#import "GPUImageFilterGroup.h"
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@class GPUImageErosionFilter;
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@class GPUImageDilationFilter;
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// A filter that first performs a dilation on the red channel of an image, followed by an erosion of the same radius.
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// This helps to filter out smaller dark elements.
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@interface GPUImageClosingFilter : GPUImageFilterGroup
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{
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GPUImageErosionFilter *erosionFilter;
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GPUImageDilationFilter *dilationFilter;
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}
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@property(readwrite, nonatomic) CGFloat verticalTexelSpacing, horizontalTexelSpacing;
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- (id)initWithRadius:(NSUInteger)radius;
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@end
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