The parameters for F_DeFlicker2 are described below.
DeFlicker Amount - Use this to reduce flicker without removing it entirely; smaller values mean more will be left behind.
Block Size - To find where a certain pixel is located in the analysis range, the deflicker algorithm looks for a block of pixels centered around that pixel. Block size defines the width and height of these blocks (in pixels). On rare occasions, a large block size can produce data that’s lacking in detail. This is because a small feature can fit into a large block, causing the motion estimation to concentrate on the background motion and ignore the small feature. A small value, instead, can produce a noisy motion field, as there aren’t enough constraints in a small block to fit the motion accurately. In most cases, however, the default value is small enough so that details aren’t lost, and the smoothing step of the algorithm ensures the motion field isn’t too noisy. Therefore, this value very rarely needs editing.
Use Motion - Turn this on to do a second deflicker pass using motion-compensated frames. This can improve results in areas where there is fast motion, where the initial deflicker pass can introduce blurring.
Vector Detail - Determines the density of the motion vectors used when Use Motion is turned on. The maximum value of 1 will generate one vector per pixel. This will produce the most accurate vectors but will take longer to render. A value of 0.5 will generate a vector at every other pixel.
Analysis Range - The number of frames searched each side of the current frame when calculating the flicker. Higher values may give better results, but can also bring in erroneous information and take longer to process.