Just how to assess the similarity between two pictures?

Just how to assess the similarity between two pictures?

We have two team pictures for pet and dog. And every combined team have 2000 pictures for pet and dog correspondingly.

My objective is you will need to cluster the pictures by utilizing k-means.

Assume image1 is x , and image2 is y .Here we must assess the similarity between any two pictures. what’s the typical solution to determine between two pictures?

1 Response 1

Well, there a couple of therefore. lets go:

A – utilized in template matching:

Template Matching is linear and it is maybe not invariant to rotation (really not really robust to it) however it is pretty simple and easy robust to sound including the people in photography taken with low illumination.

It is simple to implement these making use of OpenCV Template Matching. Bellow there are mathematical equations determining a number of the similarity measures (adapted for comparing 2 equal sized pictures) utilized by cv2.matchTemplate:

1 – Sum Square Huge Difference

2 – Cross-Correlation

B – visual descriptors/feature detectors:

Numerous descriptors had been developed for pictures, their use that is main is register images/objects and look for them in other scenes. But, still they provide plenty of details about the image and were utilized in pupil detection (A joint cascaded framework for simultaneous eye detection and eye state estimation) as well as seem it utilized for lip reading (can’t direct one to it since I’m not certain it had been currently posted)

They detect points which can be regarded as features in pictures (appropriate points) the texture that is local of points as well as their geometrical place to each other may be used as features.

You are able to find out more if you want to keep research on Computer vision I recomend you check the whole course and maybe Rich Radke classes on Digital Image Processing and Computer Vision for Visual Effects, there is a lot of information there that can be useful for this hard working computer vision style you’re trying to take about it in Stanford’s Image Processing Classes (check handouts for classes 12,13 and 14)

1 – SIFT and SURF:

They are Scale Invariant practices, SURF is really a speed-up and version that is open of, SIFT is proprietary.


They are binary descriptors and so are really quick (primarily on processors with a pop_count instruction) and may be applied in a comparable solution to SIFT and SURF. Additionally, i have utilized BRIEF features as substitutes on template matching for Facial Landmark Detection with a high gain on rate with no loss on precision for both the IPD therefore the KIPD classifiers, so I don’t think there is harm in sharing) although I didn’t publish any of it yet (and this is just an incremental observation on the future articles.

3 – Histogram of Oriented Gradients (HoG):

This is certainly rotation invariant and it is utilized for face detection.

C – Convolutional Neural Systems:

I am aware that you don’t would you like to utilized NN’s but i do believe it really is reasonable to aim they’re REALLY POWERFULL, training a CNN with Triplet Loss may be actually good for learning a feature that is representative for clustering (and category).

Check always Wesley’s GitHub for an exemplory case college research paper writing service of it is power in facial recognition making use of Triplet Loss to get features after which SVM to classify.

Additionally, if Deep Learning to your problem is computational expense, it is simple to find pre-trained levels with dogs and cats around.

D – check up on previous work:

This dogs and cats battle happens to be taking place for the time that is long. you can examine solutions on Kaggle Competitions (Forum and Kernels), there were 2 on dogs and cats that one and therefore One

E – Famous Measures:

  • SSIM Structural similarity Index
  • L2 Norm ( Or distance that is euclidean
  • Mahalanobis Distance

F – check into other types of features

Dogs and cats may be an easy task to recognize by their ears and nose. size too but I’d kitties as huge as dogs.

so not really that safe to utilize size.

You could decide to try segmenting the pictures into animals and back ground and then make an effort to do area home analisys.

This book here: Feature Extraction & Image Processing for Computer Vision from Mark S. Nixon have much information on this kind of procedure if you have the time

You can look at Fisher Discriminant review and PCA to produce a mapping and also the evaluate with Mahalanobis Distance or L2 Norm