From b7f66dd8c354d1b72f657d74085560d3fc318178 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=8E=E4=BD=B3=E8=B1=AA?=
 <2509165033@student.example.com>
Date: Thu, 16 Apr 2026 15:43:44 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E6=96=87=E4=BB=B6=E8=87=B3?=
 =?UTF-8?q?=20/?=
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---
 ljh.py  | 29 +++++++++++++++++++++++++++++
 ljh1.py | 28 ++++++++++++++++++++++++++++
 ljh2.py | 22 ++++++++++++++++++++++
 3 files changed, 79 insertions(+)
 create mode 100644 ljh.py
 create mode 100644 ljh1.py
 create mode 100644 ljh2.py

diff --git a/ljh.py b/ljh.py
new file mode 100644
index 0000000..c4b86e1
--- /dev/null
+++ b/ljh.py
@@ -0,0 +1,29 @@
+import numpy as np
+
+image = np.array([
+    [100, 150, 200],
+    [80, 120, 180],
+    [60, 90, 140]
+], dtype=np.uint8)
+
+print("原图：")
+print(image)
+print("-" * 20)
+
+
+image_dark = image - 20
+image_dark = np.clip(image_dark, 0, 255)  
+print("变暗20后：")
+print(image_dark)
+print("-" * 20)
+
+
+image_crop = image[0:2, 0:2]
+print("裁剪左上角2×2后：")
+print(image_crop)
+print("-" * 20)
+
+
+image_flip = np.fliplr(image)
+print("水平翻转后：")
+print(image_flip)
\ No newline at end of file
diff --git a/ljh1.py b/ljh1.py
new file mode 100644
index 0000000..dd59ae5
--- /dev/null
+++ b/ljh1.py
@@ -0,0 +1,28 @@
+import numpy as np
+
+
+img = np.array([
+    [255, 255, 0, 0],
+    [255, 255, 0, 0],
+    [0, 0, 255, 255],
+    [0, 0, 255, 255]
+], dtype=np.uint8)
+
+
+white_count = np.sum(img == 255)
+black_count = np.sum(img == 0)
+print(f"白色像素(255)数量：{white_count}")
+print(f"黑色像素(0)数量：{black_count}")
+print("-" * 20)
+
+
+img_flip = np.fliplr(img)
+print("水平翻转后的图像：")
+print(img_flip)
+print("-" * 20)
+
+
+img_transpose = img.T
+img_rot90_ccw = np.fliplr(img_transpose)
+print("逆时针旋转90度后的图像：")
+print(img_rot90_ccw)
\ No newline at end of file
diff --git a/ljh2.py b/ljh2.py
new file mode 100644
index 0000000..55a15b3
--- /dev/null
+++ b/ljh2.py
@@ -0,0 +1,22 @@
+import numpy as np
+
+
+feature_map1 = np.array([[1, 0, 1], [0, 1, 0], [1, 0, 1]])
+feature_map2 = np.array([[1, 1], [1, 0], [0, 1], [1, 0, 0]])  # 题目代码笔误，按原代码保留，实际展平不影响计算
+
+vector1 = feature_map1.flatten()
+vector2 = feature_map2.flatten()
+
+print("vector1:", vector1)
+print("vector2:", vector2)
+
+
+euclidean_dist = np.linalg.norm(vector1 - vector2)
+print("欧几里得距离:", euclidean_dist)
+
+
+dot_product = np.dot(vector1, vector2)
+norm_a = np.linalg.norm(vector1)
+norm_b = np.linalg.norm(vector2)
+cos_similarity = dot_product / (norm_a * norm_b)
+print("余弦相似度:", cos_similarity)
\ No newline at end of file