Questions tagged [image-processing]
Questions on the image processing capabilities implemented in Mathematica.
1,292
questions
0
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0answers
26 views
Setting the location of the origin within an image for AffineTransformation
This question is closely related to this one, but slightly different.
I want to perform several AffineTransforms on an image (myImage). For example, here is a ...
3
votes
0answers
41 views
UpdateInterval doesn't work with Dynamic[CurrentImage]
I work on image processing using images from webcams. It's connected via USB and I get "live" images by:
Dynamic[Refresh[CurrentImage[], UpdateInterval->5]]
...
2
votes
1answer
32 views
What's wrong with my masking in this ImageMeasurements?
I want to find the mean color of an image's region defined by a polygon, and I tried this:
...
0
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0answers
52 views
How to extract numerical data from plot images automatically?
how can we automatically extract numerical data from plot images in MMA (.dat or .csv file)?
For the test image (two curves in one image), x=[0 40]; y=[0 1]
if we use e.g. "getdata-graph-digitizer"
...
3
votes
2answers
112 views
Find gridlines in image of blots arranged in a grid
I have an image with a grid of equal separations. I would like to detect the lines in this image. I tried with ImageLines in but it does not work.
@MelaGo Thank ...
4
votes
2answers
148 views
Extract partitions of images after edge detection
Given a edge detected image like this:
I would like to extract each character into a sub-image, i.e so that each new picture only have one character. Is there a simple way of doing this in ...
2
votes
1answer
63 views
Hammer projection to rectangular
This might be more of a mathematical problem than a Mathematica'l one, but still, maybe you'd help me.
I want to write a function that would produce a rectangular image from an image with Hammer ...
2
votes
1answer
67 views
How to make a video from png images
I have a set of about 100 .png images representing the evolution of the system I am studying: how do I create a video out of these images with Mathematica?
7
votes
1answer
85 views
Detect sub figures and split (automatically?)
I would like to take a large figure showing a sequence of individual plots and automatically split the into series of images showing the individual sub-plots (to be exported as animated GIF later). ...
4
votes
1answer
145 views
+50
How to track a deformable rod in video?
I have a video of nanotubes in solution taken with a confocal laser microscope. I typically track these nanotubes with Fiesta or Fiji, but in this case, there is variation in brightness that is ...
3
votes
1answer
81 views
Convert a point in the Radon Space to a line
I need a function point2line to convert a point in the Radon Transform Space to a straight line.
But I don't know the algorithm inside mathematica, I don't know ...
0
votes
1answer
61 views
How to extract specified objects from a pdf?
Is it possible to extract some information from a pdf file?
I am interested in extracting the words before the squared brackets and the following word (in the image, for example, I would like to ...
0
votes
1answer
51 views
Image matching and transformation
I hope this picture can help me to be clearer.
The triangles represent some values of an image (EDITED: positions).
The same for the circles, but from a different image.
Some values matches, some ...
3
votes
1answer
40 views
Find the higher degree of similarity between images and report the points in common and the differences
I am trying to analyse due different images and find their similarities.
In order to do this, I need to consider the coordinates of the pixels in both images, then select the points in common, i.e. ...
2
votes
2answers
69 views
Compare two plots by finding the minimum distance among points
I have a question about comparing the points within two plots.
I would like to compare two plots and find the minimum distance among their points, in order to find the nearest/common points (i.e., ...
1
vote
0answers
37 views
Is it possible to select a number of points to highlight points in an image?
I would like to ask you how I can fix a number of points to show in a picture.
In the previous post (Is it possible to get the coordinates only for the highlighted points from an image?), JimB ...
2
votes
1answer
53 views
Is it possible to keep only coloured parts in an image, removing all the rest (in greyscale)?
I would like to know if it is possible to keep only coloured parts (for example red eyes) from a b/w image, removing all the other parts not coloured (i.e. in grayscale or black and white).
I was ...
1
vote
1answer
104 views
Is it possible to get the coordinates only for the highlighted points from an image?
I would like to ask you if it is possible to get the coordinates or a couple of numbers that can give me the positions of the highlights points (selected using HighlightImage function) in an image. I ...
6
votes
4answers
644 views
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0answers
36 views
Can LearnDistribution Train and Generate Images Without Defaulting To 256x256?
In spite of anything I try it seems the ConformImages[] function nested in the LearnDistribution[] function resizes images to 256x256.
If I convert an image into its "Data" representation before ...
14
votes
1answer
235 views
Tracking cells as they move under a microscope
I have a video (tiff file) of cells under a microscope and I'd like to segment and track the location and sizes of them across time:
It has a hundred frames:
I've uploaded it here (now it is public):...
5
votes
0answers
83 views
Recognising people from photos
I have a large number (probably 10000) of personal photos taken over the last few years, a good proportion of which contain family members.
I'd like to put together a photo book of one family member,...
1
vote
0answers
53 views
Understanding how ComponentMeasurements finds neighbors
I am trying to understand how the module ComponentMeasurements in Mathematica works when the property Neighbors is called in ...
6
votes
1answer
101 views
Is there a SubImageApply?
Given an image and a subimage (as a rectangle or pixel ranges):
img = ExampleData[{"TestImage", "Lena"}];
f = FindFaces[img]; HighlightImage[img, f]
How would ...
5
votes
3answers
141 views
Including the actual length scale of the image in processing microscopic images
Following the wonderful methodologies provided in this post, I have learned how to process microscopic images of the types shown below in order to analyze them. When it comes to analysing the size ...
6
votes
1answer
390 views
Get date and time when photo was taken
I am trying to rename few images by their date and time taken.
Is there a way to get the date and time when photo was taken using Mathematica?
1
vote
1answer
46 views
Why ImportByteArray when generate image from bytes
I was trying to generate an image from a list of bytes so I only had to Import an Image once as I want to store a Base64Encoded ...
19
votes
2answers
554 views
Creating graph out of particles images
I have recently started learning how to use Mathematica's brilliant image processing tools, and the image I've taken as first example is the following (source):
So far I've tried to first use ...
6
votes
4answers
152 views
How to count the overlapped disks in a picture?
I have several picture containing many small circles. I can manually count the circles in these pictures but it will be time-consuming and make me tired. How can I use mathematica to do this job?
I ...
0
votes
0answers
43 views
MorphologicalTransform: What is the difference between EndPoints and SkeletonEndPoints?
What is the difference between the "EndPoints" and "SkeletonEndPoints" functions of ...
1
vote
1answer
141 views
How to animate a cube with images on their faces?
From this code, how could I animate (speed given by the user) this cube at random so that each face shows me a different image.
EDIT(The idea is that the cube rotates at random and shows different ...
2
votes
1answer
81 views
Segmenting cells from a stained image of cells from microscope
I have an image which has stained cells and I have to segment all the cells.
But the problem is that the cell boundary is not very distinguished where there is staining done because of the stain.
...
2
votes
1answer
91 views
Calculate the surface area of different elements in a picture (micrograph)
This is a micrograph of a hybrid material that contains glass fiber (small white dots), carbon fibers (big grey dots) and a matrix that contains everything! I would like to calculate the surface area (...
0
votes
0answers
32 views
How to run image manipulation function to an array of images?
I have multiple images imported into an array. My issue begins with using this array for an image manipulation function such as Inpaint. Inpaint only accepts a single image at a time.
Here's how I ...
2
votes
2answers
106 views
Find Probability that Image Is Text
I can find out whether an image is text:
ImageInstanceQ[img,Entity["Concept", "TextualMatter::m7642"]]
And if an image is most likely text, I can find out the ...
8
votes
2answers
202 views
Removing horizontal noise artefacts from a (SEM) image
I've been trying to analyse some SEM images to determine grain areas and sizes. Some of my images (I've attached an example below) appear to have horizontal bands that manifest as regions with ...
22
votes
2answers
1k views
How to project 3d image in the planes xy, xz, yz?
Some idea of how to do something similar to the image, but with any 3d object
2
votes
1answer
102 views
Plotting large scale image embeddings
I'm looking for help making publication-quality graphics for visualizing 2D embeddings of image datasets, so that they look like this:
These two-dimensional embeddings of thumbnails (sometimes with ...
0
votes
0answers
43 views
How to assign an image to all the 12 faces of a Dodecahedron [duplicate]
How do i assign an image to all of the 12 faces of a Dodecahedron?
6
votes
2answers
283 views
Image processing: Removal of two spots in fundus images
I have many hundreds fundus images of the human eye.
The yellow arrow points to two spots which I I want to remove. The
final result should be a perfect circle.
The removed area should be ...
1
vote
1answer
75 views
Clustering edge points of an image?
Consider the following image
I would like to cluster the points obtained after edge detection and subsequently, would like to color the clustered edge points.
My attempt:
...
2
votes
0answers
55 views
Improving the accuracy of the bounding box detection of TextRecognize
My problem concerns the text position detection in a scan. My goal is to find the bounding boxes of the text.
...
17
votes
1answer
261 views
Repairing a panorama
I was on a cruise and the panorama I took was warped due to the ship rocking:
I'm hoping to correct this so that the horizon is level. Here's the full resolution image:
...
1
vote
0answers
51 views
Is it possible to resize an image without importing?
If we have a list of 1000 ULRs which refer to image files of the following form:
http://...file1.jpg
http://...file2.jpg
...
http://...file1000.jpg
Objective: We want to resize each image (e.g. ...
2
votes
1answer
60 views
Make outline of a image thicker
I import a jpg image in my notebook. The result is like this:
I'm interested in the outline so I wrote this code:
ColorNegate[
EdgeDetect[ColorNegate[AlphaChannel[RemoveBackground[test]]]]]
The ...
1
vote
1answer
90 views
Find outline of a cell
I have a set of images of biological cells, which look like this:
How do I find the edge of these cells in a robust way (i.e. without having to manually tweak each one. I have three images here:
<...
3
votes
1answer
112 views
Individualised test paper generation (and marking)
I would like to use mathematica to create individualised tests that can be printed out for students to complete(handwritten). I would also like to be able to generate individualised printed answers.
...
4
votes
1answer
104 views
What is the algorithm behind ImageRecolor?
I'm wondering which algorithm is implemented, given that recoloring requires a lot of assumptions to really get the desired color.
For example, coloring a dark grayscale image into a light green can ...
4
votes
1answer
133 views
Problem with InverseFourier of a 2d FFT of a non-squared image
I have the following 8bit grey scale image:
The 2d FFT of this image, showing the color coded Abs[fft] values, is:
The code to obtain the FFT image is:
...
1
vote
1answer
105 views
Convolution in Fourier domain
I am computing the convolution of a disk Img in 2D numerical matrix form with a kernel Ker in the Fourier domain but the output ...
