Tag for questions about bitmapped graphics, particularly those using the Image function.
21
votes
3answers
613 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 ...
13
votes
2answers
1k views
How to find circular objects in an image?
How could I use morphological processing to find circular objects in an image? More specifically, I need to detect road signs.
I need to get the "80 speed limit" sign from this image:
14
votes
4answers
878 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. I wrote the following ...
7
votes
2answers
232 views
Rasterizing a plot make axes ticks invisible
I've evaluated this code:
plot = Plot[x, {x, 0, 10}];
g = Rasterize[plot, ImageResolution -> 300];
Everything looks good except the ticks (on the axes); they ...
5
votes
2answers
256 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 ?
12
votes
2answers
588 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:
...
12
votes
1answer
343 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 ...
13
votes
1answer
194 views
High memory use while exporting a BMP
Something mysterious is going on when exporting images. I'm using Mathematica 9.0.1 on Windows 7 (64 bit), and find that the memory use is excessive when exporting to a bmp. But it doesn't happen ...
10
votes
1answer
429 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.
...
9
votes
1answer
159 views
Precise cropping with ImageCrop
The built-in ImageCrop function "effectively removes borders from image whose pixel value distribution is almost uniform" (emphasis mine). I need an efficient ...
17
votes
1answer
278 views
When exporting an (animated) GIF, is it possible to specify the size of the color palette?
I've exported an animation to animated GIF, which generated a 15mb file. I've been asked if I could regenerate the file, limiting it to only 16 colors, but I can't find any documentation on how I ...
11
votes
3answers
335 views
How to mark an image?
How can I place a mark, like a cross-hair (to suggest "X marks the spot") and a text label associated with it, at a particular position on an image (mine in particular is ...
8
votes
3answers
441 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 ...
4
votes
2answers
61 views
Problem with Raster and custom ColorTable
Context
Let me define two colour tables: (which come from brewer and xmedcom respectively)
...
3
votes
1answer
68 views
Resampling when using image as Texture
How to get sharp pixel boundaries with Texture? I'd like to have only black/white in the example below, no gray.
...
