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Balance White (dart E)#

Balance White 相機功能可讓您手動校正色偏，使拍攝的影像中白色物體呈現白色。

為此，可以針對每個色彩通道（紅、綠、藍）套用數位增益校正。

使用功能#

為什麼要執行白平衡校正#

相機擷取的影像可能帶有色偏，亦即帶有特定色彩的色調。這是因為不同的光源具有不同的色溫。日光燈會使影像帶有藍色調，而鎢絲燈則會使影像帶有黃色調。

白平衡功能可讓您透過調整紅、綠、藍三原色的強度來校正這些色偏。因此，白色物件在擷取的影像中會顯示為白色。

執行白平衡校正#

若要執行白平衡校正：

  1. 將相機中的 BalanceRatioSelector 參數設為其中一個可用的色彩通道（Red, Green，或 Blue)。

  2. 調整 BalanceRatio 所選色彩通道的參數值：

    • 平衡比率 = 1： 該色彩的強度保持不變。
    • 平衡比率 > 1： 相對於其他兩個色彩，該色彩的強度會增加。
    • Balance ratio < 1: The intensity of the color is decreased relative to the other two colors. (This is only possible if your camera model supports balance ratio values lower than 1.)

  3. 針對所有可用的色彩通道，重複步驟 1 和 2。

強度的增加或減少是成比例的。例如，如果某個色彩的平衡比率設為 1.2，則該色彩的強度會增加 20 %。

資訊

  • 指定低於 1 的平衡比率也會降低該色彩可以達到的最大強度。除非您想要校正某個色彩過度主導的情況，否則不建議指定低於 1 的平衡比率。

範例程式碼#

// Set the red intensity to 108.789%
camera.BalanceRatioSelector.SetValue(BalanceRatioSelector_Red);
camera.BalanceRatio.SetValue(1.08789);
// Set the green intensity to 100%
camera.BalanceRatioSelector.SetValue(BalanceRatioSelector_Green);
camera.BalanceRatio.SetValue(1);
// Set the blue intensity to 219.678%
camera.BalanceRatioSelector.SetValue(BalanceRatioSelector_Blue);
camera.BalanceRatio.SetValue(2.19678);

INodeMap& nodemap = camera.GetNodeMap();
// Set the red intensity to 108.789%
CEnumParameter(nodemap, "BalanceRatioSelector").SetValue("Red");
CFloatParameter(nodemap, "BalanceRatio").SetValue(1.08789);
// Set the green intensity to 100%
CEnumParameter(nodemap, "BalanceRatioSelector").SetValue("Green");
CIntegerParameter(nodemap, "BalanceRatio").SetValue(1);
// Set the blue intensity to 219.678%
CEnumParameter(nodemap, "BalanceRatioSelector").SetValue("Blue");
CFloatParameter(nodemap, "BalanceRatio").SetValue(2.19678);

// Set the red intensity to 108.789%
camera.Parameters[PLCamera.BalanceRatioSelector].SetValue(PLCamera.BalanceRatioSelector.Red);
camera.Parameters[PLCamera.BalanceRatio].SetValue(1.08789);
// Set the green intensity to 100%
camera.Parameters[PLCamera.BalanceRatioSelector].SetValue(PLCamera.BalanceRatioSelector.Green);
camera.Parameters[PLCamera.BalanceRatio].SetValue(1);
// Set the blue intensity to 219.678%
camera.Parameters[PLCamera.BalanceRatioSelector].SetValue(PLCamera.BalanceRatioSelector.Blue);
camera.Parameters[PLCamera.BalanceRatio].SetValue(2.19678);

/* Macro to check for errors */
#define CHECK(errc) if (GENAPI_E_OK != errc) printErrorAndExit(errc)
GENAPIC_RESULT errRes = GENAPI_E_OK;  /* Return value of pylon methods */
/* Set the red intensity to 108.789% */
errRes = PylonDeviceFeatureFromString(hdev, "BalanceRatioSelector", "Red");
CHECK(errRes);
errRes = PylonDeviceSetFloatFeature(hdev, "BalanceRatio", 1.08789);
CHECK(errRes);
/* Set the green intensity to 100% */
errRes = PylonDeviceFeatureFromString(hdev, "BalanceRatioSelector", "Green");
CHECK(errRes);
errRes = PylonDeviceSetIntegerFeature(hdev, "BalanceRatio", 1);
CHECK(errRes);
/* Set the blue intensity to 219.678% */
errRes = PylonDeviceFeatureFromString(hdev, "BalanceRatioSelector", "Blue");
CHECK(errRes);
errRes = PylonDeviceSetFloatFeature(hdev, "BalanceRatio", 2.19678);
CHECK(errRes);

# Set the red intensity to 108.789%
camera.BalanceRatioSelector.Value = "Red"
camera.BalanceRatio.Value = 1.08789
# Set the green intensity to 100%
camera.BalanceRatioSelector.Value = "Green"
camera.BalanceRatio.Value = 1
# Set the blue intensity to 219.678%
camera.BalanceRatioSelector.Value = "Blue"
camera.BalanceRatio.Value = 2.19678

/* Macro to check for errors */
#define CHECK(errc) if (GENAPI_E_OK != errc) printErrorAndExit(errc)
GENAPIC_RESULT errRes = GENAPI_E_OK;  /* Return value of pylon methods */
/* Set the red intensity to 108.789% */
errRes = PylonDeviceFeatureFromString(hdev, "BalanceRatioSelector", "Red");
CHECK(errRes);
errRes = PylonDeviceSetFloatFeature(hdev, "BalanceRatio", 1.08789);
CHECK(errRes);
/* Set the green intensity to 100% */
errRes = PylonDeviceFeatureFromString(hdev, "BalanceRatioSelector", "Green");
CHECK(errRes);
errRes = PylonDeviceSetIntegerFeature(hdev, "BalanceRatio", 1);
CHECK(errRes);
/* Set the blue intensity to 219.678% */
errRes = PylonDeviceFeatureFromString(hdev, "BalanceRatioSelector", "Blue");
CHECK(errRes);
errRes = PylonDeviceSetFloatFeature(hdev, "BalanceRatio", 2.19678);
CHECK(errRes);

您也可以使用 pylon Viewer 輕鬆設定參數。