Just to confirm, the left image is the blurred aliasing and the right image is antialiasing, correct? I got a little confused by the order in the title being "Antialiasing vs Blurred Aliasing" because it almost makes it look like the other way around
Staffi-geng
Yep, in the left image we’ve sampled the signal and then blurred the result, and in the right image we’ve properly pre-filtered the signal before sampling!
nickjiang2378
I'm unclear what is meant by low vs. high frequencies. The professor mentioned at some point that frequency is essentially resolution and that it's a high frequency to move one color to the next along an edge. Are we imagining the "signal" here to be the change in colors from pixel to pixel? Is there a clean definition for sampling frequency in the context of these images?
RishSharma7
I assume that we should be using the Pre-Filtered method for all our purposes in this class. But I wonder, are there any scenarios either for artistic or other purposes that somebody would intentionally use "sample then filter"?
llejj
@RishSharma7 I believe there are such scenarios, such as to imitate a watercolor effect.
Just to confirm, the left image is the blurred aliasing and the right image is antialiasing, correct? I got a little confused by the order in the title being "Antialiasing vs Blurred Aliasing" because it almost makes it look like the other way around
Yep, in the left image we’ve sampled the signal and then blurred the result, and in the right image we’ve properly pre-filtered the signal before sampling!
I'm unclear what is meant by low vs. high frequencies. The professor mentioned at some point that frequency is essentially resolution and that it's a high frequency to move one color to the next along an edge. Are we imagining the "signal" here to be the change in colors from pixel to pixel? Is there a clean definition for sampling frequency in the context of these images?
I assume that we should be using the Pre-Filtered method for all our purposes in this class. But I wonder, are there any scenarios either for artistic or other purposes that somebody would intentionally use "sample then filter"?
@RishSharma7 I believe there are such scenarios, such as to imitate a watercolor effect.