Gain Auto#

Gain Auto camera feature 會在指定的限制範圍內自動調整 gain，直到達到目標亮度值。

自動功能的像素資料可以來自一個或多個 auto function ROIs。

如果您想同時使用 Gain Auto 和 Exposure Auto，請使用 Auto Function Profile 功能來指定兩者效果如何平衡。

若要手動調整 gain，請使用 Gain 功能。

使用此功能#

啟用或停用 Gain Auto#

若要啟用或停用 Gain Auto 自動功能：

指派至少一個 auto function ROI 至 Gain Auto 自動功能。
確保 auto function ROI 與 image ROI 部分或完全重疊。
將 GainAuto 參數設定為以下其中一種 Operating Mode：
- Once：相機調整 gain，直到指定的目標亮度值已達到。當達成此目標，或在最多 30 個計算週期之後，相機將自動功能設為 [Off`，並將最後一次計算產生的 gain 套用到所有後續影像。
- Continuous：在擷取影像時，相機會持續調整 gain。
- Off：停用 Gain Auto 自動功能。Gain 將維持上次自動或手動調整所產生的數值。

資訊

當相機持續擷取影像時，自動功能會略有延遲地生效。前幾張影像可能不會受到自動功能的影響。

指定上下限#

自動功能會在指定的限制內調整 Gain 參數值在您指定的限制內。

若要變更限制，請將 AutoGainLowerLimit 會設為 AutoGainUpperLimit 參數設定為所需的值。

範例： 假設您已將 AutoGainLowerLimit 參數設為 2，且將 AutoGainUpperLimit 參數設為 6。在自動調整過程中，gain 絕不會低於 2 且絕不會高於 6。

指定目標亮度值#

自動功能會調整 gain，直到達到目標亮度值（即平均灰階值）。

若要指定目標值，請使用 AutoTargetBrightness 參數的值。

資訊

目標值的計算不包含其他影像優化，例如 Gamma。根據所設定的影像優化，相機輸出的影像其平均灰階值可能會顯著低於或高於目標值所指示的數值。
相機同時也會使用 AutoTargetBrightness 參數來控制 Exposure Auto 自動功能。如果您想同時使用 Gain Auto 和 Exposure Auto ，請使用 Auto Function Profile 功能來指定如何平衡兩者的效果。
對於配備 CXP 介面的 racer 2 S 線形掃描相機，以下條件適用：
用於產生目標亮度值的演算法是在「相機端」套用，因此僅套用於單行，而非完整畫面。完整畫面是在擷取卡中建立，其中隨機選取的行（帶有套用的目標亮度值）會成為組合畫面的一部分。
在某些相機型號上，您可以使用 Remove Parameter Limits 功能來提高目標值參數限制。

在 Basler ace GigE 相機型號上，您也可以指定 Gray Value Adjustment Damping 係數。在 Basler dart 和 pulse 相機型號上，您可以指定 Brightness Adjustment Damping 係數。

當使用阻尼係數時，達到目標值的速度會比較慢。

範例程式碼#

ace Classic/U/L GigE 相機#

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

// Set the the Gain Auto auto function to its minimum lower limit
// and its maximum upper limit
double minLowerLimit = camera.AutoGainRawLowerLimit.GetMin();
double maxUpperLimit = camera.AutoGainRawUpperLimit.GetMax();
camera.AutoGainRawLowerLimit.SetValue(minLowerLimit);
camera.AutoGainRawUpperLimit.SetValue(maxUpperLimit);
// Specify the target value
camera.AutoTargetValue.SetValue(150);
// Select auto function ROI 1
camera.AutoFunctionAOISelector.SetValue(AutoFunctionAOISelector_AOI1);
// Enable the 'Intensity' auto function (Gain Auto + Exposure Auto)
// for the auto function ROI selected
camera.AutoFunctionAOIUsageIntensity.SetValue(true);
// Enable Gain Auto by setting the operating mode to Continuous
camera.GainAuto.SetValue(GainAuto_Continuous);

INodeMap& nodemap = camera.GetNodeMap();
// Set the the Gain Auto auto function to its minimum lower limit
// and its maximum upper limit
double minLowerLimit = CFloatParameter(nodemap, "AutoGainRawLowerLimit").GetMin();
double maxUpperLimit = CFloatParameter(nodemap, "AutoGainRawUpperLimit").GetMax();
CFloatParameter(nodemap, "AutoGainRawLowerLimit").SetValue(minLowerLimit);
CFloatParameter(nodemap, "AutoGainRawUpperLimit").SetValue(maxUpperLimit);
// Specify the target value
CIntegerParameter(nodemap, "AutoTargetValue").SetValue(150);
// Select auto function ROI 1
CEnumParameter(nodemap, "AutoFunctionAOISelector").SetValue("AOI1");
// Enable the 'Intensity' auto function (Gain Auto + Exposure Auto)
// for the auto function ROI selected
CBooleanParameter(nodemap, "AutoFunctionAOIUsageIntensity").SetValue(true);
// Enable Gain Auto by setting the operating mode to Continuous
CEnumParameter(nodemap, "GainAuto").SetValue("Continuous");

// Set the the Gain Auto auto function to its minimum lower limit
// and its maximum upper limit
double minLowerLimit = camera.Parameters[PLCamera.AutoGainRawLowerLimit].GetMinimum();
double maxUpperLimit = camera.Parameters[PLCamera.AutoGainRawUpperLimit].GetMaximum();
camera.Parameters[PLCamera.AutoGainRawLowerLimit].SetValue(minLowerLimit);
camera.Parameters[PLCamera.AutoGainRawUpperLimit].SetValue(maxUpperLimit);
// Specify the target value
camera.Parameters[PLCamera.AutoTargetValue].SetValue(150);
// Select auto function ROI 1
camera.Parameters[PLCamera.AutoFunctionAOISelector].SetValue(PLCamera.AutoFunctionAOISelector.AOI1);
// Enable the 'Intensity' auto function (Gain Auto + Exposure Auto)
// for the auto function ROI selected
camera.Parameters[PLCamera.AutoFunctionAOIUsageIntensity].SetValue(true);
// Enable Gain Auto by setting the operating mode to Continuous
camera.Parameters[PLCamera.GainAuto].SetValue(PLCamera.GainAuto.Continuous);

/* 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 */
double minLowerLimit = 0;
double maxUpperLimit = 0;
/* Set the the Gain Auto auto function to its minimum lower limit */
/* and its maximum upper limit */
errRes = PylonDeviceGetFloatFeatureMin(hdev, "AutoGainRawLowerLimit", &minLowerLimit);
CHECK(errRes);
errRes = PylonDeviceGetFloatFeatureMax(hdev, "AutoGainRawUpperLimit", &maxUpperLimit);
CHECK(errRes);
errRes = PylonDeviceSetFloatFeature(hdev, "AutoGainRawLowerLimit", minLowerLimit);
CHECK(errRes);
errRes = PylonDeviceSetFloatFeature(hdev, "AutoGainRawUpperLimit", maxUpperLimit);
CHECK(errRes);
/* Specify the target value */
errRes = PylonDeviceSetIntegerFeature(hdev, "AutoTargetValue", 150);
CHECK(errRes);
/* Select auto function ROI 1 */
errRes = PylonDeviceFeatureFromString(hdev, "AutoFunctionAOISelector", "AOI1");
CHECK(errRes);
/* Enable the 'Intensity' auto function (Gain Auto + Exposure Auto) */
/* for the auto function ROI selected */
errRes = PylonDeviceSetBooleanFeature(hdev, "AutoFunctionAOIUsageIntensity", 1);
CHECK(errRes);
/* Enable Gain Auto by setting the operating mode to Continuous */
errRes = PylonDeviceFeatureFromString(hdev, "GainAuto", "Continuous");
CHECK(errRes);

# Set the the Gain Auto auto function to its minimum lower limit
# and its maximum upper limit
minLowerLimit = camera.AutoGainRawLowerLimit.Min
maxUpperLimit = camera.AutoGainRawUpperLimit.Max
camera.AutoGainRawLowerLimit.Value = minLowerLimit
camera.AutoGainRawUpperLimit.Value = maxUpperLimit
# Specify the target value
camera.AutoTargetValue.Value = 150
# Select auto function ROI 1
camera.AutoFunctionAOISelector.Value = "AOI1"
# Enable the 'Intensity' auto function (Gain Auto + Exposure Auto)
# for the auto function ROI selected
camera.AutoFunctionAOIUsageIntensity.Value = True
# Enable Gain Auto by setting the operating mode to Continuous
camera.GainAuto.Value = "Continuous"

其他相機#

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

// Set the the Gain Auto auto function to its minimum lower limit
// and its maximum upper limit
double minLowerLimit = camera.AutoGainLowerLimit.GetMin();
double maxUpperLimit = camera.AutoGainUpperLimit.GetMax();
camera.AutoGainLowerLimit.SetValue(minLowerLimit);
camera.AutoGainUpperLimit.SetValue(maxUpperLimit);
// Specify the target value
camera.AutoTargetBrightness.SetValue(0.6);
// Select auto function ROI 1
camera.AutoFunctionROISelector.SetValue(AutoFunctionROISelector_ROI1);
// Enable the 'Brightness' auto function (Gain Auto + Exposure Auto)
// for the auto function ROI selected
camera.AutoFunctionROIUseBrightness.SetValue(true);
// Enable Gain Auto by setting the operating mode to Continuous
camera.GainAuto.SetValue(GainAuto_Continuous);

INodeMap& nodemap = camera.GetNodeMap();
// Set the the Gain Auto auto function to its minimum lower limit
// and its maximum upper limit
double minLowerLimit = CFloatParameter(nodemap, "AutoGainLowerLimit").GetMin();
double maxUpperLimit = CFloatParameter(nodemap, "AutoGainUpperLimit").GetMax();
CFloatParameter(nodemap, "AutoGainLowerLimit").SetValue(minLowerLimit);
CFloatParameter(nodemap, "AutoGainUpperLimit").SetValue(maxUpperLimit);
// Specify the target value
CFloatParameter(nodemap, "AutoTargetBrightness").SetValue(0.6);
// Select auto function ROI 1
CEnumParameter(nodemap, "AutoFunctionROISelector").SetValue("ROI1");
// Enable the 'Brightness' auto function (Gain Auto + Exposure Auto)
// for the auto function ROI selected
CBooleanParameter(nodemap, "AutoFunctionROIUseBrightness").SetValue(true);
// Enable Gain Auto by setting the operating mode to Continuous
CEnumParameter(nodemap, "GainAuto").SetValue("Continuous");

// Set the the Gain Auto auto function to its minimum lower limit
// and its maximum upper limit
double minLowerLimit = camera.Parameters[PLCamera.AutoGainLowerLimit].GetMinimum();
double maxUpperLimit = camera.Parameters[PLCamera.AutoGainUpperLimit].GetMaximum();
camera.Parameters[PLCamera.AutoGainLowerLimit].SetValue(minLowerLimit);
camera.Parameters[PLCamera.AutoGainUpperLimit].SetValue(maxUpperLimit);
// Specify the target value
camera.Parameters[PLCamera.AutoTargetBrightness].SetValue(0.6);
// Select auto function ROI 1
camera.Parameters[PLCamera.AutoFunctionROISelector].SetValue(PLCamera.AutoFunctionROISelector.ROI1);
// Enable the 'Brightness' auto function (Gain Auto + Exposure Auto)
// for the auto function ROI selected
camera.Parameters[PLCamera.AutoFunctionROIUseBrightness].SetValue(true);
// Enable Gain Auto by setting the operating mode to Continuous
camera.Parameters[PLCamera.GainAuto].SetValue(PLCamera.GainAuto.Continuous);

/* 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 */
double minLowerLimit = 0;
double maxUpperLimit = 0;
/* Set the the Gain Auto auto function to its minimum lower limit */
/* and its maximum upper limit */
errRes = PylonDeviceGetFloatFeatureMin(hdev, "AutoGainLowerLimit", &minLowerLimit);
CHECK(errRes);
errRes = PylonDeviceGetFloatFeatureMax(hdev, "AutoGainUpperLimit", &maxUpperLimit);
CHECK(errRes);
errRes = PylonDeviceSetFloatFeature(hdev, "AutoGainLowerLimit", minLowerLimit);
CHECK(errRes);
errRes = PylonDeviceSetFloatFeature(hdev, "AutoGainUpperLimit", maxUpperLimit);
CHECK(errRes);
/* Specify the target value */
errRes = PylonDeviceSetFloatFeature(hdev, "AutoTargetBrightness", 0.6);
CHECK(errRes);
/* Select auto function ROI 1 */
errRes = PylonDeviceFeatureFromString(hdev, "AutoFunctionROISelector", "ROI1");
CHECK(errRes);
/* Enable the 'Brightness' auto function (Gain Auto + Exposure Auto) */
/* for the auto function ROI selected */
errRes = PylonDeviceSetBooleanFeature(hdev, "AutoFunctionROIUseBrightness", 1);
CHECK(errRes);
/* Enable Gain Auto by setting the operating mode to Continuous */
errRes = PylonDeviceFeatureFromString(hdev, "GainAuto", "Continuous");
CHECK(errRes);

# Set the the Gain Auto auto function to its minimum lower limit
# and its maximum upper limit
minLowerLimit = camera.AutoGainLowerLimit.Min
maxUpperLimit = camera.AutoGainUpperLimit.Max
camera.AutoGainLowerLimit.Value = minLowerLimit
camera.AutoGainUpperLimit.Value = maxUpperLimit
# Specify the target value
camera.AutoTargetBrightness.Value = 0.6
# Select auto function ROI 1
camera.AutoFunctionROISelector.Value = "ROI1"
# Enable the 'Brightness' auto function (Gain Auto + Exposure Auto)
# for the auto function ROI selected
camera.AutoFunctionROIUseBrightness.Value = True
# Enable Gain Auto by setting the operating mode to Continuous
camera.GainAuto.Value = "Continuous"

您也可以使用 pylon Viewer 來輕鬆設定參數。