{"id":32057,"date":"2025-01-14T10:33:14","date_gmt":"2025-01-14T09:33:14","guid":{"rendered":"https:\/\/charlyhayoz.ch\/?p=32057"},"modified":"2025-01-16T11:58:12","modified_gmt":"2025-01-16T10:58:12","slug":"how-to-detect-images-modified-or-generated-by-lia","status":"publish","type":"post","link":"https:\/\/charlyhayoz.ch\/en\/articles\/comment-detecter-des-images-modifiees-ou-generees-par-lia\/","title":{"rendered":"How to detect altered or AI-generated images"},"content":{"rendered":"<p>Most of us like to make and see beautiful images. But it's hard to \"make\" a <strong>nice picture <\/strong>all at once without modification\".\u00a0<strong>photo-shop<\/strong>\" . Except with artificial intelligence.<\/p>\n\n\n\n<p>But how do you spot these changes? With 2 deep learning algorithms, it's possible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-psccnet-reperer-les-modifications-sur-une-image\">PSCCNET: Identify modifications to an image<\/h2>\n\n\n\n<p>This algorithm (<a href=\"https:\/\/arxiv.org\/abs\/2103.10596\">PSCC-Net: Progressive Spatio-Channel Correlation Network for Image Manipulation Detection and Localization<\/a>) is ideal for detecting modifications to images. It can detect copy-paste, add, modify and delete. <\/p>\n\n\n\n<p>Let's take an example:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"516\" src=\"https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog-1024x516.png\" alt=\"Left: Unmodified image - Right: Modified image with background change\" class=\"wp-image-32066\" srcset=\"https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog-1024x516.png 1024w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog-300x151.png 300w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog-768x387.png 768w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog-1536x774.png 1536w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog-18x9.png 18w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog.png 1986w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Left: Unmodified image - Right: Modified image with background change<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"516\" data-src=\"https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog_reaction-1024x516.png\" alt=\"Left: No reaction, little or no change - Right: Strong reaction, sign of obvious changes\" class=\"wp-image-32067 lazyload\" data-srcset=\"https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog_reaction-1024x516.png 1024w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog_reaction-300x151.png 300w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog_reaction-768x387.png 768w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog_reaction-1536x774.png 1536w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog_reaction-18x9.png 18w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/dog_reaction.png 1986w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/516;\" \/><figcaption class=\"wp-element-caption\">Left: No reaction = little or no change - Right: Strong reaction = clear change<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-trufor-reperer-les-images-generees-par-l-intelligence-artificielle-ia\">TRUFOR: Spotting images generated by artificial intelligence (AI)<\/h2>\n\n\n\n<p>This algorithm (<a href=\"https:\/\/arxiv.org\/abs\/2212.10957\">TruFor: Leveraging all-round clues for trustworthy image forgery detection and localization<\/a>) to detect modifications, and is particularly effective in detecting images generated by artificial intelligence.<\/p>\n\n\n\n<p>Let's take an example:<br><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"516\" data-src=\"https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia-1024x516.png\" alt=\"Left: An unmodified image with the cat&#039;s head, pasted from another image - Right: An AI-generated image\" class=\"wp-image-32068 lazyload\" data-srcset=\"https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia-1024x516.png 1024w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia-300x151.png 300w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia-768x387.png 768w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia-1536x774.png 1536w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia-18x9.png 18w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia.png 1986w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/516;\" \/><figcaption class=\"wp-element-caption\">Left: An unmodified image, except for the cat's head, pasted from another image - Right: An AI-generated image<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"516\" data-src=\"https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia_reaction-1024x516.png\" alt=\"Left - Little reaction except on the cat&#039;s head, proving a modification - Right, a fairly global reaction proving that the image was generated by AI\" class=\"wp-image-32069 lazyload\" data-srcset=\"https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia_reaction-1024x516.png 1024w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia_reaction-300x151.png 300w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia_reaction-768x387.png 768w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia_reaction-1536x774.png 1536w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia_reaction-18x9.png 18w, https:\/\/charlyhayoz.ch\/wp-content\/uploads\/2025\/01\/ia_reaction.png 1986w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/516;\" \/><figcaption class=\"wp-element-caption\">Left - Little reaction apart from on the cat's head, proving a modification - Right, a fairly global reaction proving that the image has been generated by AI<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusion-pouvons-nous-vraiment-detecter-les-images-modifiees-ou-generees-par-intelligence-artificielle\">Conclusion: Can we really detect images that have been modified or generated by artificial intelligence?<\/h2>\n\n\n\n<p>Of course, these algorithms are not perfect and there will be <strong>always <\/strong>false positives and true negatives. On the other hand, it's interesting to see that, overall, these algorithms manage to detect<strong> very well<\/strong> image modifications.<\/p>","protected":false},"excerpt":{"rendered":"<p>Nous aimons pour la plupart faire et voir de belles images. Mais difficile de \u00ab\u00a0faire\u00a0\u00bb une belle image d&rsquo;un coup sans modifications \u00ab\u00a0photo-shop\u00ab\u00a0. Sauf avec l&rsquo;intelligence artificielle. Mais comment rep\u00e9rer ces modifications ? Avec 2 algorithmes de deep learning, c&rsquo;est possible. PSCCNET : Rep\u00e9rer les modifications sur une image Cet algorithme (PSCC-Net: Progressive Spatio-Channel Correlation [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":32072,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55],"tags":[],"class_list":["post-32057","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.2 (Yoast SEO v23.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comment d\u00e9tecter des images modifi\u00e9es ou g\u00e9n\u00e9r\u00e9es par l&#039;IA<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez comment d\u00e9tecter les images modifi\u00e9es ou g\u00e9n\u00e9r\u00e9es par l&#039;IA avec des algorithmes de DeepLearning comme PSCCNET et TruFor\" \/>\n<meta name=\"robots\" content=\"index, follow, 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