OpenCV Q&A Forum - RSS feed

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python: "read out" the contrast of a JPG image

February 19, 2019, 12:45 am

Hello, I'm new to OpenCV, short to the problem: I have an object in which a JPG image is stored to be more specific a slide with black text and white background now I would like to show if there is...

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OpenCV 4.0.1 Cmake Windows does not configure correctly

February 19, 2019, 3:43 am

I am trying to build OpenCV on Win10 with VC15 x64 and Python 3.6 bindings. Python resides in an Anaconda env with Anaconda using Python 3.7 as a base. This in my output: General configuration for...

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Can we create our own haar-cascade file for multi-view face detection

February 19, 2019, 4:13 am

Multi-view face detection means human face in any angle ranging from -90 to 90 degrees as shown in the image image link: http://what-when-how.com/wp-content/uploads/2012/06/tmp35b0435_thumb22.png

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How to identify if an object is placed correctly in a groove or not

February 19, 2019, 8:15 am

I am trying to identify if an object (busbar in this case) is placed correctly in the groove of a mould or not. Please see the image for clarity. The object circled in red is incorrectly placed,...

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difference in translation from python to C++

February 19, 2019, 11:00 am

Hello I am facing hard time to undestand the difference between two algorithm that I wrote. I following code in python: import cv2 import numpy as np from scipy.stats import iqr def pfs(I): if I.ndim...

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Remove white noise between white horizontal line

February 20, 2019, 6:39 am

I currently have an image with white horizontal lines. between those lines, there is some noise that I would like to remove. I've already done Morphological Opening on the original image and the...

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mask green HSV value from HSV image

February 20, 2019, 11:34 pm

I currently have converted the BGR image to an HSV one. Unfortunately, I'm not able to mask the green HSV from my image with this code: hsv = cv.cvtColor(original_image, cv.COLOR_BGR2HSV) green_min =...

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make edges clearer in image

February 21, 2019, 4:07 am

I'm currently preprocessing a few images before I can use them for edge detection and I need to make the edges more clear so that the edge algorithm (Canny and Hough) can find them more easily without...

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Detecting bright spots and locating the center of the bright spot

February 21, 2019, 9:44 am

Hello Everyone Good Day! i am now kind of stuck on how to proceed as my aim for my project is to achieve the locating of the bright spots from different altitude which is as displayed in image5.png,...

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Bad results with calibration over multiple Images in Python

February 22, 2019, 6:07 am

I'm currently working in a Project to calibrate cameras over multiple Images. I have images of solarpowercells and my job is to correct the perspective and lens distortion of the image. ![example of...

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OpenCV Python video freezes when circle is not in frame

February 23, 2019, 10:34 am

I am using cap = cv2.VideoCapture(0) and will eventually be inserting a video stream link for my video. if circles is not None: # convert the (x, y) coordinates and radius of the circles to integers...

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Detection of Foot in video

February 25, 2019, 12:37 pm

Hi, I am looking for a help with video detection. I would like to detect a player foot when his foot touches the ground. Could you please support me? Thank you in advance.

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Replacing the Background of an image?

February 26, 2019, 2:46 am

As I wanted to Remove the background with some specific colors using python. And written some lines of codes but facing with a error. Not getting how it can be resolved? kindly please check the code i...

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waitkey fails to handle non-English keyboard input

February 27, 2019, 3:40 am

I am using opencv to build a camera function and at some point in the Python script, it uses `waitKey()` to get what key is pressed by the user. k = cv2.waitKey(1) # ESC is pressed if k % 256 == 27:...

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changing my python code to c++?

February 27, 2019, 4:46 am

def subalg_fun(self): cap = cv2.VideoCapture(1) time.sleep(2) _, first_frame = cap.read() first_gray = cv2.cvtColor(first_frame, cv2.COLOR_BGR2GRAY) first_gray = cv2.GaussianBlur(first_gray, (5, 5),...

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Building custom wheels

February 27, 2019, 9:34 am

### Question Is there any way I can build custom python wheels for opencv? ### What I have Two docker images for arm architecture that build opencv with python support. First one installs opencv in...

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Output of blobFromImage function

February 4, 2019, 2:19 am

I am using cv2.blobFromImage function to pre-process the image before feeding to a dnn for face detection. I tried to display the output of this function. What I am getting is multiple images (9...

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Installation Issues

February 27, 2019, 6:39 am

Hello, I'm using rasbian to work on a project for school and cannot get the installation correct. I've been at it for a week and I'm relatively new to compiling source. I've tried "pip install...

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Pycharm couldn'y load DLL file

February 28, 2019, 6:22 pm

![image description](/upfiles/15514067579490483.png)(/upfiles/15514067483924779.png) ![image description](/upfiles/1551406772366221.png) I have installed all requirement files for opencv for pycharm....

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OpenCV opening video stream crash

February 28, 2019, 7:32 pm

I am streaming video from a Raspberry Pi Zero to my windows PC running an OpenCV program. The devices are on the same wifi and running python. However, the video opens up for a few seconds and then...

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