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On Internet, I can see many videos/movies claim to have FHD (1920x1080) resolution, but on watching they seem to be shot in lower resolution and resized/scaled up using encoder or transcoding tool to 1080p resolution.

My question: is there any tool to detect such scaling up? If possible, I prefer ffmpeg tool, or knowledge base of such detection.

Thanks,

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May i rephrase your question as

How natural does an image look?

If so, you are finding Naturalness Image Quality Evaluator (NIQE). Plz take a look of Naturalness Image Quality Evaluator (NIQE) no-reference image quality score. Then you may find some information from Laboratory for Image & Video Engineering and then you will get some tools like

Good Luck!

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