An old thread.. but it’s similar to something I have in mind.. I’d need higher resolution too, but like the original poster only need that for part of the image.. so overall the no of pixels capped would be the same, but the area of the frame being captured from would be smaller.
Is it possible to build the grab from multiple frames? at least in the case I’m looking at (attempting to ‘read’ a set top box on-screen-display).. the display would remain constant for anything up to a minute or so.. I’d guess grab the 128 for a line once, then do it again, but with a 1 operation ‘delay’ to cause the sample points to be right shifted a little.. etc.. ?