【发布时间】：2012-03-15 03:36:05
【问题描述】：
所以我有代码可以在任何给定的图像文件中检测多达 10 个面孔，并将眼睛的位置和其他类似信息返回给我。因此，当我告诉它为我的项目使用存储在资源的可绘制文件夹中的图像文件时，它工作得很好。但是当我尝试从我从 sd 卡导入的位图中查找面孔时，它不会找到任何面孔。但这些是完全相同的图像。有任何想法吗？我的代码如下：
编辑：
经过进一步检查，我发现当我插入这行代码System.out.println("Row Bytes: " + sourceImage.getRowBytes());
我得到drawable是352，SD卡图像是704。我认为这意味着drawable在.apk文件中被压缩，但SD卡图像显然不是。不确定这是否会产生任何影响。
public class FaceView extends View {
private static final int NUM_FACES = 10; // max is 64
private static final boolean DEBUG = true;
private FaceDetector arrayFaces;
private FaceDetector.Face getAllFaces[] = new FaceDetector.Face[NUM_FACES];
private FaceDetector.Face getFace = null;
private PointF eyesMidPts[] = new PointF[NUM_FACES];
private float eyesDistance[] = new float[NUM_FACES];
private Bitmap sourceImage;
private Paint tmpPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint pOuterBullsEye = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint pInnerBullsEye = new Paint(Paint.ANTI_ALIAS_FLAG);
private int picWidth, picHeight;
private float xRatio, yRatio;
public FaceView(Context context) {
super(context);
pInnerBullsEye.setStyle(Paint.Style.FILL);
pInnerBullsEye.setColor(Color.RED);
pOuterBullsEye.setStyle(Paint.Style.STROKE);
pOuterBullsEye.setColor(Color.RED);
tmpPaint.setStyle(Paint.Style.STROKE);
tmpPaint.setTextAlign(Paint.Align.CENTER);
BitmapFactory.Options bfo = new BitmapFactory.Options();
bfo.inPreferredConfig = Bitmap.Config.RGB_565;
//********This code imports the image from the SD card which does not work
String imageInSD = Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/testfolder/" + "face1" + ".png";
Bitmap sourceImage = BitmapFactory.decodeFile(imageInSD,bfo);
//**********This code uses an image in the projects drawable folder, this code works.
sourceImage = BitmapFactory.decodeResource( getResources() ,R.drawable.face1, bfo);
picWidth = sourceImage.getWidth();
picHeight = sourceImage.getHeight();
arrayFaces = new FaceDetector( picWidth, picHeight, NUM_FACES );
arrayFaces.findFaces(sourceImage, getAllFaces);
for (int i = 0; i < getAllFaces.length; i++)
{
getFace = getAllFaces[i];
try {
PointF eyesMP = new PointF();
getFace.getMidPoint(eyesMP);
eyesDistance[i] = getFace.eyesDistance();
eyesMidPts[i] = eyesMP;
if (DEBUG)
{
Log.i("Face",
i + " " + getFace.confidence() + " " + getFace.eyesDistance() + " "
+ "Pose: ("+ getFace.pose(FaceDetector.Face.EULER_X) + ","
+ getFace.pose(FaceDetector.Face.EULER_Y) + ","
+ getFace.pose(FaceDetector.Face.EULER_Z) + ")"
+ "Eyes Midpoint: ("+eyesMidPts[i].x + "," + eyesMidPts[i].y +")"
);
}
}
catch (Exception e)
{
if (DEBUG) Log.e("Face", i + " is null");
}
}
}
@Override
protected void onDraw(Canvas canvas)
{
xRatio = getWidth()*1.0f / picWidth;
yRatio = getHeight()*1.0f / picHeight;
canvas.drawBitmap( sourceImage, null , new Rect(0,0,getWidth(),getHeight()),tmpPaint);
for (int i = 0; i < eyesMidPts.length; i++)
{
if (eyesMidPts[i] != null)
{
pOuterBullsEye.setStrokeWidth(eyesDistance[i] /6);
canvas.drawCircle(eyesMidPts[i].x*xRatio, eyesMidPts[i].y*yRatio, eyesDistance[i] / 2 , pOuterBullsEye);
canvas.drawCircle(eyesMidPts[i].x*xRatio, eyesMidPts[i].y*yRatio, eyesDistance[i] / 6 , pInnerBullsEye);
}
}
}
}
【问题讨论】：
标签： android