Grass Valley Switcher Products - Manual (Page 137)

Switcher Products — Protocols Manual 137
SD Image Data File Format
Note Values for Pixels per Line and Lines in Field1/Field2 are active video pixels
only. Total bytes per frame includes pad bytes.
SD Full Size File Format / Size Calculations
Vertical and horizontal image start points are defined in CCIR 601. A full
screen image in the Kalypso still store is equivalent to the production aper-
ture defined in SMPTE RP-187.
Each line of a full screen image, consists of 720 pixels packed into 1920 bytes
as described above, followed by 128 pad bytes so that each line occupies
0x800 bytes.
A 525/60 field 1 contains 244 lines. A 525/60 field 2 contains 243 lines. Both
fields are padded such that each occupies 0x80000 bytes and a frame occu-
pies 0x100000 bytes (1,048,576).
Both fields for a 625/50 image contain 288 lines. 625/50 fields are not
padded with additional lines. Each field in a full raster 625/50 image is
0x90000 bytes so a frame is 0x120000 bytes (1,179,648).
Table 118. SD Format Data Amounts
Frame
Rate
Fence Size
Pixels
per Line
Bytes
per Line
Lines Pixel Groups
per Line
Total Bytes
per Frame Field 1 Field 2
525/60
Full 720 1920 244 243 30 1,048,576
1/4 360 960 122 121 15 234,240
1/9 240 640 81 81 10 103,680
1/25 144 384 48 48 6 36,864
625/50
Full 720 1920 288 288 30 1,179,648
1/4 360 960 144 144 15 276,480
1/9 240 640 96 96 10 122,880
1/25 144 384 57 57 6 43,776