我乘以它的轉置矩陣,我得到一個零矩陣。矩陣乘以它的轉置返回零矩陣?
我乘以其他矩陣,沒有任何問題。我試過這兩個與cvMul
和cvMulTransposed
並始終得到一個零矩陣,這是不同於預期的結果。
代碼:
CvMat *test = cvCreateMat(3, 3, CV_64F);
CvMat *test2 = cvCreateMat(3, 3, CV_64F);
for(NSInteger row = 0; row < 3; row++) {
for (NSInteger column = 0; column < 3; column++) {
double value = 0.0f;
if (row == column) {
switch(row+column) {
case 0:
value = 16.815826;
break;
case 2:
value = 1.492630;
break;
}
}
cvSetReal2D(test, row, column, value);
cvSetReal2D(test2, row, column, value);
}
}
[self printCvMat:test];
[self printCvMat:test2];
CvMat *testResult = cvCreateMat(test->rows, test2->cols, CV_64F);
cvMul(test, test2, testResult, 0.0f);
[self printCvMat:testResult];
輸出:
Printing Matrix:
16.815826 0.000000 0.000000
0.000000 1.492630 0.000000
0.000000 0.000000 0.000000
Printing Matrix:
16.815826 0.000000 0.000000
0.000000 1.492630 0.000000
0.000000 0.000000 0.000000
Printing Matrix:
0.000000 0.000000 0.000000
0.000000 0.000000 0.000000
0.000000 0.000000 0.000000
它應該是:
282.772 0.000 0.000
0.000 2.228 0.000
0.000 0.000 0.000
我從來沒有遇到過這個錯誤,但是這可能會有所幫助,因爲你還沒有提到你的openCV版本:http://tech.groups.yahoo.com/group/OpenCV/message/6750 –