Alessandro Masullo

Last seen: más de 2 años hace | Con actividad desde 2012

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Read PNG from memory buffer (without dumping it into a file)
Hello, I have some PNG images saved in base64 strings. I can easily load them into memory and decode the base64 to obtain the...

alrededor de 7 años hace | 0 respuestas | 0

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Totally crazy behaviour of figures. Axes going around through the image!
I contacted the MathWorks Support and they confirmed me that this is a bug of the R2015a version. They also suggested me a si...

alrededor de 8 años hace | 0

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Totally crazy behaviour of figures. Axes going around through the image!
Hello, I'm working on a GUI in matlab and I ended up with a really strange behaviour in my code. I manage to isolate the prob...

alrededor de 8 años hace | 3 respuestas | 0

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Hi all! I'm new to matlab. I've a problem in removing a circle object from the xray image. I've tried a few commands, but all of them are not working. help me :(
If the position of the spot is always the same, you can use the excellent function from the file exchange: http://www.mathwor...

más de 8 años hace | 0

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Hello, i'm trying to search for an area of an image.
I don't know if this solution works for you, but I would use histeq to equalize the image first, then conv2 to convolve the imag...

más de 8 años hace | 0

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How to display the Rectangles from different frames in one frame?
If you know the coordinates of your rectangles, you can simply extract each box from your image by using standard indexing: ...

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How to calculate repetition of an unknown number present in 2nd column of a 150*2 matrix?
You can use the function hist (or histc) on the second column of your matrix.

más de 8 años hace | 0

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How to detect an absent object from a mask image and remove it on the original image?
I don't know what are your general conditions and I assume your images are always slightly different from each other and every b...

más de 8 años hace | 0

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How do I remove the background from this binary image?
If you found your mask for your object, you can simply remove the background by using: image % your image mask % your ...

más de 8 años hace | 0

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how to get horizontal projection of histogram of an binary image ?and based on that how to segment of each line in the image? please suggest me
Given your image _im_, you can binarize it with im2bw: bw = 1-im2bw(image); The horizontal histogram (I guess) is the s...

más de 8 años hace | 0

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Image analysis - line to value data plotting
You can use imread to read the image. If your image is already normalized, you can use find to get the elements of the line. Bei...

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How to select x,y a coordinates from two points in image?
You can use the function max, together with ind2sub.

más de 8 años hace | 0

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i have a number of cars in 2007 per 1000 people which is 290 , how can I make forecast the number at 2014, by simple way in matlab?
years = 2001:2005; cars = 100:100:500; new_year = 2010; interp1(years,cars,new_year,'linear','extrap') As an a...

más de 8 años hace | 0

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How I can add marker names with plot function?
You can use the function text

más de 8 años hace | 0

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Loop animation with quiver plot
Every time that you want to update the figure, you need to call the drawnow function. You won't probably be able to get a framer...

más de 8 años hace | 0

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how can find matching point in two images?
I would suggest you to use normalized cross-correlation first, to get a rough estimate of the position of your object, and then ...

más de 8 años hace | 0

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How to replace RGB values
If I understood it correctly, you may simply use a linear scale. Once you read you image, you have a 3d matrix (row,col,3). The ...

más de 8 años hace | 0

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How can I create a row of numbers form 1 to 10 ?. like this [1.0000, 2.0000, 3.0000,...]?
Matlab deals with double variables by default. If you write 1, it is actually 1.00000000 If you just want to display it, you...

más de 8 años hace | 1

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Matlab is giving me multiple graphs and i'm only interested in one of them...How do i filter out the unnecessary curves that matlab is giving me?
If you go to view, plot browser, in the figure menu, you can see everything that is plotted and untick what you don't want to se...

más de 8 años hace | 1

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question about contour maps
If you have the torque matrix, you can simply use contour(torque). If you want to fill the space between lines, you can use cont...

más de 8 años hace | 0

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to read .xls file
http://uk.mathworks.com/help/matlab/ref/xlsread.html

más de 8 años hace | 1

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How to solve segmentation violation error when I call a C-MEX function which is compiled correctly?
I suggest you to run a debugger on your C file. I've never done it on GNU/Linux, but it should be possible in the same way as on...

más de 8 años hace | 0

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Printing particular rows and columns
start = data(2:end,18);

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Change the folder names from one digit to 2 digit numbers
You can use dir, sscanf, sprintf and movefile. Use dir to get the list of the folders. Use scanf to get the number of the ...

más de 8 años hace | 1

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how to integrate a function from 0 to inf?
You can, but it would require... an infinite time :) The answer mostly depends on your function. You could evaluate the funct...

más de 8 años hace | 0

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Random number not repeatable with the same seed
The number of threads shouldn't affect your script, because matlab only use it internally. If you don't use a parfor or some too...

más de 8 años hace | 0

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Problem related to automatic isolation/separation/ segmentation of each tooth from dental x-ray image
It's not an easy task. Since there is no specific edge, brightness or anything that defines the shape of each tooth, I reckon th...

más de 8 años hace | 0

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How to implement a non uniform blur?
I don't know if this would be the best solution, but what you need is basically a filter that depends on the spatial position. I...

más de 8 años hace | 0

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Quickly load and add big matrices
The problem with loading big data is not Matlab, but the speed of you hard disk. The only way to load data in a quicker way is t...

más de 8 años hace | 0

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Convert binary ROI to polygon
You can use bwboundaries to get the boundaries of a binary image. If you want to sort them, you can evaluate the centre of yo...

más de 8 años hace | 0

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Alessandro Masullo

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