Questions on the image processing capabilities implemented in Mathematica.
43
votes
1answer
3k views
Torn edge paper effect for images
In my answers to Plotting Error Bars on a Log Scale I used a so called "torn edge" effect from on one of the images. @SjoerdC.deVries commented: "BTW I liked the ripped-out look of your InputForm ...
8
votes
3answers
953 views
Saving high-quality graphics through commands
Say I make and display a graph in a Mathematica notebook:
graph = CompleteGraph[100]
If I drag the corner of the graph to increase its size, and then save it to ...
26
votes
5answers
2k views
How can I extract data points from a black and white image?
Consider the following graph (source):
Is there any way to extract the data points from this image in a semi-automatic way? I have seen, and tried the methods suggested in this question, but they ...
0
votes
1answer
253 views
How to reduce the memory necessary for the image? [duplicate]
Possible Duplicate:
Exporting graphics to PDF - huge file
I have a figure that is created to use in a paper. Here it is:
...
10
votes
1answer
416 views
Copying an image from the clipboard, modifying it and returning it to the clipboard
I have a Mathematica script to help me copy images from PDFs and then make the (presumably white or nearly white) background transparent. Typically, I am looking at the PDF in Adobe Acrobat and I ...
16
votes
1answer
606 views
Using ImageCapture to access a USB webcam in linux
Is it possible to access a USB webcam through Mathmatica on Linux? When I run
ImageCapture[]
I get the following output
...
22
votes
4answers
866 views
Clustering of space-time data
Below is an example of a gaze sequence I recorded during a 3 seconds display. That is, where the eye was at every millisecond. While we should have 3000 points, we are missing some due to blinking.
...
14
votes
3answers
405 views
Selective blurring of areas of image to make seamless tiles
I'm trying to make seamless tiles - images that can be repeated on a grid without it being obvious where the joins are.
So far, I've followed the classic strategy of getting the edges working ...
10
votes
2answers
387 views
Adding controls for multiple functions in Manipulate
I am learning Mathematica and the Image Processing functions. I have the following Manipulate procedure which works fine:
...
13
votes
3answers
463 views
Measure a DensityHistogram[] pair similarity
I study human vision and more specifically eye-movements.
"If we display 2 symmetrical patterns (20 min one after the other), will our gaze distribution be symmetric is my research question."
The 2 ...
12
votes
4answers
513 views
What is the fastest way to locate an image inside a larger image?
let b =
let c =
How to do:
find[c,b]
that returns the bounding box of c in b?
...
11
votes
2answers
502 views
Symmetrical image transformation for a kaleidoscope-type image
I've been trying to write a little kaleidoscope-type manipulate, using images rather than graphics, and using ImageTransformation as a way in. However, I'm starting ...
2
votes
4answers
899 views
How can I extract the data from an image and process it pixel by pixel?
For example, to change the color of each pixel to the mean color of the three channels, I tried
i = ExampleData[{"TestImage", "Lena"}];
Mean[i]
but it just ...
5
votes
1answer
206 views
How to determine edgeweights from width of skeleton using MorphologicalGraph (or workaround)?
Background
I'm trying to create a workaround for what seems to be a bug in MMA's graph functions related to edge weights:
SO: How to Label Graph Edges with their weights
According to MMA's ...
41
votes
3answers
2k views
Recovering data points from an image
Unfortunately, some data can only be obtained in picture form (Japanese publications anyone?). Since this cannot be worked with, it has to be converted to a dataset that can; I was wondering whether ...
6
votes
2answers
407 views
Fit an image within a Rectangle [] in Graphics
Based on the following Code (yet the white text in the image is added with PPT), I would like to have an image fit within one of the rectangle.
For Example the image from there :
...
18
votes
3answers
745 views
How to make a drop-shadow for Graphics3D objects
What's the best way to make a drop shadow for a 3D object?
image = Graphics3D[Sphere[], Boxed -> False]
I can get a blurry black outline of this:
...
5
votes
3answers
271 views
Tile image on specific location without space between them [duplicate]
Possible Duplicate:
How to combine images with the same dimensions in a grid?
I would like to arrange images without any space between their edges as each piece is made to connect with ...
12
votes
2answers
179 views
Tuning ParallelMap when IO and computationally bound
I'm currently doing work on processing a number of images taken frame-by-frame from a video. As a result, I have a directory of around 16K PNG images that at most ~300K.
That said, I have a routine, ...
13
votes
2answers
558 views
How to combine images with the same dimensions in a grid?
I have the following images, both 480 x 270 pixels:
I'd like to stitch them side by side in a 960 x 270 pixel image like so (scaled down):
So far, I've been using ...
11
votes
3answers
436 views
Image levels: how to alter 'exposure' of dark and light areas?
I was working with some less than ideal photographs, and wanted to adjust them before continuing. I wanted to raise the levels of the very dark areas and lower the levels of the very light areas. I ...
12
votes
1answer
239 views
ImageAlign doesn't always work correctly
I've been working with ImageAlign in Mathematica 8 and I'm having trouble getting it working reliably. Perhaps there are some subtleties that I'm not yet aware of? ...
