ZR36016 Просмотр технического описания (PDF) - Zoran Corporation

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ZR36016

INTEGRATED COLOR SPACE / RASTER-TO-BLOCK CONVERTER

Zoran Corporation 

Integrated Color Space / Raster-To-Block Converter

PXIN

23:16

15:8

7:0

Color/Format

Conversion

(4:2:2)

Decimation

MDATA 15:8

Strip

Buffer

7:0

R0 R1

G0 G1

B0 B0

Y0 Y1

Cb0 Cr0

Y0

Cb0

Y0

Y2

R2 R3

G2 G3

B0 B0

Y2 Y3

Cb2 Cr2

Y2

Cr0

Y4

Y6

R4 R5

G4 G5

B0 B0

Y4 Y5

Cb4 Cr4

Y4

Cb4

Cb0

Cb4

R6 R7

G6 G7

B0 B0

Y6 Y7

Cb6 Cr6

Y6

Cr4

Cr0

Cr4

Figure 12. Typ. Data Flow from PXIN Bus to Strip Buffer

Mathematical Expressions For Color Space Conversions

and Decimation/Interpolation (Format Conversion)

Expression of RGB toYC4:4:4 Conversion

• 8-bit Full-scale (CCIR = 0)

Yxx = 0.299Rxx + 0.587Gxx + 0.11Bxx

Crxx = 0.713 (Rxx – Yxx)

Cbxx = 0.564 (Bxx – Yxx)

• CCIR Standard (CCIR = 1)

Yxx = 0.299Rxx + 0.587Gxx + 0.11Bxx

Crxx = 0.729 (Rxx – Yxx)

Cbxx = 0.577 (Bxx – Yxx)

Expression of YC4:4:4 to YC4:2:2 Conversion

• Simple Decimation (SBFL = 0)

Yxx = Yxx

Crxx = Crxx

Cbxx = Cbxx

• Filter (SBFL = 1)

Yxx = Yxx

Crxx = C-----r--x-----(--x-----–----1----)----+-----2----C---4-r---x---x----+-----C-----r--x-----(--x-----+-----1---)--

Cbxx = -C----b---x-----(--x-----–----1----)----+-----2----C----4b----x---x----+-----C-----b---x-----(--x-----+-----1---)--

Expression of YC4:2:2 toYC4:1:1(H2V2) Conversion (vertical

decimation only, no horizontal)

• Simple Decimation (SBFL = 0 or 1)

Yxx = Yxx

Crxx = Crxx

Cbxx = Cbxx

RGB

R00 R01

R10 R11

YC 4:4:4

Y00 Y01

Y10 Y11

YC 4:4:2

Y00 Y01

Y10 Y11

YC 4:1:1 (H2V2)

Y00 Y01

Y10 Y11

G00 G01

G10 G11

Cr00 Cr01

Cr10 Cr11

Cr00

Cr10

Cr00

G00 G01

G10 G11

Cb00 Cb01

Cb10 Cb11

Cb00

Cb10

Cb00

Figure 13. Decimation Flow

Expression of YC4:1:1(H2V2) to YC4:2:2 Conversion (Vertical

interpolation only)

• Simple Interpolation (SBFL = 0 or 1)

Yxx = Yxx

Crxx = Crxx, Cr (x + 1) x = Crxx

Cbxx = Cbxx, Cb (x + 1) x = Cbxx

Expression of YC4:2:2 to YC4:4:4 Conversion

• Simple Interpolation (SBFL = 0)

Yxx = Yxx

Crxx = Crxx, Crx (x + 1) = Crxx

Cbxx = Cbxx, Cbx (x + 1) = Cbxx

• Filter (SBFL = 1)

Yxx = Yxx

Crx (x + 1) = -C----r--x----x----+-----C----2-r--x-----(--x-----+-----2---)-

Cbx (x + 1) = -C----b---x----x----+-----C----2-b---x-----(--x-----+-----2---)-

Expression of YC4:4:4 to RGB Conversion

• 8-bit Full-scale (CCIR = 0)

Rxx = Yxx + 1.37Crxx

Gxx = Yxx – 0.714Crxx – 0.344Cbxx

Bxx = Yxx + 1.772Cbxx

• CCIR Standard (CCIR = 1)

Rxx = Yxx + 1.37Crxx

Gxx = Yxx – 0.698Crxx – 0.336Cbxx

Bxx = Yxx + 1.73Cbxx

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