histogram

This commit is contained in:
Damian Kowalski 2024-04-06 21:28:58 +02:00
parent d833cd8995
commit f1e4e73833

View File

@ -22,21 +22,56 @@ Histogram::~Histogram()
delete L; delete L;
} }
void Histogram::generate(QImage* image) void Histogram::generate(QImage* image) {
{ R->clear();
qDebug() << Q_FUNC_INFO << "Not implemented yet!"; G->clear();
B->clear();
L->clear();
if (image == nullptr) {
qDebug() << "Invalid image provided.";
return;
}
for (int y = 0; y < image->height(); ++y) {
for (int x = 0; x < image->width(); ++x) {
QColor pixelColor = image->pixelColor(x, y);
R->insert(pixelColor.red(), R->value(pixelColor.red()) + 1);
G->insert(pixelColor.green(), G->value(pixelColor.green()) + 1);
B->insert(pixelColor.blue(), B->value(pixelColor.blue()) + 1);
int luminance = qRound(0.299 * pixelColor.red() + 0.587 * pixelColor.green() + 0.114 * pixelColor.blue());
L->insert(luminance, L->value(luminance) + 1);
}
}
} }
/** Returns the maximal value of the histogram in the given channel */ int Histogram::maximumValue(Channel selectedChannel)
int Histogram::maximumValue(Channel selectedChannel = RGB)
{ {
qDebug() << Q_FUNC_INFO << "Not implemented yet!"; int maxVal = 0;
return 0; if (selectedChannel == RGB) {
int maxR = maximumValue(RChannel);
int maxG = maximumValue(GChannel);
int maxB = maximumValue(BChannel);
maxVal = std::max(maxR, std::max(maxG, maxB));
}
else {
QHash<int, int>* hist = get(selectedChannel);
QHash<int, int>::const_iterator cit = hist->constBegin();
while (cit != hist->constEnd()) {
if (cit.value() > maxVal) {
maxVal = cit.value();
}
++cit;
}
}
return maxVal;
} }
/** Returns a pointer to the given channel QHash<int, int> */
QHash<int, int>* Histogram::get(Channel channel = LChannel) QHash<int, int>* Histogram::get(Channel channel = LChannel)
{ {
if (channel==LChannel) return L; if (channel==LChannel) return L;