Help For OpenCV Smoothing Contours

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Hi, I need the code about detecting shapes and colours of the shapes in the photo and the colors of the shapes. Now I coded in the PyCharm, but I can't get correct result from the my program because image's contours are not flat completely. So it says "Ellipse" for about the some triangles. I tried Median Blur, bilateral blur image smoothing methods. And I can't get correct result. Anyone can help to me? Thanks..

import cv2
import numpy as np

font1= cv2.FONT_HERSHEY_PLAIN

img_filter = cv2.imread("C:\\Users\\yusuf\\PycharmProjects\\OpenCV\\venv\\soru1.jpg")
img=cv2.medianBlur(img_filter,1)
cv2.imshow("img_filter",img_filter)






gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

_,threshold = cv2.threshold(gray,240,255,cv2.THRESH_BINARY)

contours,_ = cv2.findContours(threshold,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

for cnt in contours:

epsilon = 0.001*cv2.arcLength(cnt,True)
approx = cv2.approxPolyDP(cnt,epsilon,True)
x = approx.ravel()[0]
y = approx.ravel()[1]
 
centres = []
for i in range(len(contours)):
    moments = cv2.moments(contours[i])
 
centres.append((int(moments['m10']/moments['m00']), int(moments['m01']/moments['m00'])))
cv2.circle(img, centres[-1], 3, -1)
 
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
_, threshold = cv2.threshold(gray, 240, 255, cv2.THRESH_BINARY)
 
contours, _ = cv2.findContours(threshold, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
ucgen_sayaci=0
dortgen_sayaci=0
daire_sayaci=0
 
for cnt in contours:
    approx = cv2.approxPolyDP(cnt, 0.01*cv2.arcLength(cnt, True), True)
    cv2.drawContours(img, [approx], 0, (0), 5)
    x = approx.ravel()[0]
    y = approx.ravel()[1]
    if len(approx) == 3:
        ucgen_sayaci = ucgen_sayaci + 1
        cv2.putText(img, "Triangle", (x, y), font1, 1, (0))
    elif len(approx) == 4:
        dortgen_sayaci = dortgen_sayaci + 1
        cv2.putText(img, "Rectangle", (x, y), font1, 1, (0))
    else:
        daire_sayaci = daire_sayaci + 1
        cv2.putText(img, "Circle", (x, y), font1, 1, (0))
 
print("Ucgen Sayisi:",ucgen_sayaci)
print("Dortgen Sayisi:",dortgen_sayaci)
print("Daire Sayisi:",daire_sayaci)
cv2.imwrite('output.png',img)
 
cv2.imshow("IMG",img)
cv2.imshow("IMG1",img_filter)
 
cv2.waitKey(0)
cv2.destroyAllWindows()