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Re: extract circle from data with idl [message #94786 is a reply to message #94781]

Thu, 12 October 2017 05:10

termybel
Messages: 5
Registered: October 2017

Junior Member

Thanks to answer but I have a probelm.

You puth this: if n_elements(li) ne 1 then message, 'not exactly 1 contour'

and my program say: not exactly 1 contour

How I can solve it?

If I ask in idl " help,/str,li" and the answer is:

Structure CONTOUR_DBL_PATH_STRUCTURE, 6 tags, length=24, data length=20:
TYPE BYTE 1
HIGH_LOW BYTE 1
LEVEL INT 0
N LONG 7
OFFSET LONG 0
VALUE DOUBLE 9.0000000

and for " help,/str,lines"
LINES DOUBLE = Array[2, 5447]

My contour isn't a perfect circle. Maybe is this the problem?

This is my program where the image is a flat field panel minus dark:

file_ff1='ff_100s_3.fits' ;immagine
immagine_ff1=readfits (file_ff1, header1) ; leggo l'immagine del flat field panel
file_dark='ff_100s_dark_3.fits' ;immagine
immagine_dark=readfits (file_dark, header1) ; leggo l'immagine della dark

n=100. ; secondi di esposizione dell'immagine
ffp=(immagine_ff1-immagine_dark)/n

; contour per selezionare soglie di equivalore

speriamo=fltarr(2048,2048) ; creo una matrice 2048x2048
dimensioni=size(speriamo,/dimensions)
cubo=where(ffp lt 9.5 or ffp gt 10)

wrong_matrix=array_indices(dimensioni, cubo,/dimensions)
indxw=reform(wrong_matrix(0,*))
indyw=reform(wrong_matrix(1,*))
;ffp(indxw,indyw)=0.
;c = CONTOUR(ffp, dimensions=[512,512], Title='prova cubo')

; DATA being the data to be contoured
level=9
contour, smooth(ffp(250:1700, 250:1700),3), path_info=li,closed=1 , path_xy=lines, /path_data_coord, levels=[level], /path_double
; lix=lines(0,*)
; liy=lines(1,*)
; liyd=deriv(lix,liy)
;ind=where(abs(liyd) le 0.0001)

if n_elements(li) ne 1 then message, 'not exactly 1 contour'

cont_obj =obj_new('IDLanROI',lines)
void= cont_obj.ComputeGeometry(centroid=center)
;fit_ellipse(
print, center[0:1]

end

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[Message index]

		extract circle from data with idl By: termybel on Wed, 11 October 2017 05:23
		Re: extract circle from data with idl By: Markus Schmassmann on Wed, 11 October 2017 05:41
		Re: extract circle from data with idl By: termybel on Thu, 12 October 2017 05:10
		Re: extract circle from data with idl By: Markus Schmassmann on Thu, 12 October 2017 07:27
		Re: extract circle from data with idl By: termybel on Sun, 15 October 2017 08:43
		Re: extract circle from data with idl By: termybel on Sun, 15 October 2017 09:08
		Re: extract circle from data with idl By: Markus Schmassmann on Mon, 16 October 2017 02:20
		Re: extract circle from data with idl By: termybel on Mon, 16 October 2017 03:23
		Re: extract circle from data with idl By: Helder on Wed, 11 October 2017 05:47

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