Questions tagged [image-processing]
Questions on the image processing capabilities implemented in Mathematica.
1,216 questions
20
votes
3answers
913 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
62 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 ...
0
votes
0answers
27 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
52 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
30 views
2
votes
1answer
81 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!
4
votes
1answer
74 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
117 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
77 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, ...
11
votes
3answers
245 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
66 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
70 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
69 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
643 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
35 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
58 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
243 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
86 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
87 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 ...
2
votes
1answer
61 views
Memory consumption problem when reading png images with Image`ImportExportDump`ImageReadPNG
For importing png images I use often:
image = First@Image`ImportExportDump`ImageReadPNG[fileName]
(see: ?*`*PNG*)
since this is faster than:
...
-1
votes
2answers
80 views
6
votes
2answers
203 views
Manual implementation of the Sharpen function
does anyone know how to "manually" implement the built-in Sharpen function?
I'll show you my problem below:
Say I have a certain dataset, for example the one generated below:
...
2
votes
1answer
51 views
'Weighted' distance transform
A distance transform (as done by DistanceTransform[]) on a scattering of background pixels effectively creates a landscape of basins with conical morphology, each one starting from the same depth (...
0
votes
0answers
46 views
Convolution of an Image with Gaussian sigma = 1
I'm new to image processing and I've been testing out different Gaussian blur filters.
Out of curiosity, I generated an object that is a 2D Gaussian with sigma = 1.
I convolved this object with a ...
12
votes
2answers
213 views
3D Thinning algorithm in Mathematica
as far as I understood Thinning[] only works on 2D images thus far. Is there a library/piece of code that performs 3D Thinning in Mathematica?
Max
edit: I want ...
3
votes
2answers
171 views
Using image data to create a 3D Histogram
I have a black and white .tiff file of a beam spot:
I am trying to characterize the source in a Monte Carlo program, to do this I want to convert the image into a 3D Histogram with controllable bin ...
6
votes
2answers
243 views
How to find the mark centroid
This is my target img:
I can binarize it and select the mark component:
bin = Opening[ColorNegate[Binarize[img, 0.8]], 4]
...
0
votes
0answers
42 views
Convert Chinese character into a list of lines
For a puzzle I want to list pairs of Chinese cities. Once a line is drawn between each pair of cities the resulting lines will spell out a phrase in Chinese which is the answer to the puzzle.
I've ...
1
vote
1answer
39 views
Plot number of overexposed pixels per column in grey scale image
I have a grey scale image (1600*480 pixels, 8 bit): https://i.imgur.com/BqgJRv7.png (update)
I want to determine the number of overexposed pixels in each column.
Then I want to plot the a combined ...
3
votes
1answer
76 views
How to control boundary markers for overlapping FEM meshes?
I am trying to create FE meshes from vector or bitmap images and have come across the following issue. This is best shown using the following simplified code.
...
4
votes
1answer
133 views
How to create meshes with multiple regions from 2D images?
I would like to import 2D images to Mathematica and to use them to create meshed regions which can then be used for FEM. I create the images in Adobe illustrator so can either import a vector based ...
11
votes
1answer
473 views
How can I extract data from a diagram?
Below you will see a diagram containing three curves.
How can I extract data points from the three colored curves? I need to use the original data.
5
votes
1answer
70 views
Import Integer images using Image`ImportExportDump`ImageReadTIFF
I can import 70000 x 2MB TIFF images (~140GB) using
Image`ImportExportDump`ImageReadTIFF
in about 3 minutes based on @Szabolcs solution to this question by @Kagaratsch which is fantastic.
...
1
vote
1answer
60 views
Confusion in the position of image coordinates
I am struggling to work out how image coordinates are calculated and how to be consistent when finding particular points in an image using these coordinates for further analysis. I don't think it is ...
9
votes
1answer
124 views
Wha't the meaning of NaN in the descriptor of ImageKeypoints
Bug introduced in 10.3 or earlier and persisting through 11.3
...
4
votes
0answers
84 views
How to combine multiple image processing steps into a GUI
I'm trying to combine several Manipulate objects into a single workflow, for semi-automating an image analysis. I have worked out how to do each individual part, ...
2
votes
0answers
36 views
issue with ImageEffect; EdgeStylization
I have a issue with ImageEffect/EdgeStylization. After importing a .jpg-file like
test = Import["C:\\........\\DSCN0018_v1.jpg"]
The result is:
Then I take a ...
4
votes
1answer
74 views
How to achieve faster performance on plotting complex valued functions
I'm very interested in visualizing complex valued functions $f:\mathbb{C} \rightarrow \mathbb{C}$. Especially interesting to me are Möbius transformations.
I found a nice way of visualizing these ...
5
votes
1answer
133 views
Isolate structures from image
I have a medical brain image from which I'm trying to isolate the brain (the gray pixels) from the rest (black and white parts).
I'm looking for some functions that are best suited for this.
Thanks
5
votes
1answer
146 views
How to perform noisy circle detection
I want to detect circles that are embedded in noise. For this I created a few circles with some defined signal-to-noise ratio:
...
6
votes
2answers
148 views
Interactive Labeling of Images
I have a list of pictures:
pictures = {im1,im2,im3,im4,im5,im6}
Where
im1:
im2:
im3:
im4:
im5:
im6:
I want to assign the pictures to labels (1,2,3,4,5 ...
3
votes
2answers
105 views
How to find the center of rows in a grayscale image of a data table
I have such images
I want to draw a red line in every line content like this:
If I accumulate the pixel value for every line, I can get the red curve line:
...
4
votes
2answers
79 views
Coloring a binary mask image
My answer to this question involved changing the white in a binary mask to a different color.
I came up with a few ways to do this:
...
10
votes
3answers
806 views
Coloring a map of India
Below is a map of India (img).
and I can visualize it in the following way:
...
10
votes
1answer
186 views
Converting Image to full-length lines
I want to write a program in Mathematica that takes an image and converts it into a drawing made completely of straight full-length lines.
The program should check all the lines of the image, then ...
3
votes
1answer
82 views
ImageMesh for continuous 3D images
I have a 3D image containing distance fields, and would like to produce a mesh region from a contour at a fixed level.
I found two options for this
ImageMesh[], ...
2
votes
0answers
42 views
Smoothing a image while retaining the edges
In my previous post here it is mentioned that using ImageResize before ImageGraphics will increase image quality of the final ...
8
votes
1answer
172 views
Removing Presenter From Slides
Often you can find slide presentation where the presenter is also shown on the same slide:
When no pdf slides are available, I sometimes take scree shots of the video. However, I would like to remove ...
12
votes
1answer
332 views
Converting image into graphics
I have a black-white image, but it is rather blurry so I was thinking of converting it into vector graphics so I could do some coloring. This is the image:
...
1
vote
1answer
49 views
Counting pixels in a binarized 3d image
I have a stack of DICOM images which have been used to create a 3D image. This image has been put through specific filters in order to isolate only the areas of interest and binarize the 3D image. I ...
