ColorMaps in OpenCV 图像处理


枚举

enum cv::ColormapTypes {
cv::COLORMAP_AUTUMN = 0,
cv::COLORMAP_BONE = 1,
cv::COLORMAP_JET = 2,
cv::COLORMAP_WINTER = 3,
cv::COLORMAP_RAINBOW = 4,
cv::COLORMAP_OCEAN = 5,
cv::COLORMAP_SUMMER = 6,
cv::COLORMAP_SPRING = 7,
cv::COLORMAP_COOL = 8,
cv::COLORMAP_HSV = 9,
cv::COLORMAP_PINK = 10,
cv::COLORMAP_HOT = 11,
cv::COLORMAP_PARULA = 12,
cv::COLORMAP_MAGMA = 13,
cv::COLORMAP_INFERNO = 14,
cv::COLORMAP_PLASMA = 15,
cv::COLORMAP_VIRIDIS = 16,
cv::COLORMAP_CIVIDIS = 17,
cv::COLORMAP_TWILIGHT = 18,
cv::COLORMAP_TWILIGHT_SHIFTED = 19,
cv::COLORMAP_TURBO = 20
}
GNU Octave/MATLAB equivalent colormaps. 更多...

函数

void cv::applyColorMap ( InputArray src, OutputArray dst, int colormap)
Applies a GNU Octave/MATLAB equivalent colormap on a given image. 更多...
void cv::applyColorMap ( InputArray src, OutputArray dst, InputArray userColor)
Applies a user colormap on a given image. 更多...

详细描述

The human perception isn't built for observing fine changes in grayscale images. Human eyes are more sensitive to observing changes between colors, so you often need to recolor your grayscale images to get a clue about them. OpenCV now comes with various colormaps to enhance the visualization in your computer vision application.

In OpenCV you only need applyColorMap to apply a colormap on a given image. The following sample code reads the path to an image from command line, applies a Jet colormap on it and shows the result:

#include < opencv2/core.hpp >
using namespace cv ;
#include <iostream>
using namespace std ;
int main( int argc, const char *argv[])
{
// We need an input image. (can be grayscale or color)
if (argc < 2)
{
cerr << "We need an image to process here. Please run: colorMap [path_to_image]" << endl;
return -1;
}
Mat img_in = imread (argv[1]);
if (img_in. empty ())
{
cerr << "Sample image (" << argv[1] << ") is empty. Please adjust your path, so it points to a valid input image!" << endl;
return -1;
}
// Holds the colormap version of the image:
Mat img_color;
// Apply the colormap:
applyColorMap (img_in, img_color, COLORMAP_JET );
// Show the result:
imshow ( "colorMap" , img_color);
return 0;
}
另请参阅
ColormapTypes

枚举类型文档编制

ColormapTypes

#include < opencv2/imgproc.hpp >

GNU Octave/MATLAB equivalent colormaps.

枚举器
COLORMAP_AUTUMN
Python: cv.COLORMAP_AUTUMN
colorscale_autumn.jpg
autumn
COLORMAP_BONE
Python: cv.COLORMAP_BONE
colorscale_bone.jpg
bone
COLORMAP_JET
Python: cv.COLORMAP_JET
colorscale_jet.jpg
jet
COLORMAP_WINTER
Python: cv.COLORMAP_WINTER
colorscale_winter.jpg
winter
COLORMAP_RAINBOW
Python: cv.COLORMAP_RAINBOW
colorscale_rainbow.jpg
rainbow
COLORMAP_OCEAN
Python: cv.COLORMAP_OCEAN
colorscale_ocean.jpg
ocean
COLORMAP_SUMMER
Python: cv.COLORMAP_SUMMER
colorscale_summer.jpg
summer
COLORMAP_SPRING
Python: cv.COLORMAP_SPRING
colorscale_spring.jpg
spring
COLORMAP_COOL
Python: cv.COLORMAP_COOL
colorscale_cool.jpg
cool
COLORMAP_HSV
Python: cv.COLORMAP_HSV
colorscale_hsv.jpg
HSV
COLORMAP_PINK
Python: cv.COLORMAP_PINK
colorscale_pink.jpg
pink
COLORMAP_HOT
Python: cv.COLORMAP_HOT
colorscale_hot.jpg
hot
COLORMAP_PARULA
Python: cv.COLORMAP_PARULA
colorscale_parula.jpg
parula
COLORMAP_MAGMA
Python: cv.COLORMAP_MAGMA
colorscale_magma.jpg
magma
COLORMAP_INFERNO
Python: cv.COLORMAP_INFERNO
colorscale_inferno.jpg
inferno
COLORMAP_PLASMA
Python: cv.COLORMAP_PLASMA
colorscale_plasma.jpg
plasma
COLORMAP_VIRIDIS
Python: cv.COLORMAP_VIRIDIS
colorscale_viridis.jpg
viridis
COLORMAP_CIVIDIS
Python: cv.COLORMAP_CIVIDIS
colorscale_cividis.jpg
cividis
COLORMAP_TWILIGHT
Python: cv.COLORMAP_TWILIGHT
colorscale_twilight.jpg
twilight
COLORMAP_TWILIGHT_SHIFTED
Python: cv.COLORMAP_TWILIGHT_SHIFTED
colorscale_twilight_shifted.jpg
twilight shifted
COLORMAP_TURBO
Python: cv.COLORMAP_TURBO
colorscale_turbo.jpg
turbo

函数文档编制

applyColorMap() [1/2]

void cv::applyColorMap ( InputArray src ,
OutputArray dst ,
int colormap
)
Python:
dst = cv.applyColorMap( src, colormap[, dst] )
dst = cv.applyColorMap( src, userColor[, dst] )

#include < opencv2/imgproc.hpp >

Applies a GNU Octave/MATLAB equivalent colormap on a given image.

参数
src The source image, grayscale or colored of type CV_8UC1 or CV_8UC3.
dst The result is the colormapped source image. Note: Mat::create is called on dst.
colormap The colormap to apply, see ColormapTypes
范例:
samples/cpp/falsecolor.cpp .

applyColorMap() [2/2]

void cv::applyColorMap ( InputArray src ,
OutputArray dst ,
InputArray userColor
)
Python:
dst = cv.applyColorMap( src, colormap[, dst] )
dst = cv.applyColorMap( src, userColor[, dst] )

#include < opencv2/imgproc.hpp >

Applies a user colormap on a given image.

参数
src The source image, grayscale or colored of type CV_8UC1 or CV_8UC3.
dst The result is the colormapped source image. Note: Mat::create is called on dst.
userColor The colormap to apply of type CV_8UC1 or CV_8UC3 and size 256