android camera尺寸,Android camera2传感器尺寸的CameraCharacteristics API的可靠性如何？

在我上的银河S7尝试：

给定的传感器尺寸被3.2毫米X2.4毫米(使用SENSOR_INFO_PHYSICAL_SIZE)。

在这种情况下，我的计算HFOV是41.7°(给出的焦距是4.2mm)，我通过实验证明是错误的。

各种规格文档提及了1/2.5" 传感器尺寸(5.76毫米X根据wikipedia4.29毫米) - 这将给我一个HFOV的68.9°，更接近我实验

在CameraCharacteristics的值似乎错误。

在三星Galaxy A3-2016相同的查询和实验是更确凿的，计算出HFOV似乎相匹配的实验之一。

有没有人的经验或数据共享有关的CameraCharacteristics读数的可靠性？

的代码，我习惯了这里查询CameraCharacteristics ::

CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraID);

if (characteristics.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_FRONT)

continue;

int support = characteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);

if(support == CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY)

Log.d("mr", "Camera " + cameraID + " has LEGACY Camera2 support");

else if(support == CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED)

Log.d("mr", "Camera " + cameraID + " has LIMITED Camera2 support");

else if(support == CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_FULL)

Log.d("mr", "Camera " + cameraID + " has FULL Camera2 support");

else

Log.d("mr", "Camera " + cameraID + " has unknown Camera2 support?!");

// voir http://myandroidarchive.tistory.com/5 pour le query android

// voir http://paulbourke.net/miscellaneous/lens/ pour les maths

// include every focal length supported by the camera device, in ascending order.

float[] focalLengths = characteristics.get(CameraCharacteristics.LENS_INFO_AVAILABLE_FOCAL_LENGTHS);

SizeF sensorSize = characteristics.get(CameraCharacteristics.SENSOR_INFO_PHYSICAL_SIZE);

float w = 0.5f * sensorSize.getWidth();

float h = 0.5f * sensorSize.getHeight();

Log.d("mr", "Camera " + cameraID + " has sensorSize == " + Float.toString(2.0f*w) + ", " + Float.toString(2.0f*h));

for (int focusId=0; focusId

float focalLength = focalLengths[focusId];

float horizonalAngle = (float) Math.toDegrees(2 * Math.atan(w/focalLength));

float verticalAngle = (float) Math.toDegrees(2 * Math.atan(h/focalLength));

Log.d("mr", "Camera " + cameraID + "/f" + focusId + " has focalLength == " + Float.toString(focalLength));

Log.d("mr", " * horizonalAngle == " + Float.toString(horizonalAngle));

Log.d("mr", " * verticalAngle == " + Float.toString(verticalAngle));

}

2016-11-09

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