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Python 图像实战:三阶颜色矩特征提取与直方图可视化对比

  • 2026-06-30 14:44:27
Python 图像实战:三阶颜色矩特征提取与直方图可视化对比

Python 图像实战:三阶颜色矩特征提取与直方图可视化对比

Python 图像实战|三阶颜色矩特征提取 + 直方图可视化对比

unsetunset 前言unsetunset

在图像识别、图像检索、植物分类、目标检测任务中,颜色特征是最基础、最常用的底层特征。 而颜色矩凭借计算简单、无需复杂预处理的优势,成为颜色特征提取的经典算法。

今天带大家用 Python + OpenCV 实现: 

✅ 三通道(BGR)三阶颜色矩计算

 ✅ 局部图像裁剪,去除背景干扰 

✅ 两张图像颜色特征直方图对比 

✅ 硬核代码通俗化拆解,告别看不懂的推导式


unsetunset📌 一、什么是三阶颜色矩?unsetunset

颜色矩通过统计像素颜色分布规律,描述图像色彩信息,分为 3 个维度:

  1. 一阶矩(均值)描述图像整体平均色彩、明暗程度

  2. 二阶矩(标准差)描述颜色分布的离散、波动程度

  3. 三阶矩(偏度)描述颜色分布的对称程度

我们对 B、G、R 三个通道 分别计算 3 阶矩,最终得到 9 维颜色特征向量


unsetunset🛠 二、环境依赖unsetunset

本次实验需要 3 个核心库,提前安装:

pip install opencv-python numpy matplotlib

导入依赖:

import cv2import numpy as npimport matplotlib.pyplot as plt

unsetunset 三、核心代码分步讲解unsetunset

1. 自定义颜色矩提取函数

defcolor_moments(img, trans_hsv=False):# 可选:切换为HSV颜色空间if trans_hsv == True:        img = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)# 分离图像三个通道    f, s, t = cv2.split(img)    color_feature = []# ========== 一阶矩:均值 ==========    f_mean = np.mean(f)    s_mean = np.mean(s)    t_mean = np.mean(t)    color_feature.extend([f_mean, s_mean, t_mean])# ========== 二阶矩:标准差 ==========    f_std = np.std(f)    s_std = np.std(s)    t_std = np.std(t)    color_feature.extend([f_std, s_std, t_std])# ========== 三阶矩:偏度 ==========    f_skewness = np.mean(abs(f - f.mean()) ** 3)    s_skewness = np.mean(abs(s - s.mean()) ** 3)    t_skewness = np.mean(abs(t - t.mean()) ** 3)    f_thirdMoment = f_skewness ** (1. / 3)    s_thirdMoment = s_skewness ** (1. / 3)    t_thirdMoment = t_skewness ** (1. / 3)    color_feature.extend([f_thirdMoment, s_thirdMoment, t_thirdMoment])return color_feature

2. 读取图像 + 局部裁剪

直接整张图片计算会受背景影响,裁剪目标区域提升特征准确度:

# 读取图像(OpenCV 默认 BGR 格式)img1 = cv2.imread('../data/leaf1.jpg')img2 = cv2.imread('../data/leaf2.jpg')# 裁剪固定区域:[行起始:行结束, 列起始:列结束]img1 = img1[188238275325, :]img2 = img2[69119108158, :]

3. 提取两张图像的颜色特征

img1_feature = color_moments(img1)img2_feature = color_moments(img2)

unsetunset 四、重点难点:标签生成代码通俗改造unsetunset

原代码精简写法(双层列表推导式),新手很难理解:

# 精简写法,看不懂版本labels = [i + j for i in ['一阶''二阶''三阶'for j in ['B''G''R']]

✅ 改造后:基础 for 循环,直白易懂逻辑完全一致,适合初学者理解双层循环逻辑:

# 定义阶数、通道order_list = ['一阶''二阶''三阶']channel_list = ['B''G''R']# 新建空列表存放标签labels = []# 外层循环:遍历一二三阶for order in order_list:# 内层循环:遍历B/G/R通道for ch in channel_list:# 字符串拼接,加入标签列表        labels.append(order + ch)

最终自动生成 9 个一一对应的坐标轴标签:

unsetunset 五、绘制对比直方图unsetunset

双柱状图并列展示两张树叶图像的颜色矩差异:

x = np.arange(9)fs = 15# 字体大小plt.figure(figsize=(74))# 左右偏移,防止柱子重叠plt.bar(x - 0.15, img1_feature, width=0.3, label='leaf1')plt.bar(x + 0.15, img2_feature, width=0.3, label='leaf2')plt.xticks(x, labels, fontsize=fs)plt.xlabel('各阶颜色矩', fontsize=fs)plt.legend()plt.tight_layout()plt.show()

unsetunset六、完整整合源码unsetunset

复制即可直接运行,修改图片路径就能替换自定义图片:

import cv2import numpy as npimport matplotlib.pyplot as pltdefcolor_moments(img, trans_hsv=False):if trans_hsv == True:        img = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)    f, s, t = cv2.split(img)    color_feature = []# 一阶矩    f_mean = np.mean(f)    s_mean = np.mean(s)    t_mean = np.mean(t)    color_feature.extend([f_mean, s_mean, t_mean])# 二阶矩    f_std = np.std(f)    s_std = np.std(s)    t_std = np.std(t)    color_feature.extend([f_std, s_std, t_std])# 三阶矩    f_skewness = np.mean(abs(f - f.mean()) ** 3)    s_skewness = np.mean(abs(s - s.mean()) ** 3)    t_skewness = np.mean(abs(t - t.mean()) ** 3)    f_thirdMoment = f_skewness ** (1. / 3)    s_thirdMoment = s_skewness ** (1. / 3)    t_thirdMoment = t_skewness ** (1. / 3)    color_feature.extend([f_thirdMoment, s_thirdMoment, t_thirdMoment])return color_featureif __name__ == '__main__':# 读取并裁剪图像    img1 = cv2.imread('../data/leaf1.jpg')    img2 = cv2.imread('../data/leaf2.jpg')    img1 = img1[188238275325, :]    img2 = img2[69119108158, :]# 提取颜色矩特征    img1_feature = color_moments(img1)    img2_feature = color_moments(img2)# 通俗易懂方式生成坐标轴标签    order_list = ['一阶''二阶''三阶']    channel_list = ['B''G''R']    labels = []for order in order_list:for ch in channel_list:            labels.append(order + ch)# 绘图    x = np.arange(9)    fs = 15    plt.figure(figsize=(74))    plt.bar(x - 0.15, img1_feature, width=0.3, label='leaf1')    plt.bar(x + 0.15, img2_feature, width=0.3, label='leaf2')    plt.xticks(x, labels, fontsize=fs)    plt.xlabel('各阶颜色矩', fontsize=fs)    plt.legend()    plt.tight_layout()    plt.show()

unsetunset 七、知识点总结unsetunset

  1. 颜色矩是轻量化颜色特征,广泛用于课程设计、图像检索、分类作业;

  2. 图像裁剪可屏蔽背景干扰,大幅提升特征有效性;

  3. 复杂列表推导式,可拆解为双层 for 循环,降低学习门槛;

  4. 双柱状图是多维特征对比最直观的可视化方案。


unsetunset🎯 适用场景unsetunset

  • 数字图像处理课程实验

  • 计算机视觉入门练习

  • 植物识别、物品分类小项目

  • 本科课程设计 / 结课作业

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  1. CONNECT:[ UseTime:0.000553s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000639s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.012740s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000336s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000687s ]
  6. SELECT * FROM `set` [ RunTime:0.000285s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000756s ]
  8. SELECT * FROM `article` WHERE `id` = 491425 LIMIT 1 [ RunTime:0.005048s ]
  9. UPDATE `article` SET `lasttime` = 1783072865 WHERE `id` = 491425 [ RunTime:0.008380s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000312s ]
  11. SELECT * FROM `article` WHERE `id` < 491425 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.026359s ]
  12. SELECT * FROM `article` WHERE `id` > 491425 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007623s ]
  13. SELECT * FROM `article` WHERE `id` < 491425 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.039914s ]
  14. SELECT * FROM `article` WHERE `id` < 491425 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.023969s ]
  15. SELECT * FROM `article` WHERE `id` < 491425 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.028618s ]
0.225215s