NI vision progressive scan

[constructionworker]

I'm trying to get a progressive scan image from the webcam, but I have no idea how this could happen.I've read a few articles but have no idea how to set this to labview.Does anyone have worked on this issue before, every idea is valuable.

[rolfk]

What's the purpose of this? The sensors of most webcams work in whatever mode they are designed for and allow for little or no control of that. If they are progressive scan, most are in fact, or not is usually a design choice not a programmer choice. Such programmability makes a webcam a few cents more expensive and requires a more complex driver, and that is a lot of money to loose when you compete with Chinese manufacturing margins.

And even if the sensor would allow such control, the standard webcam access APIs in Windows do not give the user such control. You would need to go with a custom device driver and according custom user API.

[constructionworker]

First of all hello, thanks for such a detailed answer.I assume you know the Potplayer program. Potplayer software can record or show videos recorded with the scan type progressive.
So I want to ask the following question: When video is taken from the camera with Labview NI vision, is interlaced scan type used or is it progressing?

[constructionworker]

Regardless of the default scan type of the camera, if you say NI-vision takes the default scan type image, I would like to ask a question, how can we understand the scan type of a camera with labview.

[rolfk · Accepted solution]

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@constructionworker wrote:

First of all hello, thanks for such a detailed answer.I assume you know the Potplayer program.

Nope!

Potplayer software can record or show videos recorded with the scan type progressive.
So I want to ask the following question: When video is taken from the camera with Labview NI vision, is interlaced scan type used or is it progressing?

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I would assume that it is whatever is the default of the underlaying webcam driver. While the DirectShow interface allows to configure lots of things of a camera, it is tedious to do so and very prone to omissions and bugs in the according camera driver. LabVIEWs camera acquisition interface does NOT expose all those options since there is no common standard for that. The only thing that is exposed in IMAQdx are GeniCam compatible properties for drivers that expose such an interface. DirectShow is NOT such a driver interface.

[constructionworker]

Well, I want to ask a question like: What are the scan types of Usb webcam cameras usually interlaced or progressive? We can't understand this with labview, right?