我正在使用自定义相机并且工作正常,但问题是图像以非常低(差)质量保存。为了克服它,我已经尝试了所有的建议和实现。喜欢,
parameters.setJpegQuality(100);
parameters.setPictureFormat(ImageFormat.JPEG);
这不起作用。之后我用了
List<Size> sizes = cameraParams.getSupportedPictureSizes();
Camera.Size size = sizes.get(0);
for(int i=0;i<sizes.size();i++)
{
if(sizes.get(i).width > size.width)
size = sizes.get(i);
}
cameraParams.setPictureSize(mPictureSize.width, mPictureSize.height);
这也行不通。它的质量仍然很差。
注意:相机预览显示质量正常,但问题是将拍摄的图像保存到SD卡文件夹。
高级帮助将不胜感激!!
答案 0 :(得分:5)
最后我的问题解决了。
在我拍摄图像之前,我在设置parameters
进行相机预览
public void takePicture() {
mCamera.takePicture(new ShutterCallback() {
@Override
public void onShutter() {
}
}, new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
}
}, new PictureCallback() {
@Override
public void onPictureTaken(final byte[] data, Camera camera) {
data1 = data;
if (mCamera != null) {
mCamera.stopPreview();
}
}
});
}
所以在我在片段中调用此函数之前,我已经在此方法之前设置了参数。
mPreview.setParams(params);// This was the mistake what i have done !
mPreview.takePicture();
在删除mPreview.setParams(params);
答案 1 :(得分:1)
我可以向您展示重置预览尺寸的方法:
您应该在相机处更改预览参数。
private void setImageSize() {
Camera.Size size = CameraUtil.findClosetImageSize(mRxCamera.getNativeCamera(), PREFER_SIZE);
mCamera.getNativeCamera().getParameters().setPictureSize(size.width, size.height);
WIDTH = size.width;
HEIGHT = size.height;
}
之后您需要更改布局尺寸
private void resetPreviewSize() {
final boolean widthIsMax = mWidth > mHeight;
final Camera.Size size = mCamera.getNativeCamera().getParameters().getPreviewSize();
final RectF rectDisplay = new RectF();
final RectF rectPreview = new RectF();
rectDisplay.set(0, 0, mWidth, mHeight);
final int width = widthIsMax ? size.width : size.height;
final int height = widthIsMax ? size.height : size.width;
rectPreview.set(0, 0, width, height);
final Matrix matrix = new Matrix();
matrix.setRectToRect(rectDisplay, rectPreview, Matrix.ScaleToFit.START);
matrix.invert(matrix);
matrix.mapRect(rectPreview);
mCameraView.getLayoutParams().height = (int) (rectPreview.bottom);
mCameraView.getLayoutParams().width = (int) (rectPreview.right);
mCameraView.requestLayout();
}
如果你需要
public static Camera.Size findClosetImageSize(Camera camera, Point preferSize) {
int preferX = preferSize.x;
int preferY = preferSize.y;
Camera.Parameters parameters = camera.getParameters();
List<Camera.Size> allSupportSizes = parameters.getSupportedPictureSizes();
Log.d(TAG, "all support Image size: " + dumpPreviewSizeList(allSupportSizes));
int minDiff = Integer.MAX_VALUE;
int index = 0;
for (int i = 0; i < allSupportSizes.size(); i++) {
Camera.Size size = allSupportSizes.get(i);
int x = size.width;
int y = size.height;
int diff = Math.abs(x - preferX) + Math.abs(y - preferY);
if (diff < minDiff) {
minDiff = diff;
index = i;
}
}
return allSupportSizes.get(index);
}