Questions on the image processing capabilities implemented in Mathematica.

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11
votes
2answers
171 views

Trainable WEKA segmentation of images

Is there a Mathematica equivalent of Trainable WEKA Segmentation as implemented in Fiji, the image processing software? A Google search did not return any relevant links. I attach the original image ...
6
votes
1answer
84 views

Calculation of 2D FFT for an image

I am trying to obtain 2D FFT of an image. From the 2D FFT, I wish to calculate the amplitude of the FFT averaged over a circle vs the distance in pixels by varying the radius of the pixels which is ...
5
votes
4answers
666 views

Finding number of pixels with certain RGB color in an image

I have the following image: To determine the number of black pixels (nBlackPixels) I use: ...
0
votes
0answers
38 views

Crop specific range of pixels on both sides of an Image [closed]

How can I crop 182 pixels on both sides(left and right) of an Image? ...
2
votes
0answers
63 views

Identify and measure single bubble radius in series of images (TIFF)

I aim to make use of Mathematica's image processing capabilities to measure the radius of bubbles in consecutive images taken with a high-speed camera. After searching through this website I have ...
0
votes
0answers
12 views

Finding parameters of a gaussian mixture model that uses markov models [migrated]

I'm using this paper for reference http://www.cs.cornell.edu/~asaxena/learningdepth/saxena_ijcv07_learningdepth.pdf I could get all the features required but have trouble with the probabilistic model. ...
12
votes
2answers
723 views

How to fill the space outside of an image after rotating it

I want to rotate this image by -50 degrees, and then fill up the black space around the rotated image with a bluish color. I can't find any documentation/answers that suggest how to do it. (Sorry ...
10
votes
3answers
271 views

Best method to find variation in width along the image of a slit?

EDIT: Solutions by @Alexey Popkov and @Vitaliy Kaurov are very intuitive and both can be used to find a solution for the task. I have a slit of 15-18 microns by 1 mm projected with magnified 4X onto ...
0
votes
0answers
55 views

How to spend any image in “2D” or “3D” to an image mesh, ie as a wire frame in black and white?

How to spend any image in "2D" or "3D" to an image mesh, ie as a wire frame in black and white? For example some of these: edit :example output
5
votes
2answers
134 views

Speed up image coloring with ReplaceImageValue

I have about 200000 rgb-images of such format (2160*577 pixels): I want to colorize in each image some parts in white color: ...
0
votes
0answers
54 views

Separate two intersecting curves in an image

I want to recover the data from an image of a plot by finding the points on the plot and fit them to a known model. I implemented the code for the cases where there's a single curve on the image, but ...
2
votes
0answers
74 views

adaptive histogram equalization

There is an interesting algorithm called contrast enhanced adaptive histogram equalization that does histogram equalization on small segments of an image (and then pastes them back together). I know ...
3
votes
0answers
91 views

Detect touching particles in image

I have a picture of glas spheres. I want to calculate different properties of these spheres such as circularity, size and count them. I have managed to fill the white centers of the particles to ...
1
vote
0answers
35 views

Using an arbitrary area bounded by lines for PDEs?

I have a set of lines I pulled from an image that make a closed loop, pretend it's a unit square for reference. Is there a way to use such an arbitrary region for solving PDEs, and is there a way to ...
1
vote
0answers
68 views

Extract peaks from image

EDIT: I've managed to solve the problem by using "Get Coordinates" on a couple of points and then figuring out the affine mapping by using the values they're supposed to be at, and applying that ...
0
votes
1answer
102 views

What kind of algorithm can be used to map image coordinates to cylinder coordinates

I plan to flatten an images on curved surface(eg: jar or door knob) and I found a pretty good post which helps me a lot :)(link below). However, I still confuse on how to map image coordinate to ...
0
votes
0answers
48 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
441 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"] ...
1
vote
0answers
39 views

ImageData to Image to ImageData, in LABColor [closed]

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
181 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?
3
votes
1answer
110 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.
4
votes
0answers
110 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 ...
1
vote
0answers
98 views
1
vote
1answer
78 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
votes
1answer
161 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 ...
6
votes
1answer
105 views

Video stabilization: extracting the transformation rules used 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 ...
3
votes
2answers
43 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
2answers
324 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 ...
3
votes
0answers
97 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
1answer
78 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 ...
1
vote
0answers
73 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. ...
0
votes
0answers
33 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. ...
8
votes
1answer
122 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
36 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
53 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 ...
20
votes
1answer
287 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 ...
8
votes
4answers
134 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 ...
3
votes
1answer
113 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 ...
4
votes
3answers
180 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 ...
0
votes
2answers
64 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 ...
12
votes
3answers
252 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
128 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 ...
21
votes
1answer
281 views
4
votes
0answers
106 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
95 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 ...
2
votes
2answers
735 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 ...
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 ...
16
votes
1answer
287 views

Extracting road curves from an image

I have taken several gps readings while driving around town. ...
0
votes
1answer
89 views

MagiQuest Wand Identifier

My kids recently played MagiQuest, a game wherein people run around with "magic wands" that shoot out infrared light into sensors that activate different portions of the game. Each wand shoots out a ...
1
vote
0answers
94 views

Cell counting from an image file [closed]

I have a lot of cell culturing pictures. One of the example is as follows: Every black dot represents a cell, and I need to count only the cells on the image. I have a code to detect and count the ...