SDI Technologies iH30 Especificações descarregar pdf (Página 68)

Advanced Topics

Quadro SDI Output PG-03776-001_v06 | 63

Scale (8-bit) Scale (10-bit)

Y = (235-16) / 256 = 0.85546875 Y = (940-64) / 1024 = 0.85546875

Cb = (240-16) / 256 = 0.875 Cb = (960-64) / 1024 = 0.875

Cr = (240-16) / 256 = 0.875 Cr = (260-64) / 1024 = 0.875

RGB[0,255] from ITU-R BT.709 [0,255]

RGB[0,255] from ITU-R BT.709 [0,247]

Offset (8-bit) Offset(10-bit)

Y = 4/251 = 0.015936 Y = 4/1019 = 0.0039254

Cb = (251+4)/2 / (255) = 0.5 Cb = (1019+4)/2 / (1023) = 0.5

Cr = (251+4)/2 / (255) = 0.5 Cr = (1019+4)/2 / (1023) = 0.5

Scale (8-bit) Scale (10-bit)

Y = (251-4) / 256 = 0.964844 Y = (1019-4) / 1024 = 0.99121

Cb = (251-4) / 256 = 0.964844 Cb = (1019-4) / 1024 = 0.99121

Cr = (251-4) / 256 = 0.964844 Cr = (1019-4) / 1024 = 0.99121

10.4 FULL-SCENE ANTIALIASING

Full-scene antialiasing (FSAA) is required when computer-generated images are utilized

in video and broadcast applications in order to remove the stair step artifacts caused by

high-frequency transitions commonly found in point-sampled images. FSAA is

implemented using a multisampling technique where the GPU uses multiple color

samples to calculate the final pixel color. An application can utilize multisampling with

both pbuffers and buffer objects as described in the next section.

10.4.1 Pbuffer Multi-Sampling

An application sending pbuffers to the SDI device with the WGL_video_out or

GLX_video_out OpenGL extensions that wishes to apply FSAA to the SDI video output

must request a multi-sampled pixel format for pbuffer creation. Once a multi-sampled

pbuffer is created, multisampling must be enabled within OpenGL. These steps are

outlined in Code Listing 45.

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SDI Technologies iH30 Especificações Página 68