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Questions tagged [threshold]

The starting point for a new state.

715 questions
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Applying Threshold to Matrix Within Cell Array

I have a cell array called output. Each cell within output contains a 1024 x 1024 matrix. I would like to threshold each matrix so that elements below a given value are set to NaN. I tried using: output(output < 100000) = NaN; However, I feel that…
itend
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LabVIEW automatic threshold

Automatic threshold using inter-class variance is described in the NI vision help as shown in figure below. My question is what is the difference between the last two equations; they are exactly the same. what do they indicate ? snap from the…
ahmed kotb
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Select and plot value above a threshold

I have a plot in which there are a few noise components. I am planning to select data from that plot preferably above a threshold in my case I am planning to keep it at 2.009 on the Y axis. And plot the lines going only above it. And if anything is…
Matlaber
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How to aggregate POSIXlt by day to find daily peaks?

I have a variant of this question: Count values in a data set that exceed a threshold in R: I have some temperature measurement at almost random time intervals. I want to find out on which (how many) days a specific threshold value had been exceeded…
U. Windl
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powershell if -gt script not working correctly results always in above limit

please help me, my powershell script somehow doesnt see the correct value and always reports to the email adress even if the space is less then the threshold. $PSEmailServer = 'spamtitan.domain.nl' $username = [Environment]::UserName…
IIIdefconIII
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Python OpenCV 3.x use threshold in LBHP algorithm

I wrote a Face detection script with the LBPH algorithm (in Python) cv2.face.createLBPHFaceRecognizer(). My problem is any other person that the algorithm is not trained on, returns me my number. (If it is me it returns 1 but if it's an other person…
Flajt
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Thresholding in luminance image

I have an image that contains an illuminate. First I crop the area which I want to process then convert it into the binary image. I use Otsu's thresholding, but it gives a bad result for this problem. I have to try to use adaptive threshold, but…
Hendra
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Need help Threshold Image in JS

i have the next codepen which works good:
var width, height var step = 0; var canvas =…
Lenny Lip
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MATLAB transfer function which use custom threshold?

Is there any MATLAB transfer(activation) function which its threshold could be set in desired value? (which mean we could for example set its threshold to a value, so if sum of weighted inputs was greater than a, neuron will fire and in other cases,…
Jewen
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How to set the max requests that the snmp agent can respond in 1 min.

i want to restrict the number of requests that SNMP agent accepts in 1 min. for example , the SNMP agent can respond the requests from different management station, and i want to set the max number of the requests in 1 min. if in 1 min, the agent…
arianwang
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Best approach to eliminate oversegmentation in Watershed algorithm to enhance edges?

I am trying to implement the Watershed algorithm for image segmentation. I applied in the pre-processing phase Median filter and Morphological Gradient, but the results are way too over segmented as seen in the pictures above. After some research on…
lightstar
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Elkstack Logstash - How to send a threshold alert by email

I need some help with Logstash. I currently have the below Logstash config which works. When the [message] tag has "Token validation failed" in it it sends an email out saying auth issue. input { tcp { codec => "json" port => 5144 …
user3290171
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adaptiveThreshold getting blank (full white) image

I want to apply adaptiveThreshold using open cv library to my bitmap image, but once i do with following code, it shows blank (full white) image, please help me to resolve it. following is code: Mat grayMat = imread(getImageUri(this,…
Appstute
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Set the Threshold value in the Output from the FCN

I've been trying to use FCN to segment medical images. In the Evaluation part, I need to transfer the output of the network into a binary matrix with a threshold. I tried to use cv2.threshold pred_bin =…
sean shen
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Matlab picture intensity level adjustment

I have a specific question to ask about the intensity adjustment for image processing. I need high constraint value to find small gaps in the image which is shown as a red circle in the image. I used a manual threshold value 0.99 to convert the…
Chen
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