Question

我从设备相机中获取图像：

public synchronized void  onPreviewFrame(byte[] data, Camera camera) {

    //Get image from data


}

将图像解码为RGB：

int[] rgb = decodeYUV420SPtoRGB(data, width, height);

RGB到位图：

Bitmap bitmap = rgbToBitmap(rgb,width, height);

在ImageView中打印图像以确保转换正常：

iv.setImageBitmap(bitmap);

检测数字面：

        FaceDetector faceDet = new FaceDetector(bitmap.getWidth(), bitmap.getHeight(), 1);
        Face[] faceList = new Face[1];
        int faces = faceDet.findFaces(bitmap, faceList);
        Log.e("NumFaces: ",faces + "");

解码功能：

private  int[] decodeYUV420SPtoRGB(byte[] yuv420sp, int width, int height) {
    if (yuv420sp == null) throw new NullPointerException();

    final int frameSize = width * height;
    int[] rgb = new int[frameSize];

    for (int j = 0, yp = 0; j < height; j++) {
        int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
        for (int i = 0; i < width; i++, yp++) {
            int y = (0xff & (yuv420sp[yp])) - 16;
            if (y < 0) y = 0;
            if ((i & 1) == 0) {
                v = (0xff & yuv420sp[uvp++]) - 128;
                u = (0xff & yuv420sp[uvp++]) - 128;
            }
            int y1192 = 1192 * y;
            int r = (y1192 + 1634 * v);
            int g = (y1192 - 833 * v - 400 * u);
            int b = (y1192 + 2066 * u);

            if (r < 0) r = 0;
            else if (r > 262143) r = 262143;
            if (g < 0) g = 0;
            else if (g > 262143) g = 262143;
            if (b < 0) b = 0;
            else if (b > 262143) b = 262143;

            rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
        }
    }

    return rgb;

}
 public static Bitmap rgbToBitmap(int[] rgb, int width, int height) {
    if (rgb == null) throw new NullPointerException();

    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
    bitmap.setPixels(rgb, 0, width, 0, 0, width, height);
    return bitmap;
}

我在Log.e中总是0（＆＃34; NumFaces：＆＃34;，faces +＆＃34;＆＃34;）;我在imageView面孔中看到了真实的面孔和照片。我尝试使用物理设备，2.3（坏相机）和4.2（好相机高清）

编辑：在4.2设备中，我在onPreviewFrame中获得800x480帧。

知道会发生什么吗？

Answer 1

我已经解决了这个问题，将设备水平放在我的手中，而不是垂直放置。

FaceDetector不检测面部

1 个答案: