Questions on the image processing capabilities implemented in Mathematica.

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0answers
47 views

How to extract data points from an image of a log log plot? [duplicate]

I have a picture of a log-log plot, taken from a paper and I want to extract the data points so I will be able to plot them again along with results of my own solution. I would appreciate your help. ...
1
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1answer
43 views

Generate 2d image from image3d object

I have created a image3d from which I have rotated it to create a rotating view of the object. I want to be able to render each 'frame' to a 2d image so that I can export the frame sequence to create ...
0
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1answer
35 views

Correcting image distortion by warping a set of distorted points to a corresponding set of undistorted points

I was hoping someone might be able to help me undistort an image in Mathematica. The distortion doesn't follow any specific pattern, but there are several points on the distorted image that I am able ...
11
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3answers
884 views

Finding a function that fits the shape of an image

How can I find a function that fits the given shape of an image? Or instead extract a point set from the shape and then find an interpolating function fits the shape. An example image is attached.
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0answers
35 views

Automatic measurement of components in a picture

I have a tricky problem, with which I'm stuck just after a few steps. I have the following picture of a slice of the brain. I want to detect all the named structures and measure the area of those ...
4
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2answers
144 views

Calculating displacement for a circular disc

I have to calculate the difference in diameter of two concentric circles. The image is obtained from an experiment and the data looks like this. The length required is the value of l as marked in ...
1
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1answer
50 views

PNG image is exported smaller size than imported

I upload a PNG file and then split it into its red, green and blue components. I then save these components. The original image is 1440 x 764 pixels, 2.21MB. But the 3 saved files are each 360x198 ...
6
votes
1answer
110 views

Align stars in multiple images

I hope that you find this question interesting and that this will help others with similar problems as this configuration is not so particular. My problem I have multiple images of a particular ...
3
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0answers
55 views

Efficient image stacking

I have a list of lists of images that I would like to stack and create mean images for each list of images. Images are .jpg files 2592x1944 pixels large. Each list ...
0
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0answers
35 views

Using ImageCompose with Large Images

I am trying to use ImageCompose to overlay large images. The images are too large to manipulate in memory. I am familiar with ImageFileApply and ImageFileFilter to work with images on disk, but I do ...
-1
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0answers
43 views

What is the fastest way to implement sliding windows?

I need to make a laplacian pyramid and run my feature matcher over subwindows of my image at different scales for size invariance. So what is the fastest most efficient way to iterate my code over ...
0
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0answers
26 views

How to implement Raw libraries for importing and analysing raw images as .NEF? [duplicate]

It is the same question that I did in wolfram community. First, I tried import .nef images but math didnt recognize them, so I want to implement the library raw image following the instructions from: ...
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0answers
63 views

Using 2D Fourier transform of an image to detect typical wavelengths

I am new to Mathematica, and I have read this post to understand how to perform Fourier transform on an image. My mission is to extract information on the typical distance between the black patches in ...
1
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0answers
42 views

How can I union a set of images? [closed]

What is the best way to do image de-duplication in Mathematica. I've used a tool called Visipics in the past, which works well, but I need to do this in MMA. Basically the function I'm looking for, ...
6
votes
2answers
147 views

Efficient Lloyd Sampling of Images

I want to sample a grayscale image so that every voronoi cell contains approximately the same total intensity using lloyd sampling. My current code is kind of slow and I was hoping for some advice to ...
5
votes
4answers
687 views

Creating a realistic, photo-like 3D effect from an image or document

Suppose I have an image or a document, provided in a high-quality PDF file. You can open and view it in a PDF viewer, but then it has a kind of static look: it's not something tangible, it's just an ...
1
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0answers
63 views

Restoring an out of focus image

Folks, I am studying ways to deblurring an image: Sample: , an my goal is the money in that hand. Is possible improve the image, features, etc..? I tried all the de blurring methods: 1 - first I ...
1
vote
2answers
130 views

Inconsistent image sizing with Grid and Row?

Can anyone explain why Row and Grid don't size the image correctly and consistently to 300 ...
1
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0answers
55 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
189 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
73 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
39 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
49 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
352 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 ...
9
votes
1answer
193 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
84 views

Extracting intensity from an image

Suppose I have an image sampleOriginal = Import["...mySample.png"] I then convert it to Grayscale colorspace ...
0
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1answer
99 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
104 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
votes
2answers
97 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
142 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?
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0answers
51 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
68 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
192 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
43 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
248 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
129 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
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1answer
53 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
90 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
807 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
297 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
139 views

ReplaceImageValue and ReplacePixelValue extremely slow

I have a grey scale image: and I am doing the following: bin = Binarize[image, 0.18] ...
2
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2answers
168 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
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0answers
50 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
143 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
147 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
118 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
78 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
votes
1answer
72 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
212 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
64 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 ...