line number in the frame

[bugmaker]

Hi

I take two frames one after another from a externally trigged camera. Can someone help me with a hint on how I can find (detect) the line number on the frame where the object appears, ie  where the object starts in the image?

Bugi

[Robert_Eastlund]

Dear Bugi,

Are you working with the National Instruments Vision Development Module?

-Robert

[bugmaker]

Yes I do. I do use NI Vision on this application.

Bugi

[Robert_Eastlund]

Dear Bugi,

Please upload an image of the object.

-Robert

[bugmaker]

Here it is

It needs thresholding (Thr=117) but the point is I can't find the line number where the object appears in the image.

Bugi

[Robert_Eastlund]

Dear Bugi,

I am going to assume that the object is entering the image from the right side.  If this is the case, you can threshold the image, use the particle filter to remove any unwanted particles, then use the First Pixel X value from the Particle Analysis funtion to determine the starting position of the object.

-Robert

[bugmaker]

Dear Robert, thanks

Yeah it's seems it functions but I get that info from Bounding left value not from First X. First X actually shows the value that corresponds with the end of the frame ?!. Can you execute the recommended analysis and see yourself the values from particle analysis to undertsand what I mean.

Bugi 

[BruceAmmons]

Particle analysis gives you the four boundaries of the object.  What do you need that these don't give you?

Bruce