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Questions tagged [image-processing]

Questions on the image processing capabilities implemented in Mathematica.

3
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2answers
82 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. ...
20
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3answers
928 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 ...
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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
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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*) ...
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0answers
30 views

Real-Time Image Processing [duplicate]

There is a code from wolfram Documentation Center ...
2
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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
75 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
121 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
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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
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3answers
247 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
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0answers
69 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 ...
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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: ...
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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
647 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}] &] ...
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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
244 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
88 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: ...
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2answers
80 views
6
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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
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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] ...
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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
78 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. ...
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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 ...
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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
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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
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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
80 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
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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
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1answer
187 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
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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
333 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: ...