# Tagged Questions

Questions on the image processing capabilities implemented in Mathematica.

519 views

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 ...
69 views

### Dot shading a.k.a. Stippling effect [duplicate]

I am trying to convert grayscale images to black and white, where I hope to have certain artistic effect, called stippling: I have tried two methods; dithering (with ...
2k 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 ...
797 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 ...
456 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 ...
285 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? ...
1k 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 ...
498 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. ...
395 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 ...
568 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
1k 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: <...
182 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 ...
422 views

### How to superimpose contour lines on transformed image

My goal is to superimpose contours lines or contour plots on distance transformed image.
452 views

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 ...
799 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 ...
945 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 ...
294 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?
637 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 ...
313 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: ...
854 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 ...
692 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: ...
485 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. ...
735 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 ...
197 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?
458 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?
346 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 ...
211 views

### PixelValue with pixel indices [duplicate]

How Can we use PixelValue with pixel indices?
576 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. ...
406 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 ...
1k 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: ...
96 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 ...
239 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 ...
961 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 ...
175 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 ...
5k 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!
186 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 ...
1k views

### How to map an image to get an illusion of 3D

I would like to distort or map a given jpg so it looks 3D when viewed from certain angle, as in the following youtube video: http://www.youtube.com/watch?v=IfCCUd8mFtg. The most interesting part of ...
234 views

### Using high RasterSize or ImageResolution changes contour pattern

I found that the detailed contour pattern will be altered if we Rasterize the original graphics using high RasterSize or ...
273 views

### Slow image processing using ReplaceAll

Can anyone explain me, why this line of simple code is so slow? And can it be improved somehow? ...
327 views

### How can I create a colour image using raw black and white data? (FITS data cube)

I have a data cube containing pictures of a galaxy across a thousand wavelengths. I want to take the data for the image slides in the red and blue parts of the spectrum, and have them represented in ...
229 views

### How to ListPlot over an Imported Image

I would like to plot the gray scale (average of RGB) of an imported image, and combine the graph with the imported image. How can I do that in Mathematica? Say, the imported image is a 800x5-pixel ...
282 views

### Finding a Moore neighborhood connected path of bright pixels along the contour of a text character

I have a simple image, for example a blowup of a Times New Roman character like 'R' saved as a PNG. I then perform the following operations to extract a minimum representation of the contour lines ...
281 views

### Image analysis for extracting lines between cells

I have a 2D image as shown here and need to extract the spatial information about the curves in between each cell division. I have been able to analyze the image ...
191 views

### Export vector images

I am having difficulties exporting vector graphics. Using Kardashev3's code provided here: ...
936 views

### video image recognition [closed]

Has anybody experience with video and image recognition? I've made a video of two teams playing soccer. Now I would like to translate each soccer-player to a (x,y) coordinate and follow them during ...
86 views

### How to format the outputs of several properties of ComponentMeasurements?

I know someone may have asked similar questions but the solution doesn't work to me. My code is like this: ...
307 views

### measure minimum distance of dots from edge

I want to measure minimal distance of small dots from the edge of an image: Image of bright dots: Edge image ImageAdd looks like following:
656 views

### Selecting morphological components by clicking on them?

This is a bit of a follow-up to a previous question: How can I merge multiple sets of morphological components (perhaps selected using different metrics)? I've run into a few problems recently where ...