How to do image comparison through java

gfight · Jun '18

I need to do image comparison for iOS and Android both. Any way to do it?

bennid · Jun '18

This is a pretty generic ask… have you done any research on this? Appium can take screenshots of both Android and IOS, so that should be enough to get you started.

wreed · Jun '18

We use imagemagick. My automation is in Ruby, but there is support for Java:

http://www.imagemagick.org/script/index.php26

gfight · Jun '18

I have done this but write now I am just getting result in string… Images are not same or images are same…need screenshot with difference highlighted In it

gfight · Jun '18

Thanks…lemme look into it

mykola-mokhnach · Jun '18

github.com36

appium/appium/blob/master/docs/en/writing-running-appium/image-comparison.md

# Image Comparison Features

This article describes the set of image comparison features available in Appium. These features are available in all drivers and require OpenCV 3 native libs. Also, each feature is able to visualize the comparison result, so you can always track what is going on under the hood to select optimal matching parameters to achieve the best comparison results.


## Prerequisites

- OpenCV 3+ native libraries
- [opencv4nodejs](https://github.com/justadudewhohacks/opencv4nodejs) npm module: `npm i -g opencv4nodejs`. By default the preinstall script of this module also downloads and makes all the required OpenCV libs from source, but this requires developer tools to be available on the host system.
- Appium Server 1.8.0+


## Purpose

Image comparison might be handy for many automation tasks. For example:
- It is necessary to figure out whether the given picture example is present on the screen
- It is necessary to calculate coordinates of some predefined on-screen object
- It is necessary to verify whether the current on-screen object state is similar to the expected state

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gfight · Jun '18

Thanks…done it successfully

MrZigaS · Jun '18

Maybe you should try:

gfight · Jun '18

is it free or paid…?

Suswari_Reddy · Dec '18

Hi,
I have issues using appium/appium/blob/master/docs/en/writing-running-appium/image-comparison.md
Were you successful comparing images. Can you please assist me.
The error I see is below:
org.openqa.selenium.WebDriverException: An unknown server-side error occurred while processing the command. Original error: opencv4nodejs module is required to use OpenCV features. Please install it first (npm i -g opencv4nodejs) and restart Appium. Read https://github.com/justadudewhohacks/opencv4nodejs#how-to-install2 for more details on this topic.

How to do image comparison through java

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