Halcon snap, get the area and position of coins

* Image Acquisition 02: Code generated by Image Acquisition 02
open_framegrabber ('DirectShow', 1, 1, 0, 0, 0, 0, 'default', 8, 'gray', -1, 'false', 'default', '[1] Webcam C170', 0, -1, AcqHandle)
grab_image_start (AcqHandle, -1)
dev_close_window ()
dev_open_window (0, 0, 718, 512, 'black', WindowHandle)
while (true)
    grab_image_async (Image, AcqHandle, -1) 
    threshold (Image, Region, 145, 254)
    dev_display (Region)
    opening_circle (Region, RegionOpening, 15)
    dev_display (RegionOpening)
    connection (RegionOpening, ConnectedRegions)
    dev_display (ConnectedRegions)
    select_shape (ConnectedRegions, SelectedRegions, ['area','circularity'], 'and', [100,0.49719], [10000,2])
    dev_display (SelectedRegions)
    area_center (SelectedRegions, Area, Row, Column)# Get the area and center of the area
    *smallest_circle (SelectedRegions, Row, Column, Radius)
    *Diameter := 2*Radius
    *disp_circle (WindowHandle, Row, Column, Radius)
    disp_message (WindowHandle, ' area ：'+Area+' Central coordinates ：'+Row+' '+Column, 'window', 0, 0, 'blue', 'true')
    *disp_message (WindowHandle, 'D: ' + Diameter$'.4', 'image', Row - 2 * Radius, Column, 'white', 'false')
endwhile
close_framegrabber (AcqHandle)