What is "time resolution"? Reply #75 – 2006-11-15 16:53:23 Quote from: SebastianG on 2006-11-15 16:30:26I happened to code a subpixel detector for "x-corners" (checkerboard corners) for the purpose of calibrating cameras. Luckily it can be shown that the areas around these x-corners show the mentioned symmetries which enables me to accurately measure the subpixel position of those x-corners (=saddle points) by analysing an optically-low-passed-&-sampled image of a checkerboard. Simulations showed that the real bottleneck is the censor noise actually.Interesting, in this case however you know what the checkboard looks like, unexpected deviations from a clean checkboard appearance, would introduce innaccuracy. It is a selective example not fully similar to resolving details in waveforms - which we can have few presumptions about.QuoteHowever, if you capture an image at high resolution with some censor noise and use a high quality resampler to reduce the image resolution you'll get pretty much the same locations for those x-corners -- meaning that the subpixel accuracy increased by the same factor I downsampled the image. (I tested this and IMHO this is not surprising). By your definition of time resolition (spatial resolution for images) this would mean that the two images would have the same spatial resolution.I dont fully agree with your case there, regard how you are locating nodes in a very ideal pattern (checkerboard). It will get complex to investigate fully, but the location of details when the source pattern is unpresumable (piano or violin, cymbal or triangle, square or saw or sine.. noise or not..) is a significant additional factor in recovering source material detail from pcm records.