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Questions tagged [threshold]

The starting point for a new state.

715 questions
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Threshold Error for few numbers, but not for others

I was trying to use the contours of and image, and when I tried the following it gave and error. I know for sure that it is because of the 24, because I used another number such as 45 and it would accept it. The rest of the code is okay, that's why…
David Nichero
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How to set threshold values in a numpy array?

I have an array of values and I want to set specific values to integers. Anything below 0.95 set to 0, anything above 1.6 set to 2. How can I set everything between 0.95 and 1.6 to 1? n1_binary = np.where(n1_img_resize < 0.95, 0,…
rzaratx
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How can I apply the hough circle method to a thresholded image?

I currently have a program that can detect colored balls with openCV and I'd like to add the HoughCircle method to make it better. I had the idea to apply the HoughCircle method on the thresholded image that i got from the inRange method but…
leo0617
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Azure application gateway unhealthy threshold

What does the unhealthy threshold in the Azure Application Gateway configuration represent
Siddarth Rokkam
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Top score from multiple lists

I have a list of lists containing KeyValuePair, sorted on the double, where the int stand for the ID and the double for the Score for that ID. I would like to create an algorithm that gives me the top-k of IDs where the sum of the IDs…
D haverkamp
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Thresholding matrix

I'm trying to apply filters to a large matrix. The matrix "logcounts1" consists of 8978 rows and 4 columns. The filter should be applied per row, so I could then select those rows in which at least one value is out of the interval. The filter makes…
Fernando Delgado Chaves
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Print cases with correlations above a threshold

I have a relatively large correlation matrix (77x77). I need to identify cases with correlations above |.60|. Below I produced the correlation dataframe and made all values < |.60| show as NA. cor_relation = cor(mydata, use="all.obs",…
PsychometStats
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Thresholding an image in OpenCV using another image matrix of pixel standard deviations as threshold values

I have two videos, one of a background and one of that same background with a person sitting in the frame. I generated two images from the video of just the background: the mean image of the background video (by accumulating the frames and dividing…
user4028648
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Find column number that satisfies condition based on another vector

I'm trying to train a classifier for the classes "Hit", "Miss" based on the variables User, Planning Horizon, Material, and some more. Most of them are categorical variables except for Planning Horizon (integer) I have unbalanced data so im trying…
user3639100
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How to get correct threshold level for CFAR (Constant False alarm algorithm)?

I have taken fourier transform for a sinusoidal signal (with noise added). I have to pass the values to the CFAR algorithm (a function) and get back the threshold values in my main matlab file. After getting the values I plot the same and I get a…
Sack11
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cumulative distribution function, threshold, R

I have daily values of runoff over a period of one month and one specific threshold. How can I find out on how many days the probability is more than 50% that the runoff exceeds that threshold? Am I right to use the CDF here? But how can I integrate…
N_ni
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raster buffering with values within a given condition in R

I have a raster file containing temperature values and a list of coordinate points as centers of my desired buffers, colored in red like in the figure: How can I extract buffers around the centroids containing all the neighbor cells matching the…
ADM
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Threshold function does not work OpenCV C++

I just want to do convert a gray image to a binary image. But threshold function gives me a totaly black image as a binary image. I want to get dark gray object. What is wrong here? Code: Mat theFrame = imread("C:\\asdsss.png"); // opencv Mat…
ffttyy
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R values under threshold

I have a daily time series of wind speeds and I would like R to return the average and maximum length of consecutive days beneath a certain threshold. Example (Threshold = 2 m/s): df > date wind_speed 1970-01-01 1 1970-01-02 …
ChrM
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Retaining and identifying elements in an array which satisfy a threshold in MATLAB

I have a matrix (about 342 by 342) denoted by C_{ij} and I want to identify all indices i,j which satisfy the condition C_{ij} > rho where rho is some fixed value. I am using MATLAB For example, if I have the matrix C_{ij} as: C = 1 0.7 0.8 …
Ansh
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