CV：cv2實現檢測幾何形狀并進行識別、輸出周長、面積、顏色、形狀類型

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實現代碼

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實現代碼

# -*- coding: utf-8 -*-#OpenCV實現檢測幾何形狀并進行識別、輸出周長、面積、顏色、形狀類型——Jason niu import cv2 as cv import numpy as npclass ShapeAnalysis: #定義形狀分析的類def __init__(self):self.shapes = {'triangle': 0, 'rectangle': 0, 'polygons': 0, 'circles': 0}def analysis(self, frame):h, w, ch = frame.shaperesult = np.zeros((h, w, ch), dtype=np.uint8)# 二值化圖像print("start to detect lines...\n")gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)ret, binary = cv.threshold(gray, 0, 255, cv.THRESH_BINARY_INV | cv.THRESH_OTSU)cv.imshow("input image", frame)out_binary, contours, hierarchy = cv.findContours(binary, cv.RETR_EXTERNAL, cv.CHAIN_APPROX_SIMPLE)for cnt in range(len(contours)):# 提取與繪制輪廓cv.drawContours(result, contours, cnt, (0, 255, 0), 2)# 輪廓逼近epsilon = 0.01 * cv.arcLength(contours[cnt], True)approx = cv.approxPolyDP(contours[cnt], epsilon, True)# 分析幾何形狀corners = len(approx)shape_type = ""if corners == 3:count = self.shapes['triangle']count = count+1self.shapes['triangle'] = countshape_type = "三角形"if corners == 4:count = self.shapes['rectangle']count = count + 1self.shapes['rectangle'] = countshape_type = "矩形"if corners >= 10:count = self.shapes['circles']count = count + 1self.shapes['circles'] = countshape_type = "圓形"if 4 < corners < 10:count = self.shapes['polygons']count = count + 1self.shapes['polygons'] = countshape_type = "多邊形"# 求解中心位置mm = cv.moments(contours[cnt])cx = int(mm['m10'] / mm['m00'])cy = int(mm['m01'] / mm['m00'])cv.circle(result, (cx, cy), 3, (0, 0, 255), -1)# 顏色分析和提取color = frame[cy][cx]color_str = "(" + str(color[0]) + ", " + str(color[1]) + ", " + str(color[2]) + ")"# 計算面積與周長p = cv.arcLength(contours[cnt], True)area = cv.contourArea(contours[cnt])print("周長: %.3f, 面積: %.3f 顏色: %s 形狀: %s "% (p, area, color_str, shape_type))cv.imshow("Analysis Result", self.draw_text_info(result))return self.shapes if __name__ == "__main__":src = cv.imread("F:/File_Python/Resources/004.png")ld = ShapeAnalysis()ld.analysis(src)cv.waitKey(0)cv.destroyAllWindows()

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