标签：图像捕捉
CGImageRef oldImageRef=image.CGImage;
UIImage* newImage=[UIImage imageWithCGImage:oldImageRef];
注释：UIImage* newImage=[UIImage imageWithCGImage:oldImageRef scale:.1 orientation:UIImageOrientationRight];
使用上面的语句，可以将图像旋转90度变成我们需要的样子。NSData* data=UIImageJPEGRepresentation(image, 0);
NSLog(@"%lu",(unsigned long)data.length);
CGImageRef imageRef=image.CGImage;
CGImageRef newimage=CGImageCreateWithImageInRect(imageRef, rect);
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-
(UIImage *)image:(UIImage *)image rotation:(UIImageOrientation)orientation{ long
double
rotate = 0.0; CGRect
rect; float
translateX = 0; float
translateY = 0; float
scaleX = 1.0; float
scaleY = 1.0; switch
(orientation) { case
UIImageOrientationLeft: rotate
= M_PI_2; rect
= CGRectMake(0,
0,
image.size.height, image.size.width); translateX
= 0; translateY
= -rect.size.width; scaleY
= rect.size.width/rect.size.height; scaleX
= rect.size.height/rect.size.width; break; case
UIImageOrientationRight: rotate
= 3
* M_PI_2; rect
= CGRectMake(0,
0,
image.size.height, image.size.width); translateX
= -rect.size.height; translateY
= 0; scaleY
= rect.size.width/rect.size.height; scaleX
= rect.size.height/rect.size.width; break; case
UIImageOrientationDown: rotate
= M_PI; rect
= CGRectMake(0,
0,
image.size.width, image.size.height); translateX
= -rect.size.width; translateY
= -rect.size.height; break; default: rotate
= 0.0; rect
= CGRectMake(0,
0,
image.size.width, image.size.height); translateX
= 0; translateY
= 0; break; } UIGraphicsBeginImageContext(rect.size); CGContextRef
context = UIGraphicsGetCurrentContext(); //做CTM变换 CGContextTranslateCTM(context,
0.0,
rect.size.height); CGContextScaleCTM(context,
1.0,
-1.0); CGContextRotateCTM(context,
rotate); CGContextTranslateCTM(context,
translateX, translateY); CGContextScaleCTM(context,
scaleX, scaleY); //绘制图片 CGContextDrawImage(context,
CGRectMake(0,
0,
rect.size.width, rect.size.height), image.CGImage); UIImage
*newPic = UIGraphicsGetImageFromCurrentImageContext(); return
newPic;} |
结论：
这里的解决方案，就是对底层像素矩阵进行装换之后，在对里面数据截取一部分。可以解决截取部分内容的问题。
-------------------
2：解决方案二：就是对rect进行装换，根据数据底层，进行rect的转换。
直接获取摄像头传回的图像数据（人脸、微笑、眨眼： 识别-->第一步）：图像识别第一步
标签：图像捕捉
原文地址：http://blog.csdn.net/u012681458/article/details/40190339
