Key topics:
Frames movement automatical adaption
Image anti-sawtooth: if primitive image size and screen size differ too much, then demonstrated time needs the image enlargement. Due to the enlargement effect provided in different video cards, some sawtooth phenomena can be very obvious. When this item is checked, Cool DVD Player can determine whether to use the software anti-sawtooth algorithms to eliminate or to reduce the sawtooth phenomenon according to the image and the screen size. If the current clip does not need the anti-sawtooth, this item is disabled.
Deinterfacing
Technology background:
MPEGStandard video flows consist of movement image sequences.Sequence basic unit if frame or field.One frame consist of two fields.Between each field there exists time difference.In display device that only supports scanning line-by-line,strong virtual images of movement generate during playback of frames.So the fields should turn to frames before playback.Cool DVD Player has adopted many kinds of effective technology that is deinterfacing technology.
Image not deinterfaced:
Image deinterfaced:
Fast and effective,adopted by most application software.The shortcoming is that high speeding movement should bring obvious virtual images.
Automatic adaptation of frame movement
Effective on eliminating the virtual image of high speeding movement, but the system consumption is correspondingly high.
Multiple fields space forecast automatical adaption
A kind of extremely complex deinterlacing technology,system resource cost too much.Not available in current version of Cool DVD Player.
Technology abstract:
The basic encoding unit of frame or field is macro block.Deinterlacing technology takes macro block as unit,processing after decoding the macro block.
1: Movement detection.First determine two fields in close time, refer to macro blocks in close position,computate the movement vector of horizontal and vertical directions.If the vector equals to zero,directly merge the macro blocks. If movement vector is non-zero,computate the movement differences of two macro blocks of the two fields.If the difference is small, merge them directly.
2: If the difference is big in the neighboring two fields,search the best compensate effect image movement block in the circumambience of down field macro block movement vector. If exist suitable data,then merge the up-half field with the down-half filed having been repaired.
3: If the movement block matched is not found,then carry on compenstates to macro block neighboring and similar to up-half field macro block, at grads direction of the up-down fileds macro blocks movement vector
4: If not exist this kind of movement block,computate the energy distributions of macro block and do the double line stretch at the best energy grads direction to substitute the down-half field data.
