java实现图片任意角度旋转

java实现图片任意角度旋转

本文实例为大家分享了java实现图片旋转，供大家参考，具体内容如下

方法一：普通方法实现图片旋转

/**

* 图像旋转

* @param src

* @param angel

* @return

*/

public static BufferedImage Rotate(Image src, double angel) {

int src_width = src.getWidth(null);

int src_height = src.getHeight(null);

// calculate the new image size

Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(

src_width, src_height)), angel);

BufferedImage res = null;

res = new BufferedImage(rect_des.width, rect_des.height,

BufferedImage.TYPE_3BYTE_BGR);

Graphics2D g2 = res.createGraphics();

// transform

g2.translate((rect_des.width - src_width) / 2,

(rect_des.height - src_height) / 2);

g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);

g2.drawImage(src, null, null);

return res;

}

public static Rectangle CalcRotatedSize(Rectangle src, double angel) {

// if angel is greater than 90 degree, we need to do some conversion

if (angel >= 90) {

if(angel / 90 % 2 == 1){

int temp = src.height;

src.height = src.width;

src.width = temp;

}

angel = angel % 90;

}

double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;

double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;

double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;

double angel_dalta_width = Math.atan((double) src.height / src.width);

double angel_dalta_height = Math.atan((double) src.width / src.height);

int len_dalta_whttp://idth = (int) (len * Math.cos(Math.PI - angel_alpha

- angel_dalta_width));

len_dalta_width=len_dalta_width>0?len_dalta_width:-len_dalta_width;

int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha

- angel_dalta_height));

len_dalta_height=len_dalta_height>0?len_dalta_height:-len_dalta_height;

int des_width = src.width + len_dalta_width * 2;

int des_height = src.height + len_dalta_height * 2;

des_width=des_width>0?des_width:-des_width;

des_height=des_height>0?des_height:-des_height;

return new java.awt.Rectangle(new Dimension(des_width, des_height));

}

方法二：opencv实现图片旋转

/**

* opencv实现图片旋转

* @param splitImage

* @param angle

* @return

*/

public static Mat rotate3(Mat splitImage, double angle)

{

double thera = angle * Math.PI / 180;

double a = Math.sin(thera);

double b = Math.cos(thera);

int wsrc = splitImage.width();

int hsrc = splitImage.height();

int wdst = (int) (hsrc * Math.abs(a) + wsrc * Math.abs(b));

int hdst = (int) (wsrc * Math.abs(a) + hsrc * Math.abs(b));

Mat imgDst = new Mat(hdst, wdst, splitImage.type());

Point pt = new Point(splitImage.cols() / 2, splitImage.rows() / 2);

// 获取仿射变换矩阵

Mat affineTrans = Imgproc.getRotationMatrix2D(pt, angle, 1.0);

System.out.println(affineTrans.dump());

// 改变变换矩阵第三列的值

affineTrans.put(0, 2, affineTrans.get(0, 2)[0] + (wdst - wsrc) / 2);

affineTrans.put(1, 2, affineTrans.get(1, 2)[0] + (hdst - hsrc) / 2);

Imgproc.warpAffine(splitImage, imgDst, affineTrans, imgDst.size(),

Imgproc.INTER_CUBIC | Imgproc.WARP_FILL_OUTLIERS);

return imgDst;

}

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。