Objective-C中框架的水平翻转
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23-10-2019 - |
题
我正在尝试为我的程序(流式摄像头流)创建一个过滤器,该程序使框架水平翻转,使网络摄像头像镜像一样。
但是,尽管它进行了编译和运行,但该过滤器似乎对此没有任何影响。
这是代码:
CIImage *resultImage = image;
CIFilter *flipFilter = [CIFilter filterWithName:@"CIAffineTransform"];
[flipFilter setValue:resultImage forKey:@"inputTransform"];
NSAffineTransform* flipTransform = [NSAffineTransform transform];
[flipTransform scaleXBy:-1.0 yBy:1.0]; //horizontal flip
[flipFilter setValue:flipTransform forKey:@"inputTransform"];
resultImage = [flipFilter valueForKey:@"outputImage"];
奇怪的是,其他过滤器似乎有效。例如:
CIFilter * ciEffectFilter = [CIFilter filterWithName:@"CIGloom"];
[ciEffectFilter setDefaults];
CIImage *resultImage = image;
[ciEffectFilter setValue: resultImage forKey:@"inputImage"];
[ciEffectFilter setValue:[NSNumber numberWithFloat: 0.75]
forKey:@"inputIntensity"];
[ciEffectFilter setValue:[NSNumber numberWithFloat: 20]
forKey:@"inputRadius"];
resultImage = [ciEffectFilter valueForKey:@"outputImage"];
CIFilter *ciCropFilter = [CIFilter filterWithName:@"CICrop"];
[ciCropFilter setDefaults];
[ciCropFilter setValue: resultImage forKey:@"inputImage"];
[ciCropFilter setValue: [CIVector vectorWithX:50 Y:50 Z:300 W:
300] forKey:@"inputRectangle"];
resultImage = [ciCropFilter valueForKey:@"outputImage"];
与NsaffineTransform有关吗?我环顾四周,但没有找到任何答案。谢谢堆!
解决方案
我不确定这是否是问题,但是在您的第一个代码段中,您正在为同一键设置两个不同的值(您设置 inputTransform
两次),我认为第一个应该是 inputImage
反而。尝试以下内容:
CIImage *resultImage = image;
CIFilter *flipFilter = [CIFilter filterWithName:@"CIAffineTransform"];
[flipFilter setValue:resultImage forKey:@"inputImage"];
NSAffineTransform* flipTransform = [NSAffineTransform transform];
[flipTransform scaleXBy:-1.0 yBy:1.0]; //horizontal flip
[flipFilter setValue:flipTransform forKey:@"inputTransform"];
resultImage = [flipFilter valueForKey:@"outputImage"];
另外,您可能需要按图像的宽度翻译X轴
[flipTransform translateXBy:... yBy:0];
其他提示
CIImage *cimage = [[CIImage alloc] initWithImage:image];
您不是在分配CIIMAGE对象。尝试此代码。
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