Hello,
I'm trying to do a video capture on EVMDM368 board from AcuteLogic PE1005S camera.
Camera inputs are connected to imager interface.
I would like to use existing streaming application.
I made custom driver, which simply sets CPLD to use imager as input (CPLD register 3),
set if_type = INTERFACE_TYPE_YCBCR_SYNC_16 of struct decoder_device, report std id=V4L2_STD_720P_60
Camera output set to 720P 60 as well.
I'm getting picture, luma seems correct, but colors are wrong and "too green".
Seem like byte order is ok - setting ISIF.CCDCFG.YCINSWP to 1 adds vertical stripes as expected.
camera data sheet says:
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3.5.1 Image data output format
16bit bus is used to provide YPbPr 4:2:2 formatted image data multiplexed as follows.
YC[15:8] Pb0 Pr0 Pb1
YC[7:0] Y0 Y1 Y2
Color cording is based on SMPTE 274M however, color difference data set to center (offset +128).
Y = 0.2126R’+0.7152G’+0.0722B’
Pb = 0.500B’- 0.1146R’- 0.3854G’ + 128
Pr = 0.500R’- 0.4542G’- 0.0458B’ + 128
R’,G’,B’ shows the original signals of non-linear domain after gamma correction.
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Camera documentation uses strange terminology for many parts, so I could "translate" it to the following:
Camera output format is 16 bit YCbCr 4:2:2, byte order is YUYV, color differences have an offset 128.
Seem like in my case I have unwanted offsets in color differences present. How How can I get rid of this offset?
Thank you,
Leonid
