Android中的光流量

Question

我們一直在處理OpenCV兩週，使其在Android上運行。 您知道我們在哪裏可以找到Android光流實施？如果使用OpenCV實現它將會很好。

Answer 1

，你可以在這裏找到一個實現： http://www.cs.cornell.edu/courses/cs4670/2010fa/projects/final/results/group_of_acc269_ty244_yc563/cs4670_final.html

最好 -Ali

Answer 2

試試這個

@覆蓋 公共墊onCameraFrame（CvCameraViewFrame inputFrame）{

mRgba = inputFrame.rgba(); 
    if (mMOP2fptsPrev.rows() == 0) { 

     //Log.d("Baz", "First time opflow"); 
     // first time through the loop so we need prev and this mats 
     // plus prev points 
     // get this mat 
     Imgproc.cvtColor(mRgba, matOpFlowThis, Imgproc.COLOR_RGBA2GRAY); 

     // copy that to prev mat 
     matOpFlowThis.copyTo(matOpFlowPrev); 

     // get prev corners 
     Imgproc.goodFeaturesToTrack(matOpFlowPrev, MOPcorners, iGFFTMax, 0.05, 20); 
     mMOP2fptsPrev.fromArray(MOPcorners.toArray()); 

     // get safe copy of this corners 
     mMOP2fptsPrev.copyTo(mMOP2fptsSafe); 
     } 
    else 
     { 
     //Log.d("Baz", "Opflow"); 
     // we've been through before so 
     // this mat is valid. Copy it to prev mat 
     matOpFlowThis.copyTo(matOpFlowPrev); 

     // get this mat 
     Imgproc.cvtColor(mRgba, matOpFlowThis, Imgproc.COLOR_RGBA2GRAY); 

     // get the corners for this mat 
     Imgproc.goodFeaturesToTrack(matOpFlowThis, MOPcorners, iGFFTMax, 0.05, 20); 
     mMOP2fptsThis.fromArray(MOPcorners.toArray()); 

     // retrieve the corners from the prev mat 
     // (saves calculating them again) 
     mMOP2fptsSafe.copyTo(mMOP2fptsPrev); 

     // and save this corners for next time through 

     mMOP2fptsThis.copyTo(mMOP2fptsSafe); 
     } 


    /* 
    Parameters: 
     prevImg first 8-bit input image 
     nextImg second input image 
     prevPts vector of 2D points for which the flow needs to be found; point coordinates must be single-precision floating-point numbers. 
     nextPts output vector of 2D points (with single-precision floating-point coordinates) containing the calculated new positions of input features in the second image; when OPTFLOW_USE_INITIAL_FLOW flag is passed, the vector must have the same size as in the input. 
     status output status vector (of unsigned chars); each element of the vector is set to 1 if the flow for the corresponding features has been found, otherwise, it is set to 0. 
     err output vector of errors; each element of the vector is set to an error for the corresponding feature, type of the error measure can be set in flags parameter; if the flow wasn't found then the error is not defined (use the status parameter to find such cases). 
    */ 
    Video.calcOpticalFlowPyrLK(matOpFlowPrev, matOpFlowThis, mMOP2fptsPrev, mMOP2fptsThis, mMOBStatus, mMOFerr); 

    cornersPrev = mMOP2fptsPrev.toList(); 
    cornersThis = mMOP2fptsThis.toList(); 
    byteStatus = mMOBStatus.toList(); 

    y = byteStatus.size() - 1; 

    for (x = 0; x < y; x++) { 
     if (byteStatus.get(x) == 1) { 
      pt = cornersThis.get(x); 
      pt2 = cornersPrev.get(x); 


      Core.circle(mRgba, pt, 5, colorRed, iLineThickness - 1); 

      Core.line(mRgba, pt, pt2, colorRed, iLineThickness); 
      } 
     } 

return mRgba; 

    } 

Answer 3

了openFrameworks已經在openCV中出爐了，還有很多其他的有趣的庫。它有一個非常優雅的結構，我已經用它與android使用相機的運動估計來製作手機的虛擬鼠標。

查看端口這裏http://openframeworks.cc/setup/android-studio/

看來Android他們最近增加了對Android的支持工作室，否則蝕偉大的作品。