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Questions tagged [threshold]

The starting point for a new state.

715 questions
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Segment particles into black/white image

Can someone help me turn this image into a Black and White (not grayscale) image where it particles are black and the background is white? (or visa verse). It's is not as simple as thresholding the image since the background varies in intensity and…
Markus
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Thresholding a huge matrix to avoid overuse of memory, C++

I want to generate a huge weighted undirected graph, represented by a huge adjacency matrix AJM. So for the loop over i and j, AJM[i][j] = AJM[j][i] AJM[i][i] = 0 The weights are generated as random double numbers in the interval, say [0.01,…
Logan Yang
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Thresholding for tiff stack looks at entire stack instead of individual tiff image

I have a tiff stack (b/w) and when I open individual images from the stack in imageJ, the contrast is perfect, however, when i open the entire stack (image sequence of moving things), the contrast is terrible for the end slides (where fluorescence…
ingrid
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How can I make my threshold window only work for half my image?

I am using Visual Basic 2010 Express, and opencv in c++, and while this line already limits my color to track in the threshold window, inRange(HSV,Scalar(0,1,170),Scalar(196,137,256),thresholdL); I am trying to figure out how to also say 'only show…
user2760185
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if condtions for acceleomter x,y,z and gyroscope x,y,z give me a very quick result, more that i think its true

i am gathering accelerometer and gyroscope data using push methods( startDeviceMotionUpdatesToQueue:withHandler: and startGyroUpdatesToQueue:[NSOperationQueue mainQueue] I compare these raw data with certain thresholds, if it satisfies the…
Dina
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as3 BitmapData threshold, what happens to pixels that fail the test? How to remove them?

When i use bitmapdata threshold, what happens to the pixels that fail the threshold test? As per my observation they remain as in, so is there any way to remove them?
Netrus
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Differences between Otsu Threshold, SIS Threshold, IterativeThreshold? (Theoritically)

Tried googling the pros and cons ( advantages and disadvatnges of OTSU, SIS, and Iterative Threshold ). But was unable to find a clear answer. To be honest, this is for a small assignment where I have to compare these three thresholding techniques…
hirosht
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MRTG ThreshPro is only one time. Not runs every 5 minute

I have setup MRTG-rrdtools-routers2.cgi and setup working fine and happy as a beginner :) I have set 'ThreshDir:', 'ThreshMinI' and 'ThreshProgI' in MRTG cfgs. At the first run my script in 'ThreshProgI' is run without any issue but it not going to…
Yasiru G
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New Relic RESTful API: Returning aggregate data for the entire site in a custom time series

I have this API call to return aggregate day for my entire site, but the begin data and end date for wha the call uses do no seem to be configurable. Is there any way to configur a begin date and end date for this API call? Are there any custom…
Edward Granger
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HSV conversion with cvCvtColor() issue

I'm trying convert RGB image to HSV with the function cvCvtColor(), but the results are unexpected. For example, white are converted to something near to red. cvCvtColor(img, hsv, CV_BGR2HSV); cvSplit( hsv, h, s, v, NULL ); …
renandame
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Preparing data set for volcano plot in R

I have the following dummy data set: MYdata = data.frame(fruit = c("apple", "apple", "apple", "apple", "apple", "apple", "apple", "pear", "pear", "pear", "pear", "pear", "pear", "lemon", "lemon", "lemon", "lemon", "lemon", "orange", "orange",…
Dalmuti71
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Rosin thresholding (Unimodal thresholding) JAVA

I have to do for my project many image filters (all you can imagine) in JAVA (I use JAVA JAI). I have done all except unimodal thresholding by Paul L. Rosin. I found only this document and implementation on c++. Unfortunately, I'm terrible in c ++.…
Samot
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emguCV getting the largest blob

i'm working on color tracking.. and i'm specifically tracking an orange ball, a basketball ball perhaps, along with kinect for the body, i'm making a free throw shooting guide. here's my case i have already thresholded my image, eroded it to remove…
muffin
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Find out the date a cumulative sum value is reached

I have three tables. Properties property_id Reservations: reservation_id reservation_property_id reservation_date Payments payment_id payment_reservation_id payment_amount A reservation can have many payments associated with it and a property can…
eski009
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histogram tile values in matlab

I am doing a project on 'moment preserving thresholding'.. in that after doing certain operations we get certain values for p(p0,p1,p2,p3...) and the output(threshold value) is found from the histogram of the image, choosing threshold as the …
user2081934
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