How to detect if video had been sized up (Scaled up) in resolution?

Question

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,

Answer 1

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

• scikit-video
• Video Quality Indicators

Good Luck!