Questions on the image processing capabilities implemented in Mathematica.

learn more… | top users | synonyms (1)

7
votes
1answer
552 views

Anti-aliasing a fractal-like bitmap image

I have a .bmp image 9600x5400 that shows a lot of points at various intensities. There are no lines inside this picture - only a lot of points. I would like to apply anti-aliasing on the image to make ...
3
votes
2answers
479 views

Image processing: extracting ordered contour

Continuing the question How to extract the edge from a set of points and its answer by Simon Woods, I would like to ask if there is a way to extract the boundary of obtained as ...
7
votes
2answers
383 views

Reconstructing an image from overlapping patches

The Mathematica function ImagePartition can create overlapping sub-images with the pixel offset options {dw, dh}: ...
6
votes
1answer
423 views

Image fading from one corner to the other

I'm preparing a presentation where I want to place a background image on each slide (for aesthetics). These are extremely color filled images (like photos; lets use "ExampleData/lena.tif" as ...
5
votes
0answers
145 views

Challenge: Speeding up MaxDetect for application in 3D blob detection

In image segmentation it is a common problem that objects appear clustered and are therefore undistinguishable from each other when using simple algorithms. Based on this post I obtained efficient ...
7
votes
3answers
261 views

Morphological Components with periodic boundary conditions

I would like to find the connected(with periodic boundary conditions) components in a large binary matrix. What I've tried, and it does a fair job is: ...
2
votes
1answer
148 views

Importation multiple dcm images [duplicate]

I'm extremely new to Mathematica. I want to import 201 .dcm (DICOM) files into Mathematica 9. Is there a way to do this which doesn't require my doing it an image at a time? My ultimate need to is to ...
13
votes
1answer
643 views

Image Processing: Edge detection of the tumor on tomogram. Сalculation area of the tumor

The task is to identify the image region of the tumor. I try to use example from documentation centre: ...
19
votes
2answers
665 views

How to make a curve selectable from a scaned image and convert it to a list of coordinates

I have a scanned image (binary-ized): Is there any way to reduce one of these curved lines (full or dotted) to a series of its coordinates (e.g., sampling interval of 0.01 on x-axis)? I've read ...
2
votes
1answer
241 views

How to use the function ImageCorrelate? [closed]

I am a beginner in using Mathematica, know little about optics. However, I would like to know how to understand the function ImageCorrelate, since the ...
1
vote
0answers
145 views

How can I add drop shadows to the text of non-input/output cells?

Inspired by simon woods's wonderful shadow function, I want to add drop shadows to all the text of non-input/output cells in a notebook, something like this: By using simon woods's shadow function, ...
0
votes
2answers
175 views

Import a large no. of image from a folder together to Mathematica and assign a variable to each of the image [duplicate]

I am using Mathematica for the processing of images. For this I have to process a lot of images. Currently, I import one by one of the images to run the simulation. I want to import all the image ...
1
vote
2answers
207 views

Cropping a Plot without rasterization

Suppose that I make a plot of $x^2$ vs. $x$: myPlot = Plot[x^2, {x, -1, 1}, Frame -> True] If I click on the plot, I see the orange handles with which I can ...
0
votes
1answer
223 views

How to apply a conformal map to a jpg (or other image)

I would like to apply a conformal map to a jpg. For example, the map $z\mapsto z^2$ to this image: http://thumbs3.ebaystatic.com/d/l225/m/mGyeriV7l-YArkeBd9oMUng.jpg Any help on how to do this?
4
votes
0answers
338 views

Masked Image Registration/Alignment/Correlation

I'm trying to register (align) two circular grayscale images using a boolean mask to prevent them simply being aligned on the fixed circular border. There are also small fixed circular regions in the ...
37
votes
2answers
1k views

How can I add drop shadows and specular highlights to 2D graphics?

I thought I'd share some code in the form of a self-answered question, but other answers are of course welcome. Drop shadows are a familiar visual effect, giving the impression of a graphical element ...
2
votes
4answers
601 views

How to calculate the position of a figure in an image?

My question is about recognising soccer players in the pitch. Thanks to Bill S who wrote an excellent script to recognise parts of the players. I found this issue after testing his solution. I will ...
6
votes
2answers
304 views

Band Intensity Quantification

I would like to measure the density of my western blot band by measuring the area under the peak from this plot. More specifically, my image will have several lanes with a pattern of bands in each ...
0
votes
0answers
114 views

Correctly set up FindMinimum

I am trying to setup the following minimization to align two astronomical images. ...
1
vote
1answer
204 views

Image basics in mathematica

1) How the pixel values are defined in mathematica or how it is different from matlab? 2) I am wondering how image properties are different in mathematica, and how they are calculated? ...
6
votes
3answers
842 views

Understanding Bilinear ImageResize

In trying to understand basic image transformations, I have attempted to code my own image resize function that uses bilinear interpolation. I checked my work against Mma's ...
18
votes
1answer
387 views

Object differentiation in image

After purchasing a box of alphabet pasta for the kids, I wondered if there was way to extract the frequency of appearance of letters in the box by taken a sample and the analyzing the picture. ...
5
votes
2answers
315 views

How to make binary image from black holes on white background

How to convert black holes on white background, so that I can see a binary image of holes on white image or bright dots on black image. I can create a mask then also I am stuck with bright dot on ...
2
votes
4answers
277 views

Creating an image from data not in grayscale

I can Import data from excel and create a gray-scale image using Image[data, "Real"] But I want to change from grayscale and as an example use red as the color
8
votes
1answer
889 views

detecting the radius of an incomplete circle

I need your help to detect the radius of the blue circle in images like this: . Reading these questions: 1, 2, 3, I figured that this code taken from @halirutan answer to question n°3 could help: ...
1
vote
1answer
148 views

Image partition according to contours

I want to extract contours from following image or I am wondering how to partition following image: line image looks like: This question is linked: How to superimpose contour lines on ...
3
votes
2answers
278 views

How to superimpose contour lines on transformed image

My goal is to superimpose contours lines or contour plots on distance transformed image.
0
votes
1answer
306 views

Image processing, masking

My question is about finding a object in a specific part of a image. For example, I use this image: As you can see, you will se two persons walking on the field. I only want to find the second ...
2
votes
1answer
561 views

Importing a Canon Raw file (.CR2)

This is a very top level question with no code examples attached. I have an interest in using Mathematica to read raw files coming from a Canon camera, before they are converted into jpg's, where ...
2
votes
1answer
700 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
236 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
508 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
277 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
671 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 ...
11
votes
1answer
373 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
373 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
536 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
182 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
309 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
289 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 can´t make it, in a automatic way. In general, the questions are: QUESTION 1: How to make a ...
0
votes
1answer
175 views

PixelValue with pixel indices [duplicate]

How Can we use PixelValue with pixel indices?
9
votes
1answer
385 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
287 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
924 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
91 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
232 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
626 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 ...
4
votes
1answer
142 views

Exporting images in a Mathematica array to a PDF s.t. each image is precisely $n \times m$ millimeter in dimension [duplicate]

I have a number of images in a Mathematica array, and I'd like to export the images to a PDF s.t. each image is precisely scaled to be $n \times m$ millimeters in dimension. The idea is that printing ...
23
votes
4answers
3k views

How to create effect like Van Gogh's stroke brush?

I need to apply Van Gogh's stroke brush effect to a random image Take the following image as an example: Thank you so much if you could help!
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 ...