Answered
Delay in Plotting Next Overlaid Plot When Animating 2D Plot
You're creating a new high-level graphics object for each plot() call. That gets very expensive, and everything will just keep ...

11 months ago | 1

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Answered
Why do I write as Ib(1:478,31:565)(~BW) = 255
There are various ways, including expanding the mask, or using more purpose-built tools, but if you're trying to apply an unders...

11 months ago | 0

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Answered
How to remove 'zeros 0' from histogram so it will not affect imhistmatchn?
I'm going to guess at what's going on here. I'm assuming you're doing something like this: % a single-channel image and a logi...

12 months ago | 0

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Answered
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...

1 year ago | 1

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Answered
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...

1 year 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,'...

1 year ago | 0

Answered
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...

1 year ago | 0

Answered
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...

1 year 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-...

1 year 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...

1 year 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...

1 year ago | 1

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Answered
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...

1 year ago | 0

Answered
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...

1 year ago | 0

Answered
unable to load file in Matlab Answers
I've noticed that at least for image files, it can suffice to use the direct link to the file instead of the relative path. App...

1 year ago | 1

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Answered
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 year ago | 1

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Answered
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 year 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 year ago | 0

Answered
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 year ago | 0

Answered
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 year ago | 0

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Answered
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 year 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 year 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 year 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 year 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...

1 year ago | 1

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Answered
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...

1 year ago | 0

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Answered
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...

1 year ago | 0

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Answered
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...

1 year 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...

1 year ago | 1

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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...

1 year 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 ...

1 year ago | 0