[Sikuli-driver] [Question #207285]: image comparison fails
New question #207285 on Sikuli:
https://answers.launchpad.net/sikuli/+question/207285
Hi,
I'm struggling with sikulis image matching possibilities. I'm testing if a
website loaded correctly. The test fails if a blank page shows up.
1) First approach:
Look into screen region and test if blank_page.png (1021x672 pixel) exists.
#screen region // screen size ipad
screenRegion = Region(1,43,1020,804)
#create match object
imageBlank = Pattern("blank_page.png")
if screenRegion.exists(imageBlank):
print "debug: blank screen, website failed to load correctly"
else:
print "ok"
2) Second approach:
Make a screenshot of the website and test if it's blank.
screenRegion = Region(1,43,1020,804)
imageScreenRaw = capture(screenRegion)
#match object
imageScreen = exists(imageScreenRaw)
#region from screenshot
imageScreenRegion = Region(imageScreen)
imageBlank = Pattern("blank_page.png")
if imageScreenRegion.exists(imageBlank):
print "debug: blank screen, website failed to load correctly"
else:
print "ok"
The blank screen differs a 100% from the region or captured sreenshot, but both
test approaches fail unfortunately. What's wrong? Does it matter if I test
against a 10x10 blank png or a 1021x672 pixel?
Any help on this issue is highly appreciated. Thanks in advance for sharing
your experience.
regards
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Re: [Sikuli-driver] [Question #207285]: image comparison fails
Question #207285 on Sikuli changed: https://answers.launchpad.net/sikuli/+question/207285 Status: Open => Answered dinev proposed the following answer: I just done simple test on https://launchpad.net/sikuli with to see how recorded image is recognized. it works fine with exception that it is relatively slow on my 21" widescreen. But in general i think the approach of validating if web site is loaded is not correct. I would suggest following -- On the site homepage take 2 - 3 major elements that should be present. They may be ones that you will use afterwards anyway. Search for them -- Copy the whole content of the page by clicking in the middle and doing ctrl-a-c. The using the power of python check that some expected texts are there and some unexpected are not there(like "exception" and "error") I believe that above approach is more reliable since it will tolerate significant changes in website layout. Hope this helps You received this question notification because you are a member of Sikuli Drivers, which is an answer contact for Sikuli. ___ Mailing list: https://launchpad.net/~sikuli-driver Post to : sikuli-driver@lists.launchpad.net Unsubscribe : https://launchpad.net/~sikuli-driver More help : https://help.launchpad.net/ListHelp
Re: [Sikuli-driver] [Question #207285]: image comparison fails
Question #207285 on Sikuli changed: https://answers.launchpad.net/sikuli/+question/207285 RaiMan requested more information: does blank_page.png mean a totally white (or uni-color) area? If yes: this is problematic (but should work with latest version r930). Another thing: Look into screen region and test if blank_page.png (1021x672 pixel) exists. #screen region // screen size ipad screenRegion = Region(1,43,1020,804) Since the image is 1 pixel wider than the region, this will never be found. -- You received this question notification because you are a member of Sikuli Drivers, which is an answer contact for Sikuli. ___ Mailing list: https://launchpad.net/~sikuli-driver Post to : sikuli-driver@lists.launchpad.net Unsubscribe : https://launchpad.net/~sikuli-driver More help : https://help.launchpad.net/ListHelp
Re: [Sikuli-driver] [Question #207285]: image comparison fails
Question #207285 on Sikuli changed: https://answers.launchpad.net/sikuli/+question/207285 Status: Answered => Open Felix is still having a problem: Thanks for your replies, @dinev I thought about taking visual elements of the website and validate against them, but I'm looking for a more general approach so I can easily change the tested websites without touching the sikuli script. @raiman You're right, by blank page I mean a totally white (uni-color) are, e.g. you type about:blank in your browser's address bar and hit enter. I'm going to give r930 a try. What do you think? Which approach should I take? Which is one is more stable in terms of correct image comparision results? thanks in advance regards -- You received this question notification because you are a member of Sikuli Drivers, which is an answer contact for Sikuli. ___ Mailing list: https://launchpad.net/~sikuli-driver Post to : sikuli-driver@lists.launchpad.net Unsubscribe : https://launchpad.net/~sikuli-driver More help : https://help.launchpad.net/ListHelp
Re: [Sikuli-driver] [Question #207285]: image comparison fails
Question #207285 on Sikuli changed:
https://answers.launchpad.net/sikuli/+question/207285
Status: Open => Answered
RaiMan proposed the following answer:
--- but I'm looking for a more general approach so I can easily change the
tested websites without touching the sikuli script.
Generally this is a good idea, but my (and other people's) experiences tell me,
that this is usually combined with a huge scripting effort.
I think each Sikuli script will have some specifics about the images used
(different browsers, resolutions, systems, ... ) that lead to different
versions of the same script.
The only thing one should do: identify often used workflows and turn them in
classes/methods/functions, that can be reused.
--- Which is one is more stable in terms of correct image comparision results?
I agree (and usually use) dinev's approach: looking for some key visuals, that
should be there, to be sure, the workflow might proceed.
You might put this check in a function or functions, that accept some
parameters (list of images, expected regions, combination logic, ...)
examples:
checkAll(images, reg = SCREEN):
ret = True
for image in images:
if not reg.exists(image, 0):
ret = False
break
return ret
checkSome(images, reg = SCREEN):
ret = False
for image in images:
if reg.exists(image, 0):
ret = True
break
return ret
usage:
browser = App("your browser")
if not checkAll( ("image1.png", "image2.png", "image3.png" ),
browserApp.window() ):
print "makes no sense to go on"; exit(1)
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Re: [Sikuli-driver] [Question #207285]: image comparison fails
Question #207285 on Sikuli changed: https://answers.launchpad.net/sikuli/+question/207285 RaiMan posted a new comment: You could even use this approach, to check wether some white area is contained in the browser window. -- You received this question notification because you are a member of Sikuli Drivers, which is an answer contact for Sikuli. ___ Mailing list: https://launchpad.net/~sikuli-driver Post to : sikuli-driver@lists.launchpad.net Unsubscribe : https://launchpad.net/~sikuli-driver More help : https://help.launchpad.net/ListHelp
