hms2006

Thanks for your reply, you maybe wrongly to take what i mean, the polygon is in a matrix of N*64, and i think i have a mehod to realize this, thank you again!

Hi,

i want to get the boundary of a polygon using the labview. As the polygon is input in a matrix of 1 and 0, and 0 means the shadow of the polygon,

so i need to get the index of 0 around the polygon (the boundary), is there any  algorithm in labview to realize this ?

Thank you!

Get it, thanks for Infitenothing!

Hi, guys, 

From the attached image, you can see a stellar form image in black, and some annotation  in x, y, d, w , r .

x and y are just that we use in cartesian coordinate system; and d is the maximum dimension of the image, which is the span of the particle projected onto a line determined by a least-squares fit of the x and y positions of all occultations; w is the span of the particle projected onto the line perpendicular to that used for d; and r is the correlation coefficient from the least-squares fit.

The data of the image is structured in an array with 0 and 1, which is very easy for me to get the dimension in x and y direction. But i really don't know how to get the dimension d, w and r in least-squares fit methods. If i want to realize it  in labVIEW G language, can you give me some tips or codes in LabVIEW.

Thanks!