Tagged Questions

Questions on the image processing capabilities implemented in Mathematica.

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-1
votes
0answers
30 views

How to replace colours in an image from Wolfram Alpha [on hold]

I recently saw this post on the Wolfram Blog. I have tried doing the exact same thing on the blog but I'm not getting the same results. I'm getting this image: Instead of this: I'm also ...
3
votes
1answer
76 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 ...
-1
votes
0answers
52 views

Can I get features edge(face outline, mouth, nose, eyes, etc.) after clicking on edge points in an image? [on hold]

EdgeDetect always gives discontinuous feature edges. An algorithm that can get nice feature edges automatically is too complex. If I were to help by manually ...
5
votes
2answers
273 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 ...
12
votes
2answers
401 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 ...
1
vote
1answer
83 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 ...
4
votes
2answers
362 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 ...
1
vote
1answer
56 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 ...
2
votes
1answer
70 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 ...
0
votes
0answers
38 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: http://mathematica.stackexchange.com/a/39049/21482 The user Simon Woods suggested ...
3
votes
1answer
61 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 ...
0
votes
1answer
62 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? ...
0
votes
0answers
35 views

How to plot morphological stripe near the mouse-clicked position in an image? [duplicate]

I tried to use EdgeDetect and MorphologicalComponents to get the image edge elements. When I clicked on an image, I want the edge element nearby to be highlighted or plotted. Here is my code. Two ...
3
votes
1answer
54 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 ...
1
vote
1answer
66 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 ...
11
votes
4answers
189 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 ...
0
votes
0answers
60 views

stacking images

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 ...
2
votes
0answers
90 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 ...
5
votes
2answers
138 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 ...
5
votes
1answer
250 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.
0
votes
1answer
119 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 ...
3
votes
0answers
120 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. ...
2
votes
1answer
134 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 ...
0
votes
0answers
28 views

Can any function give a draggable closed curve on feature edge of an image like “EdgeDetect” found?

I've posted the question, but hardly describe it clearly, now let me show it this way: I don't know the algorithm for "EdgeDetect". Suppose the detected image edge consists of single line pixels at ...
4
votes
2answers
167 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 ...
8
votes
3answers
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 ...
1
vote
1answer
48 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 ...
14
votes
1answer
103 views

How can I restore the old `ImageCompose` behaviour?

Prior to version 10, if ImageCompose was used to overlay a partially transparent image region over a completely transparent image region, the result would keep the ...
1
vote
0answers
59 views

How to generate a 3D terrain from a terrain-map image? [closed]

I attempted to generate a 3D terrain from a terrain-map image with the following code. What I got was a NULL terrain. What is wrong with my code? ...
14
votes
1answer
702 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? ...
34
votes
3answers
1k views

Composition à la Mondrian

I would like to paint something like this or,even better, like this I have tried ...
1
vote
2answers
147 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 ...
6
votes
2answers
176 views

How to use Mathematica to turn a picture into low poly style?

I want to use Mathematica to turn a picture into low poly style. That is, to make the following conversion: Bill to Bill low poly(Using Image Triangulator App). I think the biggest difficulty is how ...
10
votes
1answer
209 views

How to do color-fill in Mathematica?

Color fill, the ability to apply a desired color to an enclosed area, is one of the basic functions provided by most graphic applications. Is there a similar ...
3
votes
1answer
95 views

How to track objects in video

I have a video that contains object moving in one direction, is it possible to track the objects and get information like object moving speed, object length and coordinates etc.? An example would be I ...
33
votes
5answers
4k views

How to ask Mathematica to imitate Andy Warhol's pop-art painting?

I tried to ask Mathematica to imitate Andy Warhol, let it convert a Marilyn Monroe's portrait looks like Warhol's world famous pop-art painting. However, the result shown below is far from ...
6
votes
2answers
435 views

How to make a cleaner copy out of a blurry text image before OCR?

A cleaner copy can be obtained from a blurry original by using the level adjustment in Photoshop before going for a better OCR. The picture below shows an example. ...
6
votes
1answer
75 views

Image compose coordinate problem

Am I missing something or this is a bug? Why I get different results by just adding a bracket? ...
2
votes
1answer
75 views

Image padding problem with transparent

I have an image that I'm trying to pad some transparent border. But I get error: "The specified padding value is not compatible with a 3-channel image." ...
2
votes
2answers
111 views

Compose one image over another

I'm a newbie in image processing using Mathematica. I'd like to compose an image $A$ over an image $B$ into an image C such that $\quad C[i,j] = B[i,j]$, if $A[i,j]$ is white $\quad C[i,j] = ...
4
votes
1answer
96 views

What should I do if the geographical map provided by Mathematica doesn't show some rivulets?

I have a list of geographical coordinates(maybe the coordinates are not that accurate, but the problem is not that vital): ...
10
votes
0answers
103 views

Segmentation of sunspots

I recently went for a walk with my camera and snapped a few pictures of the sun. The pictures didn't turn out too well, but this was to be expected without a telescope. I thought it might be a nice ...
8
votes
6answers
959 views

How to blend two photos in Mathematica?

The following two photographs forest and tiger were blended into one with screen blending mode in Photoshop. How to accomplish the same result in Mathematica? ...
8
votes
1answer
163 views

ImageTransformation: polar to cartesian

I am working on something that requires the polar transformation of some images. I implemented this transformation with ImageTransformation: ...
2
votes
3answers
154 views

Alternatives to Append/AppendTo for generating a list in an interactive DynamicModule?

I have a stack of timelapse microscopy images that I am trying to segment frame-by-frame using some of Mathematica's image processing functions. I have created a little interactive DynamicModule with ...
18
votes
2answers
368 views

Object separation from a 2.5D surface

I'm trying to identify the shape and the boundaries of objects. The data was generated with a laser scanner and represent the surface of an area in which many boulders lay on the ground and making up ...
2
votes
0answers
107 views

Power::infy: error using FindFit [closed]

I have a 2D data to fit (the Airy type pattern from diffraction of Gaussian beam on the circular aperture). Please see the attached picture. I was going to use a function like ...
5
votes
2answers
311 views

Is it possible to produce “tilt-shift” effect in Mathematica?

I attempted to produce a kind of miniature faking look from a street scene photo. I tried to shift the perspective lines close to parallel to each other to obtain such effect. However, the result ...
0
votes
1answer
71 views

Unusual Slow Down with LocatorPane/DynamicModule

I have coded up a little interactive DynamicModule to help me with image processing/segmentation of stacks of timelapse microscopy images. I am experiencing a crippling slow down in the ...
4
votes
1answer
108 views

How to translate and scale an image via ImageTransformation

Is there a way to translate and scale a 2D image simply by using ImageTransformation[] and TransformationFunction[]? I know how ...