Questions on the image processing capabilities implemented in Mathematica.

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2
votes
1answer
586 views

Rolling Ball Image Background Subtraction [closed]

I am currently doing particle detection on some images and I wanted to do an Image Background Subtraction similar to what is available on ImageJ so as to even out the background tone. ImageJ uses a ...
7
votes
2answers
216 views

Analysis of many similar x-ray Images

From a 3d x-ray scan, I have many similar slices to analyze. Is there a way to determine the position of the three rectangles and the inner circle?
4
votes
1answer
440 views

Circle detection using invariance kernels

I'm not sure, if this belongs more to the signal processing forum or if I can post it in here, but I want to solve it via mathematica and it's some kind of image-processing I guess. I have a noisy ...
4
votes
1answer
250 views

Sample code for generating mosaic images doesn't work

I'm reading the blog on mosaics by Theodore Gray. I tried the first example: ...
15
votes
2answers
630 views

Extracting angles from a simple picture

I'm not sure if this is even possible with Mathematica, but I want to extract the angles between all lines in this picture: It consists of $12$ lines, so I want a matrix with $144$ entries. I ...
10
votes
1answer
303 views

How to efficiently mask an image?

I want to extract/cut out a part of an image. Since my mask is not rectangular I want to set pixels that are not masked to zero (black). My current approach is something like this: ...
4
votes
2answers
332 views

Recognize simple shapes in an image and color them randomly?

I have an image of polygons built from a polar function (see below). I'd like to color each triangle or quadrilateral a random color. Firstly, I'm not sure how to separate the simple shapes. ...
5
votes
2answers
445 views

Labelling objects in a picture with numbers

I need help processing a biology bacteria picture. I just started learning Mathematica and I hope you guys can use a simple method to help me solve the problem, please do not use super complicated ...
2
votes
2answers
175 views

ImageDifference. Is there an ImageSame, or how would one do that?

Is there an inverse to ImageDifference? What in two images are the same?
10
votes
2answers
283 views

Extract table from image

I have the image of a matrix (download it to see it bigger): Is there a way to convert this into a Mathematica numerical matrix, using Mathematica?
2
votes
1answer
262 views

How to make a big image/dashboard containing various data-graph

I want to make and image/dashborad (to export to PDF) with many VERTICAL bullet graphs gauges. And I canĀ“t make it, in a automatic way. In general, the questions are: QUESTION 1: How to make a ...
0
votes
0answers
43 views

How to get shadow of a 3d object [duplicate]

Suppose that we have a box or a sphere or an other 3D object and a ponctual light source. How we can generate the cast shadow using mathematic? Is there any tools to render a shadow given the light ...
0
votes
1answer
164 views

PixelValue with pixel indices [duplicate]

How Can we use PixelValue with pixel indices?
9
votes
1answer
285 views

Fitting Vogel's formula for phyllotaxis to the image of a flower

After having read this question I was inspired to investigate how we could take an image of a plant displaying phyllotaxis and fit Vogel's model of phyllotaxis to the image. The theory is very simple. ...
0
votes
1answer
228 views

Image convolution, motion blur

I define my degradation function as $$H(x,y;a,b,t)=\frac{T}{z}\sin z~e^{-jz}$$ where $$z=\pi(ax+by)$$ So I write ...
12
votes
5answers
739 views

Measuring the percentage of a given color in an area?

Given this image I would like to measure how much (in percentage relative to the square area) of each black delimited square is filled with green: ...
0
votes
0answers
86 views

How to find near circular objects in an image [duplicate]

I have an image similar to the one shown below, and I need to find all the red circles and count them. How could I possibly extract them? I am trying to do this in Mathematica for now, but eventually ...
2
votes
1answer
228 views

What are the min and max arguments to EdgeDetect?

What are the min and max arguments to EdgeDetect, for all methods and specifically "Sobel"? How do I find the limits or ranges ...
9
votes
4answers
513 views

Measure the length and width of the image

I obtained the images from a Magneto Optic Kerr Effect system from which I have to do some calculations. I cannot calculate the desired information from the images. The details are as follows: From ...