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Questions tagged [image-comparison]

Methods, algorithms and techniques for the programmatic comparison of image data.

Methods, algorithms and techniques by which images can be programmatically compared, either to one another or to a database of extracted image features.

Meaningful image comparison will typically involve the extraction of some of features from the images in question, as metadata. Many techniques for feature extraction (and subsequent feature selection) come from the content-based image retrieval field.

Typical image-comparison schemes necessitate some manner of image processing as well.

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Can ImageMagick find a scaled down match of a large image?

I'm working on a project where we need to match original hi-resolution photos to their scaled down counterparts. For example the original may be 2000px x 2000px, and the scaled down version might be 500px x 500px. In researching how to do this I've…
STW
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Image won't replace while the program is running

I'm trying to make a screen sharing program, the program flows will be like this: capture screen slice to 9 compare new slice with old slice replace the different slice upload to web (with new slice) But I've got some problems with replacing the…
user3275641
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Finding subimage/template/object from mainImage/scene using opencv android

I want to find that does smalller image or subimage is part of larger image or not? and if it is part of it then want to know its coordinates. For doing that, i was using template matching method of opencv. It was working fine if the size of…
Mehul Thakkar
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simple image recognition with any api/library

Is it possible to do very basic image recognition to compare an image against a database of images(resource folder images or any web servers images if we have) and determine which image in the database is the best match? I don't need to do any…
user3098870
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How to find (and rank) similar images in a bigger set of images?

The problem I need to solve is the "matching" of a smaller set of images to a bigger one. More than that I want to rank their similarity. The first think that came to my head was to use sift features and found out the vl_sift function did the job…
nVolteX
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How to compare an image in a big database of image in opencv

I have this project in which i have a huge database of images divided into certain set. Now I have this one image which is not exactly the same, but is nearly the same as one or many images present in database. I need to predict that this image may…
Shubham Paramhans
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opencv capture image from webcam without post processing

I want to capture images from webcam without any post processing, that is NO auto focus , exposure correction , white balance and stuff. Well basically I want to capture continuous frames from webcam and make each frame compare with the previous one…
Prince Champappilly
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one image is a subset of another image

The scenario is, There are two images and we are required to say whether one image is a subset of another image. In other words, image A is present within or part of image B. We tried to use traditional bit by bit comparison, but it looks too time…
user1947468
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cvNorm isn't recognized as OpenCV function

I'm trying to compare to images in my phone's SDcard, so I wrote this piece of code. package com.example.test; import java.io.File; import android.os.Bundle; import android.app.Activity; import android.view.Menu; public class MainActivity extends…
Karthik Balakrishnan
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Apply diff image on the original image c#

suppose i have two image with same height and width. pic1.jpg & pic2.jpg. two image look pretty same with minimum difference. with the help of below routine we can get the difference between two images.this below routine is not my routine. public…
Thomas
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Image Comparison

What is the efficient way to compare two images in visual c..? Also in which format images has to be stored.(bmp, gif , jpeg.....)? Please provide some suggestions
user159007
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java.util.zip.CRC32 comparing image files

Is there any suggestion (piece of code) that helps me to understand the concept of how to compare two different image files whether they are same or not? Thanks in advance. EDIT: I mean, for example, I should check the CRC32 (that which I do not…
javatar
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Captured screen & conversion to Byte[] (image comparison methods)

I've red a few posts regarding image comparison, and I tried to save image captured from screen then store it in file system . I used conversion methods to convert captured image into byte[] for later use . Then when I want to compare it to second…
LoneXcoder
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units less then a pixel , Screen cupture searching partial image of screen within larger portion of screen

the whole thing is , that with CopyFromScreen() Method i was able to compare an image (previously captured) to an image that is the same as the captured one cause it actually captured from that particular screen . or more simply ,for example, an…
LoneXcoder
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Comparing images taken from Camera with already present images

I am new to this platform. I am developing application where I already have 100 images previously stored and want to compare image which I take from camera and see it that image matched with from existing 100 images. I searched a lot and found…
P.J
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