谷歌Android 4.3/4.4的PhotoSphere背后的算法

Question

谷歌Android 4.3/4.4的PhotoSphere背后的算法

algorithmpanoramasimage-stitchingphotosphere

23

Android 4.3/4.4的相机应用程序在“全景模式”下可以将来自不同方向的照片拼接成一个非常优质的球形全景图。

结果展示:

我要做的是为iPad实现完全相同功能的应用程序。

我尝试了两种方法:

OpenCV 2.4.8

OpenCV 2.4.8提供了一个图像拼接流程，乍一看似乎很有前途。但是，它有两个问题：

该流程处理无序输入照片，据我所知，它仅使用图像特征匹配来定位照片之间的几何关系，并且当图像特征提取失败时（例如：白色墙壁，蓝天），该流程表现不佳。然而，iPad可以提供每个拍摄照片的任意空间方向数据（虽然有噪声），但我不知道如何在OpenCV拼接流程中利用这些数据。
我找不到一种方法来生成像PhotoSphere一样的180x360度全景图。使用所有方向的照片输入该流程只会产生带有弯曲图像边界的大型全景图。

PanoTools

我也尝试过PanoTools/Hugin库，虽然该库支持预定义的照片方向，但结果相当差且不稳定。此外，我尝试使用Focal(beta)应用程序在Google Play上，它的球形模式也基于PanoTools/Hugin，他们的结果（在球形模式下）似乎并不比我们的好。

我的问题：

是否有可以完成Google PhotoSphere相同功能的库？由于我不是为商业用途开发，因此任何开源库都可以接受。
是否有可用的良好算法（或技术报告、学者论文）？如果有，哪个是最好的？
Google如何实现他们自己的PhotoSphere？有什么建议？

- yang.gnay

嗨，我正在寻找同样的问题。你有任何进展吗？ - rodripf

你找到处理光球照片的东西了吗？ - klimat

1

这里有一个给你的库：https://github.com/robbykraft/Panorama - Bart Burg

我使用Google相机时经常得到非常不稳定的结果，几乎总是有一些帧非常错位。我不认为它有什么独特的算法，尽管它有良好的UI，可以使用加速度计和指南针来确定何时拍照以及显示球形覆盖范围。 - kolen

有人找到解决办法了吗？ - Nominalista

2个回答

-3

你可以在这里查看Google相机应用的源代码：

https://android.googlesource.com/platform/packages/apps/Camera/+refs

- hfatih

抱歉，出了点问题。现在已经修复了。 - hfatih

好的，找到了，现在正在查看内部，谢谢！链接 - yang.gnay

5

这是一款没有Photo Sphere功能的不同相机应用程序。 - fhucho

6

此相机不包括照片球源代码。 - PerracoLabs

有人有安卓照片球的源代码吗？ - Mr.G

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Dev-iL · Accepted Answer

我认为这个答案不是解决方案，而是进一步研究的资源。

为了对这个功能所涉及的算法有一个非常普遍的了解，我们可以研究负责此功能的共享对象（如果您喜欢Windows术语，则为DLL）。通过列出函数名称并在我们喜爱的搜索引擎中查找它们，我们可以得到几个有趣的结果：

存储库中的相关源文件，在先前的答案中提到。特别是请参阅{{link3：Mosaic.h}}
受此代码启发的其他项目，例如Mozilla的PanoramaCameraDesign。

本文的读者被鼓励查看下面的函数列表，并了解所提到的各种算法和转换。

以下是我获取此列表所遵循的步骤：

我找到了相机应用程序的一个端口到三星 [src]。
在归档文件中，我注意到一个名为 libjni_mosaic.so 的文件，它（根据我的猜测）负责马赛克拼接（“照片球”）。
我列出了此文件中的函数（使用来自 Android NDK 的 nm 或 llvm_objdump；更多信息）：

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0002be8d T db_StabilizationSmoother::is_point_in_rect(double, double, double, double, double, double)
0002b8b1 T db_StabilizationSmoother::smoothMotionAdaptive(int, int, VP_MOTION*, VP_MOTION*)
0002aa45 T db_StabilizationSmoother::Init()
0002b4e5 T db_StabilizationSmoother::db_StabilizationSmoother()
0002b4e5 T db_StabilizationSmoother::db_StabilizationSmoother()
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0000ecb9 T db_StabilizationSmoother::~db_StabilizationSmoother()
0002a1d9 T db_FrameToReferenceRegistration::SmoothMotion()
00029c89 T db_FrameToReferenceRegistration::ComputeInliers(double*)
00029f09 T db_FrameToReferenceRegistration::SelectOutliers()
0002a479 T db_FrameToReferenceRegistration::UpdateReference(unsigned char const* const*, bool, bool)
00029efd T db_FrameToReferenceRegistration::ComputeCostArray()
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000298d1 T db_FrameToReferenceRegistration::Get_H_dref_to_ref(double*)
00029a89 T db_FrameToReferenceRegistration::Set_H_dref_to_ins(double*)
00029c51 T db_FrameToReferenceRegistration::NeedReferenceUpdate()
0002a141 T db_FrameToReferenceRegistration::SetOutlierThreshold()
0002a071 T db_FrameToReferenceRegistration::ComputeCostHistogram()
00029c19 T db_FrameToReferenceRegistration::ResetDisplayReference()
00029f9d T db_FrameToReferenceRegistration::EstimateSecondaryModel(double*)
0002a379 T db_FrameToReferenceRegistration::GenerateQuarterResImage(unsigned char const* const*)
00029669 T db_FrameToReferenceRegistration::Init(int, int, int, int, bool, bool, double, unsigned int, bool, double, int, int, int, double, bool, int, int)
00029539 T db_FrameToReferenceRegistration::Clean()
00029ce5 T db_FrameToReferenceRegistration::Polish(int*, int&)
0002a62d T db_FrameToReferenceRegistration::AddFrame(unsigned char const* const*, double*, bool, bool)
00029425 T db_FrameToReferenceRegistration::db_FrameToReferenceRegistration()
00029425 T db_FrameToReferenceRegistration::db_FrameToReferenceRegistration()
00029641 T db_FrameToReferenceRegistration::~db_FrameToReferenceRegistration()
00029641 T db_FrameToReferenceRegistration::~db_FrameToReferenceRegistration()
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0000a611 T Align::getRegProfileString()
0000a7b1 T Align::addFrame(unsigned char*)
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0000a545 T Align::Align()
0000a5f9 T Align::~Align()
0000a5f9 T Align::~Align()
0000ac6d T Blend::initialize(int, int, int, int)
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0000c429 T Blend::ClipBlendRect(CSite*, BlendRect&)
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0000b54d T Blend::MosaicToFrame(double (*) [3], double, double, double&, double&)
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0000ad71 T Blend::MosaicSizeCheck(float, float)
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0000affd T Blend::PerformFinalBlending(YUVinfo&, MosaicRect&)
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0000e181 T Blend::ComputeBlendParameters(MosaicFrame**, int, int)
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0000b2dd T Blend::RoundingCroppingSizeToMultipleOf8(MosaicRect&)
0000ce01 T Blend::runBlend(MosaicFrame**, MosaicFrame**, int, unsigned char*&, int&, int&, float&, bool&)
0000ac2d T Blend::Blend()
0000ac2d T Blend::Blend()
0000ac45 T Blend::~Blend()
0000ac45 T Blend::~Blend()
000107a1 T Mosaic::initialize(int, int, int, int, int, bool, float)
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00010ac1 T Mosaic::createMosaic(float&, bool&)
000109f1 T Mosaic::balanceRotations()
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000109d9 T Mosaic::getMosaic(int&, int&)
000106e9 T Mosaic::Mosaic()
000106e9 T Mosaic::Mosaic()
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00010721 T Mosaic::~Mosaic()
000105e5 T YUVinfo::allocateImage(unsigned short, unsigned short)
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000115fd T Renderer::loadShader(unsigned int, char const*)
00011691 T Renderer::createProgram(char const*, char const*)
00011791 T Renderer::SetupGraphics(int, int)
000117fd T Renderer::SetupGraphics(FrameBuffer*)
000118d5 T Renderer::GetTextureName()
000118b1 T Renderer::InitializeGLContext()
000118d9 T Renderer::SetInputTextureName(unsigned int)
000118dd T Renderer::SetInputTextureType(unsigned int)
000118e1 T Renderer::SetInputTextureDimensions(int, int)
00011879 T Renderer::Clear(float, float, float, float)
000115b9 T Renderer::Renderer()
000115b9 T Renderer::Renderer()
000115a1 T Renderer::~Renderer()
00011591 T Renderer::~Renderer()
00011591 T Renderer::~Renderer()
0000ee45 T CDelaunay::deleteEdge(short)
0000eef9 T CDelaunay::freeMemory()
0000eec1 T CDelaunay::allocMemory(int)
0000ed81 T CDelaunay::connectLeft(short, short)
0000fd59 T CDelaunay::triangulate(SEdgeVector**, int, int, int)
0000ede5 T CDelaunay::connectRight(short, short)
0000fc41 T CDelaunay::constructList(short, int, int)
0000fd91 T CDelaunay::linkNeighbors(SEdgeVector*, int, int)
0000ef0d T CDelaunay::deleteAllEdges()
0000ef49 T CDelaunay::consolidateEdges()
0000faf1 T CDelaunay::buildTriangulation(int)
0000f4d9 T CDelaunay::ccw(short, short, short)
0000f8cd T CDelaunay::build(int, int, short*, short*, int)
0000e771 T CDelaunay::cmpev(int, int)
0000e7e9 T CDelaunay::copyev(int, int)
0000e7fd T CDelaunay::copysp(int, int)
0000ed2d T CDelaunay::splice(short, short)
0000e7c1 T CDelaunay::swapev(int, int)
0000e781 T CDelaunay::swapsp(int, int)
0000e8b1 T CDelaunay::xcmpsp(int, int)
0000e825 T CDelaunay::ycmpsp(int, int)
0000f529 T CDelaunay::doMerge(short*, short, short, short*)
0000f0fd T CDelaunay::rcssort(int, int, int, int (CDelaunay::*)(int, int), void (CDelaunay::*)(int, int), void (CDelaunay::*)(int, int))
0000f035 T CDelaunay::spsortx(short*, int, int)
0000f099 T CDelaunay::spsorty(short*, int, int)
0000ef39 T CDelaunay::freeEdge(short)
0000f439 T CDelaunay::incircle(short, short, short, short)
0000ecbd T CDelaunay::makeEdge(short, short)
0000ef19 T CDelaunay::allocEdge()
0000ecb9 T CDelaunay::CDelaunay()
0000ecb9 T CDelaunay::CDelaunay()
0000ecb9 T CDelaunay::~CDelaunay()
0000ecb9 T CDelaunay::~CDelaunay()
         U operator new[](unsigned int)
000118d5 T FrameBuffer::GetTextureName() const
00012411 T FrameBuffer::GetFrameBufferName() const
00012419 T FrameBuffer::GetWidth() const
00012415 T FrameBuffer::GetFormat() const
0001241d T FrameBuffer::GetHeight() const
0001201d T YVURenderer::VertexShaderSource() const
00012029 T YVURenderer::FragmentShaderSource() const
000118f5 T WarpRenderer::VertexShaderSource() const
00011901 T WarpRenderer::FragmentShaderSource() const
00015971 T db_CornerDetector_f::DetectCorners(float const* const*, double*, double*, int*) const
00012cc5 T db_CornerDetector_u::DetectCorners(unsigned char const* const*, double*, double*, int*, unsigned char const* const*, unsigned char) const
00011c85 T SurfaceTextureRenderer::VertexShaderSource() const
00011c91 T SurfaceTextureRenderer::FragmentShaderSource() const
         U operator new(unsigned int)
00030d30 D vtable for FrameBuffer
00030d10 D vtable for YVURenderer
00030d68 D vtable for db_Matcher_u
00030cd0 D vtable for WarpRenderer
00030d40 D vtable for db_CornerDetector_u
00030cf0 D vtable for SurfaceTextureRenderer
00030cb0 D vtable for Renderer