超出曝光的曝光时间计算

最新推荐文章于 2025-09-16 11:32:22 发布

原创最新推荐文章于 2025-09-16 11:32:22 发布 · 1.8k 阅读

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本文介绍了一种在IMX214传感器上实现超出曝光的方法，通过创建属性节点进行控制，并提供了具体的实现代码示例。文章还讨论了曝光时间计算方法及注意事项。

根据项目需要,在IMX214的sensor上实现超出曝光,简单的做法就是创建一个属性节点,上层通过属性节点来操作超出曝光,通过测试,可以达到预期的效果,不过所用时间都是微秒级的,所以需要注意变量类型,再就是,MTK的32平台最长曝光时间是4-5s,超过这个时间,ISP就会自动重启.

static kal_uint32 CalcInus(void)
{
kal_uint32 LineInus[2]={0};
UINT16 Para16[2]={0};
UINT32 Para32;

//switch(IMX214CurrentScenarioId)
{
//case MSDK_SCENARIO_ID_VIDEO_PREVIEW:
//Para16[0]=imgsensor.line_length;//IMX214_FeatureControl_PERIOD_PixelNum;
//Para16[1]=imgsensor.frame_length;//IMX214_FeatureControl_PERIOD_LineNum;
//Para32 = imgsensor.pclk;//IMX214.videoPclk * 100000;
//break;
//case MSDK_SCENARIO_ID_CAMERA_ZSD:
//case MSDK_SCENARIO_ID_CAMERA_CAPTURE_JPEG:
//Para16[0]=imgsensor.line_length;//IMX214_FeatureControl_PERIOD_PixelNum;
//Para16[1]=imgsensor.frame_length;//IMX214_FeatureControl_PERIOD_LineNum;
//Para32 = imgsensor.pclk;//IMX214.capPclk * 100000; //19500000;
//break;
//default:
Para16[0]=imgsensor.line_length;//IMX214_FeatureControl_PERIOD_PixelNum;
Para16[1]=imgsensor.frame_length;//IMX214_FeatureControl_PERIOD_LineNum;
Para32 = imgsensor.pclk;//IMX214.pvPclk * 100000; //19500000;
//break;
}

printk("[ma] Para16[0]=%d,Para16[1]=%d,Para32=%d\n",Para16[0],Para16[1],Para32);
//LineInus[0]=(UINT32)(((unsigned long)Para16[0]*1000000+(Para32>>1))/Para32);
Para32=Para32/1000000;
printk("[ma] Para16[0]=%d,Para16[1]=%d,Para32=%d\n",Para16[0],Para16[1],Para32);
LineInus[0]=(UINT32)(((unsigned long)Para16[0]+(Para32>>1))/Para32);
printk("[ma] CalcInus=%d\n",LineInus[0]);
return LineInus[0];//us
}

void IMX214_SetShutterForD(kal_uint32 Eposuretime)
{
//printk("[ma][IMX214] X_SetShutter %d\n",iShutter);
//x1220_Shutter=iShutter;
//IMX214_write_shutter(iShutter);

kal_uint32 LineInus[2]={0};
kal_uint16 iShutter=0;

printk("[ma] IMX214_SetShutter Eposuretime=%d\n",Eposuretime);
LineInus[0]=CalcInus();
iShutter=(kal_uint32)(((Eposuretime))/LineInus[0]);
printk("[ma] IMX214_SetShutter %d\n",iShutter);
x1220_Shutter=iShutter;
if(iShutter!=0) write_shutter(iShutter);//IMX214_write_shutter(iShutter);
else printk("[ma] cancle IMX214_SetShutter %d\n",iShutter);
}
kal_uint32 IMX214_GetShutterForD(void)
{
//printk("[ma][IMX214] X_GetShutter %d\n",x1220_Shutter);
//return x1220_Shutter;
kal_uint32 LineInus[2]={0};
kal_uint32 Eposuretime=0;
printk("[ma] IMX214_GetShutter %d\n",cur_Shutter);
LineInus[0]=CalcInus();
Eposuretime=(kal_uint32)(cur_Shutter*LineInus[0]);///1000;
printk("[ma] IMX214_GetShutter Eposuretime=%d\n",Eposuretime);
return Eposuretime;
}