Helix Pseudocolor Algorithm C++ by Fran Piernas Diaz
About HPC
HPC is a simple implementation of a pseudocolor algorithm I called Helix algorithm. It tries to highlight the most opaque parts to X-Rays, attenuating the most transparent but without saturating the color of the result.
The equations used are these:
The parameters are:
t: brighness of a pixel [0,255]
rho_max: color saturation [0,140] (0 gives grayscale values, 140 is the most saturated color and the recommended value)
Example
Pseudocolor of a Hard Disk Drive radiography using different thresholds.
Requirements
OpenCV must be installed. To compile, link all OpenCV libraries.
How to include it to your project
Place "hpc.hpp" to the same directory as your source code and include it: #include "hpc.hpp"
Usage to pseudocolor an image using a single threshold, call this function:
Mat xfcs_fframe(Mat sample_i,
int saturation,
int threshold)
where:
sample is the image to color
saturation is the color saturation from 0 to 140
threshold is the desired threshold. Low thresholds remove transparent parts
Usage to pseudocolor an image with preview of the result, call this function:
void fframe_single_threshold(string file,
int saturation)
where:
file is the string of the path to the image
saturation is the color saturation from 0 to 140
Use the "+" and "-" keys (not those of the numpad) and press enter to select the threshold.
Usage to pseudocolor an image with a range of thresholds from 10 to 254, call this function:
void threshold_range(string file,
int saturation)
where:
file is the string of the path to the image
saturation is the color saturation from 0 to 140
Before using this function, create a file named "output_set", that's where the images will be saved.