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Questions tagged [threshold]

The starting point for a new state.

715 questions
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Aggregate count of timeseries values which exceed threshold, by year-month

I am now learning R and using the SEAS package to help me with some calculation in R and data is the same format as SEAS package likes. It is a time series require(seas) data(mscdata) dat.int <- (mksub(mscdata, id=1108447)) the heading of the…
Lam
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Error in implementation of local thresholding in Octave

I'm trying to implement the Sauvola & Pietaksinen method to perform a binarization in an image via local thresholding. The method defines the threshold of each pixel (x,y) as T(x,y) = mean(x,y)*[1+k(std(x,y)/R-1)], as in the arcticle ”Adaptive…
gcolucci
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Error using colfilt function in MatLab/Octave

I'm trying to run a customized filter through an image, using the colfilt function. This filter basically runs a window nxn through the image, and replaces the central pixel by the half of its minimum and maximum sum. This is what the code looks…
gcolucci
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Imagej getting a summary to be displayed and extracting its values

I am trying to build a simple java app, which would count particles and then display their number. I am using imagej (ij.jar) library, everything works perfect until the little box with result is supposed to be shown. COuld anyone pease explain to…
sdgaw erzswer
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OpenCV4Android - Threshold Error

I have an image converted to CIELAB here. It works fine. However, when I conduct Thresholding using the Otsu method. //convert to Greyscale Imgproc.cvtColor(ImageMat, ImageMat, Imgproc.COLOR_RGB2Lab); //threshold Imgproc.threshold(ImageMat,ImageMat,…
John Anthony de Guzman
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Solr Query - Set a threshold match percentage for my search

I am using Solr - Lucene 4.0. I am trying to run a query to search a field called Names. An example of a query would be: Names:George When I execute the search with the amount of rows to return to 1000 it returns 1000 results. I expect it to return…
Tobias
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How to set threshold of random data

I have a set of values randomly distributed in interval [a, b]. How to set a threshold a < c < b such that 80% values of this set are in [a, c]? Supposed that a = minimum value and b = maximum value of this set.
user2863620
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Choosing the best threshold while computing the confusion matrix?

Is there any way of choosing the best threshold while computing the confusion matrix so that number of false positives and false negatives get minimized (to get the best possible combination)? Till now I have tried changing values of threshold…
user3664020
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Detection of loudness of sound in android

I have written an app that records the sound of your environment using the built in microphone. I am trying to use this recorded data so that I can differentiate between loud environment sound and low environment sound. I have tried a Fourier…
user3148594
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how to make sure whether this number is reasonable to pick the exceptional value out?

As the title said, now I have a group random values from 1 to 3000. And I have a threshold 412.53. I want to know how to make sure this number can be threshold like normal distribution or any other statistics methods to pick some exceptional values…
Linjiong Cai
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collect and using percentage for setting thresholds on filesytems

I currently have collectd 5.4 installed on my linux host and attempting to use percent to trigger a notification when the threshold has been exceeded but it doesn't appear to work. The threshold for CPU does work however. My current config: …
user2581889
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Thresholding algorithm - positive and negative threshold?

I recently posed a question on how to implement an algorithm which adaptively changes a threshold in real time, so that a time series reaches that threshold every N seconds. I was told that if my time series has a constant time interval (it does), I…
user1566200
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How to search through sequentially numbered matrix variables in R

I have a question pertaining to R. I have some sequentially numbered matrices (all of the same dimensions) and I want to search them all and produce a final matrix that contains (for each matrix element) the number of times a defined threshold was…
user3453009
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threshold between 3 color in line charts of highcharts

I have to do a line charts with threshold y=5 where y>5 circle color is green y<5 circle color is red and circle y=5 circle color is orange. Using simple threshold i can draw only 2 color in red and green but i can't do the orange one. { …
user3703426
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Is it possible to get a "push" when number of messages reaches threshold?

I want to check What is the best practice to get the number of messages in a queue. I know I can get it via queue.getMessageCount() I also know that you can get it as the monitor plugin gets it. is it an http request? or with the rabbitmqctl…
Bick
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