Check if sub image exists in main image with PHP?

Question

Using PHP, how can I check whether an image exists within another?

Example:

How can I check whether subimage.jpg exists within mainimage.jpg, using PHP?

subimage.jpg
mainimage.jpg

This looks more like a joke, since actually the subimage doesn't even appear in the mainimage. Now if you mean an object (=>bottle) appears in the mainimage, that's a completely different story. — Christian, May 13 '23 at 18:40

score 1 · Answer 1 · answered Apr 25 '17 at 14:03

1

The Imagick class , Check this link

Using Imagick::compareImages() to Compare images and display the reconstructed image .

<?php

$image1 = new imagick("image1.png");
$image2 = new imagick("image2.png");

$result = $image1->compareImages($image2, Imagick::METRIC_MEANSQUAREERROR);
$result[0]->setImageFormat("png");

header("Content-Type: image/png");
echo $result[0];

?>

answered Apr 25 '17 at 14:03

Med Dhiia

64
4

This makes **no** allowance for shifts, rotations, or most importantly **differences in scale** so it has no chance of working with the supplied images. – Mark Setchell Apr 25 '17 at 14:13
@Mark Setchell Be aware OP edited his question heavily after I flagged it as a duplicate – mayersdesign Apr 27 '17 at 13:41

score -1 · Answer 2 · answered Apr 25 '17 at 14:01

-1

Try this

$img1 = md5(file_get_contents($img1));
$img2 = md5(file_get_contents($img2));

And compare both

answered Apr 25 '17 at 14:01

Ahmed Ginani

6,522
2
15
33

1

That cannot work! It merely checks whether two images are identical, bit for bit, not whether one image is a sub image of another. – Mark Setchell Apr 25 '17 at 14:11
Confirmed. OP edited his question heavily after I flagged it as a duplicate. – mayersdesign Apr 25 '17 at 18:50
@mayersdesign please remove flagged. because i think not get a right answer of this same. i have edited and this is totally unique. – Manish Patolia Apr 27 '17 at 13:21
@Manish Patolia I removed the flag some days ago, where are you seeing it? – mayersdesign Apr 27 '17 at 13:41
@mayersdesign i can see "This question may already have an answer here:" and question url. you can see this? – Manish Patolia Apr 27 '17 at 13:42
No i cannot see it – mayersdesign Apr 27 '17 at 13:48
PNG is compressed, meaning that even a slightly different pixel will cause a completely different file, on top of that md5 is not meant for comparing similarities. This code will **never** work. – Christian May 13 '23 at 18:35

Check if sub image exists in main image with PHP?

2 Answers2