverables include a complete verification environment and a bit-accurate software model.

Key features

  • PNG Image Format Support
    • Compliant with the ISO/IEC 15948 and RFC 2083 standards 
    • All chunk types
      • Ancillary chunks are extracted and broadcasted to the system
    • All color types
      • Greyscale with or without alpha
      • Truecolor with or without alpha
      • Indexed (Palette-Based) 
    • 8-bit & 16-bit per color channel 
      • Support for under 8 bits per color channel available on request
    • All five filters: Paeth, Average, Up, Sub and None
    • Both Dynamic and Static Huffman Tables
    • Interlacing and less than 8-bit per color can be added on request
  • Easy to Use and Integrate 
    • Requires no programming or control from the host
    • AXI4-Stream Interfaces for image and compressed data 
    • Dedicated AXI4-Stream interface for passing image format information and ancillary chunks to the system
    • Detects, reports, and automatically recovers from the following error types: CRC or Adler mismatch, image or zlib header syntax error, and unsupported image format 
    • Optional wrappers bridge the AXI4-Stream to AXI4 memory-mapped interfaces
  • High-Throughput
    • Over 100 Mpixels/s in mid-range FPGAs, and several hundreds of Mpixels/s on modern ASIC technologies
    • Nominal throughput:
      • 1 pixel/cycle for 8-bit greyscale
      • 0.33 pixels/cycle for 24-bit RGB
      • 0.25 pixels/cycle for 32-bit RGBA
      • Half the number of pixels per cycle for 16 bits per channel 
    • Worst case throughput is 89% of nominal.
  • Deliverables
    • Verilog RTL source code or targeted FPGA netlist
    • Verilog can be made available on request 
    • Integration Test-Bench 
    • Simulation & synthesis scripts
  •  

Block Diagram

PNG-D block diagram

Files

Product Sheet Download

Note: some files may require an NDA depending on provider policy.

Specifications

Identity

Part Number
PNG-D
Vendor
CAST

Provider

CAST
HQ: USA
CAST is a silicon intellectual property (IP) developer, aggregator, and integrator providing IP cores and subsystems since 1993. Our product line features both leading-edge and standards-based digital IP, including compression engines and image processing functions; 8051 microcontrollers and low-power 32-bit BA2X™ processors; industry-leading automotive interfaces; a complete family of SoC security modules; and a variety of peripherals, interfaces, and other IP cores. Our goal is to maximize IP benefits for our customers by delivering high quality, easy to use, cost effective solutions for real system development challenges. We minimize customer risk through rigorous development standards, complete deliverables with comprehensive documentation, and superlative customer support. We maximize customer value thorough competitive pricing and simple licensing—including royalty-free options—and long-term partnerships with all leading silicon providers and select technology leaders. Our product standards and business practices have been uniquely honed through successful projects with hundreds of systems designers since the very beginnings of the IP industry, making CAST one of the best IP partners available.
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Frequently asked questions about image conversion IP cores

What is PNG Lossless Compression Decoder?

PNG Lossless Compression Decoder is a Image Conversion IP core from CAST listed on Semi IP Hub.

How should engineers evaluate this Image Conversion?

Engineers should review the overview, key features, supported foundries and nodes, maturity, deliverables, and provider information before shortlisting this Image Conversion IP.

Can this semiconductor IP be compared with similar products?

Yes. Buyers can compare this product with similar semiconductor IP cores or IP families based on category, provider, process options, and structured technical specifications.

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