Tagged Questions
3
votes
1answer
65 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.
...
2
votes
2answers
159 views
How can I import images from a Microsoft SQLServer database?
I have a table with binary data (images) in Microsoft SQlServer. I want to import that data and convert it into Image format. I wrote the following code, but it's ...
3
votes
1answer
217 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 ...
5
votes
4answers
279 views
How can I return the color at a coordinate in an image?
I have an imported and cropped image:
TestPicture = Import["filepath.jpg"];
TestPictureCropped = ImageCrop[TestPicture, Min[ImageDimensions[TestPicture]]];
How ...
8
votes
3answers
416 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 ...
5
votes
1answer
78 views
Scaling an image with “Drawing Tools” primitives on it
Imagine I doodle with the "Drawing tools" pen, or place lines on an image after importing it. Now say I want to scale this image by some constant factor $C$ while maintaining the same aspect ratio. ...
2
votes
2answers
147 views
Introduction of bias during brightness and contrast manipulation of an image
Quoting from Nature magazine's "Image integrity" guidelines:
Processing (such as changing brightness and contrast) is appropriate
only when it is applied equally across the entire image and is ...
12
votes
2answers
582 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:
...
18
votes
5answers
590 views
Voronoi diagrams for generators other than points
Any suggestions how to determine Voronoi diagram for sites other than points, as e.g. in the picture below? Input is a raster image.
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 ...
0
votes
0answers
74 views
Binarize a byte-formatted image
I have an image that I've imported as type "Byte" (I need to work with pixel values in this format). Let's just say the image is
...
3
votes
1answer
154 views
Filter bright dots from the gradient of the image
I am wondering to how to filter bright dots from background noise. I have used gradient filter in mathematica but it doesnt help, is anyway I can plot Intensity versus background noise with threshold ...
12
votes
1answer
342 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 ...
2
votes
2answers
164 views
HSB -> HSL Converter
Starting from an image I would like to apply a custom filter to an image.
I have thought and implemented this filter in HSL space and it goes like this :
Boost the saturation of the pixels that ...
16
votes
2answers
346 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. Many of our algorithms only work with an array representation of the images, ...
4
votes
2answers
153 views
How can I superimpose points or disks on an image at specified coordinates?
I have a TIFF image of 640 x 640 pixels, over which I would like to plot a list of points or disks of small radius.
I have been testing different alternatives and I found ImageCompose command.
...
11
votes
2answers
648 views
Push-pin Art – Convert image to R-Y-B-W-Blk color space
After seeing an example of what is called “Push-pin Art”, I assumed that Mathematica would be able to handle the kind of image processing required to convert an image to this format. I am not well ...
0
votes
0answers
60 views
How to make 3d solid volume from set of images [duplicate]
Possible Duplicate:
How to show solid bodies using volumetric rendering?
I have a set of images, and I want to construct a z-stack, then reconstruct it to a 3d volume.
My previous ...
13
votes
2answers
991 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:
10
votes
1answer
426 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.
...
14
votes
2answers
692 views
How can I create a glass distortion effect in an image?
I'd like to overlay a glass jar onto an image with realistic light bending. Can anyone think of a way to automate this effect (perhaps this can be done with the raytracing package rayica)?
19
votes
1answer
909 views
Is there a way to convert an image into a Graph?
I'm trying to convert an image with several overlapping dots into a Graph. The goal is to be able to derive the Kirchhoff matrix for the randomly created "network ...
