This is hard to answer in general, although general aspects like contrast and resolution are important of course. Maybe you can provide some background regarding your know how and technology you're going to use.
I tried with downsample and up sample image with opencv using INTER_AREA then compare them with SSMI. After that I pick the threshold to determine which is bad and which is good, but it still not work well.
I struggle when determine the threshold, some blur image have higher score than high quality image, but other blur image has lower score than high quality image.
So I wonder where i'm wrong or have some better approaches to resolve this.
I struggle when determine the threshold, some blur image have higher score than high quality image, but other blur image has lower score than high quality image.
So I wonder where i'm wrong or have some better approaches to resolve this.