SikuliX

Unable to compare Expected SS to Actual Output

Asked by Justin Veerman

I am simply trying to compare my Expected output screenshot to the Actual output screenshot after running a test.

The following is what I am trying to use:

if (screen.exists(image6.similar(95), timeout) != null) {
   System.out.println("Screenshot matches baseline.");
  }
   else {
    System.out.println("Screenshot does not match baseline.");
  }

I thought it would see if screen exists, if so, then check to see if image6(which is my Expected output) is on the screen(with 95% similarity, being 95% same pixels).

I am unable to get the results I require , such as comparing a screenshot to a screenshot when I know both are exactly the same(I even put 95% similar).

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RaiMan
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Justin Veerman (veerman) said : 		#1

Also, I just want to make note of how difficult it was to find some example code. Comparing a screenshot to expected output, I would think, is a common problem for testing automation. There was really only two Sikuli tutorials on Youtube and even they did not address the comparisons.

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Eugene Maslov (emaslov1) said : 		#2

95 is wrong.

found=reg.exists(Pattern("myimage.png").similar(0.95),1)
if found:
    print "match"
else:
    print "no match"

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Justin Veerman (veerman) said : 		#3

Hi Eugene,

Thanks for the response, however I am still a bit confused. What is this code doing? Why is 95 wrong if you included it in your response? Is it right that found is a Match type? You also put (if found), isn't the if supposed to be conditional on it being true?

I tried my best to convert your answer to Java:

 Match found = screen.exists(image6.similar((float) 0.95),1);
  if (found != null) {
   System.out.println("Match");
  } else {
    System.out.println("No Match");
   }

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RaiMan (raimund-hocke) said : 		#4

not knowing, what type image6 has, this is needed to add a wanted similarity score (as seen in Eugene's comment):

Match found = screen.exists(new Pattern(image6).similar(0.95f),1);

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Justin Veerman (veerman) said : 		#5

This did solve my issue, but I am curious why the 1 was needed. I don't really know what the 1 is referring to.

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RaiMan (raimund-hocke) said : 		#6

@Justin
already had a look into the docs?
http://sikulix-2014.readthedocs.org/en/latest/index.html

or the javadocs:
http://nightly.sikuli.de/docs/index.html

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Justin Veerman (veerman) said : 		#7

I did look at the docs but I couldn't figure out(before) how to write the commands in Java. I don't know where to find the format for Match within the docs, I am sure there they are but I couldn't find it.

eg Match found = screen.exists(new Pattern(image6).similar(0.95),1);

I usually like seeing an example of code and then applying it to my project, but I found that a bit difficult with the docs.

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Eugene Maslov (emaslov1) said : 		#8

Justin, the magic help tool is Google. If a problem is solvable, Sikuli examples are usually present in the web, e.g. "sikuli java exists image not found", or a similar phrase, returns the examples, e.g. https://answers.launchpad.net/sikuli/+question/146397 .

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Justin Veerman (veerman) said : 		#9

I understand. I just meant that having a start to finish example(a simple use-case) showing how Java/Selenium/Sikuli integrate with each other would be helpful. I tried to piece together examples from different places.

Thanks for your help.

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Best RaiMan (raimund-hocke) said : 		#10

@Justin
Ok, understood.
So if you are more the type "programming-by-example", then the docs of Sikuli currently do not have much for Java. Here I fully agree with Eugene. I will surely enhance that over the next months.

... but on the other hand: a Java programmer must be able to read javadocs:
http://nightly.sikuli.de/docs/index.html

so since
screen.exists(new Pattern(image6).similar(0.95),1);

returns a Match object, it has to be
Match myMatch = screen.exists(new Pattern(image6).similar(0.95),1);

to store the Match object for later use.

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Justin Veerman (veerman) said : 		#11

Thanks RaiMan, that solved my question.