iipsrv  1.1
iipsrv is an advanced high-performance feature-rich image server for web-based streamed viewing and zooming of ultra high-resolution images
Transform Struct Reference

Image Processing Transforms. More...

#include <Transforms.h>

Public Member Functions

std::string getDescription ()
 Get description of processing engine.
 
void normalize (RawTile &in, const std::vector< float > &max, const std::vector< float > &min)
 Function to create normalized array. More...
 
void cmap (RawTile &in, enum cmap_type cmap)
 Function to apply colormap to gray images. More...
 
void inv (RawTile &in)
 Function to invert colormaps. More...
 
void shade (RawTile &in, int h_angle, int v_angle)
 Hillshading function to simulate raking light images. More...
 
void LAB2sRGB (RawTile &in)
 Convert from CIELAB to sRGB colour space. More...
 
void contrast (RawTile &in, float c)
 Function to apply a contrast adjustment and clip to 8 bit. More...
 
void gamma (RawTile &in, float g)
 Apply a gamma correction. More...
 
void interpolate_nearestneighbour (RawTile &in, unsigned int w, unsigned int h)
 Resize image using nearest neighbour interpolation. More...
 
void interpolate_bilinear (RawTile &in, unsigned int w, unsigned int h)
 Resize image using bilinear interpolation. More...
 
void rotate (RawTile &in, float angle)
 Rotate image - currently only by 90, 180 or 270 degrees, other values will do nothing. More...
 
void greyscale (RawTile &in)
 Convert image to grayscale. More...
 
void twist (RawTile &in, const std::vector< std::vector< float > > &ctw)
 Apply a color twist. More...
 
void flatten (RawTile &in, int bands)
 Extract bands. More...
 
void flip (RawTile &in, int o)
 Flip image. More...
 
std::vector< unsigned int > histogram (RawTile &in, const std::vector< float > &max, const std::vector< float > &min)
 Calculate histogram of an image. More...
 
unsigned char threshold (std::vector< unsigned int > &histogram)
 Calculate threshold for binary (bi-level) segmentation. More...
 
void binary (RawTile &in, unsigned char threshold)
 Create binary (bi-level) image. More...
 
void equalize (RawTile &in, std::vector< unsigned int > &histogram)
 Apply histogram equalization to an image. More...
 

Detailed Description

Image Processing Transforms.

Member Function Documentation

◆ binary()

void Transform::binary ( RawTile in,
unsigned char  threshold 
)

Create binary (bi-level) image.

Parameters
ininput image
thresholdthreshold for binary image segmentation

Referenced by getDescription().

◆ cmap()

void Transform::cmap ( RawTile in,
enum cmap_type  cmap 
)

Function to apply colormap to gray images.

Parameters
intile data to be converted
cmapcolor map to apply.

Referenced by getDescription().

◆ contrast()

void Transform::contrast ( RawTile in,
float  c 
)

Function to apply a contrast adjustment and clip to 8 bit.

Parameters
intile data to be adjusted
ccontrast value

Referenced by getDescription().

◆ equalize()

void Transform::equalize ( RawTile in,
std::vector< unsigned int > &  histogram 
)

Apply histogram equalization to an image.

Parameters
ininput image
histogramimage histogram

Referenced by getDescription().

◆ flatten()

void Transform::flatten ( RawTile in,
int  bands 
)

Extract bands.

Parameters
ininput image
bandsnumber of bands

Referenced by getDescription().

◆ flip()

void Transform::flip ( RawTile in,
int  o 
)

Flip image.

Parameters
ininput image
oorientation (0=horizontal,1=vertical)

Referenced by getDescription().

◆ gamma()

void Transform::gamma ( RawTile in,
float  g 
)

Apply a gamma correction.

Parameters
intile input data
ggamma

Referenced by getDescription().

◆ greyscale()

void Transform::greyscale ( RawTile in)

Convert image to grayscale.

Parameters
ininput image

Referenced by getDescription().

◆ histogram()

std::vector<unsigned int> Transform::histogram ( RawTile in,
const std::vector< float > &  max,
const std::vector< float > &  min 
)

Calculate histogram of an image.

Parameters
ininput image
maxmax image values for each channel
minmin image values for each channel
Returns
vector containing histogram (single histogram for all channels)

Referenced by getDescription().

◆ interpolate_bilinear()

void Transform::interpolate_bilinear ( RawTile in,
unsigned int  w,
unsigned int  h 
)

Resize image using bilinear interpolation.

Parameters
intile input data
wtarget width
htarget height

Referenced by getDescription().

◆ interpolate_nearestneighbour()

void Transform::interpolate_nearestneighbour ( RawTile in,
unsigned int  w,
unsigned int  h 
)

Resize image using nearest neighbour interpolation.

Parameters
intile input data
wtarget width
htarget height

Referenced by getDescription().

◆ inv()

void Transform::inv ( RawTile in)

Function to invert colormaps.

Parameters
intile data to be adjusted

Referenced by getDescription().

◆ LAB2sRGB()

void Transform::LAB2sRGB ( RawTile in)

Convert from CIELAB to sRGB colour space.

Parameters
intile data to be converted

◆ normalize()

void Transform::normalize ( RawTile in,
const std::vector< float > &  max,
const std::vector< float > &  min 
)

Function to create normalized array.

Parameters
intile data to be adjusted
min: vector of minima
max: vector of maxima

Referenced by getDescription().

◆ rotate()

void Transform::rotate ( RawTile in,
float  angle 
)

Rotate image - currently only by 90, 180 or 270 degrees, other values will do nothing.

Parameters
intile input data
angleangle of rotation - currently only rotations by 90, 180 and 270 degrees are suported, for other values, no rotation will occur

Referenced by getDescription().

◆ shade()

void Transform::shade ( RawTile in,
int  h_angle,
int  v_angle 
)

Hillshading function to simulate raking light images.

Parameters
intile input data containing normal vectors at each point
h_angleangle in the horizontal plane from 12 o'clock in degrees
v_angleangle in the vertical plane in degrees. 0 is flat, 90 pointing directly down.

Referenced by getDescription().

◆ threshold()

unsigned char Transform::threshold ( std::vector< unsigned int > &  histogram)

Calculate threshold for binary (bi-level) segmentation.

Parameters
histogramimage histogram
Returns
threshold

Referenced by getDescription().

◆ twist()

void Transform::twist ( RawTile in,
const std::vector< std::vector< float > > &  ctw 
)

Apply a color twist.

Parameters
ininput image
ctw2D color twist matrix

Referenced by getDescription().


The documentation for this struct was generated from the following file: