Questions on the image processing capabilities implemented in Mathematica.

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1
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0answers
80 views

How can I detect certain letters by shape in an image?

I have a website where people can post Flipbook animations, called Flipnotes. Unfortunately, most of the Popular flipnotes are in the following categories: MV (Music Video) AV (Audio Video) AMV ...
3
votes
1answer
215 views

How can I train a binary classifier to find a logo?

So I'm trying to contruct a simple binary classifier. Problem: Classify an image as containing the apple logo, or not. I'd like it to be distortion, color, size and rotationally invariant. I'm sure ...
1
vote
1answer
80 views

Overlap an image in real time

I made a real-time face detector with Mathematica, and I want to put an image where it detects the face. Here is my code: ...
0
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0answers
52 views

When using Classify[] on images, is preprocessing necessary?

If the images in the training data set have different sizes and channels and color spaces, will this hinder the classifier? The examples in the documentation seem to suggest that normalization with ...
0
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0answers
51 views

Modulation voice

Good day I deal with an example where I want to modulate (skew) voice. After importing the voice, I did DFT, and then I want to shift the spectrum, but I do not know how to use it. Could anyone ...
4
votes
2answers
462 views

Image processing: Calculate the area of the region of interest

I am trying to compute the area of a particular region of interest from images which are obtained from an experiment. The original data looks like this: I have to calculate the area of the region ...
10
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1answer
218 views

How can I detect if an image is in or out of focus?

I need to filter out bad (blurry or ) images from a set, with some sort of blur detector.
1
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2answers
98 views

Extracting intensity from an image

Suppose I have an image sampleOriginal = Import["...mySample.png"] I then convert it to Grayscale colorspace ...
0
votes
1answer
109 views

Vectorize pixel SphericalPlot

I have a question about Mathematica images exporting. I have created 3d (SpericalPlot) with coloring function on it and then exported it to pdf. Is there any possibility to make more vector graphics ...
4
votes
1answer
115 views

Is there a way to characterize a winding object in an image?

I have this image, which I've already ran through a Gaussian image substraction, Binarize, Colornegate, and MorphologicalComponents: As you can see by the different colors, the colored parts are ...
4
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2answers
107 views

Apply ColorFunction to an Image

is there a faster way to change the colors of an image from grayscale to something like this: ...
4
votes
1answer
166 views

How can I integrate Open-CV with Mathematica?

I would like to run Open-CV functions from within Mathematica, can anyone figure out how to do this?
1
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0answers
60 views

How to get the SIFT features of an image?

According to the documentation, the function KeyPoints[] computes features only using SURF, but what about SIFT or FAST features?
0
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0answers
75 views

spherical histogram for 3D object

I want to develop a shperical histogram for 3D object. Given a 3D object, I put it in a cylinder where its axis pass through the centroid of the object. The cylinder is sampled into a number N of ...
3
votes
2answers
265 views

How can I make a blurred or gradient photo frame?

I would like to "frame" a photo with a rectangular blur or gradient. Here is an example from the web that was not made using Mathematica. (Of course, anything is possible; I suppose that this ...
0
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0answers
44 views

Removing Perspective Distortion [duplicate]

Below is my input: I would like to remove perspective distortion from the image. Expected output below:
4
votes
2answers
271 views

Speed up calculation

First of all thanks to: rm -rf, Mr.Wizard, Simon Woods, Pickett, Piotr Wendykier, Mac, Yves Klett, belisarius, halirutan, bill s, nikie, wxffles, ... Everybody of you helped me (a mathematica ...
3
votes
3answers
141 views

Colorize an image using two parameters

I have a matrix of data. I use Colorize[Image[Rescale[data]],ColorFunction->"Rainbow"] to create an image from the data where the value of each pixel is used ...
2
votes
1answer
55 views

RegionBinarize distance parameter has no effect

I'm trying to segment an object from background in noisy micro CT data. The original 3D volume data looks like this: ...
2
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0answers
93 views

How can I transfer colors from first image into second image? [duplicate]

How can I transfer colors from first image into second image, where every object from the first image should take the same object's color from first image. This images are only an example. this is ...
9
votes
3answers
820 views

Processing a circular rainbow in an image

I was flying cross country last week. We were at about 35000 feet with a complete cloud deck below us. I looked down and saw a complete circular rainbow above the clouds. It was in view about 10 ...
5
votes
3answers
327 views

Simple image processing very slow

I have compared the speed of some simple image processing routines between Mathematica an IDL. 1. Reading of a grey scale png image of (720,577) pixels: The image is: Mathematica: ...
3
votes
4answers
152 views

ReplaceImageValue and ReplacePixelValue extremely slow

I have a grey scale image: and I am doing the following: bin = Binarize[image, 0.18] ...
2
votes
2answers
238 views

Color Transfer from colored image into grayscale image

At first I did this where image is a grayscale image and example is a colored image ...
0
votes
0answers
55 views

Using OpenRead to read an element from a list saved in .mx format

I have a set of large arrays 1D (1-2 million entries) where each element corresponds to a pixel value from a picture. I would like to know how a pixel value changes from image to image (how the value ...
4
votes
2answers
150 views

Create an image showing max intensities in a set of images?

I would like to use a set of two images with the same color scheme (img1 and img2) to produce a new image (...
4
votes
1answer
175 views

Mask outliers in an image

I'm using Binarization/Morphological Operators to detect apples as objects, which has gotten me so far: I did get the mask using this code ...
1
vote
2answers
131 views

Colorizing thresholded images with different colors

I am switching from IDL (from exelis) to Mathematica and want to do the following: thersholding a image (all values above a certain threshold are set 1, the rest is 0 ) colorizing the thresholded ...
0
votes
1answer
88 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 ...
0
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1answer
79 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 ...
8
votes
1answer
229 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 ...
0
votes
0answers
74 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 ...
4
votes
2answers
300 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 ...
2
votes
2answers
169 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 ...
6
votes
1answer
172 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., ...
1
vote
0answers
68 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 ...
0
votes
1answer
39 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 ...
15
votes
2answers
377 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 ...
5
votes
0answers
94 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 ...
4
votes
2answers
165 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. ...
2
votes
1answer
276 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 ...
3
votes
0answers
82 views

How to determine foci colocalization in a microscopy RGB image

First of all thanks to everyone for the amazing amount of info and help provided here, I'm quite new to Mathematica so probably this is a very simple question but I'm not sure how to proceed. I have ...
15
votes
1answer
315 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 ...
3
votes
2answers
190 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 ?
2
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0answers
81 views

How to make Distance transform invariant to scale

I am using distance transform as a descriptor to encode silhouettes in order to do shape recognition task. It is clear that distribution of distance transform is invariant under rotation and ...
7
votes
1answer
118 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 ...
3
votes
1answer
164 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 ...
6
votes
1answer
239 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 ...
3
votes
1answer
121 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 ...
6
votes
2answers
306 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 ...