opencv: cv2.applyColorMap 僞色彩

用途

在圖像處理中，僞色彩用途廣泛。在OpenCV庫中，常見的僞色彩模式都可通過 cv2.applyColorMap(src, userColor[, dst]) 直接調用，很是方便快捷。

例如僞色彩中的 COLORMAP_JET模式，就常被用於生成我們所常見的 熱力圖：

Syntax

cv2.applyColorMap(src, userColor[, dst])

Args:

COLORMAP_AUTUMN = 0,
COLORMAP_BONE = 1,
COLORMAP_JET = 2,
COLORMAP_WINTER = 3,
COLORMAP_RAINBOW = 4,
COLORMAP_OCEAN = 5,
COLORMAP_SUMMER = 6,
COLORMAP_SPRING = 7,
COLORMAP_COOL = 8,
COLORMAP_HSV = 9,
COLORMAP_PINK = 10,
COLORMAP_HOT = 11

Demo

原圖：

僞色彩圖：

COLORMAP_AUTUMN = 0：

COLORMAP_BONE = 1：

COLORMAP_JET = 2：

COLORMAP_WINTER = 3：

COLORMAP_RAINBOW = 4：

COLORMAP_OCEAN = 5：

COLORMAP_SUMMER = 6：

COLORMAP_SPRING = 7：

COLORMAP_COOL = 8：

COLORMAP_HSV = 9：

COLORMAP_PINK = 10：

COLORMAP_HOT = 11：

12：

Code

附上自己寫的實驗代碼：

import cv2

# COLORMAP_AUTUMN = 0,
# COLORMAP_BONE = 1,
# COLORMAP_JET = 2,
# COLORMAP_WINTER = 3,
# COLORMAP_RAINBOW = 4,
# COLORMAP_OCEAN = 5,
# COLORMAP_SUMMER = 6,
# COLORMAP_SPRING = 7,
# COLORMAP_COOL = 8,
# COLORMAP_HSV = 9,
# COLORMAP_PINK = 10,
# COLORMAP_HOT = 11

img = cv2.imread("girl.jpg")
for i in range(0, 13):
    im_color = cv2.applyColorMap(img, i)
    cv2.imwrite("{}.jpg".format(i), im_color)