Questions on the image processing capabilities implemented in Mathematica.

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0
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0answers
41 views

Pulling the boundaries from a Solidworks Profile in Mathematica

I'm currently trying to take a 2d profile generated in SolidWorks and use mathematica to analyze it. I need to pull lines that represent the boundaries of the shape from an image of the shape. . My ...
11
votes
2answers
393 views

How to speed up Colorize

I have a list of about 500 images similar to the following: A = Import["http://i.stack.imgur.com/1bV4O.png"] ...
7
votes
2answers
306 views

Using a given colour table with Image?

Context I would like to represent large images with a given colour table. Now, if I use Image ...
1
vote
0answers
30 views

ImageData to Image to ImageData, in LABColor [on hold]

Given an $m\times n$ image $G1$, I'm trying to: Extract the $mn$ pixels of $G1$ as an $n\times m$ matrix $M1$ of triples, where each triple represents the color in LAB space. Turn $M1$ into an ...
6
votes
1answer
147 views

Using ImageIdentify

How long does it take ImageIdentify to give an answer for one image? Also, I suppose using it requires an Internet connection with Wolfram servers. Is that correct?
52
votes
3answers
1k views

Reconstruct text pages cut by shredder

Q1: I have a page of a printed text file, but it was cut by a paper shredder (from top to bottom). You can download all the paper fragments here. Here are some of them. How can I reconstruct it? ...
3
votes
2answers
226 views

Binarizing a matrix

I have an image with a few bright pixels with the remaining ones very dark. The difference is in orders of magnitude. I want to binarize this matrix (corresponding to the image) making all values ...
-3
votes
0answers
39 views

Harris corner detection and plots [closed]

Could someone help me recreate these plots using Mathmatica. https://youtu.be/9-F5-gUIAWE?t=20m28s The are applying a hessian matrix to an image, and calculates the eigenvector.. And They then ...
3
votes
1answer
89 views

Compute a hessian matrix on a image?

Is it possible for Mathmatica to load a gray image and apply a hessian matrix on it?... It used image processing to find good features.
3
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0answers
90 views

Mapping Images in Parisian metro stations

One particular aspect of some Parisian metro stations is that stations' walls are curved, even in the sides where one would place advertising posters. Here is a picture of one such station: I was ...
6
votes
2answers
197 views

How to enhance a fuzzy image

First I am sorry if this question is duplicate. I am not familiar with image processing so I don't know how to search for answer. I have an images which were taken with good camera but the camera ...
1
vote
0answers
70 views
4
votes
1answer
148 views

Aligning transformed images to form a mosaic

I'm trying to align and stitch together these images to form a mosaic: It's a similar problem as this one: How to keep the non-overlapping parts when aligning images? However, (and I may not ...
1
vote
1answer
69 views

How to construct a kernel from a function?

I would like to convolve an image with a mathematical function. I understand that I need to have the mathematical function in a matrix form. How can I build it? Thanks
4
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0answers
69 views

How to extract the transformation rules used/identified by ImageAlign?

Imagine that I have a real life video, with all the artefacts coming from real life, and also from video compression, etc, and that I can edit this video, with filters and cropping, in such a way that ...
2
votes
3answers
255 views

Calculate pixel intensity in two regions

I am just beginning to learn about image processing. I would like to know 1) How to show an original image with a visible mask of an arbitrary shape? 2) how to calculate the pixel intensities in the ...
3
votes
2answers
42 views

Undesired resizing with ImageMultiply and Masking

I want to systematically measure image intensity around each of the points in this 256x256 image. i0: I already have centroid locating code to figure out the centers of each of these points. To ...
12
votes
3answers
246 views

Is there any faster implementation of DominantColors?

The function DominantColors is a simple function but runs incredibly slow when the number n of dominant colors to find is large - it is currently the biggest bottleneck in my code: ...
1
vote
1answer
59 views

Package for symbolic computation of christoffel symbols and parallel transports in Riemannian geometry, given the metric

I've no knowledge in mathematica (but I do in matlab), but I'd really appreciate if someone could mention what is/are the best and easy to learn mathematica package(s) for symbolic and numerical ...
12
votes
2answers
303 views

Analyze touching particles with holes in a microscopic image

I am looking for an easy method to count individual particles in a microscopic image. It is quite difficult for Mathematica to detect them, because they are touching each other. I am quite a beginner ...
2
votes
1answer
92 views

Efficient way to perform local Otsu thresholding on image

I have images of cell nuclei that have locally varying intensity distributions. Therefore, I need a robust local threshold algorithm. LocalAdaptiveBinarize works ...
3
votes
0answers
77 views

Help with Fourier analysis and filtering of an image

I am starting with the following image: For the curious, it is an STM scanned image of graphite. I am hoping to find some kind of periodic structure in the image related to the honeycomb structure ...
1
vote
0answers
45 views

Removing gutter shadows from scanned pages

I am new to image processing, and I was hoping someone might set me in the right direction. I am trying to create a simple toolkit for personal use for digitizing scanned book images into a database. ...
8
votes
1answer
116 views

Reconstruction of interrupted paths in images

I want to reconstruct paths in images and have already implemented a working method in Mathematica. On the left side you can see an image with interrupted paths and on the right side the reconstructed ...
0
votes
0answers
26 views

How can I find all stationary points? i.e Something like MinDetect but for saddle points (that applies to data arrays of arbitrary rank)

I would like to find all stationary points of a data set of arbitrary rank. MinDetect and MaxDetect are great for finding minima and maxima but I can't find a good way of finding the saddle points. ...
19
votes
1answer
268 views

Generating animations of clouds with Mathematica

I'd like to generate some visually-pleasing animations of clouds, fog or smoke with Mathematica. My idea of "visually-pleasing" is along the lines of one of the images on the Wikipedia article for ...
0
votes
0answers
35 views

Something like MinDetect but for saddle points [duplicate]

MinDetect will find all minima in an array of data of any rank. Is there something similar for finding all stationary points? i.e Given an array of data, find all minima, maxima, and saddle points of ...
1
vote
0answers
45 views

Raster image to a waveform, for audio adjustments, as image effects? [closed]

How can a normal (raster) image: Image["URL"] Be converted in the Wolfram Language to a waveform, for example in greyscale, being the sum of all the harmonics in ...
8
votes
4answers
129 views

ImageApply Performance Difference

How come the timing difference between these calls is so big? (0.2 and 39 seconds on my computer) ImageApply[q3, img] ImageApply[q3[#] &, img] Where ...
70
votes
8answers
13k views

How to make an inkblot?

How to effectively create a polygon that looks like a realistic inkblot? So far, I could come up with this (borrowing from Ed Pegg Jr.'s Rorschach demonstration): ...
16
votes
1answer
595 views

How to identify chemical substance from tattoo?

A friend of mine made a tattoo on his chest of some chemical substance formula. He challenged us to identify which substance is that. I thought that perhaps a combination of: Mathematica image ...
38
votes
7answers
2k views

Character edge finding

The following line of code finds the edge of a character: ...
42
votes
5answers
7k views

How to ask Mathematica to imitate Andy Warhol's pop-art painting?

I tried to ask Mathematica to imitate Andy Warhol, let it convert a Marilyn Monroe's portrait so that it looks like Warhol's world famous pop-art painting. However, the result shown below is far from ...
3
votes
1answer
243 views

How can I create a colour image using raw black and white data? (FITS data cube)

I have a data cube containing pictures of a galaxy across a thousand wavelengths. I want to take the data for the image slides in the red and blue parts of the spectrum, and have them represented in ...
4
votes
1answer
78 views

Trace one point's coordinate values in sequentially images

I am a research student in a university. I think I need some help. I used a video camera to monitor the vibration of a plank. Then I should calculate the amplitude and frequency of the vibration ...
0
votes
2answers
53 views

Help in evidencing a region (circular) of a .tiff image and cropping all the rest of the image

I'm asking for the community help since I have problems in cropping an image. I'm having LEED images which are 576*720p, which are made by a big black region at which middle I have the image I'm ...
3
votes
2answers
219 views

How to remove border points from InputForm?

I have this code, and it generates the below ListStreamPlot. The second graph is the ListStreamPlot overlaid with the points ...
4
votes
3answers
154 views

How do I plot a filled cylinder in 3D?

All, I'm trying to plot a filled cylinder in 3D using Graphics3D and then take 2D slices of said cylinder. I know that Cylinder is officially 'filled', but the 2D ...
1
vote
0answers
169 views

What is the Missing code in this Wolfram Blog article? [closed]

Here's a very cool Wolfram Blog Article with incomplete code, that can apply the Droste Effect to an image is various interesting ways. Copying this code, in the journal doesn't provide a working ...
1
vote
1answer
119 views

How to make a smooth electronic signature?

I have scanned a signature and that looks like this I want to smooth it. I saw this post where they do this using Photoshop or GIMP. I tried to replicate that in Mathematica so I can automatize ...
4
votes
0answers
91 views

What is the exhaustive list of categories and properties that ImageIdentify can output?

I'm looking for a complete list of ImageIdentify's outputs. I'm seeing entities like the one below, so I'm wondering what all possible classes are if they have ...
1
vote
1answer
87 views

interactively replace pixel value

I am trying to develop an "Eraser" tool for imagery as is available in other image editing programs so I can interactively clean up minor defects in imagery by simply mousing over them to set them to ...
13
votes
1answer
216 views

Segmentation of sunspots

I recently went for a walk with my camera and snapped a few pictures of the sun. The pictures didn't turn out too well, but this was to be expected without a telescope. I thought it might be a nice ...
2
votes
2answers
706 views

How do I find the average color of an image?

It sounds so simple to do, but the best solution I've found so far is by using the MeanFilter function, which isn't really feasible on large images. Can anyone help ...
8
votes
0answers
104 views

Efficient image stacking

I have a list of lists of images that I would like to stack and create mean images for each list of images. Images are .jpg files 2592x1944 pixels large. Each list ...
12
votes
1answer
153 views

Why does cropping an image improve TextRecognize so much?

I am trying to use the TextRecognize function to extract data from certain screenshots. This is already a cropped version. Using TextRecognize on this yields ...
64
votes
3answers
6k views

Recovering data points from an image

Unfortunately, some data can only be obtained in picture form (Japanese publications anyone?). Since this cannot be worked with, it has to be converted to a dataset that can; I was wondering whether ...
16
votes
1answer
255 views

Extracting road curves from an image

I have taken several gps readings while driving around town. ...
0
votes
0answers
78 views

How could I add the WorldMap skin to this parametricPlot3d?

How could I stamp the worldmap inthis sphere of variable radius? I´m interested in the meridian of greenwich (longitude=length=0 Degree) is in the position of the longitude=length=0ºDegree of the ...