What are the benefits of CMOS based machine vision cameras vs CCD?

Industrial machine vision cameras historically have used CCD image sensors, but there is a transition in the industrial imaging marketplace to move to CMOS imagers. Why is this?.. Sony who is the primary supplier of image sensors announced in 2015 it will stop making CCD image sensors and is already past its last time buy. The market was nervous at first until we experienced the new CMOS image sensor designs. The latest Sony Pregius Image sensors provide increased performance with lower cost making it compelling to make changes to systems using older CCD image sensors.

click here for sony pregius image sensors
Listing of all Sony Pregius Image sensors with filter selection tools

What is the difference between CCD and CMOS image sensors in machine vision cameras?

Both produce an image by taking light energy (photons) and convert them into an electrical charge, but the process is done very differently.

In CCD image sensors, each pixel collects light, but then is moved across the circuit via current through vertical and horizontal shift registers. The light level is then sampled in the read out circuitry. Essentially its a bucket brigade to move the pixel information around which takes time and power.

In CMOS sensors, each pixel has the read out circuitry located at the photosensitive site. The analog to digital circuit samples the information very quickly and eliminates artifacts such as smear and blooming. The pixel architecture has also radically changed moving the photosensitive electronics to be more efficient in collecting light.

CCD vs CMOS
Courtesy of Automated Imaging Association

6 advantages of CMOS image sensors vs CCD

There are many advantages of CMOS versus CCDs and outlined below:
1 – Higher Sensitivity due to the latest pixel architecture which is beneficial in lower light applications.
2 – Lower dark noise will contribute to a higher fidelity image.
3 – Pixel well depth (saturation capacity) is improved providing higher dynamic range.
4 – Lower Power consumption. This becomes important as lower heat dissipation equals a cooler camera and less noise.
5 – Lower cost! – 5 Megapixel cameras used to cost ~ $2500 and only achieve 15 fps and now cost ~ $450 with increased frame rates.
6 – Lens selection becomes easier as sensor formats have decreased with smaller pixels.

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What CMOS image sensors cross over from existing CCD image sensors?

1stVision can help in the transition starting with crossing over CCDs to CMOS using the following cross reference chart. Once identified, use the camera selector and select the sensor from the pull down menu.

Sony CCD to CMOS cross reference chart

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

Ph:  978-474-0044  /  info@1stvision.com  / www.1stvision.com

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Guide to understanding Machine Vision interface standards

Machine Vision standards have evolved providing defined models of how industrial cameras communicate to a PC allowing easier implementation of machine vision technology. Vision systems can be made up of cameras, frame grabbers and vision libraries from various manufacturers. The vision standards provides compatibility between the various manufacturers for easy implementation.

Machine vision applications require some basic tasks of finding and connecting to the cameras, configuring parameters, acquiring images and dealing with events to and from the cameras.

machine vision interface  - GENICAM

In order to provide cameras from various manufacturers to work together with 3rd party software and hardware from other manufacturers and provide the tasks above, a standard must be followed. “GenICam” is the basis for this standardization, providing compatibility using a Generic Transportation layer and Generic Application programming interface. These are referred to as “GenTL” and “GenAPI” respectively. GenTL provides the communication layer and GenAPI enables camera features to be configured by analyzing a compliant XML file for the camera.

Camera manufacturers however provide unique independent features providing various advantages from one to another. Creating these unique features blur the lines of the standard, not always making a camera fully compatible with another manufacturers software. For example, an industrial camera may use the GenTL layer to be recognized but may have special features making it unique as well.

This can be very confusing to understand! IDS Imaging has a white paper explaining the machine vision interface standardization, GenTL, GenAPI and the system architecture . CLICK BELOW NOW TO DOWNLOAD!

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

Ph:  978-474-0044  /  info@1stvision.com  / www.1stvision.com

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What is the fastest 2.4MP GigE camera at the lowest price point? Dalsa’s new Nano M1950 / C1950!

Dalsa Nano

Dalsa NanoTeledyne Dalsa has released the latest addition to the Genie Nano family.  Introducing the Nano M1950 and C1950 cameras using the Sony Pregius IMX392 image sensor.  This is a great replacement for older Sony ICX818 CCD sensors.

These latest Nano models offer 2.4 MP (1936 x 1216) resolution with a GigE interface in color and monochrome with up to 102 frames per second utilizing TurboDrive.

What’s so interesting about the Nano M1950 and C1950 models?

2.4 MP resolution with the speed of the popular IMX174, but at the price of the IMX249:  
Sony Pregius image sensors in a given resolution has created paired sensors, one being faster at a higher price and one slower at a lower price.  The Nano M1940 / C1940 cameras use the IMX174 which is a great sensor and historically had the fastest speed at 2.4MP in GigE, but at a premium.  We could opt for the Nano M1920 / C1920 cameras with the IMX249 at a lower price, but sacrificed speed.

Until now! – The latest Nano M1950 / C1950 models with the IMX392 provides the higher speed of the M1940 / C1940 cameras, but at the lower price of the Nano M1920 / C1920 cameras. 

2.4MP resolution using a 1 /2 in sensor format, provides cost savings on lenses.
Thanks to the Sony Pregius Gen 2 pixel architecture, the pixel size is 3.45um, allowing the same resolution and eliminating the added cost of larger format lenses found in the IMX174 / IMX249 sensors which were 1 / 1.2″ formats.

Contact 1stVision to get our recommendations on lens series designed for the 3.45um pixel pitch. 

When would you use the Sony Pregius IMX392 versus the IMX174 and IMX249 sensors? 

The Sony Pregius IMX174 / IMX249 images still have an incredible dynamic range due to the pixel architecture found in the first generation image sensors.  (Read more here on Gen 1 vs Gen 2).  If you need dynamic range, with large well depths of 30Ke-, then use the IMX174 / IM249 sensors.

I’m so confused!   Where can I get the specs on the new Nano M1950 / C1950, understand what sensors are in what cameras and get a quote?

The tough part today, is that there a ton of model #’s in the Sony Pregius sensors lineup and in turn camera product lines.  Here’s a brief table to help with links to spec’s, related image sensors and a link to get a quote.

Sensor          Model 
IMX174         Nano M1940 / C1940          GET QUOTE
IMX249        Nano M1920 / C1920           GET QUOTE
IMX392        Nano M1950 / C1950           GET QUOTE

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

Contact us to help in the specification and providing pricing

Ph:  978-474-0044  /  info@1stvision.com  / www.1stvision.com

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Sony Pregius sensor “Generations” – What do those differences mean for machine vision?

Teledyne Dalsa TurboDrive 2.0 breaks past GigE limits now with 6 levels of compression

What is a lens optical format? Can I use any machine vision camera with any format? NOT!

Sony Pregius sensor “Generations” – What do those differences mean for machine vision?

Sony Pregius

Pregius
Courtesy of Sony
Machine Vision cameras continue to reap the benefits of the latest CMOS image sensor technology since Sony announced the discontinuation of CCD’s.  We have been testing and comparing various sensors over the years and have always come back to using Sony Pregius sensors when dynamic range and sensitivity is needed.

If you’ve been watching the technology shift from CCD’s to CMOS, you have probably also seen a ton of new image sensor names within the “Generations”.  Honestly, its hard to keep track of all of Sony’s part numbers, so we will try to give you some insight into the progression of Sony’s Pregius image sensors used in industrial machine vision cameras.

1 – First, how can I tell if its a Sony Pregius generation sensor?

Sony has prefixes of the image sensors which make it easy to identify if its an ExView HAD sensor or Pregius sensor.  Previous CCD, EXViewHAD sensors primarily in the last 10 years had a prefix of “ICX”.  Example:   ICX285, which was a great sensor back in the day.   All new Sony Pregius sensors have a prefix of “IMX”    Example:  IMX174.. which today is one of the best for dynamic range.
1stVision’s camera selector can be filter by “Resolution” and you can scroll and see the sensors with a prefix of IMX.  CLICK HERE NOW

2 – What is the differences in the “Generations” of Sony Pregius Image sensors?

Sony Pregius Generation 1:  This primarily consisted of a 2.4MP resolution sensor with 5.86um pixels BUT had a well depth (saturation capacity) of 30Ke- and still unique in this regard within the generations.   Sony also brought the new generations to the market with “slow” and “fast” versions of the sensors at two different price points.  In this case, the IMX174 and IMX249 were incorporated into industrial machine vision cameras providing two levels of performance.  Example being Dalsa Nano M1940 (52 fps)  using IMX174 vs Dalsa Nano M1920 (39 fps) using IMX249, but the IMX249 is 40% less in price.

Sony Pregius Generation 2:  The primary goal of Sony was to expand the portfolio of Pregius sensors which consists of VGA to 12 MP image sensors.  However, the pixel size decreased to 3.45um along with well depth to ~ 10Ke-, but noise also decreased!  The smaller pixels allowed smaller format lenses to be used saving overall system cost.   However this became more taxing on lens resolution being able to resolve the 3.45um pixels!   In general it offered a great family of image sensors and in turn an abundance of machine vision industrial cameras at lower cost than CCD’s with better performance.   

1stVision’s camera selector  can be filter by “Resolution” AND pixel size that correspond to one of the generations.  You will have a list of cameras in which you can select those starting with IMX!.  I.e  All Generation 2 sensors will be 3.45um, and can narrow to a desired resolution. CLICK HERE NOW

Sony Pregius Generation 3:  Sony’s has taken the best of both the Gen 1 and Gen 2 to create Gen 3!  The pixel size increased to 4.5um increasing the well depth to 20Ke-!  This generation has the fastest data rates, dynamic range and lowest noise.  The family will expand from VGA to 7.1MP as well.  We are just starting to see Gen 3 sensors in our machine vision camera lineup and expecting more to come through 2019+.

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Sony Pregius image sensor Comparison Chart

sony comparison chart

Sony’s Pregius Product line up for machine vision industrial cameras below for reference as of April 2019

Sony Pregius product line up
Courtesy of Sony

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

Contact us to help in the specification of your imaging components 

Ph:  978-474-0044  /  info@1stvision.com  / www.1stvision.com

How can we help answer your questions about industrial imaging?  We have used several terms you may not be familiar with and would like to help in your education.  Below are some related blogs that will help.  Or contact us via email or phone number as we love to help educate our customers!

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