Questions on the image processing capabilities implemented in Mathematica.

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6
votes
2answers
556 views

Remove country flags that match a certain image pattern

I wanted to create the flag you create when you average over all the flags of the world, for this little post: medium ...
1
vote
0answers
69 views

Detecting and measuring an ellipse in a glaucoma photo? [duplicate]

I've tried the solutions given in How to find a circular object in the image glaucoma? to detect the ellipse, but the detection results are not quite what I wanted. In glaucoma we have a cup to disk ...
12
votes
2answers
1k views

Detecting an ellipse in a glaucoma photo

For glaucoma diagnosis it is common to determine a "cup to disk ratio" which compares the diameter of the optic disk (VDD) and optic cup (VCD). The optical disk is visible as a circular red feature ...
3
votes
2answers
59 views

Converting x,y pairs to an image: alternative to Histogram3D for sparse data?

I have a list of {x, y} integer pairs representing single events in pixel coordinates in the {x, y} plane, with occasional ...
4
votes
2answers
152 views

How to find analytical expresion for data from image

I need to find an analytical expression for the data collected from an image. I found a relevant topic on how to extract the data in here. But there are some differences in my question. I have this ...
0
votes
0answers
58 views

Creating rectangles from “ImageCorners” output

I want to create multiple rectangle areas from this image where the rectangle would be defined by the points on the edges of the outer most squares - dont mind the inner ones. In the end there ...
4
votes
1answer
144 views

Calculating consumed internet data from bitmap of chart

My internet connection has a speed drawn up by the y axes has a scale as KB per second. and the x axes is time elapsed. if the x axes be from 0 to 40 minutes how can I calculate total consumed ...
1
vote
2answers
66 views

Scan over array of images

I would like to take in an array of images as input, and then call the ColorSeparate function on each of them, and retrieve this as output. So far I have the following : ...
3
votes
1answer
68 views

How to determine the value of an angle starting from an image? [duplicate]

I have two lines drawn with Mathematica, how do I calculate the angle between these two lines to have the numeric value of that angle? Thank you
9
votes
1answer
238 views

How to patch fingerprint ridges

I get a fingerprint: But as you see,there are some place is discontinuous,such as: The question is how to patch the discontinuous line according its gradient?The only one thing that I can think ...
0
votes
0answers
21 views

How to get an image when having indices of pixels [duplicate]

I am doing a perspective projection of a list of voxel V={v1,v2,v3,...,vn} using the perspective projection matrix 3*4 to get the indices of each pixel pi=(xi,yi). pi=P*vi Once I get the indices, I ...
8
votes
1answer
230 views

Creating a colour variation effect of the Northern Lights

As is well known (see https://www.youtube.com/watch?v=fVsONlc3OUY ), the Northern Lights or Auroral displays appear as variations of several colours (generally pale green and pink). Is there a ...
1
vote
1answer
83 views

Rotating an image if the height is larger than width?

I would like to rotate an image if and only if, the aspect ratio of the image is > 1, else just print the original picture and afterwards use the data. My problem is that Mathematica writes ...
4
votes
2answers
151 views

Image transformation to break up connected components

I have a picture of a bunch of sphere, and I want to calculate the centroid of each sphere on the plane and generate the Voronoi diagram for it. But (1) In the picture the sphere are contacting each ...
20
votes
2answers
572 views

Convert binary voxel image to geometric region

I have a binary voxel image which described a contiguous region in space. Example: ...
4
votes
2answers
171 views

PixelValues along a straight Line [duplicate]

UPDATE to the question I have reformulated the question in order to make it distinct from the one suggested as a duplicate: "Line Intensity Profile From Image." The key difference is that I'm ...
2
votes
0answers
81 views

Tracking movement via ImageFeatureTracking doesn't work

I have a series of 37 b/w microscopy photos. The whole sample shifts slightly (by ~10 pixels) from photo to photo (systematic error). See an example photo here and download two photos pos4_0.dat and ...
3
votes
1answer
155 views

Circular crop: extract non rectangular parts of an image

I want to extract a part of an image. For example, let's start with something like the following image: I would like to apply some image processing to get this result: I have tried to ...
9
votes
4answers
197 views

How can I delineate the outline of a complex shape?

I have a picture of a lake as follows: And I want to delineate the outline of the lake. I binarized the picture and obtained img: ...
0
votes
0answers
38 views

Minimum bounding rectangle of point set of image data + relative position

I have an image and a subset of points for which I want to get the minimum bounding rectangle (MBR), along with its relative position in the source image (so I can edit it somehow then restitch it ...
0
votes
0answers
41 views
4
votes
1answer
96 views

How to use the ButterworthFilterModel to processing image

In the book of "Digital_Image_Processing_3rd" point out this: the 4.57a,4.57b,4.57c is like follow: So I do it according to the direction to: ...
9
votes
1answer
449 views

How to create a 3D model based on MRI cross-sections?

Recently, I stumbled upon the following surreal MRI-scan of broccoli: and ever since the moment that I saw this I've been wondering whether it is possible to recreate the broccoli based on ...
9
votes
3answers
193 views

How to convert the binarize-picture to a Region

The Region of Mathematica is nice,and is the new conception of version 10.0.I can convenient get ...
16
votes
2answers
978 views

How to automatically remove text from images?

I'd like to remove the text in the center of images automatically. To use Inpaint[], you need a mask, but I don't have one. So really the problem is: How to build ...
4
votes
1answer
69 views

Fill a Circle in an Image

Let's suppose I have something like this (the image resulting from this): ColorNegate[Rasterize[Graphics[Circle[{100, 100}, 50]]]] Now, what I want to do is fill ...
11
votes
1answer
242 views

Can I get the curvature at any point of a random curve?

Random curve like the above, for example. The data source is an image file. I don't have an expression. I want to start by curve fitting and then compute curvature. Is it possible?
13
votes
1answer
595 views

Can I OCR Mathematica code on an image?

There's no doubt that one should always post the Mathematica code text rather than its screenshot when asking questions in this site, but every time I saw someone posting a screenshot, I can't help ...
2
votes
1answer
190 views

Challenge: deblurring images [duplicate]

My friend came back from holidays, where he took lots of pictures. Unfortunately, the camera was set on manual focus and most pictures are blurry. It got me thinking that mathematica showed how to ...
2
votes
2answers
119 views

How to count the grid in the picture

I want to count how many grids in colunm and row,I know the answer is 38*11,But how can I use mma to count it?It confusion me ...
7
votes
1answer
145 views

Detect buildings in cadastral map as polygons

I have this topological cadastral map, and others: It can be imported into Mathematica using img = Import["http://i.stack.imgur.com/3udXJ.jpg"] I want to ...
4
votes
1answer
73 views

How to ImageIdentify multiple objects in a single image?

Suppose an image has multiple objects: ImageIdentify only finds the banana: ...
0
votes
1answer
87 views

Optimization of a voxel projection function

I implemented a function to check if a voxel (3D pixel) is well projected on the space of a image (black and white silhouette) through a perspective camera. The function does the work but It need more ...
7
votes
1answer
101 views

HighlightImage speed?

I am doing a study into image processing and motion detection. I am using various filters (ImageDifference, HighpassFilter, ...
21
votes
0answers
236 views

How to speed up PDF export in Mathematica 10

Based on this question: - Version 7 print environment - I set up two 10 page test documents in version 7.0.1 and version 10.1. The version 7 document exported to PDF in 4.18 seconds whereas the ...
6
votes
1answer
493 views

Angle between two areas of an image of a 2D FFT

I'm trying to obtain the angle between the red line and the area surrounded by the red circle, related to the middle of the image. Usually the area surrounded by the red circle is lighter than the ...
5
votes
1answer
105 views

Log transformation (in dimensions) of an image

Is there an easy way to do a log-transformation of an image? I'm not taking about the colours, but the geometry. The difficulty is to extrapolate pixels and round-offs. For example, an white image ...
4
votes
1answer
92 views

Rotate imported images which are inset into a Graphics container and then overlapped?

The methods given as answers to this question do not seem to work here. I suspect it is because of my use of Inset function. Consider two .png images hand1 and ...
9
votes
0answers
169 views

Image Processing: Car front detection

Background Image processing can be applied to car license plate detection problems see Wikipedia, segmenting numbers, belisarius's old answer. Also, on this site once can use some techniques ...
6
votes
1answer
126 views

Strategy to build efficiently an image using parts of many images

I have about 1000 images of 1000px $\times$ 1000px and a list which contains the coordinates of the pixels to select, for each of the 1000 images. Each pixel is used once, so the final image is a full ...
7
votes
2answers
291 views

How can this resampling code be made faster?

Suppose I have a matrix: sbt = RandomInteger[{0, 2^16 - 1}, {5202, 3465}]; It represents an image and I would like to do "pixel binning" on it, where I take ...
5
votes
1answer
213 views

Adjacency matrix from image file of plane map

I have image files (PNG format) of plane maps of regions delimited by black borders I would like Mathematica to compute the associated adjacency matrix for the contiguous regions in these maps. ...
1
vote
0answers
42 views

How to avoid “Quit[]” to execute notebook multiple times [duplicate]

I am using a program to binarize several images and then adding all the images together using "ImageAdd" to get one image. This image is required for further analysis of the images. The program ...
1
vote
1answer
78 views

Remove color artifacts in overlay of several Graphics objects?

I am trying to create an animation with a graphic of an arm that can bend at the elbow. For this purpose I created the following two images: hand1 and hand2. I load the images with ...
8
votes
1answer
80 views

ImageAdjust Documentation issues

A recent thread raised several concerns regarding the Documentation page for ImageAdjust. The first issue is related to the first statement under the ...
2
votes
0answers
69 views

Detecting discontinuities in derivatives in images

Considering an grey-scale image as a function $z=f(x,y)$. (Specifically, I'm interested in $f=h*h*...*h$, where $h$ is the indicator function of a regular hexagon.) I am interested in finding places ...
14
votes
2answers
620 views

How to detect loops in a vector field?

Given a vector field and I'd like to detect if there are streamlines in closed patterns. For example, if the input is a vector field like this: ...
7
votes
3answers
344 views

Coloured image transformation in pointillism

I would like to transform an image (a photo for example) into a set of single colour circles with fixed but adjustable diameter (bigger than the pixel size), into a kind of pointillism. The number of ...
6
votes
3answers
140 views

Which values did ImageAdjust choose?

I have a picture obtained from a camera in an experiment. It's a .dat file, contains only numbers. I can re-create the image by importing it as data and using the ...
3
votes
3answers
156 views

Coloring image components according to their area

I have a rasterized image img that is created by this code: ...