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MT9M114 Fiches technique(PDF) 29 Page - ON Semiconductor |
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MT9M114 Fiches technique(HTML) 29 Page - ON Semiconductor |
29 / 45 page MT9M114 www.onsemi.com 29 50 Hz environment), flicker cannot be avoided. The MT9M114 supports an indoor AE mode, that will ensure flicker-free operation (VAR8 = 18, 0x0078[0] = 0x1 or REG = 0xC878[0] = 0x1). The MT9M114 will calculate all flicker parameters based on the sensor settings which are programmed in the Cam Control variables. This means the user only needs to select if 50- or 60-Hz flicker needs to be avoided (VAR 0x12, 0x008B or R0xC88B = 50 for 50-Hz flicker avoidance and 60 for 60-Hz avoidance). Output Conversion and Formatting The YUV data stream can either exit the color pipeline as is or be converted before exit to an alternative YUV or RGB data format. Color Conversion Formulas Y’U’V’: This conversion is BT 601 scaled to make YUV range from 0 through 255. This setting is recommended for JPEG encoding and is the most popular, although it is not well defined and often misused in various operating systems. Y + 0.299 R ) 0.587 G ) 0.114 B (eq. 1) U + 0.564 (B * Y ) ) 128 (eq. 2) V + 0.713 (R * Y ) ) 128 (eq. 3) There is an option where 128 is not added to U’V’. Y’Cb’Cr’ Using sRGB Formulas: The MT9M114 implements the sRGB standard. This option provides YCbCr coefficients for a correct 4:2:2 transmission. NOTE: 16 < Y601< 235; 16 < Cb < 240; 16 < Cr < 240; and 0 < = RGB < = 255. Y + (0.2126 R ) 0.7152 G ) 0.0722 B ) (eq. 4) (219 256) ) 16 Cb + 0.5389 (B * Y ) (224 256) ) 128 (eq. 5) Cr + 0.635 (R * Y ) (224 256) ) 128 (eq. 6) Y’U’V’ Using sRGB Formulas: These are similar to the previous set of formulas, but have YUV spanning a range of 0 through 255. Y + 0.2126 R ) 0.7152 G ) 0.0722 B (eq. 7) U + 0.5389 (B * Y ) ) 128 + (eq. 8) +* 0.1146 R * 0.3854 G ) 0.5 B ) 128 V + 0.635 (R * Y ) ) 128 + (eq. 9) + 0.5 R * 0.4542 G * 0.0458 B ) 128 There is an option to disable adding 128 to U’V’. The reverse transform is as follows: R + Y ) 1.5748 (V * 128) (eq. 10) G + Y * 0.1873 (U * 128) * 0.4681 (V * 128) (eq. 11) B + Y ) 1.8556 (U * 128) (eq. 12) Uncompressed YUV/RGB Data Ordering The MT9M114 supports swapping YCbCr mode, as illustrated in Table 14. Table 14. YCbCr OUTPUT DATA ORDERING Mode Data Sequence Default (No Swap) Cbi Yi Cri Yi+1 Swapped CrCb Cri Yi Cbi Yi+1 Swapped YC Yi Cbi Yi+1 Cri Swapped CrCb, YC Yi Cri Yi+1 Cbi The RGB output data ordering in default mode is shown in Table 15. The odd and even bytes are swapped when luma/chroma swap is enabled. R and B channels are bitwise swapped when chroma swap is enabled. Table 15. RGB ORDERING IN DEFAULT MODE Mode (Swap Disabled) Byte D7 D6 D5 D4 D3 D2 D1 D0 565RGB Odd R7 R6 R5 R4 R3 G7 G6 G5 Even G4 G3 G2 B7 B6 B5 B4 B3 555RGB Odd 0 R7 R6 R5 R4 R3 G7 G6 Even G4 G3 G2 B7 B6 B5 B4 B3 444xRGB Odd R7 R6 R5 R4 G7 G6 G5 G4 Even B7 B6 B5 B4 0 0 0 0 x444RGB Odd 0 0 0 0 R7 R6 R5 R4 Even G7 G6 G5 G4 B7 B6 B5 B4 |
Numéro de pièce similaire - MT9M114_1 |
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Description similaire - MT9M114_1 |
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