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
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/**
* 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_width = (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));
}
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方法二：opencv实现图片旋转
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/**
* 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;
}
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/zwl18210851801/article/details/81279622