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從深度圖像中尋找輪廓

[英]Finding contour from depth image

我是圖像處理的新手。 我有一個已轉換為灰度的深度圖像,如下所示:

從深度到灰度

通過

depth_image_raw = np.asanyarray(depth_frame.get_data())
to_grayscale = cv2.convertScaleAbs(depth_image_raw, alpha=0.30)
ret, Thresh = cv2.threshold(to_grayscale, 60, 155, 0)
contours, hierarchy = cv2.findContours(Thresh, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
cv2.drawContours(to_grayscale, contours, 0, (0, 0, 255), 2)

這沒有用。 當我執行print(countours)時,我可以看到坐標列表,但它不是由cv2.drawCountours繪制的。

我哪里錯了?

我試圖做這樣的事情: 1檢測深度 map 上的近似物體

嘗試從Detect about objects on depth map開始重新創建您的問題;

輸入圖像:

input_image_from_Detect 近似深度圖上的對象-RESIZED

這是我的代碼:

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Wed Jun  9 08:20:40 2021

@author: Pietro

https://stackoverflow.com/questions/67898354/finding-contour-from-depth-image


codice non utilizzabile manca import e immagine originale 
"""



import cv2

imagez1 = cv2.imread('1tCjh_resized.png') #from https://stackoverflow.com/questions/38094594/detect-approximately-objects-on-depth-map

print(imagez1.dtype,'   ',imagez1.shape)  

cv2.imshow('pippo',imagez1)
cv2.waitKey(0)
cv2.destroyAllWindows()

imagez = cv2.imread('1tCjh_resized.png', cv2.IMREAD_GRAYSCALE) #from https://stackoverflow.com/questions/38094594/detect-approximately-objects-on-depth-map  

print(imagez.dtype,'   ',imagez.shape)  

cv2.imshow('pippoZ',imagez)
cv2.waitKey(0)
cv2.destroyAllWindows()


ret,th = cv2.threshold(imagez,127,255, 1)


contours, hierarchy = cv2.findContours(th, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

print(contours)
cv2.drawContours(imagez, contours, 0, (0, 0, 255), 2) #black contours
# cv2.drawContours(imagez, contours, 0, (255, 0, 0), 2) #white contours



cv2.imshow('pippoZZ',imagez)
cv2.waitKey(0)
cv2.destroyAllWindows()


我的問題是:當我們談論灰度圖像時,為什么 cv2.drawContours(to_grayscale, contours, 0, (0, 0, 255), 2) 指定計數顏色 (0, 0, 255)?

所以我猜罪魁禍首在這里:

depth_image_raw = np.asanyarray(depth_frame.get_data())
to_grayscale = cv2.convertScaleAbs(depth_image_raw, alpha=0.30)

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