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Blog Introducing the Raspberry Pi Global Shutter Camera. Perfect for Fast Motion and Machine Vision
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  • Author Author: e14phil
  • Date Created: 9 Mar 2023 2:51 PM Date Created
  • Views 245 views
  • Likes 9 likes
  • Comments 10 comments
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Introducing the Raspberry Pi Global Shutter Camera. Perfect for Fast Motion and Machine Vision

e14phil
e14phil
9 Mar 2023

This morning the Raspberry Pi Foundation launched a specialized 1.6-megapixel camera that can capture rapid motion without introducing artefacts typical of rolling shutter cameras.

Ideal for fast motion photography and machine vision applications.

image

Built around Sony’s 1.6-megapixel IMX296 sensor, the Global Shutter Camera is able to capture rapid motion without introducing rolling shutter artefacts.

This makes it a great fit for sports photography, and for machine vision applications, where even small amounts of distortion can seriously degrade inference performance.

Specification

Form factor: 38 × 38 × 19.8mm (29.5mm adapter and dust cap)

Weight: 34g (41g with adapter and dust cap)

Sensor: Sony IMX296LQR-C

Resolution: 1.58 megapixels (colour)

Sensor size: 6.3mm sensor diagonal

Pixel size: 3.45μm × 3.45μm

Output: RAW10

Back focus length of lens: Adjustable (12.5–22.4mm)

Lens standards: CS-Mount C-Mount (C-CS adapter included)

IR cut filter: Integrated

Ribbon cable length: 150mm

Included accessories:
mount adapter
Screwdriver

Tripod mount:1/4”-20

Compliance:

FCC 47 CFR Part 15, Subpart B, Class B Digital Device Electromagnetic Compatibility Directive (EMC) 2014/30/EU Restriction of Hazardous Substances (RoHS) Directive 2011/65/EU

Production lifetime: The Raspberry Pi Global Shutter Camera will remain in production until at least January 2032

...

Rolling shutters, global shutters

From Eben's Official Blog:

"Every camera we’ve released to date, from 2014’s Camera Module 1 to our High Quality Camera and beyond, has used a rolling shutter sensor. These sensors have a two-dimensional array of light-sensitive pixels, which generate an analogue value proportional to the amount of light falling on the pixel during the exposure time; and a row of analogue-to-digital converters (ADCs), which convert these analogue values into digital values which are fed back to your Raspberry Pi.

The row of ADCs is connected to each row of the pixel array in turn, so each row is sampled at a slightly different time. Provided there is no motion in the scene this isn’t a problem, but once things start to move — and particularly if something is moving fast — we start to see rolling shutter artefacts. Linear motion results in compression, stretching, or shearing of the moving object. Rotary motion can create some very odd-looking shapes indeed."

image

Severe rolling shutter artefacts are unsightly, and hard to detect and correct, but even imperceptible artefacts can interfere with the operation of machine vision algorithms. If we want to eliminate them altogether, we need to use a global shutter sensor. This pairs each pixel with an analogue storage element; when the shutter fires, each pixel immediately copies its analogue value into its storage element, from where it can be read and converted at leisure.

The storage element adds complexity and area to each pixel. Global shutter sensors tend to have a lower resolution than rolling shutter sensors of the same size: contrast the 7.9mm, 12-megapixel IMX477 sensor used in the High Quality Camera with the 6.3mm, 1.6-megapixel IMX296.

Enter the Raspberry Pi Global Shutter Camera

Despite the challenges associated with rolling shutter artefacts, our existing cameras are widely used in hobbyist and industrial machine vision applications. And we’ve seen some real ingenuity: to compensate for artefacts when imaging products on a high-speed conveyor belt, one of our industrial customers ended up training their models using pre-sheared input data.

image
If you think my front is cool…
image
… surprise logo for the rear view fans

For these applications, a global shutter sensor offers clear advantages. And reduced resolution isn’t a problem, as high-resolution images are generally down-sampled before being fed into machine vision models.

The Raspberry Pi Global Shutter Camera combines the C/CS-mount metalwork of our High Quality Camera with Sony’s IMX296 sensor. It is compatible with the same broad variety of lenses, including the 6mm CS‑mount and 16mm C-mount CGL lenses that we offer through our Approved Reseller partners.

The video below illustrates the benefits of a global shutter in the presence of rapid rotary motion. First we see the output from the High Quality Camera, showing distinctive rolling shutter artefacts, and then we see the artefact-free output from the Global Shutter Camera

Like all our camera products, you can use the Global Shutter Camera with any Raspberry Pi computer that has a CSI camera connector, and we’ve updated our hardware documentation to include everything you need to know about the new product. You’ll need to update Raspberry Pi OS to use the new camera: sudo apt update; sudo apt full-upgrade; sudo reboot and you’re good to go.

Mechanical Specifications

image

What project could you see using this with? 

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Top Comments

  • charlieo21
    charlieo21 19 days ago +2
    Here is a good video comparing global shutter & rolling shutter www.youtube.com/watch
  • beacon_dave
    beacon_dave 18 days ago in reply to colporteur

    Don't think you need side by side for this one... 

    https://en.wikipedia.org/wiki/Rolling_shutter#/media/File:Propellor_with_rolling-shutter_artifact.jpg

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  • e14phil
    e14phil 18 days ago in reply to charlieo21

    Thats super helpful charlieo21 

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  • shabaz
    shabaz 19 days ago in reply to colporteur

    There's a video clip on the raspberry pi website, where they show a guitar being played. I took a screenshot and pasted below:

    image

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  • shabaz
    shabaz 19 days ago in reply to shabaz

    EDIT: I take it back. Apparently that rear panel is not chassis/structural metal for mounting purposes. It is a plastic cover for covering the electronics according to this (source: https://www.tomshardware.com/reviews/raspberry-pi-global-shutter-camera-review-high-speed-captures )

    image

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  • colporteur
    colporteur 19 days ago

    Severe rolling shutter artefacts are unsightly, and hard to detect and correct, but even imperceptible artefacts can interfere with the operation of machine vision algorithms.

    Anyone have a picture side by side that demonstrates what the artefacts might appear like?

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