Dalsa’s Spyder 3 (Camera Link
or GigE) line scan camera.
‘Moving forward the introduction of solar
‘Area scan cameras are
panel production will continue to drive the
line scan market. But area scan sees the lion’s
becoming increasingly
share of the new applications.’
Area scan cameras are becoming increasingly
popular, say the experts’
popular, say the experts. Hickman continues:
‘Area scan cameras are defi nitely encroaching tend to lie in the optics and lighting that are
on some applications where only line scan used as part of the inspection system. Many
could be used, for example, area scan experienced system designers recommend you
cameras are now available with very high determine your lighting fi rst, which tends to
resolution sensors that have higher and higher be counterintuitive to how a less experienced
frame rates.’ system designer may approach the problem.’
It’s a VISION - And Linkemann adds: ‘Area scan and line Linkemann thinks alignment can pose a
scan cameras will be used in future. Due to the problem for line scan cameras. ‘Once a camera
It’s a community
fact that area scan cameras are easier to align, is connected to the system, either with a frame
Every year companies from all over the
area scan cameras will be the preference.’ grabber or by FireWire or Gigabit Ethernet,
there is no big difference,’ he says. ‘It is harder
world come to exhibit at VISION, the
Integrating issues to align a line scan camera, because the full
PICOLO V16 H.264
TM
leading trade fair in the machine vision
Williamson says: ‘The challenge for line scan image is not visible. The alignment of the line
is synchronising the line rate to the movement scan camera is challenging because it is not only
industry. And it is more and more as each
Video capture and H.264 compression board
of the product. If the two are not tied together the camera and the lens, it is also the light that
year goes by. They come from 28 different
for 16 video inputs with audio capabilities
the image will stretch or compress. The use has to match perfectly to the whole system.’
countries and encounter visitors from an
of quadature encoders to tie the product Hickman, too, can see the pluses and
16 video inputs PAL or NTSC
movement to the line rate solves this but it minuses of both technologies and says: ‘It
- Contrast, brightness and saturation controls available
endless variety of indus tries. Highly-
- Video presence detection
involves more engineering. Also, on line scan is more diffi cult to achieve correct illumination
- Overlay caption text and masking regions
qualified visitors who are ready to invest
at the higher speeds, the exposure time can with area scan cameras when compared to
H.264 on-board compression, 480/400 ips (30/25 ips x 16) at full resolution
be very short which often means the speed line scan, as area scan cameras generally have
and are in search of new products and
Precise hardware controlled time stamping
is limited to the amount of light that can be more limited resolution. Line scan cameras
Simultaneous and independent raw and compressed
application-oriented solutions. Will you be
delivered to the object.’ rely on a scanning movement – most often
-image transfer leading to a total of 32 video output streams!
But area scan can also throw up a few with an encoder set-up for controlling the line
16 audio inputs
one of them?
illumination problems, as Williamson acquisition. It is also generally more diffi cult
One video output with cascade capability
continues: ‘Area scan cameras have fewer to set up a line scan camera – alignment and
www.vision-messe.de
32 general-purpose I/O lines and watchdog capability
issues, as a single trigger to the camera will focus are more critical and dealing with the
grab the whole image. The key for higher data can be more complex.’
Information and registration
resolutions is getting even illumination over a Williamson summarises the decision-
Florian Niethammer
large area and the resolution of the lenses, as making process succinctly: ‘Area scan: simple,
they tend to have smaller pixels.’ easy to understand and implement; line
The compression standard that offers high image quality
Tel.: +49 (0)711 18560-2541
on top of low bit rate and low storage requirement
Butler adds: ‘Feedback from system scan: great for higher speeds and continuous
Fax: +49 (0)711 18560-2657
designers indicates that the biggest challenges inspection.’
E-mail: fl orian.niethammer@messe-stuttgart.de
www.euresys.com *Subject to PC bus available bandwidth
Ad_PicV16H264En_MachVisEur_Dec08_Cor0.indd 1 10/12/2008 12:08:54
IMVEfeb09 pp20-23 Lines.indd 22 18/2/09 15:21:42
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