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python - 如何识别平面图的形状？

问题描述

我正在尝试使用平面图来区分两种不同风格的房屋。我很新cv2，所以我在这里有点挣扎。我可以使用下面的代码使用轮廓识别房屋的外部，即来自另一个 Stack Overflow 响应。

import cv2
import numpy as np


def find_rooms(img, noise_removal_threshold=25, corners_threshold=0.1,
               room_closing_max_length=100, gap_in_wall_threshold=500):
    assert 0 <= corners_threshold <= 1
    # Remove noise left from door removal

    img[img < 128] = 0
    img[img > 128] = 255
    contours, _ = cv2.findContours(~img, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
    mask = np.zeros_like(img)
    for contour in contours:
        area = cv2.contourArea(contour)
        if area > noise_removal_threshold:
            cv2.fillPoly(mask, [contour], 255)

    img = ~mask

    # Detect corners (you can play with the parameters here)
    dst = cv2.cornerHarris(img ,2,3,0.04)
    dst = cv2.dilate(dst,None)
    corners = dst > corners_threshold * dst.max()

    # Draw lines to close the rooms off by adding a line between corners on the same x or y coordinate
    # This gets some false positives.
    # You could try to disallow drawing through other existing lines for example.
    for y,row in enumerate(corners):
        x_same_y = np.argwhere(row)
        for x1, x2 in zip(x_same_y[:-1], x_same_y[1:]):

            if x2[0] - x1[0] < room_closing_max_length:
                color = 0
                cv2.line(img, (x1, y), (x2, y), color, 1)

    for x,col in enumerate(corners.T):
        y_same_x = np.argwhere(col)
        for y1, y2 in zip(y_same_x[:-1], y_same_x[1:]):
            if y2[0] - y1[0] < room_closing_max_length:
                color = 0
                cv2.line(img, (x, y1), (x, y2), color, 1)


    # Mark the outside of the house as black
    contours, _ = cv2.findContours(~img, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
    contour_sizes = [(cv2.contourArea(contour), contour) for contour in contours]
    biggest_contour = max(contour_sizes, key=lambda x: x[0])[1]
    mask = np.zeros_like(mask)
    cv2.fillPoly(mask, [biggest_contour], 255)
    img[mask == 0] = 0


    return biggest_contour, mask



#Read gray image

img = cv2.imread("/content/51626-7-floorplan-2.jpg", cv2.IMREAD_GRAYSCALE)
ext_contour, mask = find_rooms(img.copy())
cv2_imshow(mask)
print('exterior')
epsilon = 0.01*cv2.arcLength(ext_contour,True)
approx = cv2.approxPolyDP(ext_contour,epsilon,True)
final = cv2.drawContours(img, [approx], -1, (0, 255, 0), 2)
cv2_imshow(final)

这些平面图将仅具有两种形状中的一种，即 6 面形状和 4 面形状。下面是两种风格：

6面屋

4面屋

我需要忽略任何凸窗或小型挤压件。

我相信下一步是只有主墙的轮廓，使轮廓平滑，然后计算阵列中的边缘。我不知道如何做到这一点。任何帮助将不胜感激！

标签： pythonopencvimage-processingshapesopencv-contour

解决方案

  • 简单的轮廓查找不太可能为您提供强大的解决方案。但是，您当前的方法可以通过首先计算白色背景的蒙版来改进。使用此蒙版的形状，您可以确定布局。

    lower_color_bounds = cv.Scalar(255, 255, 255) upper_color_bounds = cv.Scalar(220, 220, 220)

    mask = cv2.inRange(frame,lower_color_bounds,upper_color_bounds ) mask_rgb = cv2.cvtColor(mask,cv2.COLOR_GRAY2BGR)

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