# Tagged Questions

Questions on the image processing capabilities implemented in Mathematica.

153 views

### Character segmentation in poor quality grayscale

Given grayscale lines from a receipt like this: , in which parts of the letters sometimes appear almost as light as the background, my goal is to determine the $x$-positions of the centres of the ...
144 views

### Extract ROI from image by hand into Matrix Form

I have a 3D Image (each pixel contains information for various wavelengths). I draw the image for one wavelength by using ...
308 views

### Detect implicit grid in image with monospaced characters

I'm trying to detect the monospaced-grid in a possibly slightly deformed image of a receipt. Example input (full size here) My idea is to obtain the centroids or bounding boxes of all components ...
174 views

### Expecting an image or graphics instead of -Image-

Here's a snippet of my notebook. When run with the frontend, the code runs fine with no problem at all. However, when I save the notebook as .m file and run it using "Mathkernel -noprompt -script ...
1k views

### How to count and mark all counted objects in this image

I need some help on image processing in Mathematica (I have unsuccesfully tried with OpenCV). I have an image: and I need to count all objects in this image and mark them. The perfect result ...
577 views

### Calculate pixel intensity in two regions

I am just beginning to learn about image processing. I would like to know 1) How to show an original image with a visible mask of an arbitrary shape? 2) how to calculate the pixel intensities in the ...
291 views

### Obtain polygons describing all intersections of many polygons

I have 6894 polygons describing zones in a state plane (i.e., cartesian) coordinate system. Most are not very complex, and I believe none have holes. A random example is Polygon[{{351633., 564236.}...
83 views

### Import a web page with $\LaTeX$ code including images (png or other)

To be brief; I would like to import a web page, so I use Import["http://fabricebaudoin.wordpress.com/2012/10/25/lecture-32-the-malliavin-derivative/"]; which ...
71 views

### definitions and usages of options such as “Count” ,”Area”, “ConvexCount”, and “ConvexArea”

I would like to use ComponentMeasurements to do image analysis on porus materials. However definitions andusages of options such as “Count” ,”Area”, “ConvexCount”, and “ConvexArea” are not well ...
546 views

### Efficient way to compare animated images to tell if they are the same

I have a Student license for Mathematica, and felt like I wasn't making full use of the wonderful toolkit that it is; so I looked into things like its image processing capabilities. Now, I made and ...
138 views

### Ways to overcome failure of TextRecognize on relatively simple price tag?

I would like to perform OCR on this sample image. TextRecognize[Import["RedBox.jpg"], Language -> "German"] returns ...
359 views

### FindPeaks does not smooth noise on peak?

I have experimental data which is noisy. My objective is to find the peaks. Here is a short part of the data. ...
461 views

### Image processing: Line detection on paper images

So I have some Beta Radiographed papers and all of them have some vertical lines. What I am trying to do is write an automatic code which detects these vertical lines in almost all the images. The ...
203 views

### How to determine foci colocalization in a microscopy RGB image

I have a series of microscopy RGB images of the cell nucleus like this one The red and green dots are clusters of different proteins and I would like to determine when these dots colocalize. ...
360 views

### Why does this line increase the consumed memory?

Probably this is a simple question, however I really don't understand this behavior in Mathematica. It particularly leads to a memory leak in a huge program I have to do processing of 3D images. I ...
643 views

### Best fit equation from a scanned image

I am trying to extract a curve from a scanned graph and find a best fit equation. For example, starting from: How could one find an equation starting from the image file ?
158 views

### How to make distance transform invariant to scale?

I am trying to use a distance transform as a descriptor to encode silhouettes in order to do a shape recognition task. It is clear that distance transform distribution is invariant under rotation and ...
212 views

### How to intelligently use Binarize[] to find the surface concentration of an image?

A tiny bit of context: I'm using a TEM to take images of deposited metal on a surface. The images are in black and white. The deposited material forms little islands, and I want to use MM to figure ...
224 views

### Translate Image respect to its centroid

To apply DistanceTransform for shape recognition, I want to center all images in a fixed point {cx,cy}. I mean each image's centroid should be ...
529 views

### Get 2d corner coordinates / layout using edge detection

I'm new to Mathematica but I found an interesting usage of it: I'm programming a 2D game, with a top-view, where I'd like to have the edge coordinates of the walls. EdgeDetection delivers me quite a ...
235 views

### how to speedup subpixel registration

I have a bunch of small images that I need to register with larger images with sub-pixel resolution (ie. based on image interpolation ) This works.. seeking advice to improve performance. Create a ...
342 views

### BarcodeRecognize can read Chinese,but why BarcodeImage can't make Chinese characters to QR image?

For example: Import["http://www.image-share.com/upload/2735/230.jpg"] BarcodeRecognize@% can give a String "别看我，我会害羞..." but if I go on using ...
592 views

### Intersecting parabolas in an image

I have a friend who is a math teacher (like me) and while out cycling took this picture. The idea would be to create the equations of the quadratics that model the bridges and super-impose them on ...
202 views

### Mathematica 8 remove black background from image

How do I do that in Mathemtaica 8? I have found on this site many options like RemoveBackground[], but they don't work in Math.8. Are there any options? Here is ...
532 views

### Colorize Grayscale Image

I have a grayscale image that contains two objects. The grayscale pixel values can be divided into three intervals where two of them represent objects and the third represents the background. The ...
142 views

### Nothing happens when I click the mouse clicked on my graphics

I wrote codes to record list of coordinates when mouse clicked. It is expected that the coordinates should be plotted dynamically. But actually nothing happened. Can anybody help me to find the reason?...
187 views

### Image background subtraction using parallel computing

I am developing a program for pattern recognition. I want to use the parallel computing to get a real time application. I have two cameras where each one gives n frames/second. I need to process the ...
120 views

### Understanding the use of GradientOrientationFilter to achieve a “brushed” effect

I'm trying to recreate in Javascript a piece of code that appeared here on Mathematica, specifically in this answer. The user Simon Woods suggested an amazingly efficient way of drawing lines over ...
345 views

### Recognizing Matching Colors in a Game Grid from a Camera Image

I am relatively new to Mathematica, having taken my first serious dive into it this week. As a fun project to teach myself some of the basics, I've come up with a goal of optimally solving a game ...
236 views

### Why is my Fourier transformed matrix rotated?

After Fourier transforming and shifting the zero frequency of a matrix, my outcome is rotated by 45 degrees from what it should be. Can anybody spot why? ...
173 views

### How to create a 1D vector by selecting a straight line in a given angle of 2D array

Suppose I have an image created by the code provided below. I want to select a line (1D vector) $\left(y-y_{0}\right)=n\left(x-x_{0}\right)$ from the output image (2D matrix) by specifying $n$ and \$...
113 views

### Manipulate filters in arrayplot with graphical user interface

I have a set of images which need to be filtered by different filters. So I have made an interface in which the user can choose his or her filter. However I now want to manipulate the degree of the ...
526 views

### Segmentation of a microscopy image with uneven illumination

I am trying to do a little image segmentation on some cells taken from microscopy images that have uneven illumination. I am having trouble getting the background of the image cleaned up after ...
154 views

### stacking images [closed]

I would like to take a series of night sky photographic images taken sequentially and enhance dim stars in a single image. This is a standard function in astronomical image processing packages, but I ...
266 views

### Reading grave stone letters in an image

(Click on image to enlarge) (Click on image to enlarge) Is there an image processing technique that would aid in reading the letters and numbers on a grave headstone? Most stones are etched into ...
413 views

### Converting image data to array

I'd like to convert these images to a list or array in order to graph them. I know some rows are unreadable, but it doesn't really matter. So I tried using ...
390 views

### Areas of Voronoi cells from image file

I have an binary image with non-point objects. Does anyone have any suggestions how to determine area of each Voronoi cell in Voronoi diagram (goal is area distribution)? Thank you in advance.
319 views

### Order contour points in clockwise

I want to describe shape of an object using contour points descriptor. Given a silhouette (image black white of an object), I extrait the contour points using EdgeDetect[] fonction. After that, I need ...
568 views

### FindPeaks with noisy data

I am trying to understand the FindPeaks function in V10. I have two questions. Here is some measured data with noise. ...
303 views

### How to highlight image edge with spline/bezier when mouse moved over?

It is known that EdgeDetect can find image edges in an image. Suppose the image edges consists of sets of lines. Can the detected edge line near the mouse pointer be highlighted as spline/bezier when ...
308 views

### How to highlight the feature edge of an image with draggable select lasso?

As shown in the picture, i want to know if it is possible to: 1) recognize the feature edge like face,nose,eyes,mouse,etc. 2) highlight the feature edge with draggable select lasso, 3) return the ...
2k views

### How to generate a cartoon of a face

I want to use Mathematica to generate a cartoon of a face. For example, some thing like this: I think it can be done using Mathematica, but I really don't know how to do it. How can it be done, and ...
1k views

### Creating a foggy image

I want to create foggy images like this one (produced with Adobe Photoshop): Not at least familiar with Mathematica's Image processing capabilities, the only ...
82 views

### Bug in ClusteringComponents yielding different results on practically same input?

I am using the image below. I want to run a simple ClusteringComponents, using the KMeans method and ...
192 views

### How can I restore the old ImageCompose behaviour?

Update This issue caught me out again so I contacted support once more. They have confirmed that the development team considers the new behaviour to be correct and claim that "ImageCompose uses ...
741 views

### Is there a better way to “grow” black tulips?

I used the following clumsy way to obtain a bundle of black tulips. Is there a better way to do so? ...
2k views

### Composition à la Mondrian

I would like to paint something like this or,even better, like this I have tried ...
193 views

### Why ColorReplace does not follow the rules specified?

I tried to use ColorReplace to change the colors obtained from MorphologicalComponents. However some of the changes didn't ...