Okay, so, today I wanna talk about VGA scores. It’s something I’ve been messing around with lately, and I figured, why not share my little adventure?
First off, I kinda stumbled into this whole thing. I was reading up on how to check the image quality, and there it was, “Visual Grading Analysis,” or VGA for short. Sounded fancy, but really, it’s just a way to rate how good or bad an image looks.
So, I got my hands on a bunch of images. I wanted to see how this VGA thing works in action. I started by setting up a simple scoring system, from -2 to +2. It’s pretty straightforward – the higher the score, the better the image quality.
Here’s what I did:
- I grabbed a bunch of images, 45 to be exact, and labeled them as the “low image quality” group.
- Then I started looking at each image and giving it a score based on my little scale. It was kinda subjective, but I tried my best to be consistent. I looked at things like how clear the details were, the colors, the overall sharpness.
After going through all the images, I ended up with a range of scores. The lowest one was -1.73, and the highest was +0.67. It was interesting to see the variety, even within this group of not-so-great images.
I also read that there are some new computer adaptive tests for students in grades 3-8. It is to measure student growth and progress within the school year in reading and mathematics. I guess they are using similar methods to measure students’ performance. Sounds really familiar and not that difficult. The purpose of these tests is to discuss the strengths and limitations of the VGA method for image quality evaluation.
The whole experience got me thinking. This VGA method, it’s not just about slapping a number on an image. It’s about understanding what makes an image good or bad. And it’s not just for us tech geeks. Apparently, they use this kind of stuff in the medical field, with radiographers and all that. That’s just what I read, though.
Anyway, it was a fun little project. It’s always cool to dive into something new and see how it works. And who knows, maybe this VGA thing will come in handy someday. At the very least, I’ve got a better eye for image quality now, I guess.
