Machine vision - Area or line scan?

[mitulatbati]

Hi all,

I have found a description about digital cameras for machine vision systems, it is clear:

http://zone.ni.com/devzone/cda/tut/p/id/3287

But in what kind of application should be chosen the LINE SCAN type?

BR

MB

[Sundar...]

Hi,

Line Scan cameras are ideal for a variety of applications including:

Document scanning, print inspection, web inspection,

production line item inspection, OCR and 2-D bar code reading, and many other applications.

Wherein one doesnt require to scan a large area.

Regards,

Sundar.

[AnalogKid2DigitalMan]

See the paragraph for Line scan cameras from Wiki:

http://en.wikipedia.org/wiki/Digital_camera#Line-scan_camera_systems

[Wiebe@CARYA]

Typically, you'd choose a line scan camera if the object itself is moving.
Since the 'image' you get is 1Xwidth pixels, you can use the frames over
time to construct a 2D image. One frame could be used to detect a dark to
light transition, for instance to detect the height of an object.

As I recall the line scan cameras are typically more expensive then normal
camera's (even more if you calculate the price per pixel). So one would only
use one if it is required. And that is only the case if you need high
troughput of 1Xwidth pixels. That is the one benefit of line scan cameras:
where standard area cameras capture 10-100 fps, line scan cameras can do
this about hundreds of times faster (since it has hunders of times less data
to transfere).

Regards,

Wiebe.

[rajku]

As Wibe mentioned :

Here are the following Use case for Line scan cameras

   - Object is moving at very high speed.

   - Dimensioning [ measurement ]. When the measurement has to be done in microns. Line scan are the best. [because Resolution of measurement depends on the object speed. lesser the more accurate ]

   - More Accurate identification of Spots or foreign materials of very small size. [ inspection of garments