# Questions tagged [image-processing]

Questions on the image processing capabilities implemented in Mathematica.

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91 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: <...
115 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. ...
109 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 ...
153 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: ...
111 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 ...
63 views

### How to get Binarize to ignore already set background

I have grayscale images which contain a clear foreground and background, which Binarize is easily able to split out. Then within the foreground, I want to binarize again, to find the area around the ...
355 views

### Prevent background segmentation in watershed transform based on marker

I like to reproduce this accepted answer from stackexchange in MMA. While I would like to achieve a better segmentation than what I already got, at the moment my main problem is that the background is ...
63 views

### Converting video file to list of images to analyze pixels of each frame

I am trying to recreate the following physics experiment to analyze chaotic motion: https://www.researchgate.net/publication/275890532_Tracking_the_Motion_of_a_Double_Pendulum_Using_Mathematica I ...
125 views

### Hyperspectral files in the ENVI format?

Have any of you had the pleasure of reading geospatial / hyperspectral files in the ENVI format? Headers that describe the data here, https://www.harrisgeospatial.com/docs/enviheaderfiles.html which ...
62 views

### GaussianMatrix algorithm details

GaussianMatrix[] supports a Method -> "Bessel" option which the documentation describes (in the Details section) as: With ...
78 views

### Join grayscale image with matrix plot

I have a 200x200 grayscale map map = Image[data, "Byte"] together with a matrix plot ...
71 views

### Pixel-wise image manipulation

I downloaded an image from a website and imported it to Mathematica ...
60 views

### Extract plot from an image with diffused lines

I found an amazing question on how to obtain a data set from an existing plot, which detailed the process very nicely. Recreated the same steps on my end but it's not working, I am assuming because ...
130 views

### Detection of regions in image

I have this image: I would like to separate qualitatively 4 different regions into approximately such an image: The colors or gray shadings of the regions do not matter. How can this be achieved ...
2k views

### Can Mathematica be used to create an Artistic 3D extrusion from a 2D image and wrap a line pattern around it?

So here's somewhat of the general goal first: Here's an example of image-based line patterns Here is an example of an artists work in creating imagery using only lines bent as though distorted by an ...
49 views

### Changing the origin of the coordinate system aligned on an image when using the ImageFowardTransformation function

When using the image transformation command ImageFowardTransformation[image, function] the pixels of the image you input are in cartesian coordinates that by ...
206 views

### Another difficult background subtraction

I'm trying to remove the background but it is removing part of the bag in the foreground (because it is white too): Here's what I've tried: ...
104 views

### How is that distance between images calculated?

The command ImageDistance[Plot[x^2, {x, 0, 1}, PlotRange -> {0, 1.01}], Plot[x^2 + 0.01, {x, 0, 1}, PlotRange -> {0, 1.01}]] produces ...
210 views

### Adding white noise to a signal of two variables

When a signal depends on two variables, e.g., f[k1_, k2_] := Exp[I 0.75 (k1 + 0.3 k2)] + 1.5 Exp[I (0.2 k1 + 0.3 k2)] + Exp[I (0.2 k1 + 0.4 k2)]; where ...
133 views

### Creating a numerical table of values and using an interpolation of them to transform pixels in an image by the ImageTransformation command

I am trying to carry out point "Implementing Map" on this paper Interstellar wormholes however I am using my own equations not those given (only the same method). I have generated a list of values ...
124 views

### Creating a numerical table of values from an interpolating function resulting from NDSolve [closed]

I am trying to carry out point "Implementing Map" on this paper Interstellar wormholes however I am using my own equations not those given (only the same method). Part 1 I am trying to create a ...
75 views

### ImageRestyle yielding low-level errors even in example cases

the title covers it. I'm on v11.3.0.0 on a MacBook Pro running Mojave 10.14.2, and trying to run ImageRestyle seems to immediately throw a bunch of errors that aren't related to the input in an ...
112 views

### Robust face detection

FindFaces doesn't work when people are far away from the camera. I'm looking for a single accurate method of detecting one or more people in an images, at all ...
114 views

### Remove background image and redraw lines in black

I do not know if the title is correct. The image that I upload has liked me a lot because of the characteristic that no matter the angle it seems that it is looking at you, you could indicate me how ...
78 views

### Automated calculation of tree branches radius from thinned image

I am progressing in the branching problem described here. After having extracted my tree structure and done a lot of manipulations on it (very interesting, but not described here), I would like to ...
87 views

### Using Image Transformation to create image sky view of what its like to be near black hole (Not a wormhole) [duplicate]

Question : I am trying to carry out point 3. "Implementing map" on page 13 in the paper Interstellar wormholes using my own equations not those in the paper. however am not 100% sure on how to go ...
255 views

### How to create this doge fractal zoom?

I would like to learn how to recreate this fractal in Mathematica and make others in the same style: https://m.imgur.com/r/FractalGifs/lYEK8Cd
144 views

### Why does Fourier give me a different picture than ImagePeriodogram?

I want to take a 2D fourier transform of some data, but when I try this I get unexpected results. When I use ImagePeriodogram I get something that looks like I ...
410 views

### Branching points detection in processed image

I want to get the branching coordinates from a computer-generated image like this one: After SkeletonTransform and Pruning, I ...
117 views

There have been many posts about generating and cracking Captchas. However, I have never seen a post or answer concerning one the more recent versions of re-captcha images - a "word morphing effect" ...
99 views

### Logarithmic brightness enhancement of an image [closed]

I have the following 8bit grey scale png image: Two examples for brigthness enhancement are: ImageAdjust[image, {0, 5}] ...
67 views

### How to Invert MorphologicalComponents?

It's actually the same question as here: Identify circles in Image and make list of all diameters ...but I cannot get it to work properly for this specific case, so I would be pleased for some help. ...
54 views

### Image to coordinate system

May I kindly ask you to teach me how to align the symmetry axis (in blue) of the attached picture along the Ox and/or Oy axis. The axis of symmetry is slightly off (rotated to the right). In other ...
207 views

### Efficient multicolor search

I'm hoping someone can help me improve the following fun code-snippet, which takes a target color and searches through a set of images to find the ones that most closely match: ...
105 views

### Savitzky–Golay method to find the first derivative [closed]

I have a list of positions as a function of time data and want to apply the Savitzky–Golay method to find the first derivative. What is the approach I should take. I already know how to apply the ...
947 views

### Detecting the outer edge of an object in an image

I am trying to extract the outer edge of the attached image. Could you please advice me how to do it?
69 views

### How to prevent or clear the cache used by ComponentMeasurements

Let's restart the kernel and take the first example from ref/ComponentMeasurements: Timings indicate some kind of caching mechanism. It seems useful in many cases. ...
831 views

### How to convert a 4-channel image to 3-channel image in an elegant way?

I have a 4-channel image (RGBA). I want to reduce its channel count from 4 to 3. The method I am using currently is to Right click and Save as a .png file. After ...
98 views

### Is it possible or how to extract message string from binarized list?

Given message copied from Silvia's profile page, a binarized list could be found bellow. ...
1k views

### How can I make a graph network from image of granular packing?

I have an image from experimental data of granular packing. I need to characterize the packing as a network. The network consist of node (center of granular particle) and edge. Two node are connected ...
86 views

### Manipulation of 2d images, position, alignment and scale

I'm new to Mathematica and I am trying to generate an array of rectangles which stays perfectly aligned and scaled correctly and able to control the opacity of each one. Could anyone point me on to ...
501 views

### Fill in an incomplete outline of an image

I have an outline which I have extracted from an image, which may well not entirely closed, for instance: I now want to fill the inside of this, as another image, using the convex hull if it is not ...
47 views

### Extract data (digitise) from graph with various line formats

I am attempting to extract the data points from the graph below: -axis titles and axis lines are removed for digitising simplicity- I have tried using a range of graph digtisers (i.e. datathief, ...
89 views

### Roulette Ball Tracking with Mathematica

There is an image from roulette spin video, and I have a code to track the ball position on the image (*Mask is a visible ball track on the rim*) ...
33 views

### Real-Time Image Processing [duplicate]

There is a code from wolfram Documentation Center ...
105 views

### How can one get the axis of symmetry of the following egg profile [closed]

This is the binary version of the profile of an egg. Would you be so kind and let me know how to get the axis of symmetry of this profile. Thank you!
94 views

### Blend modes for composing images?

I'm looking for a way to combine two images with standard image blending methods like Darken, Color Burn, Color Dodge, Soft Light. Is there a way to achieve these with ...
146 views

### How to find the rectangle with those text

In this image: I want to find this rectangle with all contents(without those grid's lines) I think the total of the pixels can help a little like: ...