Calculate overlap percent between two rectangle
It is not difficult, we just use bit operator : &, |
for more detail information, refer to below source code.
< gist >
< /gist>
9/29/2017
9/27/2017
Tip, Add 'Vector (b)' to end of 'Vector (a)'
If you have 2 Vector and you want to add Vector b to end of Vector a, refer to below code. (very simple!)
vector< int > a;
a.push_back(1);
a.push_back(2);
a.push_back(3);
vector< int > b;
b.push_back(4);
b.push_back(5);
b.push_back(6);
a.insert(a.end(), b.begin(), b.end());
int count = 0;
for (auto it : a)
{
printf("a[%d] = %d \n", count++, it);
}
vector< int > a;
a.push_back(1);
a.push_back(2);
a.push_back(3);
vector< int > b;
b.push_back(4);
b.push_back(5);
b.push_back(6);
a.insert(a.end(), b.begin(), b.end());
int count = 0;
for (auto it : a)
{
printf("a[%d] = %d \n", count++, it);
}
9/24/2017
Tip, How to count number of '0' in element of Matrix(Mat)?
As same with Matlab, we can use inequality ">,<,==,>=,<=".
Firstly, we check equal to '0' or '>0', the result is output to '255' if satisfied.
Divide by 255 then elements have left '0' or '1'
And sum all of the element, then we can get the number of zero.
Source code is here..
Mat a = Mat(5, 5, CV_8UC1);
randn(a, 0, 1);
Mat b = (a == 0) / 255;
Mat c = (a > 0) / 255;
cout << "Input matrix matrix a = " << endl;
cout << a << endl;
cout << "number of 0 = " << sum(b)[0];
cout << ", number of over 0 = " << sum(c)[0] << endl << endl;
cout << "matrix b = " << endl;
cout << b << endl;
cout << "matrix c = " << endl;
cout << c << endl;
Firstly, we check equal to '0' or '>0', the result is output to '255' if satisfied.
Divide by 255 then elements have left '0' or '1'
And sum all of the element, then we can get the number of zero.
Source code is here..
Mat a = Mat(5, 5, CV_8UC1);
randn(a, 0, 1);
Mat b = (a == 0) / 255;
Mat c = (a > 0) / 255;
cout << "Input matrix matrix a = " << endl;
cout << a << endl;
cout << "number of 0 = " << sum(b)[0];
cout << ", number of over 0 = " << sum(c)[0] << endl << endl;
cout << "matrix b = " << endl;
cout << b << endl;
cout << "matrix c = " << endl;
cout << c << endl;
Subscribe to:
Posts (Atom)
-
put a explicit parameter name like: from sklearn.utils import class_weight class_weights = class_weight.compute_class_weight( class_weight...
-
CUDA_ARCH_BIN Table for gpu type Jetson Products GPU Compute Capability Jetson AGX Xavier 7.2 Jetson Nano 5.3 Jetson TX2 6.2 Jetson TX1 5.3 ...
-
* Introduction - The solution shows panorama image from multi images. The panorama images is processing by real-time stitching algorithm...
-
make well divided linear coordinate And make pair coordinate Please see code for detail explanation. import numpy as np import cv2 ...
-
look at the code! ^^ .. #load image tif_path = './input_img.tif' #open image pil_image = Image. open ( tif_path ) #change dpi in...
-
yolo v5 data coordinate format ex) str_v = "32 0.262 0.7878 0.314 0.385" #read image cvmat = cv2.imread(img_path) #get height, w...
-
As you can see in the following video, I created a class that stitching n cameras in real time. https://www.youtube.com/user/feelmare/sear...
-
In past, I wrote an articel about YUV 444, 422, 411 introduction and yuv <-> rgb converting example code. refer to this page -> ht...
-
This is dithering example, it make image like a stippling effect. I referenced to blew website. wiki page: https://en.wikipedia.org/wik...
-
Just see the code It's not difficult. ... ... import cv2 import numpy as np ... def lambda_handler(event, context): # TODO i...