Ich arbeite an einem Programm, wo ich einen Teil eines Bildes nehme und den durchschnittlichen RGB-Wert dieses Bildes berechne. Wenn ich es berechne, bekomme ich völlig andere Werte, als ob ich die eingebaute Funktion benutzen würde. Wenn ich meine Zahlen teste und sie in eine RGB-Farbkarte lege, sind sie ausgeschaltet, während die eingebaute Funktion sehr genau ist. Das Problem mit der eingebauten Funktion ist, dass es buchstäblich keine Funktionalität hat. Es gibt nur aus, was ich berechne, aber ich kann diese Daten nicht verwenden. link to function called dump()Selbst berechnete RGB-Werte stimmen nicht mit den tatsächlichen RGB-Werten überein
public void readSquares(Mat img){
int width = 20;
int height = 20;
int rSum = 0;
int gSum = 0;
int bSum = 0;
int rAvg = 0;
int gAvg = 0;
int bAvg = 0;
Imgproc.cvtColor(img, img, Imgproc.COLOR_BGR2RGB);
int channels = img.channels();
int totalBytes = (int)(img.total() * img.channels());
byte buff[] = new byte[totalBytes];
img.get(0, 0, buff);
for (int i=0; i< height; i++) {
//stride is the number of bytes in a row of smallImg
int stride = channels * width;
for (int j=0; j<stride; j+=channels) {
int r = buff[(i * stride) + j];
int g = buff[(i * stride) + j + 1];
int b = buff[(i * stride) + j + 2];
if(r < 0 || g < 0 || b < 0){
r = Math.abs(r);
g = Math.abs(g);
b = Math.abs(b);
}
rSum += r;
gSum += g;
bSum += b;
}
}
rAvg = (int) (rSum/img.total()); //total pixels in picture
gAvg = (int) (gSum/img.total());
bAvg = (int) (bSum/img.total());
System.out.println("R: " + rAvg);
System.out.println("G: " + gAvg);
System.out.println("B: " + bAvg);
unten Dieser druckt die genauen Werte, aber ich kann nicht die einzelnen Kanäle erhalten oder die durchschnittliche RGB finden es einfach alles ausspuckt als String, die ich nicht nutzen kann.
System.out.println(img.dump());
}
Hier ist ein Beispiel; Ich lese Rot für Pixel dies war die Ausgabe:
Mein Berechnete
R:18
G:27
B:64
Die Funktion Die erste Zahl der R zweite die G und dem dritten der B. Es ist für jeden das tut Pixel im Bild.
[237, 24, 60, 236, 23, 59, 236, 26, 56, 234, 25, 55, 238, 27, 62, 238, 27, 62, 238, 27, 62, 236, 25, 60, 234, 24, 59, 233, 23, 57, 234, 24, 59, 234, 24, 59, 235, 22, 59, 235, 22, 59, 237, 21, 59, 235, 20, 58, 237, 19, 56, 237, 19, 56, 239, 19, 52, 237, 18, 51;
236, 24, 55, 237, 25, 56, 237, 25, 54, 237, 25, 54, 236, 26, 56, 237, 27, 57, 238, 28, 58, 239, 29, 59, 238, 27, 62, 234, 24, 59, 237, 24, 62, 237, 24, 62, 238, 22, 63, 237, 20, 61, 235, 20, 58, 235, 20, 58, 237, 19, 58, 239, 21, 61, 237, 19, 56, 236, 18, 55;
238, 26, 57, 238, 26, 57, 234, 25, 53, 232, 23, 50, 236, 26, 54, 237, 27, 55, 237, 27, 55, 237, 27, 55, 237, 26, 61, 236, 25, 60, 237, 24, 62, 237, 24, 62, 238, 22, 63, 237, 20, 61, 238, 22, 63, 238, 22, 63, 238, 20, 61, 238, 20, 61, 237, 19, 56, 236, 18, 55;
242, 30, 60, 240, 27, 58, 235, 24, 49, 233, 21, 47, 234, 22, 48, 237, 26, 52, 236, 25, 50, 237, 26, 52, 238, 26, 57, 237, 25, 56, 239, 23, 62, 239, 23, 62, 238, 22, 63, 238, 22, 63, 238, 19, 63, 239, 20, 65, 238, 20, 61, 239, 21, 63, 238, 20, 59, 236, 18, 57;
240, 27, 62, 236, 23, 59, 236, 24, 53, 236, 24, 53, 235, 23, 51, 234, 22, 50, 235, 23, 51, 236, 24, 53, 237, 24, 60, 236, 23, 59, 237, 24, 64, 237, 24, 64, 237, 24, 64, 236, 22, 63, 238, 22, 63, 238, 22, 63, 237, 20, 61, 237, 20, 61, 237, 21, 59, 235, 20, 58;
238, 25, 61, 237, 24, 60, 237, 24, 60, 237, 24, 60, 235, 22, 57, 236, 23, 59, 235, 22, 57, 235, 22, 57, 234, 21, 56, 236, 23, 59, 237, 24, 62, 236, 23, 61, 237, 20, 61, 237, 20, 61, 238, 21, 65, 238, 21, 65, 238, 22, 63, 237, 20, 61, 235, 22, 59, 235, 22, 59;
238, 27, 62, 237, 26, 61, 237, 24, 60, 236, 23, 59, 236, 24, 55, 236, 24, 55, 236, 24, 55, 234, 22, 52, 237, 22, 53, 237, 22, 53, 237, 21, 57, 237, 21, 57, 237, 21, 59, 237, 21, 59, 237, 20, 61, 237, 20, 61, 236, 22, 63, 236, 22, 63, 236, 22, 63, 235, 21, 61;
237, 26, 63, 236, 25, 62, 237, 24, 62, 237, 24, 62, 238, 25, 63, 237, 24, 62, 237, 21, 57, 238, 22, 59, 237, 21, 57, 237, 21, 57, 235, 20, 56, 235, 20, 56, 235, 20, 56, 237, 21, 57, 237, 21, 57, 238, 22, 59, 235, 23, 53, 236, 24, 55, 236, 24, 53, 236, 24, 53;
236, 29, 69, 235, 28, 68, 238, 26, 70, 239, 27, 71, 240, 25, 68, 238, 24, 67, 237, 24, 64, 236, 22, 63, 237, 20, 61, 235, 19, 60, 237, 19, 58, 236, 18, 57, 237, 21, 59, 237, 21, 59, 238, 22, 59, 240, 25, 61, 237, 25, 56, 236, 24, 55, 236, 24, 53, 237, 25, 54;
235, 28, 66, 235, 28, 66, 237, 25, 65, 240, 29, 68, 241, 27, 67, 238, 25, 65, 239, 23, 64, 238, 22, 63, 237, 19, 58, 237, 19, 58, 237, 17, 57, 237, 17, 57, 240, 20, 57, 241, 21, 59, 238, 21, 53, 239, 22, 55, 240, 26, 55, 238, 23, 53, 237, 22, 51, 237, 22, 51;
237, 25, 69, 237, 25, 69, 239, 27, 73, 239, 27, 73, 240, 25, 70, 241, 26, 71, 239, 22, 66, 237, 20, 63, 238, 20, 61, 237, 18, 60, 236, 17, 59, 237, 18, 60, 238, 20, 59, 239, 21, 61, 238, 22, 59, 238, 22, 59, 239, 25, 54, 237, 22, 51, 237, 23, 49, 235, 22, 48;
237, 25, 65, 238, 27, 66, 238, 27, 66, 238, 27, 66, 238, 27, 66, 237, 25, 65, 236, 22, 63, 235, 21, 61, 235, 22, 59, 235, 22, 59, 234, 18, 57, 237, 21, 59, 238, 22, 61, 238, 22, 61, 238, 22, 59, 238, 22, 59, 238, 20, 57, 238, 20, 57, 237, 20, 52, 237, 20, 52;
236, 25, 60, 236, 25, 60, 238, 27, 62, 239, 29, 63, 237, 26, 61, 236, 25, 60, 237, 26, 61, 236, 25, 60, 236, 23, 59, 235, 22, 57, 236, 23, 59, 235, 22, 57, 237, 24, 60, 236, 23, 59, 238, 22, 59, 237, 21, 57, 237, 21, 57, 235, 20, 56, 236, 18, 55, 235, 17, 54;
237, 25, 56, 238, 26, 57, 237, 27, 57, 237, 27, 57, 236, 26, 56, 237, 27, 57, 238, 28, 58, 237, 27, 57, 237, 27, 57, 238, 28, 58, 240, 27, 58, 237, 25, 56, 236, 23, 59, 236, 23, 59, 237, 21, 57, 237, 21, 57, 235, 20, 58, 235, 20, 58, 236, 18, 55, 236, 18, 55;
237, 25, 54, 237, 25, 54, 237, 25, 54, 235, 23, 51, 237, 25, 56, 240, 27, 58, 237, 26, 61, 236, 25, 60, 237, 26, 63, 237, 26, 63, 238, 27, 66, 236, 24, 64, 237, 24, 64, 236, 22, 63, 237, 20, 61, 235, 19, 60, 236, 17, 59, 236, 17, 59, 236, 18, 57, 235, 16, 56;
237, 25, 56, 237, 25, 56, 236, 23, 59, 238, 25, 61, 237, 24, 62, 238, 25, 63, 237, 24, 64, 238, 25, 65, 240, 25, 68, 238, 24, 67, 237, 23, 66, 237, 23, 66, 238, 21, 65, 238, 21, 65, 237, 20, 63, 237, 20, 63, 235, 19, 62, 235, 19, 62, 235, 19, 60, 235, 19, 60;
237, 25, 56, 237, 25, 56, 237, 24, 60, 237, 24, 60, 237, 24, 64, 234, 20, 60, 237, 23, 66, 238, 24, 67, 238, 24, 69, 237, 23, 68, 236, 23, 70, 234, 22, 69, 236, 22, 67, 233, 18, 63, 236, 22, 65, 235, 21, 63, 236, 22, 63, 234, 20, 60, 235, 22, 59, 235, 22, 59;
238, 27, 55, 238, 27, 55, 239, 24, 56, 241, 27, 58, 237, 24, 62, 237, 24, 62, 237, 23, 66, 238, 24, 67, 237, 24, 71, 237, 24, 71, 236, 23, 72, 234, 22, 71, 231, 19, 65, 236, 23, 70, 236, 24, 68, 236, 24, 68, 237, 24, 62, 236, 23, 61, 236, 24, 55, 238, 26, 57;
239, 29, 63, 236, 25, 60, 236, 25, 62, 236, 25, 62, 236, 24, 64, 237, 25, 65, 234, 27, 67, 232, 26, 66, 238, 31, 74, 236, 29, 71, 234, 26, 71, 231, 24, 69, 232, 25, 70, 234, 26, 71, 236, 29, 71, 238, 31, 74, 235, 28, 68, 232, 26, 66, 237, 26, 63, 236, 25, 62;
237, 24, 60, 237, 24, 60, 237, 26, 61, 236, 25, 60, 233, 22, 59, 234, 24, 61, 232, 26, 62, 234, 28, 63, 234, 27, 65, 234, 27, 65, 234, 26, 69, 234, 26, 69, 234, 26, 73, 234, 26, 73, 237, 29, 79, 238, 30, 80, 236, 29, 71, 234, 26, 69, 237, 26, 63, 238, 27, 64]
Die Werte sind korrekt. Was Sie nicht wissen ist, dass Sie vorzeichenbehaftete Bytes verwenden, was bedeutet, dass alle roten Werte über 127 negativ sind. 240 wird zu -15 etc. Dann nimmst du zu absolut und mittelst diese. Das ist wahrscheinlich nicht das, was du willst. Konvertiere in unsigned und mittle diese. Eine einfache Debugging-Sitzung hätte Ihnen sofort gezeigt, was mit den Werten passiert. –
Wie würde ich sie in vorzeichenlose Bytes konvertieren? @SamiKuhmonen – cuber
was würde ich mit meiner Konvertierung machen? @SamiKuhmonsen – cuber