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我使用 tesseract 库来从图像中捕获某些文本。我知道捕获的图像没有保存在任何地方，它会被回收。我需要找到原始的彩色位图。我一直在尝试找到原始的彩色位图，但我只能找到一个灰度位图：

Bitmap bitmap = activity.getCameraManager().buildLuminanceSource(data, width, height).renderCroppedGreyscaleBitmap();

当我将此位图保存到 SD 卡时，我得到一个灰度图像。renderCroppedGreyscaleBitmap() 方法如下：

public Bitmap renderCroppedGreyscaleBitmap() {
    int width = getWidth();
    int height = getHeight();
    int[] pixels = new int[width * height];
    byte[] yuv = yuvData;
    int inputOffset = top * dataWidth + left;

    for (int y = 0; y < height; y++) {
      int outputOffset = y * width;
      for (int x = 0; x < width; x++) {
        int grey = yuv[inputOffset + x] & 0xff;
        pixels[outputOffset + x] = 0xFF000000 | (grey * 0x00010101);
      }
      inputOffset += dataWidth;
    }

    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
    return bitmap;
  }

如果有人能告诉我获取原始彩色图像，我将不胜感激。我是否必须更改此方法才能获得彩色图像（RGB）？

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1 回答 1

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    /**
     * YUV to bitmap
     * @param data   The YUV preview frame.
     * @param width  The width of the preview frame.
     * @param height The height of the preview frame.
     * @return
     */
    public static Bitmap byteArray2Bitmap(byte[] data, int width, int height) {
        YuvImage yuvimage = new YuvImage(data, ImageFormat.NV21, width, height, null);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        yuvimage.compressToJpeg(new Rect(0, 0, width, height), 100, baos);
        byte[] rawImage = baos.toByteArray();

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.RGB_565;
        Bitmap bitmap = BitmapFactory.decodeByteArray(rawImage, 0, rawImage.length, options);

        Matrix matrix = new Matrix();
        matrix.postRotate(90);
        return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
    }
于 2020-07-13T13:07:22.243 回答