Quarter common intermediate format qcif 四分之一通用中間格式
Qcif quarter common intermediate format 四分之一通用中間格式
Its sampling rate can reach up to 30 frames per second when using qcif format , while 15 frames per second can be obtained for cif format 當采用cif格式采集時,幀率為15幀秒,采用qcif格式采集時,幀率可達到30幀秒。
Based on the configuration features of tms320c6416 , the encoder of h . 264 is implemented by using assembly language . the h . 264 encoder that we have implemented on tms320c6416 has a high processing speed . it can comprocess 27 . 5 frames of qcif video images per second in real - time when the cpu frequency of tms320c6416 is 720mhz 本文實現(xiàn)的h . 264編碼器性能為:在主頻為720mhz的tms320c6416芯片上對2路qcif格式的視頻圖像進行處理,在一定的保真度條件下,編碼速度達到了27 . 5幀/秒。
This method is especially suitable for small mobile devices such as handheld pcs , palm - size pcs and mobile phones that possess small display screens and light computational power , and work in low bandwidth wireless networks . the system rtbvideo based on the technique mentioned above typically provides qcif - size video with a frame rate of 5 - 15 fps for a 9 . 6 kbps bandwidth in the internet 在上述技術的基礎上開發(fā)的基于internet互聯(lián)網(wǎng)的實時視頻傳輸系統(tǒng)rtbvideo ,能夠提供格式為qcif ( 176 144 )的視頻,人體輪廓清晰,畫面穩(wěn)定流暢,且在9 . 6kbps帶寬下能達到每秒5 - 15幀。
Using the above algorithms , h . 263 baseline video - encoder implementation can encode more than 40fps in qcif resolution on a pentium mmx 500 - mhz computer . almost ali of the low bit - rate video compression techniques degrade quality . to combine the video quality evaluation with hvs , the relationship betvveen the motion activity and perceptual video quality are studied , and a video quality evaluation method based on motion activity is proposed , in which video defmition and smoothness are defined 本文提出一種基于運動特征的視頻質(zhì)量評價方法,考慮了人眼對視頻信號感受質(zhì)量與畫面運動劇烈程度之間的關系,分別討論了反映視頻質(zhì)量的視頻清晰度和流暢度,評價結果更符合人眼視覺特性,并且這種評價對編碼具有一定的指導作用。