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DM365 IPNC LSC issue

Hi:

I'm developing a DM365+OV9712 project based on IPNC RDK 4.1.0 and met a problem after enable LSC.

After LSC tuning according to ITT user's guide and sending LSC parameters, lens shading get improved. but there is a dark area in the bottom part of image, as shown in below capture. There is no such dark area before LSC tuning. (Pls ignore the color as calibration and AWB is not done yet)

I tried to adjust the LSC parameters but it didn't help.

Could anyone help me and give suggestion? Thanks!

Below is my LSC parameters window after tuning finished:

GetFromCamera : ISIF LSC
enable :1
GetFromCamera : ISIF LSC
inWidth :1280
GetFromCamera : ISIF LSC
inHeight :720
GetFromCamera : ISIF LSC
paxelWidth :16
GetFromCamera : ISIF LSC
paxelHeight :8
GetFromCamera : ISIF LSC
gainFormat :5
GetFromCamera : ISIF LSC
offsetEnable :0
GetFromCamera : ISIF LSC
offsetScale :0
GetFromCamera : ISIF LSC
offsetShift :0
GetFromCamera : ISIF LSC
initX :0
GetFromCamera : ISIF LSC
initY :0
GetFromCamera : ISIF LSC
gainTableAddr :4777152
GetFromCamera : ISIF LSC
gainTableLineOffset :324
GetFromCamera : ISIF LSC
offsetTableAddr :4875456
GetFromCamera : ISIF LSC
offsetTableLineOffset :0
GetFromCamera : ISIF LSC
intSofEnable :0
GetFromCamera : ISIF LSC
intPreFetchErrorEnable :0
GetFromCamera : ISIF LSC
intDoneEnable :0