Menemukan kontur

Pemrosesan Citra dengan Python

Rebeca Gonzalez

Data Engineer

Menemukan kontur

Mengukur ukuran
Mengklasifikasikan bentuk
Menentukan jumlah objek

Total titik pada kepingan domino: 29.

Citra biner

Kita dapat memperoleh citra biner dengan menerapkan thresholding atau menggunakan deteksi tepi

Temukan kontur dengan scikit-image

Menyiapkan citra

Ubah citra ke skala abu-abu 2D.

# Make the image grayscale
image = color.rgb2gray(image)

Temukan kontur dengan scikit-image

Menyiapkan citra

Binerkan citra

# Obtain the thresh value
thresh = threshold_otsu(image)

# Apply thresholding
thresholded_image = image > thresh

Temukan kontur dengan scikit-image

Lalu gunakan find_contours().

# Import the measure module
from skimage import measure

# Find contours at a constant value of 0.8
contours = measure.find_contours(thresholded_image, 0.8)

Nilai level konstan

Langkah menemukan kontur

from skimage import measure
from skimage.filters import threshold_otsu

# Make the image grayscale
image = color.rgb2gray(image)

# Obtain the optimal thresh value of the image
thresh = threshold_otsu(image)

# Apply thresholding and obtain binary image
thresholded_image = image > thresh


# Find contours at a constant value of 0.8
contours = measure.find_contours(thresholded_image, 0.8)

Langkah menemukan kontur

Hasilnya

Bentuk sebuah kontur

Kontur: daftar ndarray berdimensi (n, 2).

for contour in contours:
    print(contour.shape)

(433, 2)
(433, 2)
(401, 2)
(401, 2) 
(123, 2)
(123, 2) 
(59, 2)
(59, 2)
(59, 2)
(57, 2)
(57, 2)
(59, 2)
(59, 2)

Bentuk sebuah kontur

for contour in contours:
    print(contour.shape)

(433, 2)
(433, 2) --> Batas luar
(401, 2)
(401, 2)
(123, 2)
(123, 2)
(59, 2)
(59, 2)
(59, 2)
(57, 2)
(57, 2)
(59, 2)
(59, 2)

Bentuk sebuah kontur

for contour in contours:
    print(contour.shape)

(433, 2)
(433, 2) --> Batas luar
(401, 2)
(401, 2) --> Batas dalam
(123, 2)
(123, 2) 
(59, 2)
(59, 2)
(59, 2)
(57, 2)
(57, 2)
(59, 2)
(59, 2)

Bentuk sebuah kontur

for contour in contours:
    print(contour.shape)

(433, 2)
(433, 2) --> Batas luar
(401, 2)
(401, 2) --> Batas dalam
(123, 2)
(123, 2) --> Garis pembatas kepingan
(59, 2)
(59, 2)
(59, 2)
(57, 2)
(57, 2)
(59, 2)
(59, 2)

Bentuk sebuah kontur

for contour in contours:
    print(contour.shape)

(433, 2)
(433, 2) --> Batas luar
(401, 2)
(401, 2) --> Batas dalam
(123, 2)
(123, 2) --> Garis pembatas kepingan
(59, 2)
(59, 2)
(59, 2)
(57, 2)
(57, 2)
(59, 2)
(59, 2) --> Titik

Jumlah titik: 7.

Ayo berlatih!

Pemrosesan Citra dengan Python