Find visually similar images by image upload with PHP and MYSQL

Status: Closed
Prize: $100
Entries Received: 6
Winner: Serge755

Winner

Contest Brief

Hello everyone!
I need a code that will allow searching image database by uploading an image.
Attached is a zipped folder of about 2,000 stone images that you can use for testing.
I'm thinking about this approach:
1. Hash the image data for each file and store it in the database.
2. Once the image is uploaded (for searching), the hash will be created.
3. Run MYSQL query to find the closest matches.
If you have a different approach in mind, please feel free to try.

Please note that some of the images will have a partially white background, we need to disregard (ignore) that. Possibly crop the white background out.
The images provided are all square, the images that will be uploaded for search may have different aspect ratios.
Also, the SQL query for searching similar images is very important as we may have over 100,000 images in the database at some point.

I'm hoping to have it done with no external libraries (GD and ImageMagic is fine)
I also need to have a variable accuracy setting so I can adjust for best results.

I don't really need any UI at this point, as long as we can test the code.

Once at least one working solution will be submitted, I will set this contest as Guaranteed.
Good luck, please feel free to message me with any questions.

*********UPDATE************
I have attached a zipped folder with a few images that can be used for performing the test search.
Please note that we would need to disregard the aspect raion of the images.
What I'm really after is the matches with the similar color and texture pattern.

Recommended Skills

MySQL
PHP

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Employer Feedback

“Sergey have done a great work on the project. Very happy with the resullts.”

ashevillemnt, United States.

Top entries from this contest

Serge755 Ukraine

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cestis Poland

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TanjimRahatBD Bangladesh

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Public Clarification Board

Contest Holder
- 3 years ago
Congratulations Sergey!
Thanks, everyone for your effort, I really appreciate it!
While there is still room for improvement, Sergey's solution produces the most accurate results!
- 3 years ago
cram3632
- 3 years ago
can I use GD or ImageMagic
- 3 years ago
1. Contest Holder
  - 3 years ago
  sure, either one would be fine.
  - 3 years ago
daniyalhussain96
- 3 years ago
Can we use md5 algorithm for hashing?
- 3 years ago
1. Contest Holder
  - 3 years ago
  Sure, as long as we can store it in the database and search it.
  - 3 years ago
2. daniyalhussain96
  - 3 years ago
  Okay, will upload it and let you know.
  - 3 years ago
ceinj
- 3 years ago
Do these images represent different angles and sizes?
- 3 years ago
1. Contest Holder
  - 3 years ago
  These images are center crops from bigger images. We can disregard angles and sizes, what is important is that we match texture and color.
  - 3 years ago