Author: 1stVision

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3D IDS Ensenso C (Color) Series

Sometimes just the Z-values are enough, no image needed at all. Some applications require pseudo-images generated from a point cloud – whether in monochrome or with color tones mapped to Z values. Yet other applications require – or benefit from – 3D digital point cloud data as well as color rendering. IDS Ensenso’s C Series provides stereo 3D imaging with precise metrics as well as true color rendering.

Two models of Ensenso stereo cameras – Images courtesy of IDS

If you want an overview of 3D machine vision techniques, download our Tech Brief. It surveys laser triangulation, structured light, Time of Flight (ToF), and stereo vision. If you know you want stereo vision, you might like an overview of all IDS Ensenso 3D offerings.

But if you know you want stereo 3D accuracy to 0.1mm, with color rendering, let’s dive in to the IDS Ensenso C Series. If you prefer to speak with us instead of reading further, just call us at 978-474-0044, or request that we follow up via our contact form.

Key differentiator is “projected texture”

In the short video below, we see 3 scene pairs. For each pair, the leftmost images are the unenhanced 3D image. The rightmost images take advantage of the projected texture created by the LED projector and the RGB sensor, augmenting the 3D point cloud with color information. It can be a differentiator for certain applications.

Video courtesy of IDS

Application areas

Let’s start with candidate application areas, from customer perspective, before pointing out specific features. In particular let’s look at application areas including:

  • Detect and recognize
  • Bin picking
  • De-palletizing
  • Test and measure

Detect and recognize

The ability to accurately detect moving objects to select, sort, verify, steer, or count can enhance (or create new) applications. Ensenso C’s high-luminance projector enables high pattern contrast for single-shot images. Video courtesy of IDS.

Bin picking

Regardless of a robot’s gripping sensitivity, speed, and range of motion, 3D imaging accuracy is central to success. Ensenso C’s integrated RGB sensor can make all the difference for color-dependent applications. Video courtesy of IDS.

De-palletize

De-palletizing might seem like a straightforward operation, but must detect object size, rotation and position even with different and densely stacked goods. Ensenso C supports all those requirements – even from a distance. Video courtesy of IDS.

Test and measure

Automated inspection and measurement of large-volume objects are key for many quality control applications. Precision to the millimeter range can be achieved with Ensenso C at working distances even to 5m. Video courtesy of IDS.

IDS Ensenso C Series

With two models to choose from, Ensenso C supports a range of working distances and focal distances – see specifications.

Both models utilize GigE Vision interface; both embed a 200W LED projector; both use C-mount lenses; both provide IP 65/67 protection. And both models are easy to configure with the Ensenso SDK: Windows or Linux; sample programs including source code; live composition of 3D point clouds from multiple viewing angles; robot eye-hand calibration; and more.

1st Vision’s sales engineers have over 100 years of combined experience to assist in your camera and components selection.  With a large portfolio of lenses, cables, NIC card and industrial computers, we can provide a full vision solution!

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Test your parts in 3D lab

Have you wondered if 3D laser profiling would work for your application? Unless you have experience in 3D imaging, for which laser profiling is one of several popular methods, you may be uncertain of the fit for your application. Yes, one can read a comprehensive Tech Briefs on 3D methods, or product specifications, but wouldn’t it be helpful to see some images of your parts taken with an actual 3D Laser Profiler?

Image courtesy Teledyne DALSA.

While prototyping at your facility is of course one option, if your target objects can be shipped, Teledyne DALSA has a Z-Trak Application Lab, whose services we may be able to arrange at no cost to you. Just describe your application requirements to us, and if 3D laser profiling sounds promising, the service works as follows:

  1. Send in representative samples (e.g. good part, bad part)
  2. We’ll configure Z-Trak Application Lab relative to sample size, shape, and applications goals, and run the samples to obtain images and data
  3. We’ll send you data, images, and reports
  4. Together we’ll interpret the results and you can decide if laser profiling is something you want to pursue

Really, just send samples in? Anything goes? Well not anything. It can’t be 50 meters long. Maybe a 15 centimeter subset would be good enough for proof of concept? And if the sample is a foodstuff, it can’t suffer overnight spoilage before it arrives.

A phone conversation that discusses the objects to be inspected, their dimensions, and the applications goal(s) is all we need to qualify accepting your samples for a test. Image courtesy of Teledyne DALSA.

Case study

In this segment, we feature outtakes from a recent use of the Z-Trak Application Lab, for a customer who needs to do weld seam inspections. The objective is to image a metal part with two weld seams using a Z-Trak 3D Laser Profiler and produce 3D images for evaluation of application feasibility. The images and texts shown here are taken from an actual report prepared for a prospective customer, to give you an understanding of the service.

Equipment:

  • Z-Trak LP1-1040-B2
  • Movable X,Y stage
    X-Resolution: ~25 um
    Y-Resolution: 40 um
    WD: ~50 mm

Image courtesy Teledyne DALSA

Conditions:
The metal part was laid flat on the X,Y stage under the Z-Trak. The stage was moved
to scan the part.

To the right, see the image generated from a perpendicular scan of the metal part. Image courtesy Teledyne DALSA.

The composite image below requires some explanation. The graphs on the middle column, from top to bottom, show Left-Weld-Length, Right-Weld-Length, and Weld-Midpoint-Width (between the left and right welds), respectively. The green markup arrows help you correlate the measurements to the image on the left. The rightmost column includes summary measurements such as Min, Max, and Mean values.

Image courtesy Teledyne DALSA

Now have a look at a similar screenshot, for Sample #2, which includes a “bad weld”:

Image courtesy Teledyne DALSA

With reference to the image above, the customer report included the following passage:

The top-right image is the left weld seam profile. In the Reporter window the measurement of this seam is 1694.79 mm long. However, a defect can be noted at the bottom of the left weld. In addition to the defect it can be seen from the profile that the weld is not straight in the Z-direction. The weld is closer to the surface at the top and further from the surface at the bottom

Translation: The automated inspection reveals the defective weld! Naturally one would have to dig in further regarding definitions of “good weld”, “bad weld”, tolerances, where to set thresholds to balance yields and quality standards vs. too many false positives, etc.

Conclusion

The report provided to the customer concluded that “This application is feasible using a Z-Trak 3D Laser Profiler.” While it’s likely that outcome will be achieved if we qualify your samples and application to use the Z-Trak Application Lab service, it’s not a foregone conclusion. We at 1stVision and our partner Teledyne DALSA are in the business of helping customers succeed, so we’re not going to raise false hopes of application success.

Recap

To summarize, the segments above are representative outtakes from an actual report prepared by the Z-Trak Application Lab. The full report contains more images, data, and analysis. Our goal here is to give you a taste for the complimentary service, to help you consider whether it might be helpful for your own application planning process.

Next steps?

To learn more, see a recent blog “Which Z-Trak 3D camera is best for my application?“. Or have a look at the Z-Trak product overview.

If you’d like to send in your parts, please use this “Contact Us” link or the one below. In the ‘Tell us about your project’ field, just write something like “I’d like to have parts sent to the Z-trak lab.” If you want to write additional details, that’s cool – but not required. We’ll call to discuss details at your convenience.

1st Vision’s sales engineers have over 100 years of combined experience to assist in your camera and components selection.  With a large portfolio of lenses, cables, NIC card and industrial computers, we can provide a full vision solution!

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High-Resolution 360° optics by Opto Engineering

Who needs 360° optics? Granted, it’s specialized stuff. Innovative lenses in Opto Engineering’s series enable single-camera inspection of objects many users might not have thought possible! For example, a Bi-Telecentric system uses mirrors to image all 4 sides of an object at once, without moving the camera or the object. Or a boroscope gets the optics and a light inside a tight space, creating a panoramic view of the interior.

Even experienced machine vision professionals may never have seen or heard of some of these specialized optics. Unless one knows of such lens systems, one might try to design a multi-camera system for an application, when in fact a single camera could have been used!

In the segments below, we highlight categories for which there are lens series available, together with representative images, diagrams, and texts. The goal here is not a master class in optics – just an overview to raise awareness.

Pericentric lenses

Opto Engineering provides pericentric lenses, allowing 360° by 180° FOV from a position above an object. That provides 360° top and lateral views with a single camera. The PC Series, with five choices, are designed to perform complete inspection of objects up to 60 mm in diameter. Typical applications include bottleneck thread inspection and data matrix reading – the code will always be properly imaged regardless of its position.

Suppose you produce and pack a product in a plastic container such as the one shown here. Quality control inspections may require verifying each container is labeled with print, graphical, and/or coded information. Image courtesy Opto Engineering.

Below we see the top and sides imaged in a single exposure, using a PC lens:

Image generated with a pericentric lens from the PC Series – Courtesy Opto Engineering.

The PCCD Series, with four members, enables the 360° side view of small objects (sample diameter 7 – 35 mm). Perfect for bottle cap and can inspection.

Images courtesy Opto Engineering

Above, the top image is generated from a lens that uses both reflection and refraction to image the vial’s interior as well as the exterior “shoulder”. The interior check is for any impurities before filling, and the exterior aspect is to obtain OCR characters or bar codes for tracking.

Hole inspection lenses

The PCHI Series includes 10 members, covering a range of sensor sizes, and includes a liquid lens option for adjustable focus control. Unlike a common lens with a flat field of view (FOV), these lenses provide a focused view of both the cavity bottom as well as the interior sidewalls! Perfect for thread inspection or cavity checks for contamination from above the cavity entrance.

PCHI Series hole inspection lenses and applications – Image courtesy Opto Engineering.

Bi-Telecentric lens systems

Many are familiar with telecentric lenses, which hold magnification constant, regardless of an object’s distance or position in the field of view. Consider Opto Engineering’s Bi-Telecentric Series, TCCAGE. Using multiple mirrors, parts can be measured and inspected horizontally from each 90, with no rotation required. Two different illumination devices are built into the system to provide either backlight or direct part illumination. In the example to the right, syringes are inspected for length and angle from all 4 directions.

Image courtesy of Opto Engineering.

Boroscopic probes

A boroscope gets the optics into tight spaces, for panoramic cavity imaging from the inside. The PCBP series includes built-in compact illumination. It’s ideal for 360 degree inspection of interiors with static parts.

Image courtesy of Opto Engineering.

Focus controls

In addition to fixed focus and manual focus (with lockring) options, some lenses in the PCHI and PCBP Series include Adjustable Focus (AF) features. With liquid lens technology, using AF these lenses with varying product sizes and dimensions just got easier. With millisecond repositioning, it allows extremely fast changes to focus to allow you to dial in the exact position on multiple size products or sizes for inspection of an even wider range of SKU with a single system.

If your imaging application can be solved with more conventional lenses, lucky you. But if your requirements might otherwise be impossible to address, or seemingly need two or more separate cameras, or complex rotation controls and multiple exposures, call us at 978-474-0044. You might not have realized there are specialized optics designed precisely for your type of application!

1st Vision’s sales engineers have over 100 years of combined experience to assist in your camera and components selection.  With a large portfolio of lenses, cables, NIC card and industrial computers, we can provide a full vision solution!

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Optimize wavelength to maximize contrast

Seasoned machine vision practitioners know that while the sensor and the optics are important, so too is lighting design. Unless an application is so “easy” that ambient light is enough, many or most value-added applications require supplemental light. “White” light is what comes to mind first, since it’s what we humans experience most. But narrow-band light – whether colored light within the visible spectrum, or non-visible light with a sensor attuned to those frequencies – is sometimes the key to maximizing contrast.

Gold contrasts better with red light than either white or blue – Image courtesy of CCS America

In the illustrations above, suppose we have an application to do feature identification for gold contacts. The ideal contrast to create is where gold features “pop” and everything that’s not gold fails to appear at all, or at most very faintly. If the targets that will come into the field of view have known properties, one can often do lighting design to achieve precisely such optimal outcomes

In this example, consider the white light image in the top left, and then the over-under images created with red and blue light respectively. The white light image shows “everything” but doesn’t really isolate the gold components. The red light does a great job showing just the gold (Au). The blue light emphasizes silver (Ag). The graph to the right shows four common metals relative to how they respond under which (visible) wavelengths. Good to know!

For an illustrated nine-page treatment of how various wavelengths improve contrast for specific materials or applications, download this Wavelength Guide from our Knowledge Base. You may be able to self-diagnose the wavelength ideal for your application. Or you may prefer to just call us at 978-474-0044, and we can guide you to a solution.

To the left we see 5 plastic contact lens packages, in white light. Presence/absence detection is inconclusive. Image courtesy of CCS America.

With UV light, a presence/absence quality control check can be programmed based on a rule that presence = 30% or more of the area in each round renders as black. Image courtesy of CCS America.

It all comes down to the reflection or absorption characteristics of specific properties with respect to certain wavelengths. Below we see a chart showing the peaks of some of the more commonly used wavelengths in machine vision.

Commonly used wavelengths – Image courtesy CCS America

For more details on enhancing contrast via lighting at specific wavelengths, download this Wavelength Guide from our Knowledge Base. Or click on Contact Us so we can discuss your application and guide you. 1stVision has several partners with different lighting geometries and wavelengths to create contrast. All three partners are in the same business group. CCS America and Effilux offer a variety of wavelengths (UV through NIR) and light formats (ring light, back light, bar light, dome). Gardasoft has full offerings for lighting controls. Tell us about your application and we’ll help you design an optimal solution.

1st Vision’s sales engineers have over 100 years of combined experience to assist in your camera and components selection.  With a large portfolio of lenses, cables, NIC card and industrial computers, we can provide a full vision solution!