Engauge Digitizer  2
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ColorFilter Class Reference

Class for filtering image to remove unimportant information. More...

#include <ColorFilter.h>

Public Member Functions

 ColorFilter ()
 Single constructor.
 
bool colorCompare (QRgb rgb1, QRgb rgb2) const
 See if the two color values are close enough to be considered to be the same.
 
void filterImage (const QImage &imageOriginal, QImage &imageFiltered, ColorFilterMode colorFilterMode, double low, double high, QRgb rgbBackground)
 Filter the original image according to the specified filtering parameters.
 
QRgb marginColor (const QImage *image) const
 Identify the margin color of the image, which is defined as the most common color in the four margins. More...
 
bool pixelFilteredIsOn (const QImage &image, int x, int y) const
 Return true if specified filtered pixel is on.
 
double pixelToZeroToOneOrMinusOne (ColorFilterMode colorFilterMode, const QColor &pixel, QRgb rgbBackground) const
 Return pixel converted according to the current filter parameter, normalized to zero to one. More...
 
bool pixelUnfilteredIsOn (ColorFilterMode colorFilterMode, const QColor &pixel, QRgb rgbBackground, double low0To1, double high0To1) const
 Return true if specified unfiltered pixel is on.
 
int zeroToOneToValue (ColorFilterMode colorFilterMode, double s) const
 Inverse of pixelToZeroToOneOrMinusOne.
 

Detailed Description

Class for filtering image to remove unimportant information.

Definition at line 20 of file ColorFilter.h.

Member Function Documentation

◆ marginColor()

QRgb ColorFilter::marginColor ( const QImage *  image) const

Identify the margin color of the image, which is defined as the most common color in the four margins.

For speed, only pixels in the four borders are examined, with the results from those borders safely representing the most common color of the entire margin areas.

Definition at line 73 of file ColorFilter.cpp.

◆ pixelToZeroToOneOrMinusOne()

double ColorFilter::pixelToZeroToOneOrMinusOne ( ColorFilterMode  colorFilterMode,
const QColor &  pixel,
QRgb  rgbBackground 
) const

Return pixel converted according to the current filter parameter, normalized to zero to one.

Special case is -1 for a pixel that cannot be converted, like finding hue value for gray scale pixel

Definition at line 171 of file ColorFilter.cpp.


The documentation for this class was generated from the following files: