RGGBer Embedded Vision Development Kit

An open source, modular, FPGA-based development kit that makes embedded vision design easy and affordable.

Oct 06, 2017

Project update 3 of 16

Use Case: Machine Vision with HD Camera

The RGGBer campaign is off to a great start. We’ve made 90% of our goal already. Keep spreading the word! In this update, we’re going to look more closely at a common use case for RGGBer: HD camera machine vision.

A full HD camera is a fundamental part of most machine vision applications. The RGGBer Dev Kit hardware provides excellent support for HD camera functionality, while also providing reference design code to help RGGBer users get a full-featured HD camera up and running quickly and easily. Specifically, the RGGBer “HD Camera Dev Kit” bundles together all the hardware needed for most HD camera, machine vision development tasks.

The reference design offers fast auto-focus (AF), real-time automatic gain control (AGC), automatic exposure control (AEC), automatic white balance (AWB), HDMI output, wireless control, etc. It is an all but complete camera ready for image capture and transmission. In addition, users can implement user-defined image signal processing (ISP) and analysis algorithms using the on-board FPGA.

As explained in the OV5640 camera module’s Firmware User Guide, the embedded auto-focus functions are controlled by the built-in MCU of the OV5640, and have very fast auto-focus speed compared to external implementations. In the video demo below, you can see the AF speed is less than three seconds. RGGBer Dev Kit provides auto-focus firmware code that can be downloaded by RGGBer’s on-board MCU to the OV5640.

Users can trigger and release auto-focus with RGGBer’s wireless control App. The real-time AGC, AEC, and AWB are implemented by OV5640’s built-in ISP engine. Users can also implement selected ISP algorithms via the FPGA.

RGGBer provides the OV5640 initial setting code to make sure that the OV5640 ouputs 1080p video with the correct pixel format.

OV5640 receives setting date and AF firmware via Omnivison’s Serial Camera Control Bus(SCCB). It is quite similar to a general I2C bus. RGGBer provides an SCCB driver to user for all OV5640 setting tasks.

In rev.4 of the RGGBer Dev Kit, the FPGA will be able to directly configure the OV5640, leaving the on-board MCU available for other options. We will update the reference design to support the latest hardware before shipping.

Jie Zou
RGGBer team

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