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Updated the scan-algorithm to only use half of each border.

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Added doxygen comments to the header file.
This commit is contained in:
T. van der Zwan 2013-08-21 14:52:03 +00:00
parent f8c8fa6c74
commit f262a9eb11
2 changed files with 48 additions and 23 deletions
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34
libsrc/hyperion/BlackBorderDetector.cpp
View File

@ -2,6 +2,7 @@
BlackBorderDetector::BlackBorderDetector() BlackBorderDetector::BlackBorderDetector()
{ {
// empty
} }
BlackBorder BlackBorderDetector::process(const RgbImage& image) BlackBorder BlackBorderDetector::process(const RgbImage& image)
@ -9,7 +10,8 @@ BlackBorder BlackBorderDetector::process(const RgbImage& image)
int firstNonBlackPixelTop = -1; int firstNonBlackPixelTop = -1;
int firstNonBlackPixelLeft = -1; int firstNonBlackPixelLeft = -1;
for (unsigned x=0; x<image.width(); ++x) // Find the non-black pixel at the top-half border
for (unsigned x=0; x<image.width()/2; ++x)
{ {
const RgbColor& color = image(x, 0); const RgbColor& color = image(x, 0);
if (!isBlack(color)) if (!isBlack(color))
@ -18,7 +20,8 @@ BlackBorder BlackBorderDetector::process(const RgbImage& image)
break; break;
} }
} }
for (unsigned y=0; y<image.height(); ++y) // Find the non-black pixel at the left-half border
for (unsigned y=0; y<image.height()/2; ++y)
{ {
const RgbColor& color = image(0, y); const RgbColor& color = image(0, y);
if (!isBlack(color)) if (!isBlack(color))
@ -28,6 +31,7 @@ BlackBorder BlackBorderDetector::process(const RgbImage& image)
} }
} }
// Construct 'unknown' result
BlackBorder detectedBorder; BlackBorder detectedBorder;
detectedBorder.type = BlackBorder::unknown; detectedBorder.type = BlackBorder::unknown;
@ -45,27 +49,23 @@ BlackBorder BlackBorderDetector::process(const RgbImage& image)
} }
else if (firstNonBlackPixelTop < 0) else if (firstNonBlackPixelTop < 0)
{ {
if (firstNonBlackPixelLeft < 0 || firstNonBlackPixelLeft > (int)(image.height()/2) ) if (firstNonBlackPixelLeft < 0)
{ {
// We don't know // We don't know
// B-B-B-B ... B-B-B-B // B-B-B-B ...
// B +---- ... ----- ? // B +---- ...
// B | // B |
// B | // B |
// : // :
// B |
// B |
// B |
// B ?
detectedBorder.type = BlackBorder::unknown; detectedBorder.type = BlackBorder::unknown;
detectedBorder.size = -1; detectedBorder.size = -1;
} }
else //(firstNonBlackPixelLeft > 0 && firstNonBlackPixelLeft < image.height()/2) else //(firstNonBlackPixelLeft > 0)
{ {
// Border at top of screen // Border at top of screen
// B-B-B-B ... B-B-B-B // B-B-B-B ...
// B +---- ... ----- ? // B +---- ...
// C | // C |
// ? | // ? |
// : // :
@ -76,23 +76,19 @@ BlackBorder BlackBorderDetector::process(const RgbImage& image)
} }
else // (firstNonBlackPixelTop > 0) else // (firstNonBlackPixelTop > 0)
{ {
if (firstNonBlackPixelTop < int(image.width()/2) && firstNonBlackPixelLeft < 0) if (firstNonBlackPixelLeft < 0)
{ {
// Border at left of screen // Border at left of screen
// B-B-C-? ... // B-B-C-? ...
// B +---- ... ----- ? // B +---- ...
// B | // B |
// B | // B |
// : // :
// B |
// B |
// B |
// B ?
detectedBorder.type = BlackBorder::vertical; detectedBorder.type = BlackBorder::vertical;
detectedBorder.size = firstNonBlackPixelTop; detectedBorder.size = firstNonBlackPixelTop;
} }
else //(firstNonBlackPixelTop > int(mage.width()/2) || firstNonBlackPixelLeft > 0) else //(firstNonBlackPixelLeft > 0)
{ {
// No black border // No black border
// B-B-C-? ... // B-B-C-? ...

37
libsrc/hyperion/BlackBorderDetector.h
View File

@ -4,8 +4,14 @@
// Utils includes // Utils includes
#include <utils/RgbImage.h> #include <utils/RgbImage.h>
///
/// Result structure of the detected blackborder.
///
struct BlackBorder struct BlackBorder
{ {
///
/// Enumeration of the possible types of detected borders
///
enum Type enum Type
{ {
none, none,
@ -14,25 +20,48 @@ struct BlackBorder
unknown unknown
}; };
/// The type of detected border
Type type; Type type;
int size;
/// The size of detected border (negative if not applicable)
int size;
}; };
///
/// The BlackBorderDetector performs detection of black-borders on a single image.
/// The detector will scan the border of the upper-left quadrant of an image. Based on detected
/// black pixels it will give an estimate of the black-border.
///
class BlackBorderDetector class BlackBorderDetector
{ {
public: public:
///
/// Constructs a black-border detector
///
BlackBorderDetector(); BlackBorderDetector();
///
/// Performs the actual black-border detection on the given image
///
/// @param[in] image The image on which detection is performed
///
/// @return The detected (or not detected) black border info
///
BlackBorder process(const RgbImage& image); BlackBorder process(const RgbImage& image);
private: private:
///
/// Checks if a given color is considered black and therefor could be part of the border.
///
/// @param[in] color The color to check
///
/// @return True if the color is considered black else false
///
inline bool isBlack(const RgbColor& color) inline bool isBlack(const RgbColor& color)
{ {
// Return the simple compare of the color against black
return RgbColor::BLACK == color; return RgbColor::BLACK == color;
// TODO[TvdZ]: We could add a threshold to check that the color is close to black
} }
}; };