dHash | Difference Hash a quick algorithm | Hashing library

by Tom64b PHP Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(9)Vulnerabilities Install Support

kandi X-RAY | dHash Summary

dHash is a PHP library typically used in Security, Hashing applications. dHash has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

This code was based on: - -

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Security

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Support

dHash has a low active ecosystem.

It has 36 star(s) with 7 fork(s). There are 3 watchers for this library.

It had no major release in the last 6 months.

There are 3 open issues and 1 have been closed. On average issues are closed in 1 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of dHash is current.

Quality

dHash has 0 bugs and 0 code smells.

Security

dHash has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

dHash code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

dHash is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

dHash releases are not available. You will need to build from source code and install.

Installation instructions, examples and code snippets are available.

It has 46 lines of code, 2 functions and 1 files.

It has low code complexity. Code complexity directly impacts maintainability of the code.

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dHash Key Features

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dHash Examples and Code Snippets

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Community Discussions

Trending Discussions on dHash

Slow performance in hashing images in Python

javascript indexOf class containing element

Understanding python syntax - variable followed by parenthesis

Numpy error trying to use difference hashing with the ImageHash library

Difference hashing and understanding what these lines of code are doing?

How to calculate Hemming Distance in CosmosDB?

printing array from unified memory on cuda device doesn`t work

I have been using Node JS and NPM for several years with no issues. Suddenly I am receiving an error with any NPM command

Find duplicate images in fastest way

QUESTION

Slow performance in hashing images in Python

Asked 2022-Jan-14 at 16:25

I have a function to create image difference hash and stored in a list in Python:

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ANSWER

Answered 2022-Jan-14 at 13:40

Multiprocessing would ideal for this as the hashing is CPU intensive.

Here's what I suggest:

Source https://stackoverflow.com/questions/70708949

QUESTION

javascript indexOf class containing element

Asked 2021-Nov-06 at 22:50

I have an array of elements of the same class, how can I search indexOf with only one element from the class

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ANSWER

Answered 2021-Nov-06 at 22:50

The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present. - MDN

You are looking for the element whose value if 0x001003 but listohashs is an array of objects. So you are comparing the object with 0x001003 which won't be equal so it will return -1.

You can use findindex here, You have to find the index of the object whose Dlable property value is 0x001003

Source https://stackoverflow.com/questions/69868468

QUESTION

Understanding python syntax - variable followed by parenthesis

Asked 2021-Jun-04 at 08:45

I saw this syntax in the python implementation of bitcoin over here.

https://github.com/samrushing/caesure/blob/master/caesure/bitcoin.py

I have never seen this syntax before, can someone explain it to me or show me somewhere in the documentation where I can understand it?

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ANSWER

Answered 2021-Jun-04 at 08:38

In Python you can assign functions to variables.

fout.write is a function, so in this example, D is assigned to that function.

D = fout.write

In this line D ('hash: %s\n' % (hexify (dhash (self.render())),)), you are calling the function D, that is, fout.write. It would be the same as:

fout.write('hash: %s\n' % (hexify (dhash (self.render())),))

Source https://stackoverflow.com/questions/67834061

QUESTION

Numpy error trying to use difference hashing with the ImageHash library

Asked 2021-Apr-27 at 04:42

I am trying to perform difference hashing with the python ImageHash library and keep getting a numpy error.

The error:

File "/Users/testuser/Desktop/test_folder/test_env/lib/python3.8/site-packages/imagehash.py", line 252, in dhash image = image.convert("L").resize((hash_size + 1, hash_size), Image.ANTIALIAS) AttributeError: 'numpy.ndarray' object has no attribute 'convert'

The code:

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ANSWER

Answered 2021-Apr-27 at 04:42

as it is mentioned in imagehash library's document, @image must be a PIL instance.. so you cant set numpy array as input of the dshash function.if you want do some preprocess with opencv, you should convert it into PIL array before setting it into dhash, like this :

Source https://stackoverflow.com/questions/67275803

QUESTION

Difference hashing and understanding what these lines of code are doing?

Asked 2020-Nov-22 at 18:36

I am new to Python and am writing an application to identify matching images. I am using the dHash algorithm to compare the hashes of images. I have seen in a tutorial the following lines of code:

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ANSWER

Answered 2020-Nov-22 at 18:36

To break it down, the first line pixel_difference = image_resized[0:, 1:] > image_resized[0:, :-1] is basically doing the following:

Source https://stackoverflow.com/questions/64957283

QUESTION

How to calculate Hemming Distance in CosmosDB?

Asked 2020-Oct-26 at 16:55

Each item in my collection has a 64-bit number, which represents dhash of the image. I want to run a query by this field, which will return all items, that have Hamming Distance more or less than some param.

In MySQL I would use BIT_COUNT function. Is there any built-in analog of it in CosmosDB? If no, then how my HAMMING_DISTANCE UDF should look like since JS doesn't support bitwise operations on 64-bit numbers?

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ANSWER

Answered 2020-Oct-26 at 16:55

To solve this I took code from long.js and ImageHash for using in CosmosDB UDF. All cudos to their authors.

See gist it here https://gist.github.com/okolobaxa/55cc08a0d67bc60505bfe3ab4f8bc33c

Usage:

Source https://stackoverflow.com/questions/64416618

QUESTION

printing array from unified memory on cuda device doesn`t work

Asked 2020-Oct-24 at 01:22

I try to create some hashes on a cuda device and printing them on the host. But at the printf on the host i am getting a read error at position 0x000000000100002F

The relevant lines look like this:

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ANSWER

Answered 2020-Oct-24 at 01:22

The memory allocation you are using to hold the hashes is incorrect. To have an array of pointers to the memory for each hash, you would require memory allocated both for the array of pointers, and for the hashes themselves, so something like:

Source https://stackoverflow.com/questions/64508119

QUESTION

I have been using Node JS and NPM for several years with no issues. Suddenly I am receiving an error with any NPM command

Asked 2020-Sep-09 at 17:59

I am not sure at all what changed. There were a couple of app upgrades that I ran which might or might not have caused the issue. I believe this may be an issue with the path but I am really not sure. That is the reason I am posting here. Thanks for your help in advance.

This is what I receive when I attempt to run any NPM command:

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ANSWER

Answered 2020-Sep-09 at 17:59

I was able to fix this problem First: I uninstalled Node JS from my machine (I am not sure this was needed but I did it)

Second: I copied all of the directories from the (Node JS install)\node_modules\npm\node_modules directory to the c:\Users(user name)\AppData\Roaming\npm\node_modules\npm\node_modules directory

Now it appears that all the npm stuff works. When I run the two commands to get the current versions it returns the correct information.

D:>node -v

v12.18.3

D:>npm -v

6.14.7

I am not sure how things were confused but it appears that at some point in time over the last couple of years that the AppData location had stopped being updated. When I did an update the path was set back to the AppData and that data was very old. By copying over the node_modules for the new install to the AppData location it appears at this point that everything was updated.

I hope this helps someone else in the future.

Source https://stackoverflow.com/questions/63796829

QUESTION

Find duplicate images in fastest way

Asked 2020-Jul-31 at 17:12

I have 2 image folder containing 10k and 35k images. Each image is approximately the size of (2k,2k).
I want to remove the images which are exact duplicates.
The variation in different images are just a change in some pixels.
I have tried DHashing, PHashing, AHashing but as they are lossy image hashing technique so they are giving the same hash for non-duplicate images too.
I also tried writing a code in python, which will just subtract images and the combination in which the resultant array is not zero everywhere gives those image pair to be duplicate of each other. Buth the time for a single combination is 0.29 seconds and for total 350 million combinations is really huge.
Is there a way to do it in a faster way without flagging non-duplicate images also. I am open to doing it in any language(C,C++), any approach(distributed computing, multithreading) which can solve my problem accurately.
Apologies if I added some of the irrelevant approaches as I am not from computer science background.
Below is the code I used for python approach -

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ANSWER

Answered 2020-Jul-31 at 16:45

You should find the answer on how to delete duplicate files (not only images). Then you can use, for example, fdupes or find some alternative SW: https://alternativeto.net/software/fdupes/

Source https://stackoverflow.com/questions/63195790

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