Questions on the image processing capabilities implemented in Mathematica.

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5
votes
2answers
149 views

Identifying and removing features from scanned handwriten text

Please, can I have some ideas and help on how to identify and remove features like this one or this one from scanned handwritten text like this: These features are not connected to other text ...
25
votes
3answers
3k views
+50

How can Mathematica be used to create images like these?

Here are two examples of artistic image interpolation using just black lines: TRIANGULATION: ANGULAR CELEBRITIES DRAWN WITH A PEN Interpolation for Triangulation-represented Digital Image The ...
0
votes
0answers
29 views

How to Extract Continuous .png Graph by Constant Piecewise Velocity? [on hold]

Time-Potential Data where the where the absolute values of axis do not matter but the points have possibly an equidistant piecewise velocity when comparing to the thread because regular jumps in the ...
17
votes
3answers
2k views

How can I efficiently “remap” an image?

Many image processing libraries like OpenCV, Intel Performance Primitives or Octave have a useful function called "remap", that takes an image, an array with X coordinates and an array with Y ...
3
votes
1answer
98 views

Background removal of gradient background

I am trying to calculate the sum of intensities present in my agarose gel: I want to compare the intensity of the total white band on the top with that of the one on the bottom. The idea is to ...
49
votes
3answers
2k views

Composition à la Mondrian

I would like to paint something like this or,even better, like this I have tried ...
1
vote
0answers
46 views

Magnify Part of a 3D Graphic [duplicate]

I have a 3D Graphic built, and I want to magnify part of it. I would prefer a circle or ring-shape that can be placed anywhere in front of a 3D graphic that would magnify it. Ultimately, I want to ...
0
votes
0answers
834 views

Metric Parameters such as Pratt Figure of Merit (Pratt-FOM) for Edge Detection [closed]

I have developed a new algorithm in Mathematica v9.0 for the Edge Detection and want to compare it with the existing Roberts, Sobel, Prewitt etc, operators in the presence of Noise. I have evaluated ...
2
votes
2answers
122 views

Multiple object detection and tracking in images

The code below: reads in a number of png images, where the background is dark and objects of interest (here 3) are bright dots determines in each image the coordinates and other information ...
44
votes
5answers
6k views

How can I extract data points from a black and white image?

Consider the following graph (source): Is there any way to extract the data points from this image in a semi-automatic way? I have seen, and tried the methods suggested in this question, but they ...
4
votes
1answer
195 views

Mathematica's morphological thinning algorithm

Could anyone cite some papers that describe Mathematica's morphological thinning algorithm?
3
votes
1answer
149 views

Delete all mostly white images in a folder

I need to delete images that are all or mostly white, here's a sample of them: Here is my my code finds, my code is not very accurate nor efficient: ...
0
votes
0answers
49 views

How to enhance the radial edges of an image

I have an image as follows: I want to enhance (not binarize) only the radial edges passing through the center so that it should look like this EDIT: Following the suggestion of J. M. I applied ...
1
vote
0answers
70 views

Build basic Adobe Kuler-type construction: improving performance / speed

Adobe Kuler is a useful web tool to create colour palettes, but it is limited to 5 colours. I am trying to make a basic Kuler-type construction, but it is very slow, and crashes on my computer for > ...
1
vote
1answer
129 views

Image Filtering in the frequency domain

Here is a good starting to fiter image in the frequency domain lena = ColorSeparate[ImageResize[ExampleData[{"TestImage", "Lena"}],{121,121}]][[1]]; (Create a ...
1
vote
2answers
193 views

Analyze pixel color distribution by sampling image over a defined area size (or grid?)

I have an image of different colored particles (red, green, and yellow) that are all mixed up against a black background. I am interested in knowing what color each particle has for its neighbor (if ...
2
votes
0answers
47 views

Finding position of text returned with `TextRecognize`

I am trying to extract data from images (using some of the methods presented in [1524]), and would like to have a way to selectively cover/remove text from axes and legends. ...
15
votes
2answers
940 views

Can Mathematica recompose an image?

The OP in this post on superuser.com asks how to recompose an image; quoting: I have a set of images, which are parts of a bigger image. I would like the images to assembled as automated as ...
1
vote
1answer
88 views

Make a glyph using the BezierCurve function

There are a lot of applications that you make a glyph from a scanned image. Mathematica does have fine tools to interpolate curves like the BezierCurve[] function. ...
5
votes
1answer
95 views

How to return position of one image inside of another [duplicate]

With ImageAlign result is another image, that is composition of another two. But I'm looking for function that will find position, x-y coordinates of smaller image ...
1
vote
1answer
246 views

Histograms of gray scale images

I have a large set of subsequent 8bit gray scale png images (50 Hz). They show the noise of a CMOS camera, with the lens covered. A subset of 50 images is available here: https://goo.gl/Sa3P9P I ...
4
votes
1answer
535 views

Count flowers in an image [duplicate]

How to count all flower in this image by using Mathematica? It is possible to detect red objects and then remove background? I guess this blog may be useful. and this question, "Count Elements in ...
4
votes
0answers
46 views

Resolution of geographical image [closed]

There is a simple code to draw a polygon showing Georgia, but resolution is low: ...
1
vote
1answer
65 views

How to complete boundary in masked image?

I am trying to generate a mask of the elliptical boundaries in this object. Any ideas on how I could complete the edge of a partially filled elliptical object? Thus far, I've obtained a mask that is ...
1
vote
0answers
67 views

Image-Processing/IntensityCentroid [closed]

To get the center of mass of a grey scale picture I would like to use ComponentMeasurements with IntensityCentroid. However the ...
10
votes
2answers
415 views

How to measure the slit size from given image using mathematica?

I want to measure the size of the optical slit from the microscope image. Here is the image: The dimension of image data is $1300\times1030$ and the real pixel size is $6.7$ micron. But the ...
5
votes
2answers
475 views

Image Rotation, Line Symmetry

I'd like to import an image, superimpose it, reduce the opacity of the overlaid image, and then use a manipulate to rotate the top image to illustrate rotational symmetry. The image below is using ...
6
votes
1answer
116 views

Filters on image vs data

I was using GaussianFilter and realized that applying it to an array yields a different result from applying it to an image. For instance: ...
2
votes
3answers
465 views

Using 2D Fourier transform of an image to detect typical wavelengths

I am new to Mathematica, and I have read this post to understand how to perform Fourier transform on an image. My mission is to extract information on the typical distance between the black patches in ...
3
votes
1answer
71 views

Morphological extension of an image mask

The following image is a mask derived from an imaged feature which extends to the top of the frame, but due to some lighting effects the top portion doesn't come in. Bear in mind that this is one ...
0
votes
0answers
41 views

3D curvature from Segmented Image

i have a CT - scan which i have segmented and i can visualize different phases as voxels. I can also identify blobs and visualize them as well. Is there a automatic way that i can compute the ...
8
votes
3answers
382 views

Noise filtering in images with PCA

I have a stack of images (usually ca 100) of the same sample. The images have intrinsic variation of the sample, which is my signal, and a lot of statistical noise. I did a principal components ...
1
vote
0answers
33 views

Fast Creation of Label Matrix for Use With ComponentMeasurements?

I am taking a lot of measurements from regions of interest in microscopy images and am finding that generating binary masks to use with ComponentMeasurements is rather slow (at least it's slow the way ...
1
vote
1answer
127 views

Speed Up Sampling of Perimeter of Polygon

I have a polygon whose vertices (points) are defined by some image coordinates that I have manually selected. The polygon is used to create a mask for a region of interest in a microscopy image. ...
20
votes
1answer
265 views

Interstellar Image Effects

I'd like to know how to create this type of gravitational lensing effect in an image (here are some star fields from the hubble) "I wrote down the equations and I tested them in Mathematica by ...
21
votes
2answers
2k views

How to remap a fisheye image?

I want to flatten a series of fisheye images by remapping them to a rectinlinear projection. To achieve this, I need to be able to remap the pixels of the image using fisheye correction formulas for ...
2
votes
2answers
115 views

How to copy Coordinates of “Get Coordinates” in Figure?

I am trying to reproduce the answer here about Recovering data points from an image. I click the figure and press "Get Coordinates". I would like to copy the four coordinates by CTRL-C and then paste ...
15
votes
1answer
595 views

How to use 2D Fourier analysis to clean the noise in an image

I have some other method to do this.But I desire to know how to use Fourier analysis to realize it. I found a base post about Fourier-analysis to use in Image-Processing--Calculate the 2D Fourier ...
1
vote
1answer
65 views

Getting raw data using DcRaw

I'm using dcraw program to import raw image data to Mathematica. When I use Run["dcraw -4 -D -T "image.nef"] (which converts it to an unprocessed linear TIFF file) ...
10
votes
3answers
1k views

Make the moon's 3D gif

How do I make the following gif I tried: ...
9
votes
1answer
126 views

How can I use Mathematica to make a captcha image?

This was inspired by this post which is about the serious business of website deployment in the Wolfram Cloud, and interaction with Google's reCaptcha system. I started thinking of how to make those ...
3
votes
1answer
83 views

Problem with ComponentMeasurements and property “Centroid” [closed]

I am showing here three test images to investigate the output of ComponentMeasurements when using the property "Centroid". <...
18
votes
2answers
1k views

Scraping High-Res images from the MoMA and the Van Gogh Museum websites

Many art websites allow the user to zoom into an image to see it at high resolution by using image tiles. It is great on the website, but presents problems if one wishes to compile a complete high ...
4
votes
1answer
173 views

How to apply by-hand image selection to different images

Mathematica supports image selections by hand, by utilizing the selection tool. I used it to extract relevant data (hundreds of little squares). Now I have a second image of same size, where I want to ...
3
votes
1answer
141 views

How to guarantee the point's position is fixed in the Graphics and Image

SeedRandom[8] plot = ParametricPlot[ Evaluate@BezierFunction[temPoint = RandomReal[{-50, 50}, {5, 2}]][ t], {t, 0, 1}, AxesOrigin -> {0, 0}] We can ...
17
votes
4answers
1k views

How to fill in an irregular border of an image

I have the following code which draws a graphic, and colors the regions in it in different colors: ...
14
votes
2answers
274 views

Fitting Stradivari's scroll

How can I find the simplest curve that gives me a scroll like this? This is where I am at the moment and doing it by hand is becoming more and more cumbersome. First, take a drawing of the scroll ...
7
votes
2answers
453 views

Remove object from the image

How to remove spider from "spider web"? there is good example in documentation center but how to make black marker of spider?