如何按顺序将图像放在另一个图像上？

Question

在下面的示例中，白色背景上依次显示了三张图像。如何在 python 中使用 CV2 或 PIL 或任何工作代码实现此目的。

谢谢。

图片必须根据宽高比对齐。

输入 = 3 张带 BG 的图像，

输出=单张图片如上图

更新 !!!!

每次循环只有一张图片贴在BG上。

from PIL import Image
import cv2
import numpy as np

d=0
folder = 'save'
image_paths = []
for path, subdirs, files in os.walk(folder):
    for filename in files:
        f = os.path.join(path, filename)
        if f.endswith(".jpg"):
            image_paths.append(f)
        if f.endswith(".png"):
            image_paths.append(f)
        if f.endswith(".JPG"):
            image_paths.append(f)
        if f.endswith(".PNG"):
            image_paths.append(f)  
        if f.endswith(".jpeg"):
            image_paths.append(f)    
        if f.endswith(".JPEG"):
            image_paths.append(f)
          

for image in image_paths:
    image = cv2.imread(image)
    r = 720.0 / image.shape[1]
    dim = (720, int(image.shape[0] * r))

    resized = cv2.resize(image, dim)
    #resized = resized[:,:,0]
    h, w, z = resized.shape

    back = cv2.imread('template.jpg')

    yoff = round((1080-h)/4)
    xoff = round((1920-w)/6)

    d+=1
    result = back.copy()
    result[yoff:yoff+h, xoff:xoff+w] = resized
    #result = np.stack((result)*3)
    cv2.imwrite('saves/resized_centered_%d.jpg'%d,  result)

所以输入中的多张图片被粘贴到背景中，但问题是，我想将三张图片粘贴到背景中，而不是按顺序粘贴一张图片。

注意：顶部的图片仅代表我的帮助！！！你可以告诉我除此之外的任何可能!!!

这行代码将图像移到左上角并正确放置，但同样我还需要另外两张图像放置在右上角和底部。

yoff = round((1080-h)/4)
xoff = round((1920-w)/6)

Answer 1

我假设有这样的模板：

“最终图像”的尺寸为 (1920, 1080)（参见您对 xoff 和 yoff 的计算）。既然你写了，你想保持每个“单张图片”的纵横比，你需要检查这两种情况：Resize w.r.t。到单个图像的宽度，如果生成的高度太大，re-resize w.r.t。到单张图片的高度。

剩下的就是跟踪循环内每个最终图像的单张图像数量，并为三种情况中的每一种设置适当的 xoff 和 yoff 值。也许，查看此处的代码比长篇解释更有帮助：

import cv2
import numpy as np
import os

folder = 'path/to/your/images'
image_paths = []
for path, subdirs, files in os.walk(folder):
    for filename in files:
        f = os.path.join(path, filename)
        if f.endswith((".jpg", ".png", ".JPG", ".PNG", ".jpeg", ".JPEG")):
            image_paths.append(f)

d = 0                                               # Final image counter
e = 0                                               # Single image counter
back = np.ones((1080, 1920, 3), np.uint8) * 255     # Background
result = back.copy()                                # Final image
for i, image in enumerate(image_paths):

    # Read image
    image = cv2.imread(image)
    h, w = image.shape[:2]

    # First two single images: Enforce subimage with h_max = 480 and w_max = 900
    if e <= 1:
        r = 900.0 / w
        dim = (900, int(h * r))
        if dim[1] > 480:
            r = 480.0 / h
            dim = (int(w * r), 480)
        resized = cv2.resize(image, dim)
        hr, wr = resized.shape[:2]
        x_off = 40
        if e == 0:
            y_off = 40
        else:
            y_off = 560

    # Third single image: Enforce subimage with h_max = 1000 and w_max = 900
    else:
        r = 900.0 / w
        dim = (900, int(h * r))
        if dim[1] > 1000:
            r = 1000.0 / h
            dim = (int(w * r), 1000)
        resized = cv2.resize(image, dim)
        hr, wr = resized.shape[:2]
        x_off, y_off = 980, 40

    # Add single image to final image
    result[y_off:y_off + hr, x_off:x_off + wr] = resized

    # Increment single image counter
    e += 1

    # After three single images: Write final image; start new final image
    if (e == 3) or (i == (len(image_paths) - 1)):
        cv2.imwrite('resized_centered_%d.jpg' % d, result)
        result = back.copy()
        d += 1
        e = 0

对于我的 Whosebug 存档中的一些随机图像，我得到以下输出：

如果您想在单张图片周围或图片之间设置不同大小的框或边距，只需调整代码中的相应值即可。

----------------------------------------
System information
----------------------------------------
Platform:      Windows-10-10.0.16299-SP0
Python:        3.9.1
PyCharm:       2021.1.1
NumPy:         1.20.2
OpenCV:        4.5.1
----------------------------------------

如何按顺序将图像放在另一个图像上？

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