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

Question

我正在尝试使用 camera2 API 我底部的代码 get/compute 设备摄像头的 FOV。

关于我对 Galaxy S7 的尝试：

给定的传感器尺寸为 3.2mm x 2.4mm（使用 SENSOR_INFO_PHYSICAL_SIZE）。
在这种情况下，我计算出的HFOV是41.7°（给定的焦距是4.2mm），我通过实验证明是错误的。
各种规格文档提到 1/2.5" 传感器尺寸（根据 wikipedia 为 5.76mm x 4.29mm）- 这将使我的 HFOV 为 68.9°，更接近我的实验。
CameraCharacteristics 中的值似乎有误。

在 Samsung Galaxy A3-2016 上进行相同的查询和实验更有说服力，计算出的 HFOV 似乎与实验相符。

关于 CameraCharacteristics 读数的可靠性，有没有人可以分享经验或数据？

我用来查询的代码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<focalLengths.length; 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));
}

Answer 1

这里是 Scanbot 的开发者（又名我用相机工作够了）。

根据我的经验，关于相机 API 的任何内容都不可靠，主要是因为此 API 是硬件和供应商特定相机驱动程序上的一个相对较薄的层。换句话说，API 的输出将取决于供应商决定放在那里的内容，而不是由 Google.

管理的（与 Android SDK 的其余部分不同）。

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

How reliable is Android camera2 CameraCharacteristics API for sensor size?

android

android-sensors

android-camera2