使用动态坐标通过相机捕获图像 [英] Capture image using dynamic co-ordinates through the camera
问题描述
我正在制作一个基于相机的应用程序，在该应用程序中，我在相机上放置了一个矩形视图.
当我使用new Camera.PictureCallback()捕获图像时，我对该图像进行了裁剪，以便获得矩形的一部分.
好吧，它的工作正常.
I am making a camera based application, where I put a rectangular view over the camera.
When I capture an image using new Camera.PictureCallback(), I cropped that image so as it will get the part of the rectangle.
Well, its working fine.
现在，我实现了View.OnTouchListener，并使用它使形状可移动.
Now I implemented View.OnTouchListener and using that I made the shape movable.
因此，我需要使用用户的最终选择来捕获图像，就像他们放置矩形的位置一样.
So, I need to capture the image with the final selection of the user, like where they place the rectangle.
Bitmap imageOriginal = BitmapFactory.decodeByteArray(data, 0, data.length); // 2560×1440
float scale = 1280 / 1000;
int left = (int) (scale * (imageOriginal.getWidth() - 250) / 2);
int top = (int) (scale * (imageOriginal.getHeight() - 616) / 2);
int width = (int) (scale * 750);
int height = (int) (scale * 616);
Bitmap imageConverted = Bitmap.createBitmap(imageOriginal, left, top, width, height, null, false);
这是我用来裁剪图像的方法.这些值很难找到确切的位置. 现在，我需要具有不断变化的矩形的顶部，底部，高度，宽度的值.
This is the method i used to crop image.The values are hard corded to find the exact position. Now i need values for that top ,bottom, height, width with the changing rectangle.
//我用来绘制矩形的customView
//My customView that used to draw that rectangle
public class CustomView extends View {
private Paint paint = new Paint();
public CustomView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) { // Override the onDraw() Method
super.onDraw(canvas);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.GREEN);
paint.setStrokeWidth(10);
//center
int x0 = canvas.getWidth()/2;
int y0 = canvas.getHeight()/2;
int dx = canvas.getHeight()/3;
int dy = canvas.getHeight()/3;
//draw guide box
canvas.drawRect(x0-dx, y0-dy, x0+dx, y0+dy, paint);
}
}
//我的图片回调代码
Camera.PictureCallback mPicture = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
// Replacing the button after a photho was taken.
// File name of the image that we just took.
fileName = "IMG_" + new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()).toString() + ".jpg";
// Creating the directory where to save the image. Sadly in older
// version of Android we can not get the Media catalog name
File mkDir = new File(sdRoot, dir);
mkDir.mkdirs();
// Main file where to save the data that we recive from the camera
File pictureFile = new File(sdRoot, dir + fileName);
// Cropping image with the corresponding co-ordinates and save in to a file
try {
Bitmap imageOriginal = BitmapFactory.decodeByteArray(data, 0, data.length); // 2560×1440
float scale = 1280 / 1000;
int left = (int) (scale * (imageOriginal.getWidth() - 250) / 2);
int top = (int) (scale * (imageOriginal.getHeight() - 616) / 2);
int width = (int) (scale * 750);
int height = (int) (scale * 616);
Bitmap imageConverted = Bitmap.createBitmap(imageOriginal, left, top, width, height, null, false);
FileOutputStream purge = new FileOutputStream(pictureFile);
imageConverted.compress(Bitmap.CompressFormat.JPEG, 100, purge);
purge.flush();
purge.close();
} catch (FileNotFoundException e) {
Log.d("DG_DEBUG", "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d("DG_DEBUG", "Error accessing file: " + e.getMessage());
}
// Adding Exif data for the orientation.
try {
ProjectManager.getInstance().settings.IMAGE_LOCATION = "/sdcard/" + dir + fileName;
exif = new ExifInterface(ProjectManager.getInstance().settings.IMAGE_LOCATION);
exif.setAttribute(ExifInterface.TAG_ORIENTATION, "" + orientation);
exif.saveAttributes();
mView.saveImage(dir + fileName);
} catch (IOException e) {
e.printStackTrace();
}
}
};
推荐答案
对我来说，我先拍摄一张图片，然后根据图片中所选区域的尺寸进行裁剪.
For me, I take a image then crop according to dimension of the selected area of the image..
public void onPictureTaken(byte[] data, Camera camera) {
Bitmap imageOriginal = BitmapFactory.decodeByteArray(data, 0, data.length, null);
int width = imageOriginal.getWidth();
int height = imageOriginal.getHeight(); // for width
int narrowSize = Math.min(width, height); // for height
int differ = (int) Math.abs((imageOriginal.getHeight() - imageOriginal.getWidth()) / 2.0f); // for dimension
width = (width == narrowSize) ? 0 : differ;
height = (width == 0) ? differ : 0;
Matrix rotationMatrix = new Matrix();
rotationMatrix.postRotate(90); // for orientation
Bitmap imageCropped = Bitmap.createBitmap(imageOriginal, width, height, narrowSize, narrowSize, rotationMatrix, false);
}
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