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what is the most effective way of using laplacian filter
FWIW, you can change the shape parameter for the laplacian kernel. Default is 0.2. Why is that the default? I don't know. fk =...

2 years ago | 0

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Attempt to grow array along ambiguous dimension.
My guess is that either binaryFrame has 3 channels, or handGesture only has 1 channel. Either way, the expanded mask is deeper ...

2 years ago | 0

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What's on your personal MATLAB to-do list?
It's not exactly a grand project, but ... A set of tools for drawing 2D lines/shapes in a raster image (independent of IPT/CVT)...

2 years ago | 0

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How to match colorbar and countourf plot manually?
Set your caxis()/clim() values. Set your colormap length according to the number of discrete levels you actually have. x = 1...

2 years ago | 0

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How to get luminance and chrominance value from image?
You want "luminance". Let's assume we have an sRGB image. Luma (Y') would be factors = permute([0.2126 0.7152 0.0722],[1 3 2...

2 years ago | 0

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Unable to save the autoplot image in the for loop
clc clear close all pathprefix = 'C:\Users\MASHHADSERVICE\OneDrive\Desktop\armina\data\'; numfiles = 1; C = cell(numfi...

2 years ago | 0

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Why doesn't matlab have more plot colors?
I don't really care for it either,, but I should emphasize that it's not like there's some singular standard convention for colo...

2 years ago | 0

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Hi, can you help me fix my code? How can I convert this to a matrix using if/while/for statements?
Consider the example: % some data in a column vector MERfff = (21:31).'; % rearrange it [xx yy] = meshgrid(MERfff); MERfg...

2 years ago | 0

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Exporting only the plot legend to a jpg file
I don't have exportgraphics(), so I'm not going to bother with that. Consider the example: % plot some fake data yy = rand(20...

2 years ago | 0

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I am embedding pdf into an Image. But after extraction i am getting blank page pdf. How to extract the correct pdf file whatever i have inserted?
fileread() is really just a convenience wrapper for fread() meant for reading text files. Up until R2020-something, it didn't e...

2 years ago | 0

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Error: Edge function: variable might be used before it is defined
I'm pretty sure the reason that's happening is because later on in the same scope, you're shadowing the function by creating a v...

2 years ago | 1

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How to count number of only those zeros which are lying between 2 one's in a very simplified way in the given matrix?
This uses image processing tools. This is probably more expensive, but it's another idea. a = [0, 0, 0, 0, 1, 1, 1, 1, 0, 0 ,0...

2 years ago | 0

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Need help to overlay transparent red on gray scale images (or movie) using a binary mask
If you have IPT, you could use labeloverlay() % labeloverlay() supports multichannel images gray_image = imread('peppers.png')...

2 years ago | 0

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How, in the same figure tile, to prevent a second contour plot from changing the colormap of the first contour plot?
Contour plots are colored based on the current axes colormap and the mapping limits set by clim()/caxis(). An axes object only ...

2 years ago | 1

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Change opacity of basemap using mapping toolbox?
I bet there's some better way to do this, but I didn't see one. Take that with a grain of salt. I never really use mapping too...

2 years ago | 0

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mean of all these variables over latitude x longitude x time that is (5 x 5 x 2)
If your data is a bunch of individual numeric arrays: % some fake data x1 = rand(5,5,2,65); x2 = rand(5,5,2,65); x3 = rand(...

2 years ago | 0

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how to accelate the 'for loop' command' It's not end processing !!
Again, you're trying to construct large (~1.7 GB) arrays by growing them (in the reconstruction part). That will take an imprac...

2 years ago | 0

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Page-wise Diagonalization?
This isn't much, but it's one idea. The meager speed advantage falls off for small inputs. diag() is pretty fast to begin with...

2 years ago | 2

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How to speed the code? It does not want to end processing!!!!
Here's my guess. % assuming b,omega,t are all row vectors % width of Phi is equal to length of b,omega time_dmd = b.*exp(omeg...

2 years ago | 1

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I am getting wrong text file after extraction process.
Here. This writes bits in a specified bit plane, across all three channels in the order [channels, rows, columns] (i.e. as per ...

2 years ago | 0

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mean brightness values from scale of 0 to 100% of selected each 7 rectangle areas to compare mean brightness
% Load the image inpict = imread('yellowlily.jpg'); % don't shadow image() % inpict = im2gray(inpict); % better brightness met...

2 years ago | 0

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Automatic generation of multiple X vs. hh:mm:ss data from an image containing multiple plot
This probably doesn't matter anymore if you've already done what you need, but it's what I prefer: https://www.mathworks.com/ma...

2 years ago | 0

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How can I use find to create multiple variables instead of one variable that is a long vector?
I'm not sure if this is what is being asked, but: % some fake periodic data t = linspace(0,4*pi,500); y = abs(sin(t.^1.1)); ...

2 years ago | 0

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How can i generate an array of integers that is more dense around a certain value?
The example you gave doesn't seem to do what you describe. Is this more what you're looking for? M = 10000; ending_point = 0....

2 years ago | 0

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convert from hsi to rgb in matlab with out using hsi2rgb and convert from rgb to hsv in matlab with out using hsi2rgb
MATLAB/IPT do not have tools for HSI or HSL. There are multiple submissions on the File Exchange, some of which are only one-wa...

2 years ago | 0

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Group values in a vector
I'm not sure if this is what you're asking for, but: V = [1 1 1 2 2 2 3 3 3 4 4 4 5 5 5] V = ceil(V/2)

2 years ago | 0

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Answered
Calculating the area related to a specific color in colormap
You might want to double check this. openfig figure1.fig; hp = get(gca,'children'); % CData in this case is 121834x3 % tha...

2 years ago | 0

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How to create a 3-D Cardioid shape in MatLab? (a cylinder with a cardioid base)
Here's one way. % 2-Dimensional Cardioid theta = linspace(0, 2*pi); r = 1-(0.7*sin(theta)); x = r.*cos(theta)*1.25; y = r...

2 years ago | 1

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Answered
Gradient color line in geoplot3.
See this answer: https://www.mathworks.com/matlabcentral/answers/1974839-is-it-possible-to-plot-a-curve-with-changing-colours-u...

2 years ago | 0

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I am getting wrong result while extracting the text
You're writing to non-consecutive pixels based on their original values and the values of the embedded message. When you read t...

2 years ago | 0

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