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Added the histogram equalization filter.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| public class HistogramEqualization: OperationGroup { | ||
| public var downsamplingFactor: UInt = 16 { didSet { histogram.downsamplingFactor = downsamplingFactor } } | ||
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| let histogram:Histogram | ||
| let rawDataInput = RawDataInput() | ||
| let rawDataOutput = RawDataOutput() | ||
| let equalizationFilter:BasicOperation | ||
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| public init(type:HistogramType) { | ||
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| self.histogram = Histogram(type:type) | ||
| switch type { | ||
| case .Red: self.equalizationFilter = BasicOperation(fragmentShader:HistogramEqualizationRedFragmentShader, numberOfInputs:2) | ||
| case .Blue: self.equalizationFilter = BasicOperation(fragmentShader:HistogramEqualizationBlueFragmentShader, numberOfInputs:2) | ||
| case .Green: self.equalizationFilter = BasicOperation(fragmentShader:HistogramEqualizationGreenFragmentShader, numberOfInputs:2) | ||
| case .Luminance: self.equalizationFilter = BasicOperation(fragmentShader:HistogramEqualizationLuminanceFragmentShader, numberOfInputs:2) | ||
| case .RGB: self.equalizationFilter = BasicOperation(fragmentShader:HistogramEqualizationRGBFragmentShader, numberOfInputs:2) | ||
| } | ||
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| super.init() | ||
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| ({downsamplingFactor = 16})() | ||
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| self.configureGroup{input, output in | ||
| self.rawDataOutput.dataAvailableCallback = {data in | ||
| var redHistogramBin = [Int](count:256, repeatedValue:0) | ||
| var greenHistogramBin = [Int](count:256, repeatedValue:0) | ||
| var blueHistogramBin = [Int](count:256, repeatedValue:0) | ||
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| let rowWidth = 256 * 4 | ||
| redHistogramBin[0] = Int(data[rowWidth]) | ||
| greenHistogramBin[1] = Int(data[rowWidth + 1]) | ||
| blueHistogramBin[2] = Int(data[rowWidth + 2]) | ||
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| for dataIndex in 1..<256 { | ||
| redHistogramBin[dataIndex] = redHistogramBin[dataIndex - 1] + Int(data[rowWidth + (dataIndex * 4)]) | ||
| greenHistogramBin[dataIndex] = greenHistogramBin[dataIndex - 1] + Int(data[rowWidth + (dataIndex * 4) + 1]) | ||
| blueHistogramBin[dataIndex] = blueHistogramBin[dataIndex - 1] + Int(data[rowWidth + (dataIndex * 4) + 2]) | ||
| } | ||
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| var equalizationLookupTable = [UInt8](count:256 * 4, repeatedValue:0) | ||
| for binIndex in 0..<256 { | ||
| equalizationLookupTable[binIndex * 4] = UInt8((((redHistogramBin[binIndex] - redHistogramBin[0]) * 255) / redHistogramBin[255])) | ||
| equalizationLookupTable[(binIndex * 4) + 1] = UInt8((((greenHistogramBin[binIndex] - greenHistogramBin[0]) * 255) / greenHistogramBin[255])) | ||
| equalizationLookupTable[(binIndex * 4) + 2] = UInt8((((blueHistogramBin[binIndex] - blueHistogramBin[0]) * 255) / blueHistogramBin[255])) | ||
| equalizationLookupTable[(binIndex * 4) + 3] = 255 | ||
| } | ||
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| self.rawDataInput.uploadBytes(equalizationLookupTable, size:Size(width:256, height:1), pixelFormat:.RGBA) | ||
| } | ||
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| input --> self.histogram --> self.rawDataOutput | ||
| input --> self.equalizationFilter --> output | ||
| self.rawDataInput --> self.equalizationFilter | ||
| } | ||
| } | ||
| } |
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