Compare two images

Hai Java Guys,
How to compare two images using java.If any thing different at any place ,we have to give details of that pixel.It is GIS project.If anybody know solution for this plz let me know.Thank you in asdvance.
Basha

If the two images are represented as java.awt.Images and have the same scale you can use the java.awt.image.PixelGrabber to obtain an array of the pixel values for each image. Compare the values of these two arrays, and you know where in the images you have differing pixels.

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How do we compare two images in labview?

I have created a back end code which is comparing two images using LABVIEW.i have used a comparator and put a tolerance factor which will help me filter out almost same images.the problem i am facing is that on subtraction of the given two images i am getting a completely random output with noise surrounding the parts of the image which are being compared.Also the tolerance percentage i have given has not been working very effectively.Kindly let me know if there is an easier solution to my task or what needs to be done
Thank you

Can you post your code?
Randall Pursley

How to compare two images through golden Template analysis?

hi,
How to compare two images through golden Template analysis?
Regards
Dibya

Hi Dibya,
you can skip the pattern matching part if it's not interesting to you. Only look at the "GoldenTemplate"-part.
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Comparing Two Images

Hi All,
I need to compare two images to detect if they are identical. This algorith
needs to work for gray scale and colour.
What I have done for gray scale is use a compare function (with clear if =)
and then perform a histrogram function on the resulting image. I then check
the distrubution of the 1 to 255 elements to see if they have any pixels.
If they do I know the images are not the same.
With a colour image I perform the compare function on each colour. Add the
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Hi Brent,
thanks for your input. I implemented your method and it works fine.
However I did some timing test and came up with the following observations:
Method 1 Method 2
8bit Images Fastest
16bit Images Fastest
Float Images Fastest
Complex Image --- Not Supported ---
RGB Image Equal Equal
HSL Very Slow Not Supported
I find it interesting that the method I suggested typically executes quicker
then the one you suggested. Additionally my method supports HSL (this might
not be important - I've never had to use HSL.
I have include these finding for your benefit, and anyone else that might
have an interest in this t
opic.
I have included my source code in case anyone would like to look at it. If
anyone has any thoughts or alterations, I would be interested in hearing
them.
Thanks
Denis
[Attachment Test.llb, see below]
Attachments:
Test.llb ‏184 KB

How to compare two images

hey frens..i m building a motion detector in java....the problem is this, i have two bufferedimages from webcam...these are consecutive images taken from webcam...i need to compare these two images to check for any changes....i have no idea how to do this...i m trying getRGB() method for this purpose but i think i m not correctly applying it....
so if anyone have any idea how to do this..plzz reply...

Take the RGB value from the second image and subtract it from the first.
If the values are the same, the result will be 0 (or black). If the values are different the result will be 0 < x < 255 and the result will be closer to white.
This works really well for black and white images.

How to compare two images and display the difference on Front Panel

HI..
I have attached two images.
I want to compare these two images and subtract the differenc from these two images and display the difference(the mouse) on the front panel
Anyone can help me?
Really thanks
Attachments:
IMG_2117.JPG ‏1677 KB
IMG_2118.JPG ‏1650 KB

The missing thing. You have to keep in mind that what you see is not the same as the camera sees.
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In order to find the mouse as only difference you have to manage that every other pixel value stays the same, e.g. with a proper lightening.
At the other hand you can combine different filters or alogorithms to get the object, e.g. if the object is darker or brighter then everything else in the image you could use a threshold and then use morphologic operations to get the objects size and position.
Christian

Comparing two images with Imaging Lingo

Hi everybody!
Here's the deal: I have two grayscale images and I want to
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Right? Wrong!
When Director subtracts one color from the other and the
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nonlinear.openspark.com
to isolate the pixels that are nearly white.

100% view while comparing two images

I view the original and a working copy on my display and enlarge both with the "Z" key to 100%. Unfortunately they are not in synch meaning I do not see the same crop from each picture. How can I lock both images the way I can see the same area of both when I am moving one of them around?

Help partially, thanks, but..
WHen i have both images in 10%% and press/hold shift key then I can move around synched, that's fine, however, when I have both images on display and press "Z" to view at 100% the images are not in synch - that's the important part.

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What i want to do is to compare two images. I have a base color image that represents the desired colors and tones. I have another image to be compared to the base image. What i want to do is to compare this two images to know how close they are regarding contents of color and tones. In other words, i want to know how close is image 2 to image 1 (base sample)....
I would like to know how to get the content of certain colors in an image and then compare this values with the same values from another image.
For example..i have two sheets of paper that contain various mixed colors...i want to know the amount of green, red an blue in each image and then comapre this values.
What i want to do is to compare difer
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VBAI allows you to work with grayscale images only. You can acquire an image, use the vision assistant to convert it grayscale by extracting the luminance plane (or any of the other color planes) and then analyze the resulting grayscale image. To do what you are talking about, though, it would really be better to get Vision for labview. You could then take color images, compare color plains, use statistical functions to determine average color values, and so on.

Images XOR, AND, etc... logical operators to compare two distinct objects

is there a way of comper two images without comparing all it bytes...
the problem: actually I�m parsing the values of the bytes of the two images and then comparing it...
idea: if I have the two byte arrays containing the image info.. may I use a logical operator to compare these objects ??

FelipeGaucho again,
Did you come up with an optimized method for logical operators? I actually want to perform the boolean operations to turn most pixels of an image to zero, then compress that (as in your post 'String compressor II'). Are these two posts related for you as well? They are separated by several months.
abnormal,
I'm assuming that Java's classes would be optimized, but if my code will execute at the same speed as theirs, then I guess I can stop searching for optimized (or already provided) classes. Do you know if Java's provided classes run faster than classes we create? I'm going to test the provided System.arraycopy against my own while waiting for a reply.

I want to convert two image files into strings and than to compare them. This is easy, but how to mention where the difference exist?

I have two image file in bmp file format. How to convert them into string and to check if they are differnt or same. If different how to mention or find that where the difference exists. This idea have to be extented with video application as well.

Hi,
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1) Make a subtraction of the two images, the resulting image will be the difference of them
2 ) Use IMAQ LogDiff function (operators palette)
3) Calculate the histogram of both image and compare the histogram reports
Good luck,
Alberto

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Hi,
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But there is one flaw in this approach, if user explicitly changed the time and captured the pictures it won�t work properly.
- satdmail -

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It is extremely frustrating to have to bounce back and forth between collections, remembering each image one by one and selecting it in the "recovered" collection. (The image names are not preserved in the "recovered" collection -- I have to go by what the image looks like.)
LightRoom allows me to compare photos in the compare view. I want to compare collections in two grid views.

CaptureTheLight,
you have ran into a situation when you have to compare two sets of images and now you're wondering how come Lightroom doesn't have such "obviously necessary" functionality? But you have to admit it, this is not such a common situation in a photographer's workflow recovers broken files and tries to compare them against themselves. I think it's a pretty specific feature you need. Still, Lightroom has enough powerful tools for editing and sorting images.
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Combine quality of two images?

Hi
I know how to combine or merge tow images in Photoshop CS5
But if I use images from the Internet, mostly by seaching in Google picture search.
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Lars jØrgensen

You're talking about finding images of the very same subject material, shot from the exact same place, and combining them to make an image better than any one of the images you found? I'm not sure I'm following you completely here.
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You can sample colors by making the INFO panel visible (Window - Info) and hovering the cursor over your images.
-Noel

Compare two jpeg's taken from ip camera

Hi folks,
I've got an IP camera, and I need to take two photos and compare them, and then my program must return if there's something different on the image. Taking the photos is not a problem, using an activex control with the camera library I can use a function that writes a jpeg image to the disk. The real problem is to compare those images. I tried to subtract them, but since the sensor is a CMOS, there's a lot of noise, and even if i take two photos without moving anything, when i subtract the pictures it is not empty (black).Then I tried using Vision Assistent or the Golden Template, but I could not use them, because of two problems:
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Regards,
Vitor
Solved!
Go to Solution.

I forgot to post some of the images i need to compare:
Image 1 Image 2 Image 1 - Image 2
When i compare image 1 and image 2, my VI must return nothing, but if the cup isn't there on image 2, it must return a warning.
What i did was to deploy the images in 2D arrays, subtract them, and if the result was different from 0 the VI returns the warning, but even when the images are "equal", the subtraction is different from zero.
Any ideas?

Compare two images

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