# Tagged Questions

Questions on the image processing capabilities implemented in Mathematica.

293 views

### Using ImageIdentify

How long does it take ImageIdentify to give an answer for one image? Also, I suppose using it requires an Internet connection with Wolfram servers. Is that correct?
352 views

### Compute a hessian matrix on a image?

Is it possible for Mathmatica to load a gray image and apply a hessian matrix on it?... It used image processing to find good features.
143 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 ...
125 views

### How to import all the images in a folder? [closed]

the source code is ...
136 views

### How to construct a kernel from a function?

I would like to convolve an image with a mathematical function. I understand that I need to have the mathematical function in a matrix form. How can I build it? Thanks
239 views

### Aligning transformed images to form a mosaic

I'm trying to align and stitch together these images to form a mosaic: It's a similar problem as this one: How to keep the non-overlapping parts when aligning images? However, (and I may not ...
194 views

### Video stabilization: extracting the transformation rules used by ImageAlign

Imagine that I have a real life video, with all the artefacts coming from real life, and also from video compression, etc, and that I can edit this video, with filters and cropping, in such a way that ...
58 views

### Undesired resizing with ImageMultiply and Masking

I want to systematically measure image intensity around each of the points in this 256x256 image. i0: I already have centroid locating code to figure out the centers of each of these points. To ...
425 views

### Analyze touching particles with holes in a microscopic image

I am looking for an easy method to count individual particles in a microscopic image. It is quite difficult for Mathematica to detect them, because they are touching each other. I am quite a beginner ...
299 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 ...
333 views

### Package for symbolic computation of christoffel symbols and parallel transports in Riemannian geometry, given the metric

I've no knowledge in mathematica (but I do in matlab), but I'd really appreciate if someone could mention what is/are the best and easy to learn mathematica package(s) for symbolic and numerical (both,...
554 views

### Removing gutter shadows from scanned pages

I am new to image processing, and I was hoping someone might set me in the right direction. I am trying to create a simple toolkit for personal use for digitizing scanned book images into a database. ...
375 views

### Reconstruction of interrupted paths in images

I want to reconstruct paths in images and have already implemented a working method in Mathematica. On the left side you can see an image with interrupted paths and on the right side the reconstructed ...
37 views

### Something like MinDetect but for saddle points [duplicate]

MinDetect will find all minima in an array of data of any rank. Is there something similar for finding all stationary points? i.e Given an array of data, find all minima, maxima, and saddle points of ...
95 views

### Raster image to a waveform, for audio adjustments, as image effects? [closed]

How can a normal (raster) image: Image["URL"] Be converted in the Wolfram Language to a waveform, for example in greyscale, being the sum of all the harmonics in ...
428 views

### Generating animations of clouds with Mathematica

I'd like to generate some visually-pleasing animations of clouds, fog or smoke with Mathematica. My idea of "visually-pleasing" is along the lines of one of the images on the Wikipedia article for ...
163 views

### ImageApply Performance Difference

How come the timing difference between these calls is so big? (0.2 and 39 seconds on my computer) ImageApply[q3, img] ImageApply[q3[#] &, img] Where ...
469 views

### Efficient way to perform local Otsu thresholding on image

I have images of cell nuclei that have locally varying intensity distributions. Therefore, I need a robust local threshold algorithm. LocalAdaptiveBinarize works ...
406 views

### How do I plot a filled cylinder in 3D?

All, I'm trying to plot a filled cylinder in 3D using Graphics3D and then take 2D slices of said cylinder. I know that Cylinder is officially 'filled', but the 2D ...
129 views

### Help in evidencing a region (circular) of a .tiff image and cropping all the rest of the image

I'm asking for the community help since I have problems in cropping an image. I'm having LEED images which are 576*720p, which are made by a big black region at which middle I have the image I'm ...
308 views

### Is there any faster implementation of DominantColors?

The function DominantColors is a simple function but runs incredibly slow when the number n of dominant colors to find is large - it is currently the biggest bottleneck in my code: ...
233 views

### How to make a smooth electronic signature?

I have scanned a signature and that looks like this I want to smooth it. I saw this post where they do this using Photoshop or GIMP. I tried to replicate that in Mathematica so I can automatize ...
415 views

### Mathematical morphology: removing text features from image, while keeping connectivity

I have this image of London's road networks. ...
123 views

### What is the exhaustive list of categories and properties that ImageIdentify can output? [closed]

I'm looking for a complete list of ImageIdentify's outputs. I'm seeing entities like the one below, so I'm wondering what all possible classes are if they have ...
167 views

### interactively replace pixel value

I am trying to develop an "Eraser" tool for imagery as is available in other image editing programs so I can interactively clean up minor defects in imagery by simply mousing over them to set them to ...
860 views

### How do I find the average color of an image?

It sounds so simple to do, but the best solution I've found so far is by using the MeanFilter function, which isn't really feasible on large images. Can anyone help ...
91 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 ...
490 views

### Extracting road curves from an image

I have taken several gps readings while driving around town. ...
277 views

### MagiQuest Wand Identifier

My kids recently played MagiQuest, a game wherein people run around with "magic wands" that shoot out infrared light into sensors that activate different portions of the game. Each wand shoots out a ...
227 views

### Cell counting from an image file [closed]

I have a lot of cell culturing pictures. One of the example is as follows: Every black dot represents a cell, and I need to count only the cells on the image. I have a code to detect and count the ...
803 views

### White balance correction with Mathematica

Does Mathematica include a function to correct the white balance of an image? ImageAdjust would seem to be the first go-to choice, but I haven't found a way to ...
50 views

### Constantly rotating 3d contour plot (ideally as a .gif) [duplicate]

I came across a neat image for a graph, and I wanted to reproduce this as a .gif using Mathematica (I have the 9th home edition)....
232 views

### Image processing for extracting regions of book pages that are covered by text

Is it possible to apply Mathematica's image processing capabilities for extracting regions of book pages that are covered by text, e.g. by a combination of blurring and binarizing, or better? Also the ...
463 views

### How to enhance a fuzzy image

First I am sorry if this question is duplicate. I am not familiar with image processing so I don't know how to search for answer. I have an images which were taken with good camera but the camera ...
278 views

### Why does cropping an image improve TextRecognize so much?

I am trying to use the TextRecognize function to extract data from certain screenshots. This is already a cropped version. Using TextRecognize on this yields <...
246 views

### How to keep the non-overlapping parts when aligning images?

I would like to stitch together a pair of images. For example: ...
300 views

### Coloring an image with two Color schemes based on a Range

I would like to color an image generated from some data, using two color schemes based on two ranges of the data. This is my attempt: ...
113 views

### How to save a bounding box on an image?

It's easy to save the coordinates of individual points, but for the life of me I can't seem to access the box's position and dimensions: {top, left, width, height}. How can I achieve this?
190 views

### Generating b/w bitmaps from a binary sequence

I would like to make a bitmap that visually represents a binary sequence, something like this: Where for example the 1's become a black pixel and the 0's a white one. I have never done something ...
80 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. ...
119 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 ...
194 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 ...
2k 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.
276 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 ...
105 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 ...
355 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 ...
191 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 ...
37 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: ...