#import "GPUImageFilterGroup.h"
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@class GPUImageRGBErosionFilter;
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@class GPUImageRGBDilationFilter;
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// A filter that first performs an erosion on each color channel of an image, followed by a dilation of the same radius.
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// This helps to filter out smaller bright elements.
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@interface GPUImageRGBOpeningFilter : GPUImageFilterGroup
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{
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GPUImageRGBErosionFilter *erosionFilter;
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GPUImageRGBDilationFilter *dilationFilter;
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}
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- (id)initWithRadius:(NSUInteger)radius;
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@end
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