Questions tagged [image]
Tag for questions about bitmapped graphics, particularly those using the Image function.
153
questions
36
votes
5answers
6k views
Efficiently generating n-D Gaussian random fields
I am interested in an efficient code to generate an $n$-D Gaussian random field (sometimes called processes in other fields of research), which has applications in cosmology.
Attempt
I wrote the ...
33
votes
3answers
3k views
How to place an image inside a notebook, with the minimum memory footprint?
When creating a notebook with images, like photos, the file tends to quickly get big, which makes it difficult to use the notebook format for training material containing a lot of images.
Are there ...
21
votes
2answers
4k views
Failure to export graphics by right-click when Notebook magnification is changed
Bug introduced in 9.0.1 or earlier and persisting through 11.0.1 or later
When I try to export graphics as PNG, JPG and other rasterized formats using the right-click and choosing ...
11
votes
2answers
601 views
Using a given colour table with Image?
Context
I would like to represent large images with a given colour table.
Now, if I use Image
...
13
votes
2answers
2k views
How do I display imported images at actual size?
I know that this is an extremely basic question, but I am having a lot of trouble finding the answer in the documentation.
When I import an image (for example, ...
15
votes
3answers
19k views
Calculate the 2D Fourier transform of an Image
I am new to Mathematica, and using version 8.0.
I would like to calculate the 2D Fourier Transform of an Image with Mathematica and plot the magnitude and phase ...
35
votes
7answers
9k views
Embed Code Into Image
I often export images(plots, matrix, arrays, etc..) from mathematica which I end up putting in word documents or uploading to the web. The problem is that I often lose the original code and I am left ...
15
votes
3answers
522 views
Deleting noisy data from a plot (manually) and export the best remaining data
I have the following temperature time-series. As you can see it contains very very noisy points in some periods (Fig.A). I tried to approach the best data(the black one in the center) based on the ...
15
votes
1answer
632 views
How to generate a Graph from a picture of a graph?
I have a picture like this
I can get this graph's vertexes
...
6
votes
1answer
284 views
Is it possible to render Graphics with more than “Byte” bitdepth?
I wonder is it possible to render Graphics in Mathematica with bitdepth higher than "Byte" which is the maximum bitdepth ...
9
votes
1answer
319 views
Transparent bitmaps or graphics in gui objects initially appear wrong
Bug introduced in V9.0 or earlier and persisting through V11.3
I have a problem with images with alpha channel which I want to use as labels on Button etc. Unless ...
20
votes
2answers
12k views
How can I detect a rectangular region of interest in a picture?
Here is a downsampled input image I converted to greyscale.
To select the rectangular region of interest we first preform preprocessing:
...
34
votes
5answers
12k views
How can I detect an ellipse in a photo?
I tried to detect the rim of the following cup as an ellipse.
I've tried the solutions given in How to find circular objects in an image? to detect the ellipse, but the detection result was not quite ...
14
votes
3answers
4k views
Line Intensity Profile From Image
I can get line profiles from images using imagej but it would be nice to be able to do this in my mathematica notebooks.
I found this
http://library.wolfram.com/examples/intensityprofiles/
after ...
2
votes
2answers
458 views
Lossless TIFF or PNG export
I'd like to export an output from MatrixPlot[], however, the output file size seems to depend on my specification of the ImageSize -> {..., ...}. How might I export a TIFF with all of the data in the ...
39
votes
7answers
2k views
Voronoi diagrams for generators other than points
Any suggestions on how to determine a Voronoi diagram for sites other than points, as e.g. in the picture below?
The input is a raster image.
20
votes
1answer
3k views
How to extract metadata from an image of a business card?
I'm trying to digitize some documents, and I came across a very cool app called camscanner app which performs parallax transform and ocr very nicely, now I'm implementing it in mathematica...
Given a ...
16
votes
4answers
2k views
Image correlation
I have two images from motor scan, Image1 is shifted by MxN pixels from Image2. How can I find the shift between Image1 and Image2 ?
Image -1
Image -2
If we compare the shift between the images in ...
17
votes
3answers
7k views
Composing an image with a plot
I'm trying to illustrate the solutions to a textbook problem dealing with quadratic functions.
This will involve plotting a quadratic and overlaying the plot and the image.
Here is the textbook scan....
11
votes
2answers
2k views
Creating an example of video image tracking
Note: Please see comments below @bobthechemist's answer for why question was edited.
I've made a video of two teams playing soccer. Now I would like to translate each soccer-player to a (x,y) ...
7
votes
3answers
582 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 ...
6
votes
1answer
447 views
HOWTO encode/decode large chunks of Mathematica code/results e.g. for posting on sites?
At times, we as questioners would like to post huge Mathematica-expressions to websites (e.g. mathematica.stackexchange.com), or have an easy way to get such code from a site. Above a certain size, <...
13
votes
3answers
1k views
Best method to find variation in width along the image of a slit?
EDIT: Solutions by @Alexey Popkov and @Vitaliy Kaurov are very intuitive and both can be used to find a solution for the task.
I have a slit of 15-18 microns by 1 mm projected with magnified 4X onto ...
5
votes
2answers
296 views
Force size in pixels of plot area excluding axes and labels
I have a matrix where each element represents a pixel. I want to plot the matrix (possibly with ArrayPlot). To suppress aliasing in the final graphic (which I will ...
7
votes
1answer
520 views
How to increase the image resolution of a map?
I'd like to obtain higher-resolution geographic maps retrieved from Wolfram geo server, since the standard resolution seems poor.
I tried to increase the "TileSize" parameter, like this:
...
8
votes
3answers
852 views
How can I capture a rectangular area from an image?
I am looking for a method to extract rectangular areas from an image. The image is divided up into rectangular problem spaces like the image shown below. Each numbered problem is given with some text ...
5
votes
2answers
171 views
Problem with Raster and custom ColorTable
Context
Let me define two colour tables: (which come from brewer and xmedcom respectively)
...
10
votes
1answer
1k views
transparency in image used for texture?
Is there a way to set a transparancy channel in a raster image used for a texture in 3d graphics?
this creates a raster image with a transparency channel:
...
5
votes
2answers
370 views
Cannot change ImageResolution after applying ImagePad [duplicate]
I want to export high-resolution images of a plot I'm making. The trouble is, the plot has a lot of extra white space around it which I get rid of via ImagePad (I ...
10
votes
4answers
394 views
Why do quote marks appear in output when saved with Save Selection As?
Update #2: This behavior has been confirm across platforms and in multiple versions. Therefore:
Is this a bug or a feature?
Can I disable this "feature" so that copying a selection of Cell contents ...
6
votes
0answers
306 views
Bug report: Attempting to Save Selection As… in a magnified Notebook fails with errors [duplicate]
Bug introduced in 9.0.1 or earlier and persisting through 10.0.2 or later
I have found that attempting to Save Selection As... in a magnified Notebook fails with errors.
On my system it can be ...
6
votes
2answers
700 views
Rectangle with rounded edges
Inspired from :
Fit an image within a Rectangle [] in Graphics
I would like now to fit an image within a Rectangle[] with rounded edges as shown in the example below :
Is it possible ?
0
votes
1answer
638 views
Reverse after ImageData? [duplicate]
Why should we do a Reverse on the image data after an ImageTake ?
For example:
...
25
votes
2answers
4k views
How to automatically remove text from images?
I'd like to remove the text in the center of images automatically. To use Inpaint[], you need a mask, but I don't have one. So really the problem is:
How to build ...
23
votes
1answer
4k views
How can I detect if an image is of poor quality?
I need to filter out blurry or otherwise bad quality images from a set. I would like an efficient method to detect images that have any of the following three attributes:
Out of focus or motion blur
...
21
votes
2answers
1k views
Why does ImageData need four times more memory?
Background
We are dealing with very large TIFF image files that are imported, processed and exported using Mathematica 9.0.1. Many of our algorithms only work with an array representation of the ...
14
votes
1answer
2k views
Enlarge an image and increase its resolution
An ongoing purely recreational project. I got my introduction to image processing with this Rotating perspective... question and had a lot of fun with it.
Now I want to take it to the next step.
...
10
votes
2answers
796 views
Band Intensity Quantification
I would like to measure the density of my western blot band by measuring the area under the peak from this plot.
More specifically, my image will have several lanes with a pattern of bands in each ...
18
votes
1answer
2k views
Slow import of multigigabyte TIF image stacks
Update 6: After contacting Wolfram Technical Support, I was advised that the frame-to-frame import timing variability can be eliminated by reading in the frame stack from frame to frame with the ...
5
votes
2answers
3k views
Generating x,y coordinates for an edge detection
I'd like to be able to process a number of graphics that have edge contours and output a list of $x$, $y$ coordinates to be used for generating a spline in another program, or in Mathematica, to make ...
14
votes
3answers
5k views
Nontrivial background removal
I have an image of a product on a poorly made green screen and need to segment out just the product:
The problem is that it contains a mirror, so simple color-based methods are not enough.
I tried ...
12
votes
2answers
565 views
How could I use Mathematica to remove finger tips that appear in images?
I used my photo camera to "scan" a heavy dictionary. I tried to have flat images by pressing the margins of the pages with my fingers.
The color of the background is (normally) black and my fingers ...
11
votes
2answers
1k views
Detecting edge/region in contour plot
I am interested in improving this plot:
which I produced with the following command:
...
10
votes
1answer
678 views
How to implement a free version of WebImageSearch?
I really don't like functions that I have to pay for, if they can be implemented for free.
Is there a way to get around this pay-wall for WebImageSearch? Perhaps using some other free api or service?
...
6
votes
2answers
3k views
How can I put an image on a surface [duplicate]
I want to paste an image on the surface of a 3D plot. For example consider this image which I want to paste on the surface of this sphere
...
18
votes
1answer
359 views
Color degrades when using Copy As Bitmap
I have discovered a problem that affects my use of Mathematica. When I use the menu command Edit > Copy As > Bitmap the colors in the copy are subtly degraded. To make this more apparent I copied ...
10
votes
1answer
541 views
How to patch fingerprint ridges
I get a fingerprint:
But as you see,there are some place is discontinuous,such as:
The question is how to patch the discontinuous line according its gradient?The only one thing that I can think it ...
13
votes
1answer
257 views
What governs images resizing in the FrontEnd environment
What is responsible for the middle Row images' size? And why single image row is different?
...
6
votes
1answer
372 views
Trace one point's coordinate values in sequentially images
I am a research student in a university. I think I need some help.
I used a video camera to monitor the vibration of a plank. Then I should calculate the amplitude and frequency of the vibration ...
4
votes
1answer
2k views
Detection of horizontal lines in an image
Ok I'm trying to detect horizontal lines in an image. But the problem is that the line is quite obscure. So I'm not sure if it is even possible to extract that. I tried many different filters, but ...
