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OpenCV中的颜色查找表LUT

 2 years ago
source link: https://xugaoxiang.com/2022/07/09/opencv-lut/
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LUT 即 Look Up Table 查找表，它是一种 像素值映射表，主要是用来增强图像的对比度。

20025407eb1e98d2.png

由上图中可以看到

  • 原图中像素值为40的像素，经过查找表映射后值变为90
  • 原图中像素值为30的像素，经过查找表映射后值变为10

经过变换后，就会得到一张对比度变高的图像。

OpenCV 中 applyColorMap(src, dst, COLORMAP) 可以实现图像的彩色变换

其中参数：

  • src 表示输入图像
  • dst表示输出图像
  • 颜色LUT， OpenCV支持22种颜色风格的查找表映射
COLORMAP_AUTUMN: int
COLORMAP_BONE: int
COLORMAP_CIVIDIS: int
COLORMAP_COOL: int
COLORMAP_DEEPGREEN: int
COLORMAP_HOT: int
COLORMAP_HSV: int
COLORMAP_INFERNO: int
COLORMAP_JET: int
COLORMAP_MAGMA: int
COLORMAP_OCEAN: int
COLORMAP_PARULA: int
COLORMAP_PINK: int
COLORMAP_PLASMA: int
COLORMAP_RAINBOW: int
COLORMAP_SPRING: int
COLORMAP_SUMMER: int
COLORMAP_TURBO: int
COLORMAP_TWILIGHT: int
COLORMAP_TWILIGHT_SHIFTED: int
COLORMAP_VIRIDIS: int
COLORMAP_WINTER: int

最后看个示例

import cv2

image = cv2.imread('lenna.png')
cv2.imshow('original image', image)

# 变换到深绿色
dst = cv2.applyColorMap(image, cv2.COLORMAP_DEEPGREEN)
cv2.imshow('dst image', dst)

cv2.waitKey(0)

cv2.destroyAllWindows()

report

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