Real-Time Wavelet Compression for High Speed Video #Video
Shane Colton explores using wavelet compression for video compression.
The next stop on the Freight Train of Pixels is the wavelet compression engine. Previously, I built up the CMV12000 input module, which turned out to be easier than I thought. The output of that module is a set of 64 10-bit pixels and one 10-bit control signal that update on a 60MHz pixel clock (px_clk). This is too much data to write directly to an NVMe SSD, so I want to compress it by about 5:1 in real-time on the XCZU4 Zynq Ultrascale+ SoC.
Wavelet compression seems like the right tool for the job, prioritizing speed and quality over compression ratio. It needs to run on the SoC’s programmable logic (PL), where there’s enough parallel computation and memory bandwidth for the task. This post will build up the theory and implementation of this wavelet compression engine, starting from the basics of the discrete wavelet transform and ending with encoded data streams being written to RAM. It’s a bit of a long one, so I broke it into several sections:
Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: adafruit.com/editorialstandards
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
