OpenMV Promises “Flyby” Imaging Of Components For Pick And Place Project

November 10, 2023 by Donald Papp 8 Comments

[iforce2d] has an interesting video exploring whether the OpenMV H7 board is viable as a flyby camera for pick and place, able to quickly snap a shot of a moving part instead of requiring the part to be held still in front of the camera. The answer seems to be yes!

The OpenMV camera module does capture, blob detection, LCD output, and more.

The H7 is OpenMV‘s most recent device, and it supports a variety of useful add-ons such as a global shutter camera sensor, which [iforce2d] is using here. OpenMV has some absolutely fantastic hardware, and is able to snap the image, do blob detection (and other image processing), display on a small LCD, and send all the relevant data over the UART as well as accept commands on what to look for, all in one neat package.

It used to be that global shutter cameras were pretty specialized pieces of equipment, but they’re much more common now. There’s even a Raspberry Pi global shutter camera module, and it’s just so much nicer for machine vision applications.

Watch the test setup as [iforce2d] demonstrates and explains an early proof of concept. The metal fixture on the motor swings over the camera’s lens with a ring light for even illumination, and despite the moving object, the H7 gets an awfully nice image. Check it out in the video, embedded below.

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Digital Photography Comes To The Apple II

November 1, 2023 by Jenny List 8 Comments

Back in the very early days of consumer digital photography, one of the first stars of the new medium came from Apple. The QuickTake 100 used a novel flat form factor and at its highest resolution could only shoot 640×480 images, but at the time it was a genuine object of desire. It came in Windows and Apple versions, and to use the Apple variant required a Mac of the day with appropriate software.

The interface was an Apple serial connector though, so it was quite reasonable for [Colin Leroy-Mira] to wonder whether it could work with Apple’s 8-bit machines. The result is QuickTake for the Apple IIc, the product that perhaps Apple should have brought us in an alternative 1994.

Fortunately the protocol has already been reverse engineered and forms part of the dcraw package, however the process of extracting the code wasn’t easy. The full resolution and colour of the original pictures has to be sacrificed, and of course once the custom serial cable has been made it’s a painfully slow process transferring the pictures. But to get anything running in this way on such elderly hardware which was never intended to perform this task is an extremely impressive feat. We would have given anything for this, back in the 8-bit days.

If you have a QuickTake and want to use a more modern machine, we’ve got you covered there, too.

Using LEDs To Determine A Video Camera’s True Framerate

October 23, 2023 by Maya Posch 17 Comments

Interpolation and digital cropping are two techniques which are commonly used by marketing folk to embellish the true specifications of a device. Using digital cropping a fictitious zoom level can be listed among the bullet points, and with frame interpolation the number of frames per second (FPS) recorded by the sensor is artificially padded. This latter point is something which [Yuri D’Elia] came across with a recently purchased smartphone that lists a 960 FPS recording rate at 720p. A closer look reveals that this is not quite the case.

The smartphone in question is the Motorola Edge 30 Fusion, which is claimed to support 240 and 960 FPS framerates at 720p, yet the 50 MP OmniVision OV50A sensor in the rear camera is reported as only supporting up to 480 FPS at 720p. To conclusively prove that the Motorola phone wasn’t somehow unlocking an unreported feature in this sensor, [Yuri] set up an experiment using three LEDs, each of which was configured to blink at either 120, 240 or 480 Hz in a side-by-side configuration.

As [Yuri] explains in the blog post, each of these blinking frequencies would result in a specific pattern in the captured video, allowing one to determine whether the actual captured framerate was equal to, less than or higher than the LED’s frequency. Perhaps most disappointingly about the results is that this smartphone didn’t even manage to hit the 480 FPS supported by the OV50A sensor, and instead pegged out at a pedestrian 240 FPS. Chalk another one up for the marketing department.

Solar Camera Built From Raspberry Pi

October 17, 2023 by Richard Baguley 29 Comments

Ever since an impromptu build completed during a two-week COVID-19 quarantine back in 2020, [Will Whang] has been steadily improving his Raspberry Pi solar photography setup. It integrates a lot of cool stuff: multiple sensors, high bandwidth storage, and some serious hardware. This is no junk drawer build either, the current version uses a $2000 USD solar telescope (an LS60M with 200mm lens) and a commercial AZ-GTi mount.

He also moved up somewhat with the imaging devices from the Raspberry Pi camera module he started with to two imaging sensors of his own: the OneInchEye and the StarlightEye, both fully open source. These two sensors feed data into the Raspberry Pi 4 Compute Module, which dumps the raw images into storage.

Because solar imaging is all about capturing a larger number of images, and then processing and picking the sharpest ones, you need speed. Far more than writing to an SD Card. So, the solution [Will] came up with was to build a rather complex system that uses a CF Express to NVME adapter that can keep up, but can be quickly swapped out.

Unfortunately, all of this hard work proved to be in vain when the eclipse came, and it was cloudy in [Wills] area. But there is always another interesting solar event around the corner, and it isn’t going anywhere for a few million years. [Will] is already looking at how to upgrade the system again with the new possibilities the Raspberry Pi 5 offers.

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Use Your Old SLR As A Digital Camera?

October 9, 2023 by Jenny List 43 Comments

Back in the late 1990s as the digital revolution overtook photography there were abortive attempts to develop a digital upgrade for 35mm film cameras. Imagine a film cartridge with attached sensor, the idea went, which you could just drop into your trusty SLR and continue shooting digital. As it happened they never materialised and most film SLRs were consigned to the shelf. So here in 2023 it’s a surprise to find an outfit called I’m Back Film promising something very like a 35mm cartridge with an attached sensor.

The engineering challenges are non-trivial, not least that there’s no standard for distance between reel and exposure window, and there’s next-to-no space at the focal plane in a camera designed for film. They’ve solved it with a 20 megapixel Micro Four Thirds sensor which gives a somewhat cropped image, and what appears to be a ribbon cable that slips between the camera back and the body to a box which screws to the bottom of the camera. It’s not entirely clear how they solve the reel-to-window distance problem, but we’re guessing the sensor can slide from side to side somehow.

It’s an impressive project and those of us who shot film back in the day can’t resist a bit of nostalgia for our old rigs, but we hope it hasn’t arrived too late. Digital SLRs are ubiquitous enough that anyone who wants one can have one, and meanwhile the revival in film use has given many photographers a fresh excuse to use their old camera the way it was originally intended. We’ll soon see whether it catches on though — the crowdsourcing campaign for the project will be starting in a few days.

Oddly this isn’t the first such project we’ve seen, though it is the first with a usable-size sensor.

Large Format Photos Without The Large Price Tag

September 9, 2023 by Jenny List 37 Comments

There’s a good reason that the go-to format for most film photographers is 35 mm, in that it provides a mix of convenience and cost. Shooting huge large-format negatives in the style of a 19th-century photographer can return astounding pictures with detail and lens effects unavailable on relatively tiny cameras, but it’s hardly the most convenient or cheapest medium. [Amos Chapple] may have a way to cut those costs though, by using a digital camera to capture the image projected by the camera onto a screen where the film would otherwise be.

He’s following in the footsteps of a Ukrainian photographer who tried the same technique photographing the projected image from the lens side, but that approach gave disappointing results due to the offset angle. Instead he’s placing the camera behind a translucent screen, having his DSLR behind a sheet of waxed paper held at the focal plane.

The results are we’d have to say, stunning. The old Soviet Ukrainian camera he’s using is something of a beast, but his photos of dancers at a folk festival have that other-worldly look to them which might well have something form the 1890s about it. We like it a lot and perhaps it’s tempting to fashion a poor-mans version using a cardboard box, and try for ourselves. Long-time readers will know it’s not the only attempt to digitize a large format camera we’ve seen.

Motorized Camera Slider Rides On Carbon

September 1, 2023 by Bryan Cockfield 1 Comment

While not every camera mount needs to have six degrees of freedom, one or two can be extremely helpful in the photographic world. In order to make time-lapse shots with some motion or shots that incorporate some parallax, a moving camera mount or dolly is needed, and this small one builds upon a pre-existing, although non-motorized, camera slider.

The slider is an inexpensive model from everyone’s favorite online warehouse, with rails that are at least coated in carbon, if not made out of it entirely, to ensure smooth camera motion. To add the motorization to automatically move the camera, a stepper motor with a belt drive is used which is controlled by an Arduino. A few limit switches are added, letting the dolly perform different movement patterns automatically, and a pair of potentiometers for fine and coarse speed control are included as well, letting the camera take both time-lapse and video while using this mount at various controllable speeds.

With everything tucked into a relatively small box at one end of the dolly, the build is both accessible and functional. The code for the microcontroller is also available on the project’s GitHub page for anyone looking to replicate or build upon the project. And, for those looking to add more degrees of freedom to their camera setups, take a look at this DIY pan and tilt mount.

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