DGM

Last seen: Today | Active since 2015

Followers: 11 Following: 0

Hi, I'm nobody. I don't belong here, but I have nothing better to do. Matlab used to be part of my work. Now it's part of my hobbies. That's pretty sad, really.

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How to fill a large hole?
I don't have the original image, but I'm going to assume that your image is RGB. Use im2gray() to make sure that the incoming i...

4 days ago | 1

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Extract individual curve from a multiple curve plot
This is the garbage I put together. It could stand to be cleaned up, but it still has problems. It seems to sort data and fill...

5 days ago | 0

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Extract individual curve from a multiple curve plot
This is probably fragile and overcomplicated, but eh. % the data load data.mat x = data(:,1); y = data(:,2); %scatter(x,y,'...

7 days ago | 0

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Drawing bounding box onto an image without imshow and hold on ...
Just because I felt like doing it my way. % any image inpict = imread('peppers.png'); % some 2D logical mask of the same p...

12 days ago | 0

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How can I change each pixel value in a cluster using k-means algorithm to different colors
Create a label array from the segmentation. Create a color table associating each label to a desired color -- either the mean c...

21 days ago | 0

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how to crop a binary mask to remove all black pixels while maintaining the largest area of white pixels?
Using this tool from the FEX: https://www.mathworks.com/matlabcentral/fileexchange/71491-largest-inscribed-rectangle-square-or-...

22 days ago | 0

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how to crop a binary mask to remove all black pixels while maintaining the largest area of white pixels?
Another way. This is essentially the same as Walter's example, but it's rolled up as a convenient function. It can crop simple...

22 days ago | 0

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How to give Gray color histogram gray shade instead of blue
I slightly disagree with using the bar/stem colors to denote the color represented by each channel. It's nice to color-code thi...

23 days ago | 1

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Analyze intensity of a specific region.
If you just want basic color statistics within a region: % a color image inpict = imread('image.jpeg'); % reduce it to some...

24 days ago | 0

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How to map each pixel in the image from the colour bar and assign temperature to the pixel from the colour bar
There are now quite a few examples of this on the forum. Here's another. % the image inpict = imread('image.jpeg'); imshow(i...

28 days ago | 0

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How to count the amount of small squares in this picture?
The given answers have problems with accuracy. One way to help with discrimination is to do some sort of template matching. ...

1 month ago | 1

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How to randomly select the datapoints in a vector based on percentage for each group?
There has to be a smarter way than this, but I guess this is one idea. % some fake data x = randn(1000,1); % the percentile...

1 month ago | 0

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Digital image processing.
It's not clear what is expected by rotating an image without changing its size or resolution. What does "size" mean in this con...

1 month ago | 0

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Error in computing median filter and histogram equalization on an image. How can i solve it?
The image is a JPG, and most JPGs are RGB. fname = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/280425/1a.jp...

1 month ago | 0

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how to remove error ??? Error using ==> iptcheckinput Function MEDFILT2 expected its first input, A, to be two-dimensional. Error in ==> medfilt2>parse_inputs at 109 iptcheckinput(a, {'numeric','logical'}, {'2d','real'}, mfilename, 'A', 1); Error i
The image is a JPG. Most JPGs are RGB. Medfilt2() only accepts a single-channel input. You either need to make the input sing...

1 month ago | 0

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How can we apply a gaussian noise to a image?
If you want to add Gaussian noise to an image, just use imnoise(). That way, there's no need to jump through extra hoops to deal...

1 month ago | 0

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How do i zoom imhist?
I see two potential needs here. Scaling YLim and possibly scaling XLim Adjusting YLim: The most common is probably a need t...

1 month ago | 0

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How to create axes in the center of an image and calculate angles between the points in an image?
There's no need to use manual transcription of a plot. Use the points that have already been found. Here is a hypothetical rec...

1 month ago | 0

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Average distance between nearest neighbors of grain boundaries
Maybe a start, maybe not: % the image as a logical mask inpict = imread('unettestfile.png')>128; % if we're not going to fi...

1 month ago | 0

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Why does imagesc show different outputs for the same input matrix?
The problem is the ydata spacing is not uniform between the two sets. Tools like image(), imagesc(), and imshow() don't use all...

2 months ago | 1

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Controlling colors in scatter plots
This is what I threw together, but there's probably a better way to do this; I haven't really used gscatter() for anything befo...

2 months ago | 0

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Big Tiff Grayscale image looks unsharp/ Grayvalue is not shown properly
It's hard to know without seeing the image. A TIFF can contain just about anything. It can be on an odd numeric scale. It can...

2 months ago | 0

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Are there MATLAB functions or scripts to perform boolean operations on triangulated solids?
If your solids can each be expressed as a manifold STL, then I don't see why you can't use external tools to do the job. I norm...

2 months ago | 0

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Answered
Finding contiguous regions of interest in a mask and calculating the mean values of those regions when the mask is applied to an array
You have a mask and a (assumed) grayscale image. Here are three ways: % a grayscale image and a logical mask of the same geome...

2 months ago | 1

Answered
Can I digitized color map into contour values according to it color bar?
No, not accurately. There are a number of problems. You can try anyway. Filled contour plots are ambiguous. The only parts...

2 months ago | 1

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Answered
capture focus change of a figure
This is based on the examples given in the comments. I've tested it in R2015b and R2019b, so I'm assuming it would have worked ...

2 months ago | 0

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How to move figure window to front of all programs?
If you want the window to stay on top even if other windows are given focus, you can set that in the window manager. % you have...

2 months ago | 0

Answered
image edge detection result
There are some tools for creating DXF files https://www.mathworks.com/matlabcentral/fileexchange/33884-dxflib ... but they're ...

2 months ago | 0

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Answered
How can the objects touching the boundary of the ROI polygon in an image be removed in Matlab?
You might want to use imclearborder(), but that's not what imclearborder() does. If you have logical masks, then: % say you ha...

3 months ago | 0

Answered
decoding of bitstream in image processing?
There are four possible transition states, but only three are (confusingly/incorrectly) described. Assuming the following: a 0...

3 months ago | 0

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