threshold Questions
1
Solved
I'm trying to use OpenCV's cv::threshold function (more specific THRESH_OTSU), only that I'd like to do it with a mask (any shape), so that the outside (background) is ignored during calculation.
...
2
Solved
I'm trying to analyse some images which have a lot of noise around the outside of the image, but a clear circular centre with a shape inside. The centre is the part I'm interested in, but the outsi...
Accordant asked 22/7, 2015 at 5:0
0
I am get stuck in middle of Solr. I need only most popular words w.r.t query. I have used phonetic filter on both index and query but here the problem is that it is giving too many terms. I need on...
Pharaoh asked 16/12, 2014 at 10:50
2
I'm tried to use both of the methods but it seems like Adaptive threshold seems to be giving a better result. I used
cvSmooth( temp, dst,CV_GAUSSIAN,9,9, 0);
on the original image then only i ...
Plating asked 18/3, 2014 at 4:55
1
Solved
Java doc says - When the number of entries in the hash table exceeds the product of the load factor and the current capacity, the hash table is rehashed
In below program -
HashMap<Integer, Str...
Oscar asked 14/11, 2014 at 7:0
3
I have a code that turns a bitmap that has the grey colors into a bitmap of black and white colors, using this code:
// scan through all pixels
for (int x = 0; x < width; ++x) {
for (int y = ...
Outdo asked 29/3, 2014 at 13:23
3
Solved
I have a fairly blurry 432x432 image of a Sudoku puzzle that doesn't adaptively threshold well (take the mean over a block size of 5x5 pixels, then subtract 2):
As you can see, the digits are sl...
Demi asked 15/11, 2012 at 3:18
3
Solved
I am trying to implement the niblack thresholding algorithm which uses the formula:
pixel = ( pixel > mean + k * standard_deviation ) ? object : background
where k has standard value 0.
Could...
Interplanetary asked 26/3, 2012 at 11:14
3
Solved
Instead of finding all the samples / data points within a list or an array which are greater than a particular threshold, I would like to find only the first samples where a signal becomes greater ...
2
Looking to create a bar chart with an irregular, colored threshold field in the background, so that each data point has its own individual set of min/max thresholds, which ultimately would look som...
2
I write a classifier (Gaussian Mixture Model) to classify five human actions. For every observation the classifier compute the posterior probability to belong to a cluster.
I want to valutate the ...
Corliss asked 19/10, 2012 at 18:26
2
Solved
I'm trying to implement adaptive thresholding algorithm by Derek Bradley using Android. But it is returning black pixels all the time. Here is my code snippet. Please suggest me about what should I...
Galengalena asked 7/2, 2013 at 18:42
1
I am working on a face recognition project. I have pictures with different lighting so I need to do illumination normalization. I read a paper which which claims to do illumination normalization. T...
3
I have following problem with my Sharepoint website. (The view cannot be displayed because the number of lookup and workflow columns it contains exceeds the threshold (8) enforced by the administra...
Schizomycete asked 8/1, 2013 at 19:49
1
I have the following function containing some odes:
myfunction <- function(t, state, parameters) {
with(as.list(c(state, parameters)),{
if (X>20) { # this is an internal threshold!
Y <...
1
Solved
I am creating an Android game that uses touch input. I noticed that, when I put down a finger and move it, there is a threshold of a couple of pixels until the first MotionEvent.ACTION_MOVE is gene...
4
Solved
How can I threshold this blurry image to make the digits as clear as possible?
In a previous post, I tried adaptively thresholding a blurry image (left), which resulted in distorted and disconnect...
Delineator asked 30/11, 2012 at 5:4
3
Solved
I'm a tad confused here. I just started on the subject of Neural Networks and the first one I constructed used the Step-Activation with thresholds on each neuron. Now I wan't to implement the sigmo...
Nystrom asked 13/9, 2012 at 11:43
1
Solved
I have a png image with a white background which I'd like to turn transparent. This is fairly simple with this command:
$ convert image.png -transparent white image-trans.png
However, if the whi...
Boring asked 16/7, 2012 at 17:59
3
Solved
I have a bunch of Petri dishes full of dots which I'd like to count in Matlab. Can this be done reliably and in batches?
E.g. This plate has 352 colonies
I've tried ImageJ but need to do quite ...
Mufinella asked 31/3, 2012 at 9:55
1
Solved
I'm trying to find effective binarization techniques for document images. I've currently implemented the niblack and sauvola thresholding algorithms and tried binarization based on histogram ...
Monet asked 30/3, 2012 at 5:13
3
Solved
My aim is to detect the vein pattern in leaves which characterize various species of plants
I have already done the following:
Original image:
After Adaptive thresholding:
However the vei...
Disjuncture asked 8/3, 2012 at 12:59
2
Solved
I'm working on tracking objects based on color and I was using EmguCV library to threshold my color image to binary black and white image. Thresholding itself was quite fast, 50 ms on 320x240 image...
Unflinching asked 8/3, 2012 at 18:33
2
Solved
I have this gray video stream:
The histogram of this image:
The thresholded image by :
threshold( image, image, 150, 255, CV_THRESH_BINARY );
i get :
Which i expect.
When i do adaptive...
Gatian asked 29/11, 2011 at 18:6
2
I have 8-bit greyscale TIFF images that I want to convert to Monochrome using a 75% white (decimal 190) threshold. In the Image.convert(mode) method section, the PIL manual says:
"When translati...
Kayser asked 26/6, 2011 at 16:42
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