The frame height simply divides the vertical scale by the number of bins. So if you configured it for a 100dB range, then each bin is 100/256 dB in height. If a signal is outside this range, it is usually clamped to the upper or lower bin in a column.
For the width, if it exceeds a certain width we will start binning. For example, 16416 / 513 = 32. So each column will contain 32 frequency bins from each sweep. We accumulate all 32 independently in one column as opposed to creating a much larger image.
Each full frame is roughly 1/30th of a second of sweeps. So you will get ~30 frames per second.
