Panasonic AG-DVX200PJ Tech Brief - Volume 3 - Page 5

At higher frame rates (i.e., faster than 60 frames per second), the camera has to employ di erent scanning techniques to achieve those faster frame rates. It uses a combination of pixel mixing, line skipping, and (depending on the frame rate) it may also crop the eld of view. ese techniques allow the sensor to be read even faster, which results in faster frame rates (and, thus, slower slow motion), but also further reduces the resolution of the video frames. Pixel-mixing has its advantages, certainly, but if you're looking for the absolute highest-quality FHD footage, that will still be achieved by downconverting 4K or UHD footage in post. Pixel mixing combines pixels and results in lower resolution and somewhat increased aliasing; downconverting supersampled 4K/UHD footage means you'll be able to retain the maximum resolution and most alias-free images possible. Pixel-mixing the FHD footage results in several advantages - wider eld of view, faster frame scan rate, minimized rolling shutter e ect, and lower noise. Downconverting 4K/UHD footage will result in the same reduction in noise, and higher overall image resolution and delity, and an increase in e ective color sampling and bit depth, but cannot o er the same reduction in rolling shutter or the expanded eld of view o ered by the pixel-mixed FHD footage. Summary e DVX200 windows its sensor to provide the optimal combination of pixel density, sensor read speed, and eld of view for each mode that it o ers. e resulting eld of view changes slightly between FHD, 4K, and UHD 24/25/30 modes, and results in a notable but necessary crop when going to UHD 50/60 mode. ese changes are necessary given the limitations of processing power and sensor read speed capability, and re ect a carefully-engineered balance between resolution, eld of view, and rolling shutter possible in each of the modes that the DVX200 o ers.