Calculate the perimeter of object in binary image how!!!!!!!
Hi
I try to use labview to find area and perimeter of object in binary using vision function
for the area the labview find it in pixel]
but for perimeter I have problem I read from ni.com vision manual this words
http://zone.ni.com/reference/en-XX/help/372916M-01/nivisionconcepts/particle_measurements/
"""Length of a boundary of a region. Because the boundary of a binary image is comprised of discrete pixels, NI Vision subsamples the boundary points to approximate a smoother, more accurate perimeter. Boundary points are the pixel corners that form the boundary of the particle. Refer to the introduction for an illustration of pixel corners."""
what is the problem I really did not understand what he mean::"""Because the boundary of a binary image is comprised of discrete pixels""
can any one explain to us the case please and who will lv find the perimeter
best regards
hi ?Q>
Hornless.Rhino wrote:
mangood wrote:
what is the problem I really did not understand what he mean::"""Because the boundary of a binary image is comprised of discrete pixels""
can any one explain to us the case please and who will lv find the perimeter
best regards
Take the following image on the left. You can see it is quite jagged.
Since pixels are square/rectangular you cannot have a perfectly straight edge on a line that is not horizontal or vertical.
But looking at how the edge of the object actually is, the jaggedness can be "smoothed out" and hence help determine what the perimiter should be were it perfectly smooth.
thank you
do you mean that lv do a low pass filter for image before he caculate the perimeter?????
finally which connectivity is best 4 or 8 for finding the perimeter??? or which algorthem used by lv to find the perimeter???
best regards
hi ?Q>
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</Event>Thank you excellent post! I confirmed this fix worked for my situation as well. Below is more detailed post since it did not jump out for me the first time.
############################ Details ##############################
My operating system is Windows 8.1 after installing Visual Studio 2013 when Symantec System recover 2013 ran started seeing
the following errors in event logs.
################## Example event log errors #######################
Cryptographic Services failed while processing the OnIdentity() call in the System Writer Object.
Details:
AddLegacyDriverFiles: Unable to back up image of binary Microsoft Link-Layer Discovery Protocol.
System Error:
Access is denied.
################## Example event log errors #######################
Note: Confirmed this fix resolved my issue.
Step 1. Download and unzip accesschk.exe to C:\Temp http://download.sysinternals.com/files/AccessChk.zip
Step 2. Run cmd.exe prompt as Administrator go to Temp directory
C:\>cd Temp
Step 3. Run accesschk.exe
C:\Temp>accesschk.exe -c mslldp
################# Example output 1 #################################
Accesschk v5.10 - Reports effective permissions for securable objects
Copyright (C) 2006-2012 Mark Russinovich
Sysinternals - www.sysinternals.com
mslldp
RW NT AUTHORITY\SYSTEM
RW BUILTIN\Administrators
RW S-1-5-32-549
R NT SERVICE\NlaSvc
################# Example output 1 #################################
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C:\Temp>SC sdshow MSLLDP <---- Example text 1.
################# Example output 2 #################################
D:(D;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BG)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;SY)(A;;CCDCLCSWRPDTLOCRSDRCWDWO;;;BA)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;SO)(A;;LCRPWP;;;S-1
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################# Example output 2 #################################
Step 5. Run following command.
C:\Temp>SC sdshow MUP
################# Example output 3 #################################
D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;IU)
(A;;CCLCSWLOCRRC;;;SU) ######## <--- Example text 2. Grab this value. #######
S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)
################# Example output 3 #################################
Step 6.
C:\Temp>
### Copy and past Example 1. line in notepad in command promt you can select all then copy the paste the text into notepad.
MSLLDP D:(D;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BG)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;SY)(A;;CCDCLCSWRPDTLOCRSDRCWDWO;;;BA)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;SO)(A;;LCRPWP;;;S-1-5-80-3141615172-2057878085-1754447212-2405740020-3916490453)
(A;;CCLCSWLOCRRC;;;SU) ######## <--- Insert Example text 2. here #######
S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)
Run this command. (Note: Make sure its all one line no wordwrap that the webpage could be showing this text.)
C:\Temp> sc sdset MSLLDP D:(D;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BG)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;SY)(A;;CCDCLCSWRPDTLOCRSDRCWDWO;;;BA)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;SO)(A;;LCRPWP;;;S-1-5-80-3141615172-2057878085-1754447212-2405740020-3916490453)(A;;CCLCSWLOCRRC;;;SU)S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)
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C:\Temp>accesschk.exe -c mslldp
################# Example output 4 #################################
Accesschk v5.10 - Reports effective permissions for securable objects
Copyright (C) 2006-2012 Mark Russinovich
Sysinternals - www.sysinternals.com
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RW NT AUTHORITY\SYSTEM
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R NT SERVICE\NlaSvc
R NT AUTHORITY\SERVICE <--- You should now see this line.
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Step 8.
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############################ Details ##############################
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