Android Camera2 API设置了自定义亮度,对比度,伽玛

概述由于this尚无明确答案,并且stackoverflow还没有关于Camera2APIGamma的问题/答案,因此我要求提供使用AndroidCamera2API修改Brightness,Contrast和Gamma的解决方案.我的代码获取range和step：RationalcontrolAECompensationStep=characteristics.get(CameraCharacteristic

由于this尚无明确答案,并且stackoverflow还没有关于Camera 2 API Gamma的问题/答案,因此我要求提供使用Android Camera 2 API修改Brightness,Contrast和Gamma的解决方案.
我的代码获取range和step：

Rational controlAECompensationStep = characteristics.get(Cameracharacteristics.CONTRol_AE_COMPENSATION_STEP);if (controlAECompensationStep != null) {    compensationStep = controlAECompensationStep.doubleValue();}Range<Integer> controlAECompensationRange = characteristics.get(Cameracharacteristics.CONTRol_AE_COMPENSATION_RANGE);if (controlAECompensationRange != null) {    minCompensationRange = controlAECompensationRange.getLower();    maxCompensationRange = controlAECompensationRange.getUpper();}

我的以百分比设置亮度的方法：

public voID setBrightness(int value) {    int brightness = (int) (minCompensationRange + (maxCompensationRange - minCompensationRange) * (value / 100f));    prevIEwRequestBuilder.set(CaptureRequest.CONTRol_AE_EXPOSURE_COMPENSATION, brightness);    applySettings();}private voID applySettings() {    try {        captureSession.setRepeatingRequest(prevIEwRequestBuilder.build(), null, null);    } catch (Exception e) {        e.printstacktrace();    }}

但是这种方法无法正常工作.图像变成green,就像here.

我描述了我在documentation中发现的所有内容(包括演示.apk).

解决方法:

我的错误是在修改亮度(B),伽玛(G)或对比度(C)之前将Auto White Balance Mode(AWB)更改为CONTROL_AWB_MODE_OFF.
不要为自动白平衡设定OFF模式,使用auto或其他可能的模式.

获得当前B的百分比

public int getBrightnessValue() {    int absBRange = maxCompensationRange - minCompensationRange;    int value = getValue(CaptureRequest.CONTRol_AE_EXPOSURE_COMPENSATION);    return 100 * (value - minCompensationRange) / absBRange;}

将B设置为百分比

public voID setBrightness(int value) {    int brightness = (int) (minCompensationRange + (maxCompensationRange - minCompensationRange) * (value / 100f));    prevIEwRequestBuilder.set(CaptureRequest.CONTRol_AE_EXPOSURE_COMPENSATION, brightness);    applySettings(); }

将C设置为百分比

//set def channels (used for contrast)TonemapCurve tc = prevIEwRequestBuilder.get(CaptureRequest.TONEMAP_CURVE);if (tc != null) {    channels = new float[3][];    for (int chanel = TonemapCurve.CHANNEL_RED; chanel <= TonemapCurve.CHANNEL_BLUE; chaneL++) {        float[] array = new float[tc.getPointCount(chanel) * 2];        tc.copycolorCurve(chanel, array, 0);        channels[chanel] = array;    }}

public voID setContrast(int value) {    final int minContrast = 0;    final int maxContrast = 1;    if (channels == null || value > 100 || value < 0) {        return;    }    float contrast = minContrast + (maxContrast - minContrast) * (value / 100f);    float[][] newValues = new float[3][];    for (int chanel = TonemapCurve.CHANNEL_RED; chanel <= TonemapCurve.CHANNEL_BLUE; chaneL++) {        float[] array = new float [channels[chanel].length];        System.arraycopy(channels[chanel], 0, array, 0, array.length);        for (int i = 0; i < array.length; i++) {            array[i] *= contrast;        }        newValues[chanel] = array;    }    TonemapCurve tc = new TonemapCurve(newValues[TonemapCurve.CHANNEL_RED], newValues[TonemapCurve.CHANNEL_GREEN], newValues[TonemapCurve.CHANNEL_BLUE]);    prevIEwRequestBuilder.set(CaptureRequest.TONEMAP_MODE, CaptureRequest.TONEMAP_MODE_CONTRAST_CURVE);    prevIEwRequestBuilder.set(CaptureRequest.TONEMAP_CURVE, tc);    applySettings();}

private voID applySettings() {    captureSession.setRepeatingRequest(prevIEwRequestBuilder.build(), null, null);}

G仍在进行中.

上面的代码示例可能不是100％正确,如果您有更好的解决方案或发现了错误,请告诉我;)

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