#import "GPUImageFilterGroup.h"
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@class GPUImageGrayscaleFilter;
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@class GPUImage3x3TextureSamplingFilter;
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@class GPUImageNonMaximumSuppressionFilter;
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/*
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An implementation of the Features from Accelerated Segment Test (FAST) feature detector as described in the following publications:
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E. Rosten and T. Drummond. Fusing points and lines for high performance tracking. IEEE International Conference on Computer Vision, 2005.
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E. Rosten and T. Drummond. Machine learning for high-speed corner detection. European Conference on Computer Vision, 2006.
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For more about the FAST feature detector, see the resources here:
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http://www.edwardrosten.com/work/fast.html
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*/
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typedef enum { kGPUImageFAST12Contiguous, kGPUImageFAST12ContiguousNonMaximumSuppressed} GPUImageFASTDetectorType;
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@interface GPUImageFASTCornerDetectionFilter : GPUImageFilterGroup
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{
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GPUImageGrayscaleFilter *luminanceReductionFilter;
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GPUImage3x3TextureSamplingFilter *featureDetectionFilter;
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GPUImageNonMaximumSuppressionFilter *nonMaximumSuppressionFilter;
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// Generate a lookup texture based on the bit patterns
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// Step 1: convert to monochrome if necessary
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// Step 2: do a lookup at each pixel based on the Bresenham circle, encode comparison in two color components
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// Step 3: do non-maximum suppression of close corner points
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}
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- (id)initWithFASTDetectorVariant:(GPUImageFASTDetectorType)detectorType;
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@end
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