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132 lines
3.5 KiB
C++
132 lines
3.5 KiB
C++
#pragma once
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// Utils includes
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#include <utils/Image.h>
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namespace hyperion
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{
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///
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/// Result structure of the detected blackborder.
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///
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struct BlackBorder
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{
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/// Falg indicating if the border is unknown
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bool unknown;
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/// The size of the detected horizontal border
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int horizontalSize;
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/// The size of the detected vertical border
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int verticalSize;
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///
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/// Compares this BlackBorder to the given other BlackBorder
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///
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/// @param[in] other The other BlackBorder
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///
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/// @return True if this is the same border as other
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///
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inline bool operator== (const BlackBorder& other) const
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{
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if (unknown)
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{
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return other.unknown;
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}
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return other.unknown==false && horizontalSize==other.horizontalSize && verticalSize==other.verticalSize;
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}
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};
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///
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/// The BlackBorderDetector performs detection of black-borders on a single image.
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/// The detector will search for the upper left corner of the picture in the frame.
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/// Based on detected black pixels it will give an estimate of the black-border.
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///
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class BlackBorderDetector
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{
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public:
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///
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/// Constructs a black-border detector
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/// @param[in] blackborderThreshold The threshold which the blackborder detector should use
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///
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BlackBorderDetector(uint8_t blackborderThreshold);
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///
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/// Performs the actual black-border detection on the given image
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///
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/// @param[in] image The image on which detection is performed
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///
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/// @return The detected (or not detected) black border info
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///
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template <typename Pixel_T>
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BlackBorder process(const Image<Pixel_T> & image)
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{
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// test center and 1/3, 2/3 of width/heigth
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int width = image.width() / 3;
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int height = image.height() / 3;
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int width2 = width * 2;
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int height2 = height * 2;
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int xCenter = image.width() / 2;
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int yCenter = image.height() / 2;
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int firstNonBlackXPixelIndex = -1;
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int firstNonBlackYPixelIndex = -1;
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// find first X pixel of the image
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for (int x = 0; x < width; ++x)
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{
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const Pixel_T & color1 = image(x, yCenter);
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const Pixel_T & color2 = image(x, height);
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const Pixel_T & color3 = image(x, height2);
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if (!isBlack(color1) || !isBlack(color2) || !isBlack(color3))
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{
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firstNonBlackXPixelIndex = x;
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break;
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}
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}
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// find first Y pixel of the image
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for (int y = 0; y < height; ++y)
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{
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const Pixel_T & color1 = image(xCenter, y);
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const Pixel_T & color2 = image(width, y);
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const Pixel_T & color3 = image(width2, y);
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if (!isBlack(color1) || !isBlack(color2) || !isBlack(color3))
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{
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firstNonBlackYPixelIndex = y;
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break;
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}
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}
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// Construct result
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BlackBorder detectedBorder;
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detectedBorder.unknown = firstNonBlackXPixelIndex == -1 || firstNonBlackYPixelIndex == -1;
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detectedBorder.horizontalSize = firstNonBlackYPixelIndex;
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detectedBorder.verticalSize = firstNonBlackXPixelIndex;
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return detectedBorder;
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}
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private:
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///
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/// Checks if a given color is considered black and therefor could be part of the border.
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///
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/// @param[in] color The color to check
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///
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/// @return True if the color is considered black else false
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///
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template <typename Pixel_T>
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inline bool isBlack(const Pixel_T & color)
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{
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// Return the simple compare of the color against black
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return color.red < _blackborderThreshold && color.green < _blackborderThreshold && color.blue < _blackborderThreshold;
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}
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private:
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/// Threshold for the blackborder detector [0 .. 255]
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const uint8_t _blackborderThreshold;
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};
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} // end namespace hyperion
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