# Tagged Questions

Questions on the image processing capabilities implemented in Mathematica.

1answer
140 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 ...
1answer
107 views

### Histograms of gray scale images

I have a large set of subsequent 8bit gray scale png images (50 Hz). They show the noise of a CMOS camera, with the lens covered. A subset of 50 images is available here: https://goo.gl/Sa3P9P I ...
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236 views

### How to speed up PDF export in Mathematica 10

Based on this question: - Version 7 print environment - I set up two 10 page test documents in version 7.0.1 and version 10.1. The version 7 document exported to PDF in 4.18 seconds whereas the ...
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400 views

### Proving (self) similarity with Mathematica - Reccurrence Plots, Similarity Plots etc

I posted this question in math.se but given the sheer tumultuous number of questions that keep appearing on math.se and also given that I am trying to accomplish this in Mathematica, I thought I'd ...
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168 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 ...
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169 views

### Image Processing: Car front detection

Background Image processing can be applied to car license plate detection problems see Wikipedia, segmenting numbers, belisarius's old answer. Also, on this site once can use some techniques ...
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278 views

### Visualization of traces of moving objects

An example movie which is made with the listed mathematica code below shows traces of moving objects: https://youtu.be/8jN2uuSHCEg (Melting ...) http://youtu.be/5ET62846C-I (Crystallisation ...) ...
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123 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 ...
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172 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. ...
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46 views

### How to count proportion of two phase in a electron microscope picture

I have a picture: The sunk area is a phase,and the bulged area in another phase.I want count the proportion of this two area.this is my method.First I get the ...
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186 views

### Challenge: Speeding up MaxDetect for application in 3D blob detection

In image segmentation it is a common problem that objects appear clustered and are therefore undistinguishable from each other when using simple algorithms. Based on this post I obtained efficient ...
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1k views

### computation of gradient vector field in 3D using GradientOrientationFilter

I want to compute a 3D gradient vector field of an Image3D object using the built-in GradientOrientationFilter function in Mathematica. From the documentation I ...
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88 views

### Tracking features where ImageFeatureTrack finds none?

How is it possible to track common features in the following sequence of images (e.g. holes or corner points along the top margin), ? I have had no luck with ...
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135 views

### Mapping Images in Parisian metro stations

One particular aspect of some Parisian metro stations is that stations' walls are curved, even in the sides where one would place advertising posters. Here is a picture of one such station: I was ...
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218 views

### Help with Fourier analysis and filtering of an image

I am starting with the following image: For the curious, it is an STM scanned image of graphite. I am hoping to find some kind of periodic structure in the image related to the honeycomb structure ...
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136 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 ...
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160 views

I am attempting to capture dynamic streams from multiple usb webcams using only mathematica. Using ImageCapture["Device" -> ImagingDevices[[x]], I've tried to ... 0answers 475 views ### Masked Image Registration/Alignment/Correlation 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 ... 0answers 434 views ### How can I create jpeg images of a given file size? Cross-posted at Wolfram Community I would like to have a function makeJPG[megabytes_] that generates random jpg images of given file sizes with itf filesize (in megabytes) watermarked on the image ... 0answers 661 views ### looking for a generalised Hough Transform function or a least a function to locate circles I am looking for a generalised Hough Transform function or a least a function to locate circles (position of center and radius) in a image. There is the standard Hough line search function ... 0answers 50 views ### NelderMeadMinimize for 2D Gaussian fitting I would like to fit a large number (10^5-10^6) of small images to 2D gaussians by taking advantage of the NelderMeadMinimize package from Oleksandr: Shaving the last 50 ms off NMinimize. The ... 0answers 27 views ### ImageForwardTransformation produces strange artifacts I am trying to manipulate an image in equirectangular projection with ImageForwardTransformation. I want to change the projection's inclination to the ecliptic. For ... 0answers 45 views ### Can I extract or deduce the effective input form to duplicate the results from an interactive toolbar? The interactive toolbars that are available in 10.0+ are very nice for getting images to look the way I want; but the black box functionality is very un-Mathematica-like, and doesn't help me if I want ... 0answers 53 views ### Convert (rescale) 16 Bit png image I have a camera (12 Bit Sensor, 2048 * 2048 Pixels). The images can also be exported in 16 Bit png format. Here different settings can be used. One setting is somewhat strange. For this special case ... 0answers 125 views ### Pattern recognition I am trying to have Mathematica come up with a simplified version of a real pattern. For the moment I'm trying with handwritten digits, but eventually I want to apply it to more complex photographs. ... 0answers 78 views ### Tracking movement via ImageFeatureTracking doesn't work I have a series of 37 b/w microscopy photos. The whole sample shifts slightly (by ~10 pixels) from photo to photo (systematic error). See an example photo here and download two photos pos4_0.dat and ... 0answers 95 views ### Identify and measure single bubble radius in series of images (TIFF) I aim to make use of Mathematica's image processing capabilities to measure the radius of bubbles in consecutive images taken with a high-speed camera. After searching through this website I have ... 0answers 173 views ### adaptive histogram equalization There is an interesting algorithm called contrast enhanced adaptive histogram equalization that does histogram equalization on small segments of an image (and then pastes them back together). I know ... 0answers 124 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? 0answers 306 views ### Understanding “IntensityData” coordinates Update - Playing around a bit, is it true that we need to process the list of "IntensityData" valuesr$as follows: r = Partition[r,k]; r = Transpose@r; And ... 0answers 72 views ### How to segment letters and text blobs? This new article from Google research describes how their Translate app preprocesses an image on a phone before applying convnets: It needs to weed out background objects like trees or cars, and ... 0answers 39 views ### Using an arbitrary area bounded by lines for PDEs? I have a set of lines I pulled from an image that make a closed loop, pretend it's a unit square for reference. Is there a way to use such an arbitrary region for solving PDEs, and is there a way to ... 0answers 106 views ### Extract peaks from image EDIT: I've managed to solve the problem by using "Get Coordinates" on a couple of points and then figuring out the affine mapping by using the values they're supposed to be at, and applying that ... 0answers 326 views ### Using 2D Fourier transform of an image to detect typical wavelengths I am new to Mathematica, and I have read this post to understand how to perform Fourier transform on an image. My mission is to extract information on the typical distance between the black patches in ... 0answers 147 views ### How can I detect certain letters by shape in an image? I have a website where people can post Flipbook animations, called Flipnotes. Unfortunately, most of the Popular flipnotes are in the following categories: MV (Music Video) AV (Audio Video) AMV ... 0answers 81 views ### Import a web page with$\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 ...
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105 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 ...
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135 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 ...
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260 views

### Speeding Up Image Processing Functions

I am working with stacks of 1024x1024 timelapse microscopy images that I am performing a series of image processing functions on to help segment each image. These functions include ...
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174 views

### How can I add drop shadows to the text of non-input/output cells?

Inspired by simon woods's wonderful shadow function, I want to add drop shadows to all the text of non-input/output cells in a notebook, something like this: By using simon woods's shadow function, ...
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57 views

### Creating rectangles from “ImageCorners” output

I want to create multiple rectangle areas from this image where the rectangle would be defined by the points on the edges of the outer most squares - dont mind the inner ones. In the end there ...
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37 views

### Minimum bounding rectangle of point set of image data + relative position

I have an image and a subset of points for which I want to get the minimum bounding rectangle (MBR), along with its relative position in the source image (so I can edit it somehow then restitch it ...
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72 views

### Separate two intersecting curves in an image

I want to recover the data from an image of a plot by finding the points on the plot and fit them to a known model. I implemented the code for the cases where there's a single curve on the image, but ...
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67 views

### Pulling the boundaries from a Solidworks Profile in Mathematica

I'm currently trying to take a 2d profile generated in SolidWorks and use mathematica to analyze it. I need to pull lines that represent the boundaries of the shape from an image of the shape. . My ...
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70 views

### How can I find all stationary points? i.e Something like MinDetect but for saddle points (that applies to data arrays of arbitrary rank)

I would like to find all stationary points of a data set of arbitrary rank. MinDetect and MaxDetect are great for finding minima and maxima but I can't find a good way of finding the saddle points. ...
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85 views

### How could I add the WorldMap skin to this parametricPlot3d?

How could I stamp the worldmap inthis sphere of variable radius? I´m interested in the meridian of greenwich (longitude=length=0 Degree) is in the position of the longitude=length=0ºDegree of the ...
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97 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 ...
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74 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 ...
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95 views

### GraphicsGrid command

When we merge some colorful plots to a single image, with the command GraphicsGrid, the quality of output image will be lost, slightly. That is, for instance all ...
0answers
688 views

### Metric Parameters such as Pratt Figure of Merit (Pratt-FOM) for Edge Detection

I have developed a new algorithm in Mathematica v9.0 for the Edge Detection and want to compare it with the existing Roberts, Sobel, Prewitt etc, operators in the presence of Noise. I have evaluated ...