Balance White#

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

為此，可針對每個色彩通道（紅、綠、藍）分別進行數位增益校正。

若要自動校正色彩偏移，請使用「Balance White 」的「自動」功能。

使用功能#

為何要進行白平衡校正#

相機拍攝的影像可能會出現色偏，也就是帶有某種特定顏色的色調。這是因為不同的光源具有不同的色溫。螢光燈會使影像帶有藍色色偏，而鎢絲白熾燈則會使影像帶有黃色色偏。

白平衡功能可讓您透過調整紅色、綠色和藍色的飽和度，來校正這些色偏。因此，在拍攝的影像中，白色物體會呈現白色。

執行白平衡校正#

要執行白平衡校正：

將相機中的 Balance White auto function 設為 Off.
為獲得最佳效果，請將黑電平設定為 0（零）。
將相機中的 BalanceRatioSelector 將參數設定為其中一個可用的色彩通道（Red, Green，或 Blue)。
調整 BalanceRatio 所選色彩通道的參數值：
- 平衡比 = 1：顏色飽和度保持不變。
- 平衡比 > 1：相較於另外兩種顏色，該顏色的飽和度會提高。
- 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.)
- 針對所有可用的色彩通道，重複步驟 3 和 4。

飽和度的增減是成比例的。例如，若某種顏色的平衡比率設定為 1.2，該顏色的飽和度便會增加 20%。

資訊

若將平衡比率設定為小於 1，該顏色的最大飽和度也會隨之降低。除非您想校正某種顏色過於突出的情況，否則不建議將平衡比率設定為小於 1。
某些色彩增強功能，例如： Light Source Preset 或 Color Transformation，也會影響白平衡設定。如有需要，您可以在使用這些功能後手動重新調整白平衡。

外部連結#

範例程式碼#

ace Classic/U/L GigE 相機#

C++ (Native)C++ (Generic)C#C (Generic)Python

// Set the red intensity to 108.789%
camera.BalanceRatioSelector.SetValue(BalanceRatioSelector_Red);
camera.BalanceRatioAbs.SetValue(1.08789);
// Set the green intensity to 100%
camera.BalanceRatioSelector.SetValue(BalanceRatioSelector_Green);
camera.BalanceRatioAbs.SetValue(1.0);
// Set the blue intensity to 219.678%
camera.BalanceRatioSelector.SetValue(BalanceRatioSelector_Blue);
camera.BalanceRatioAbs.SetValue(2.19678);

INodeMap& nodemap = camera.GetNodeMap();
// Set the red intensity to 108.789%
CEnumParameter(nodemap, "BalanceRatioSelector").SetValue("Red");
CFloatParameter(nodemap, "BalanceRatioAbs").SetValue(1.08789);
// Set the green intensity to 100%
CEnumParameter(nodemap, "BalanceRatioSelector").SetValue("Green");
CFloatParameter(nodemap, "BalanceRatioAbs").SetValue(1.0);
// Set the blue intensity to 219.678%
CEnumParameter(nodemap, "BalanceRatioSelector").SetValue("Blue");
CFloatParameter(nodemap, "BalanceRatioAbs").SetValue(2.19678);

// Set the red intensity to 108.789%
camera.Parameters[PLCamera.BalanceRatioSelector].SetValue(PLCamera.BalanceRatioSelector.Red);
camera.Parameters[PLCamera.BalanceRatioAbs].SetValue(1.08789);
// Set the green intensity to 100%
camera.Parameters[PLCamera.BalanceRatioSelector].SetValue(PLCamera.BalanceRatioSelector.Green);
camera.Parameters[PLCamera.BalanceRatioAbs].SetValue(1.0);
// Set the blue intensity to 219.678%
camera.Parameters[PLCamera.BalanceRatioSelector].SetValue(PLCamera.BalanceRatioSelector.Blue);
camera.Parameters[PLCamera.BalanceRatioAbs].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, "BalanceRatioAbs", 1.08789);
CHECK(errRes);
/* Set the green intensity to 100% */
errRes = PylonDeviceFeatureFromString(hdev, "BalanceRatioSelector", "Green");
CHECK(errRes);
errRes = PylonDeviceSetFloatFeature(hdev, "BalanceRatioAbs", 1.0);
CHECK(errRes);
/* Set the blue intensity to 219.678% */
errRes = PylonDeviceFeatureFromString(hdev, "BalanceRatioSelector", "Blue");
CHECK(errRes);
errRes = PylonDeviceSetFloatFeature(hdev, "BalanceRatioAbs", 2.19678);
CHECK(errRes);

# Set the red intensity to 108.789%
camera.BalanceRatioSelector.Value = "Red"
camera.BalanceRatioAbs.Value = 1.08789
# Set the green intensity to 100%
camera.BalanceRatioSelector.Value = "Green"
camera.BalanceRatioAbs.Value = 1.0
# Set the blue intensity to 219.678%
camera.BalanceRatioSelector.Value = "Blue"
camera.BalanceRatioAbs.Value = 2.19678

其他相機#

C++ (Native)C++ (Generic)C#C (Generic)Python

// 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(1.0);
// 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");
CFloatParameter(nodemap, "BalanceRatio").SetValue(1.0);
// 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(1.0);
// 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 = PylonDeviceSetFloatFeature(hdev, "BalanceRatio", 1.0);
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 = 1.0
# Set the blue intensity to 219.678%
camera.BalanceRatioSelector.Value = "Blue"
camera.BalanceRatio.Value = 2.19678

您也可以 use the pylon Viewer 來輕鬆設定參數。