Align Histogram
The Align Histogram module is a useful precursor to any image comparison routines
such as template matching, cross correlation, stereo depth or simple image subtraction. The
module takes as input two images and will align the colors in the "source" image
with those specified in the "target" image. Thus if you wish to compare images
with respect to colors this module will provide a way to greatly reduce
different lighting and color shift effects that can happen between two successive
image captures or even in simultaneous capture by different cameras.
Interface
Instructions
1. Source - Select the source image or the image that should be transformed into the target's colors/intensity.
2. Target - Select the target image or the image that has the "right" colors/intensity. Note that if no
target image is specified the source image is transformed into a standard histogram where the
red, green and blue channels are normalized.
3. Overlay - If your source image has had a color remapping relative to the target in a non-linear way you may want
to chose the "Align using overlap occurance count" which will compare pixels in the source and target at the exact
same location and use the combination that is most frequent in the two images. Thus if a red pixel in the source
image is always in the same location as a blue pixel then the source image red pixel will be mapped/converted
to a blue pixel to best match the target image. This is useful in situations where you would like to compare
the two images and ensure that the source is as close as possible to the target image without actually changing
the pixels location.
Example
| Source | Default Alignment (no target) |
 |  |
| Target | Source | Align Histogram |
 |  |  |
 |  |  |
|  |  |
 Click Here to load a robofile that was used to produce the above alignment using the source and target image.
You can specify the image to align to in the Load Module within that robofile and then just drag/drop
images that you want to transform into the main RoboRealm GUI interface.
See Also
Color Balance
| Align_Histogram Related Forum Posts | Last post | Posts | Views |
Real-time image enhancement with RR?
This might be a bit off topic, but I was wondering if RoboRealm might be used for something like "real-time image enhancement"... |
9 months |
3 |
391 |
Newbie question
Hello all,
I am currently trying to build a led pick and place machine, but in order to place the... |
10 months |
11 |
478 |
Thanks for the Align Histogram module!
Hey STeven,
Congrats on releasing the new Align_Histogram module--and thanks! This is go... |
11 months |
1 |
419 |
|
