초록 ▼

Block and frame skipping decides which image regions, blocks or frames in a video frame or series of frames should be encoded. Block skipping detects in advance which of the blocks in a video frame will produce little or no bits, so that the encoder can skip the encoding process for these blocks. Bl

Block and frame skipping decides which image regions, blocks or frames in a video frame or series of frames should be encoded. Block skipping detects in advance which of the blocks in a video frame will produce little or no bits, so that the encoder can skip the encoding process for these blocks. Block skipping uses an iterative procedure to determine the optimal energy threshold value for each image frame. All the image blocks whose pixel energy is below the optimal threshold for the frame are skipped. Frame skipping predicts a distortion or image quality value for each frame. If some frames have a predicted image quality smaller than a preset value, these frames are allocated more bits and if, as a result, too few bits are left for future frames, the latter frames are skipped. This selective frame skipping guarantees that the quality of the non-skipped frames is above the preset value.

대표청구항 ▼

Block and frame skipping decides which image regions, blocks or frames in a video frame or series of frames should be encoded. Block skipping detects in advance which of the blocks in a video frame will produce little or no bits, so that the encoder can skip the encoding process for these blocks. Bl

Block and frame skipping decides which image regions, blocks or frames in a video frame or series of frames should be encoded. Block skipping detects in advance which of the blocks in a video frame will produce little or no bits, so that the encoder can skip the encoding process for these blocks. Block skipping uses an iterative procedure to determine the optimal energy threshold value for each image frame. All the image blocks whose pixel energy is below the optimal threshold for the frame are skipped. Frame skipping predicts a distortion or image quality value for each frame. If some frames have a predicted image quality smaller than a preset value, these frames are allocated more bits and if, as a result, too few bits are left for future frames, the latter frames are skipped. This selective frame skipping guarantees that the quality of the non-skipped frames is above the preset value. d the plug portion is comprised of a second type of acoustic foam. 34. The directional microphone assembly of claim 33 wherein the second type of open cell acoustic foam is more porous than the first type of acoustic foam. 35. The directional microphone assembly of claim 24 wherein the front and rear sound inlet paths have a controlled resonance in a desired sound pickup frequency range. 36. The directional microphone assembly of claim 24 wherein the removable directional microphone module further comprises a recess, and wherein the directional microphone element is mounted in the recess. 37. The directional microphone assembly of claim 36 further comprising a mechanical support located in the recess for mounting an extension tube. 38. The directional microphone assembly of claim 23 wherein the plurality of different directional mounting positions are discretely spaced. 39. The directional microphone assembly of claim 23 wherein the plurality of different directional mounting positions are substantially equally spaced from a reference axis. 40. The directional microphone assembly of claim 39 comprising four mounting positions. 41. The directional microphone assembly of claim 23 wherein the mounting system comprises a plurality of index notches and at least one mounting surface, and wherein the removable directional microphone module has at least one index tab, the at least one index tab engaging at least one of the plurality of index notches in mating relation when the mounting system mounts and locks the removable module. 42. The directional microphone assembly of claim 41 wherein the mounting surface is generally circular in shape and the index notches are located around the mounting surface. 43. The directional microphone assembly of claim 42 wherein an index notch is located at every 30° angle from a reference axis. 44. The directional microphone assembly of claim 42 wherein the index notches are equally spaced from a reference axis. 45. A directional microphone assembly comprising: a removable directional microphone module; a receiving unit; a mounting system located in the receiving unit that releasably mounts and locks the removable directional microphone module at a plurality of different directional mounting positions within the receiving unit; and a windscreen comprised of at least two portions, and having a ring portion and a plug portion, the plug portion fitting into the ring portion. 46. The directional microphone assembly of claim 45 wherein the ring portion is comprised of a first type of open cell acoustic foam and the plug portion is comprised of a second type of open cell acoustic foam. 47. The directional microphone assembly of claim 46 wherein the second type of open cell acoustic foam is more porous than the first type of open cell acoustic foam.