Questions tagged [image-processing]
Questions on the image processing capabilities implemented in Mathematica.
159
questions with no upvoted or accepted answers
30
votes
0answers
803 views
How to find a street pattern that fits a specific edge on a map
Cross post here
I have such funny pictures:
Very interesting,and you can get all of it by this code:
...
25
votes
0answers
1k views
Handwriting recognition with Mathematica
I am trying to teach Mathematica to read my handwriting. Since I don't want to ruin my reputation by showing my own handwriting, I am going to use a font called blackjack.
Lets say this is a ...
19
votes
0answers
625 views
How to ImageRestyle high-res images?
I’m running v12 now and ImageRestyle[] crashes for me on an image of size 1600 x 1200 pixels.
All the examples in the documentation use images around 500 x 500 or ...
15
votes
0answers
669 views
Find the Panda and the Cat - Dudolf puzzle
I recently find this puzzle where you have to find the panda from a group of snowmen. Having a horrible eyesight I have to take help of mathematica to find it.
I start with assumption that all ...
13
votes
0answers
498 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 ...
11
votes
0answers
325 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 ...
10
votes
0answers
212 views
How to segment rectangular photographs on a table?
Given an image of a table with photographs (take from any angle), I'm trying to extract the photographs and correctly align them into perfect rectangles. There are four steps to the algorithm:
Detect ...
9
votes
0answers
591 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 ...
8
votes
0answers
178 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
...
7
votes
0answers
123 views
How to pass in-memory images through ExternalEvaluate?
Version 11.2 has a new import/export format PythonExpression.
Unfortunately, it doesn't work out-of-the-box with images:
And using the ImageData directly is too slow:
Anyhow, I have some image ...
7
votes
0answers
385 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 ...)
...
7
votes
0answers
297 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.
Through ...
6
votes
0answers
488 views
How to recognize multiple objects in an image
I'm trying to do multi-object detection and recognition using Mathematica.
For example, in this image:
img = Import["https://i.stack.imgur.com/lbSwV.jpg"];
the ...
6
votes
0answers
293 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 ...
6
votes
0answers
2k 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 ...
5
votes
0answers
84 views
Recognising people from photos
I have a large number (probably 10000) of personal photos taken over the last few years, a good proportion of which contain family members.
I'd like to put together a photo book of one family member,...
5
votes
0answers
125 views
Hyperspectral files in the ENVI format?
Have any of you had the pleasure of reading geospatial / hyperspectral files in the ENVI format? Headers that describe the data here,
https://www.harrisgeospatial.com/docs/enviheaderfiles.html
which ...
5
votes
0answers
61 views
GaussianMatrix algorithm details
GaussianMatrix[] supports a Method -> "Bessel" option which the documentation describes (in the Details section) as:
With ...
5
votes
0answers
134 views
How to efficiently apply PCA followed by SVD to extract the components of PCA?
I am working on segmenting a textured image using Gabor Filters. This is based on this paper. There exist a Matlab implementation of this as well. Earlier I managed to do up to this. With the help of ...
5
votes
0answers
383 views
Detect and measure smooth peaks in a 2D image
I have multiple grayscale images where I want to identify elevations: I have to find the convex hull that encloses the base of each hill. An example image:
The images are already normalized, ...
5
votes
0answers
179 views
Finding transforming between regular and distorted grid
I'm trying to find the transformation function to go from the first image below to the second one. The manual suggest:
...
5
votes
0answers
79 views
How many clusters does DominantColors return?
Is there any documentation on how it automatically chooses the number of colors - does it use X-means or some other heuristic to determine the number of clusters it automatically returns?
5
votes
0answers
752 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 ...
4
votes
0answers
99 views
How to combine multiple image processing steps into a GUI
I'm trying to combine several Manipulate objects into a single workflow, for semi-automating an image analysis. I have worked out how to do each individual part, ...
4
votes
0answers
112 views
4
votes
0answers
150 views
How to identify shapes in an image
I have an image like that:
And I want to identify shapes in it:
I consider ComponentMeasurements and HighlightImage but I don't know how to achieve it.
4
votes
0answers
86 views
What is the meaning of ColorSpace -> Automatic?
The colour space of an image can be retrieved using Options[im] or ImageColorSpace[im]. A possible value is ...
4
votes
0answers
119 views
Which filter does InverseRadon use by default?
I am using the InverseRadon function. According to the documentation the function uses a Hann filter and no cutoff (...
4
votes
0answers
207 views
Image processing- Identify regions in a segmented image to measure the dye intensities
I have split my image into the 3 channels each representing a different dye. I have segmented each image and I now want to 1) Identify each of the segmented regions and 2) Detect the level of dye ...
4
votes
0answers
270 views
Fan beam tomographic projections in Mathematica
I am embarking on a little project to redo some of my old MATLAB image processing code in Mathematica.
I am particularly interested in tomography, and I know of the ...
4
votes
0answers
367 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 ...
4
votes
0answers
621 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 ...
4
votes
0answers
186 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 ...
4
votes
0answers
617 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 of ...
4
votes
0answers
334 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 ...
4
votes
0answers
779 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 ...
4
votes
0answers
1k 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 (ImageLines)...
3
votes
0answers
89 views
Roulette Ball Tracking with Mathematica
There is an image from roulette spin video, and I have a code to track the ball position on the image
(*Mask is a visible ball track on the rim*)
...
3
votes
0answers
107 views
Image Processing: Detecting certain edge features over varying contrasts
Images and description-
• The images are obtained from the frames of a video (>1000 images)
• As shown, there are contrast variations between the images
• The bubble shifts horizontally ...
3
votes
0answers
65 views
Always missing one component in Image Segmentation with SelectComponents-WatershedComponents-GradientFilter Method
I hope this is not a too specific issue and it is probably something very simple, but it is driving me insane.
I am trying some image processing on microscopy images to perform cell isolation as ...
3
votes
0answers
145 views
Image Segmentation: (Efficient Graph-Based)
This question is two-fold; First, it is about how to get the speed efficiency this algorithm should provide in Mathematica. In addition, it has a small question about the algorithm (Efficient Graph-...
3
votes
0answers
254 views
Image Generator with a Neural Network (CIFAR-10)
As some of you may know, CIFAR-10 is a data base which has 60,000 images (which are 32x32 in size) of 10 different categories (airplane, dog, cat, frog, deer, bird, horse, ship, automobile and truck). ...
3
votes
0answers
95 views
How to perform unsupervised texture classification?
Consider a texture mixture (img) from Brodatz.
I want to classify the five different texture patterns and segment the corresponding regions.
Following this,
I ...
3
votes
0answers
106 views
Highlighting an image with texture segmentation
I'm trying to take an image of a pencil sketch (http://www.vangoghgallery.com/catalog/image/1442/Sower-with-Setting-Sun.jpg) and colorize the different segments based on the texture. So in this image, ...
3
votes
0answers
319 views
Accessing advanced ZXing settings for BarcodeRecognize
Usual algorithms for detecting the presence of a QR-code in an image seem to have trouble detecting a code when it is tilted (especially at 45°). This is dependent on the resolution as well. The ...
3
votes
0answers
95 views
Finding position of objects of different shape
I have the following image taken with a CMOS camera (exposure time 0.012 sec, pixel size 23.5 micrometers):
It shows illuminated particles as bright spots. There ...
3
votes
0answers
63 views
What image adjustments are made when importing raw camera data?
I am trying to use Mathematica to import and process raw camera data in the Canon CR2 format. What I would like is data which has a linear relationship to exposure. I am thinking that the closest I ...
3
votes
0answers
106 views
Stereogram in Mathematica: inverse question
I've seen in this wonderful post that it's possible to create a stereogram in Mathematica.
But I didn't found anything regardless the inverse problem. Given a stereogram, is possible to retrieve the ...
3
votes
0answers
206 views
3
votes
0answers
272 views
How to set BitDepth and control dithering on exported GIF
Related: How to export a Graphics to PNG with BitDepth greater than 8?
I can't find a way to set the BitDepth of an exported GIF. It doesn't need to have great colour data, but I don't want to reduce ...
