555356

NI Vision NI 17xx Manual

40
Zoom out
Zoom in
Previous page
1/90
Next page
© National Instruments Corporation 5-1 NI 17xx Smart Camera User Manual
5
Image Acquisition
This chapter contains information about acquiring images with the
NI Smart Camera and explains the relationships between triggering,
lighting, and exposure.
Exposure
The NI Smart Camera provides control of the image sensor exposure time
through software. The exposure time is the amount of time that light is
allowed to strike the sensor to produce an image. When light strikes the
surface of the sensor, it dislodges electrons. As more light strikes the
sensor, more electrons are freed, creating a charge on the sensor.
For a given amount of light, the sensor collects more charge during a longer
exposure time than a shorter exposure time. Because the charge is what is
read out to produce the image, it is important to have an optimal amount of
light and exposure time for your application.
Exposing the image sensor for too short of a time relative to the amount of
light in the environment results in a dark, low contrast image. Exposing the
image sensor for too long of a time relative to the amount of light in the
environment results in a bright, low contrast image. When the image sensor
is exposed for an appropriate amount of time relative to the light in the
environment, acquired images will exhibit appropriate contrast to easily
distinguish both dark and light features. Contrast is a key factor in obtaining
good results from image processing algorithms.
In applications where the object under inspection is moving, the exposure
time must be carefully considered. If the object moves significantly during
the exposure, the resulting image is blurry and unsuitable for processing.
The maximum exposure time for imaging a moving object without blurring
depends on the per pixel spatial resolution and the rate of motion of the
object. The per pixel spatial resolution is the field of view, calculated in
the Field of View section of Chapter 3, NI Smart Camera Image Sensor,
divided by the number of pixels in the sensor. Together, this information
… 40 …


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for NI Vision NI 17xx at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of NI Vision NI 17xx in the language / languages: English as an attachment in your email.

The manual is 1,68 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info