diff options
| author | Frank Schaefer <fschaefer.oss@googlemail.com> | 2017-04-16 20:35:42 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-04-19 14:55:07 +0300 |
| commit | 06dd8f7791ed9ec284a847ee5089850c00d71fd8 (patch) | |
| tree | 6cb2c1d692109584cdecb90621cab31fd23b3853 /drivers/media | |
| parent | d81638eadded798819c6ad3d31575f2ae7ac8929 (diff) | |
| download | linux-06dd8f7791ed9ec284a847ee5089850c00d71fd8.tar.xz | |
[media] ov2640: add information about DSP register 0xc7
According to ov2640 software application notes, there are two Automatic
White Balance (AWB) modes, which are selected by DSP register 0xc7:
1) Simple AWB: assumes the average color is gray
+ independent from lens
- doesn't work well if captured area contains unbalanced colors
(e.g. large blue background)
2) Advanced AWB: uses color temperature information
+ more accurate, works with all image contents
- lens specific, requires calibration
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/i2c/ov2640.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/media/i2c/ov2640.c b/drivers/media/i2c/ov2640.c index 33c849cb0030..e207d1dd003c 100644 --- a/drivers/media/i2c/ov2640.c +++ b/drivers/media/i2c/ov2640.c @@ -106,6 +106,10 @@ #define CTRL1_AWB_GAIN 0x04 #define CTRL1_LENC 0x02 #define CTRL1_PRE 0x01 +/* REG 0xC7 (unknown name): affects Auto White Balance (AWB) + * AWB_OFF 0x40 + * AWB_SIMPLE 0x10 + * AWB_ON 0x00 (Advanced AWB ?) */ #define R_DVP_SP 0xD3 /* DVP output speed control */ #define R_DVP_SP_AUTO_MODE 0x80 #define R_DVP_SP_DVP_MASK 0x3F /* DVP PCLK = sysclk (48)/[6:0] (YUV0); @@ -449,7 +453,7 @@ static const struct regval_list ov2640_init_regs[] = { { 0xc5, 0x11 }, { 0xc6, 0x51 }, { 0xbf, 0x80 }, - { 0xc7, 0x10 }, + { 0xc7, 0x10 }, /* simple AWB */ { 0xb6, 0x66 }, { 0xb8, 0xA5 }, { 0xb7, 0x64 }, |