Hi Jeffrey
On the PCB that I have done the DDS experiments on I also mounted two AL422 frame stores. I had them leftover from the earlier days of Hedghog.
My main reason for including a frame store was to see what field interpolation was like on a static picture(test card)
I did some experimenting with it. Using the present 6 line single field interpolater as a benchmark.
I first tried using 6 lines from one field and a 3 lines from the other the resultant picture was better that the 3 line on its own but worse than the 6 line.
I then calculated coefficients for a 11 line interpolater. 6 lines from one field 5 from the other. The result was not impressive, with no discernible difference between the 11 line and 6 line interpolaters. Since doing the experiments one thought that occurred to me was that I only ever tried one source of video. A free view box with the test card stored on a stick. It might be worth trying a different source some day when I get back to it.
Frank
On the PCB that I have done the DDS experiments on I also mounted two AL422 frame stores. I had them leftover from the earlier days of Hedghog.
My main reason for including a frame store was to see what field interpolation was like on a static picture(test card)
I did some experimenting with it. Using the present 6 line single field interpolater as a benchmark.
I first tried using 6 lines from one field and a 3 lines from the other the resultant picture was better that the 3 line on its own but worse than the 6 line.
I then calculated coefficients for a 11 line interpolater. 6 lines from one field 5 from the other. The result was not impressive, with no discernible difference between the 11 line and 6 line interpolaters. Since doing the experiments one thought that occurred to me was that I only ever tried one source of video. A free view box with the test card stored on a stick. It might be worth trying a different source some day when I get back to it.
Frank
