Posted in Python onJune 04, 2020
要求
存在一个文件夹内有若干张图像,需要计算每张图片的RGB均值,并计算全部图像的RGB均值。
代码
# -*- coding: utf-8 -*- """ Created on Thu Nov 1 10:43:29 2018 @author: Administrator """ import os import cv2 import numpy as np path = 'C:/Users/Administrator/Desktop/rgb' def compute(path): file_names = os.listdir(path) per_image_Rmean = [] per_image_Gmean = [] per_image_Bmean = [] for file_name in file_names: img = cv2.imread(os.path.join(path, file_name), 1) per_image_Bmean.append(np.mean(img[:,:,0])) per_image_Gmean.append(np.mean(img[:,:,1])) per_image_Rmean.append(np.mean(img[:,:,2])) R_mean = np.mean(per_image_Rmean) G_mean = np.mean(per_image_Gmean) B_mean = np.mean(per_image_Bmean) return R_mean, G_mean, B_mean if __name__ == '__main__': R, G, B= compute(path) print(R, G ,B)
这里需要注意cv2.imread()读取顺序为BGR问题。
注意
路径不能出现中文,不然容易出错。
错误如下:
TypeError: 'NoneType' object is not subscriptable
结果
补充知识:Image得到图片像素的RGB
我就废话不多说了,大家还是直接看代码吧!
from PIL import Image image = Image.open('./3.png') print(image)#查看mode是否等于RGB, image_rgb = image.convert("RGB") image_rgb.getcolors()
打印结果
<PIL.PngImagePlugin.PngImageFile image mode=P size=500x332 at 0x7F53383FADA0> [(10990, (192, 0, 128)),#10990表示像素总数,(192, 0, 128)表示RGB值 (7589, (224, 224, 192)), (5706, (192, 128, 128)), (3913, (0, 64, 0)), (137802, (0, 0, 0))]
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Python实现计算图像RGB均值方式
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