Questions tagged [image-processing]
Questions on the image processing capabilities implemented in Mathematica.
5
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0answers
52 views
GaussianMatrix algorithm details
GaussianMatrix[] supports a Method -> "Bessel" option which the documentation describes (in the Details section) as:
With ...
0
votes
1answer
62 views
Join grayscale image with matrix plot
I have a 200x200 grayscale map map = Image[data, "Byte"] together with a matrix plot
...
0
votes
0answers
53 views
Pixel-wise image manipulation
I downloaded an image from a website and imported it to Mathematica
...
3
votes
1answer
40 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 ...
0
votes
2answers
96 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 ...
16
votes
4answers
1k 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 ...
0
votes
0answers
28 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 ...
3
votes
3answers
148 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:
...
-3
votes
1answer
88 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 ...
0
votes
1answer
97 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 ...
0
votes
1answer
95 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 ...
0
votes
1answer
84 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 ...
1
vote
0answers
66 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 ...
0
votes
0answers
65 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 ...
0
votes
0answers
100 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 ...
3
votes
1answer
68 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 ...
2
votes
0answers
81 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 ...
6
votes
3answers
160 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
4
votes
1answer
104 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 ...
7
votes
2answers
365 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 ...
7
votes
1answer
92 views
Captcha text morphing effect
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" ...
0
votes
1answer
70 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}]
...
2
votes
1answer
55 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. ...
1
vote
0answers
44 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 ...
9
votes
2answers
193 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:
...
0
votes
1answer
43 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 ...
9
votes
3answers
862 views
Detecting the outer edge
I am trying to extract the outer edge of the attached image. Could you please advice me how to do it?
6
votes
1answer
62 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.
...
8
votes
2answers
419 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 ...
3
votes
2answers
94 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.
...
22
votes
3answers
978 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 ...
3
votes
2answers
74 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 ...
5
votes
4answers
471 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 ...
0
votes
0answers
31 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, ...
3
votes
0answers
59 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*)
...
0
votes
0answers
32 views
2
votes
1answer
95 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!
5
votes
1answer
80 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 ...
2
votes
2answers
127 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:
...
0
votes
1answer
95 views
map cellular automaton to planar surface
Im exploring possibility to apply a CA to a portion of a region in an image.
Think that I can process an image to identify a region, as an example, a green area.
I would like to confine that area, ...
13
votes
3answers
299 views
Deleting noisy data from a plot (manually) and export the best remaining data
I have the following temperature time-series. As you can see it contains very very noisy points in some periods (Fig.A). I tried to approach the best data(the black one in the center) based on the ...
3
votes
0answers
87 views
Image Processing: Detecting certain edge features over varying contrasts
Images and description-
• The images are obtained from the frames of a video (>1000 images)
• As shown, there are contrast variations between the images
• The bubble shifts horizontally ...
1
vote
2answers
73 views
Labeling detected objects in image with number of overexposed pixels
I have the following image:
In here I want do detect all objects and label them according to their number of overexposed pixels.
Here is my code:
...
1
vote
2answers
75 views
Overplot overexposed pixels on image
I have an image and want to mark each pixel which has a brightness of 1 with yellow color.
The image is (png, 8bit):
My code ...
11
votes
1answer
812 views
How to make a spiroglyphic?
Some (older) members of this group might remember playing vinyl LP records. Recently, at the Abbey Road studio there was a spiroglyphics coloring book for sale. It looks like a nice programming ...
1
vote
1answer
36 views
Set out of the disk region to white?
The image is generated by the code below:
img = ExampleData[{"TestImage", "House"}];
ImageTransformation[img, If[Norm[# - 0.5] < 0.5, #, {-0.1, -0.1}] &]
...
4
votes
0answers
73 views
How to TextRecognize a screenshot of code?
Are there any specific tricks or options to help TextRecognize work on a screenshot of an InputCell or code in general? For example, here's a screenshot that mixed ...
13
votes
2answers
252 views
Detect black & white circles (frog oocytes) in image
I've been trying to count how many cells are in this dish. But I haven't found a successful way because of the presence of withe and black sides in every one.
I have tried using ...
3
votes
1answer
104 views
Using ImageTransformation to implement relativistic aberration effect
****The desired effect should be images that look like something out of Star Wars like when you are boosting to high speeds in the Millennium Falcon.****
This problem was tackled by Daniel Weiskopf ...
1
vote
1answer
90 views
Numeric data from a color map
Importing the following image (without a scale):
and knowing the extreme temperatures, is it possible to obtain the graduated scale?
Also, it would be interesting to get the temperatures of all the ...
