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Video Basics

Video Basics. Introduction ---- video industry Video Imaging ---- video scan, aspect ratio Color and Composite & component systems From Analog To Digital Video Spatial Conversions ---- video formats Temporal Conversions Mixing And Keying. Onde temos vídeo?. Provedores de vídeo.

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Video Basics

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  1. Video Basics • Introduction ---- video industry • Video Imaging ---- video scan, aspect ratio • Color and Composite & component systems • From Analog To Digital Video • Spatial Conversions ---- video formats • Temporal Conversions • Mixing And Keying

  2. Onde temos vídeo?

  3. Provedores de vídeo

  4. Aplicações de vídeo digital Pay-per-view Surfar, email, homebanking Multimídia sob demanda Video telefonia

  5. Vantagens de vídeo digital • Open Architecture video systems, meaning the existence ofvideo at multiple spatial, temporal, and SNR resolutionwithin a single scalable bitstream • Interactivity • Variable-rate transmission on demand • Easy software conversion from one standard to another • Integration of various video applications • Editing capabilities, such as cutting and pasting, zooming • removal of noise and blur • Robustness to channel noise and ease of encryption • …...

  6. Sistema de vídeo do futuro

  7. Imagens e vídeo - definições Imaging:normal photography, X-rays, electronic documents,electronic still pictures, motion pictures, TV Video:a sequence of still pictures of a scene taken atvarious subsequent intervals in time Scanning:a form of sampling of a continuously varyingtwo-dimensional signal

  8. Resolução de vídeo • Viewing Ratio (VR): • VR = d /PHd= viewer’s distance from the screen • PH= picture height • Visible pixels = 3440 /VR • Pixel (Pel) : the smallest detail that can be reproduced in apicture is about the size of a picture element Minimum viewing rates

  9. Taxa de refresh e flicker Persistence of vision,causes the visual system responds slowlyto rapid changes of illumination Flicker:if the illumination varies cyclically at a low frequency, the eye may perceive an annoying effect Refresh Rate:the light output of display devices decays after a short time, and thereforemust be refreshed periodically to maintain the effect of steady illumination Display refresh rates

  10. scanear uma imagem de vídeonão entrelaçado

  11. scanear uma imagem de vídeoentrelaçado

  12. Relação largura/altura IAR (Image Aspect Ratio )is defined as the ratio of picture width to height • IAR = w / h • PAR (pel aspect ratio) =IAR * vertical_size / horizontal_size where horizontal_size is the width of the image in terms of pelsand vertical_size is the height of the image in lines ex.Display IAR = 4:3 Image size = 720 pels * 486 lines PAR = 4/3 x 486/720 = 0.9 or IAR * display_vertical_size / display_horizontal_size

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