海康USB相机新增自动曝光模式支持

mvs_u_takephoto/takephoto.c

@@ -12,16 +12,19 @@ typedef struct
   HANDLE      hCam;
   EImgType    saveImgType;
   const char *saveImgFilename;
-  HANDLE      hESig; // 任务结束的通知
-  int         rCode; // 任务结束返回值
+  bool        isExposureAuto; // 自动曝光:是/否
+  struct timespec expTime0;   // 曝光开始的时间
+  HANDLE      hESig;          // 任务结束的通知
+  int         rCode;          // 任务结束返回值
 } PthotoProcCtx;
 
 static int PhotoProc(unsigned long wParam, unsigned long lParam) // 线程回调函数,执行一次拍照任务
 {
-  PthotoProcCtx *ctx = (PthotoProcCtx *)wParam; MV_FRAME_OUT frame = { 0 };
+  PthotoProcCtx *ctx = (PthotoProcCtx *)wParam; MV_FRAME_OUT frame = { 0 }; int ret;
 
   // 1, 触发一次拍照
-  int ret = MV_CC_SetCommandValue(ctx->hCam, "TriggerSoftware");
+getp:
+  ret = MV_CC_SetCommandValue(ctx->hCam, "TriggerSoftware");
 
   // 2, 等待获取图像
   if(MV_OK == ret)
@@ -36,6 +39,13 @@ static int PhotoProc(unsigned long wParam, unsigned long lParam) // 线程回调
     sw_log_debug("[%s] +++GetOneFrame+++, Width[%d], Height[%d], FrameNum[%d], FrameLen[%d], PixelType[0x%08X]", MODULE_NAME, \
                   frame.stFrameInfo.nWidth, frame.stFrameInfo.nHeight, frame.stFrameInfo.nFrameNum, frame.stFrameInfo.nFrameLen, \
                   (unsigned int)frame.stFrameInfo.enPixelType);
+    if(ctx->isExposureAuto)
+    { // 自动曝光模式下, 等待15秒后的图像清晰度才可用
+      struct timespec now; clock_gettime(CLOCK_MONOTONIC, &now);
+      long elapsed = (now.tv_sec - ctx->expTime0.tv_sec)*1000 + (now.tv_nsec-ctx->expTime0.tv_nsec)/(1000*1000);
+      sw_log_debug("[%s] +++GetOneFrame+++, 等待曝光完成, elapsed=%ldms", MODULE_NAME, elapsed);
+      if(elapsed < 15*1000) { MV_CC_FreeImageBuffer(ctx->hCam, &frame); goto getp/*继续取图像*/; }
+    }
     ret = SavePhoto(ctx->hCam, &frame, ctx->saveImgType, ctx->saveImgFilename);
     MV_CC_FreeImageBuffer(ctx->hCam, &frame);
   }
@@ -135,6 +145,16 @@ int TakePhoto(EImgType imgType, const char *saveImgFilename, int timeout, SImgMa
     goto end_p;
   }
 
+  MVCC_ENUMVALUE ExposureMode =  { 0 };
+  ret =  MV_CC_GetExposureAutoMode(hCam, &ExposureMode);
+  if(MV_OK != ret)
+  {
+    sw_log_error("[%s] 获取-曝光模式失败, errCode=0x%x!!", MODULE_NAME, ret);
+    goto end_p;
+  }
+  if(ExposureMode.nCurValue != MV_EXPOSURE_AUTO_MODE_OFF) { ctx.isExposureAuto = true; clock_gettime(CLOCK_MONOTONIC, &ctx.expTime0); }
+  else ctx.isExposureAuto = false;
+
   ctx.hCam = hCam;
   ctx.saveImgType = imgType;
   ctx.saveImgFilename = saveImgFilename;

tests/mvs_u_takephoto/main.go

@@ -31,7 +31,7 @@ func main() {
 		var err error
 
 		start := time.Now()
-		imgMark, err = camera.TakePhoto(imgType, imgFile, 60)
+		imgMark, err = camera.TakePhoto(imgType, imgFile, 180)
 		elapsed := time.Since(start).Milliseconds()
 
 		if err == nil {