132 lines
3.2 KiB
C++
132 lines
3.2 KiB
C++
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#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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///
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BlackBorderDetector();
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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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// only test the topleft third of the image
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int width = image.width() /3;
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int height = image.height() / 3;
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int maxSize = std::max(width, height);
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int firstNonBlackXPixelIndex = -1;
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int firstNonBlackYPixelIndex = -1;
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// find some pixel of the image
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for (int i = 0; i < maxSize; ++i)
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{
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int x = std::min(i, width);
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int y = std::min(i, height);
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const Pixel_T & color = image(x, y);
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if (!isBlack(color))
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{
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firstNonBlackXPixelIndex = x;
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firstNonBlackYPixelIndex = y;
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break;
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}
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}
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// expand image to the left
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for(; firstNonBlackXPixelIndex > 0; --firstNonBlackXPixelIndex)
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{
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const Pixel_T & color = image(firstNonBlackXPixelIndex-1, firstNonBlackYPixelIndex);
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if (isBlack(color))
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{
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break;
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}
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}
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// expand image to the top
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for(; firstNonBlackYPixelIndex > 0; --firstNonBlackYPixelIndex)
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{
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const Pixel_T & color = image(firstNonBlackXPixelIndex, firstNonBlackYPixelIndex-1);
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if (isBlack(color))
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{
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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+color.green+color.green == 0;
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}
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};
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} // end namespace hyperion
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