python 日本就業

Read basics of the drawing/image processing in python: Drawing flag of Thailand

閱讀python中繪圖/圖像處理的基礎知識： 泰國的繪圖標志

The national flag of Japan is a rectangular white banner bearing a crimson-red disc at its center. This flag is officially called Nisshōki but is more commonly known in Japan as Hinomaru. It embodies the country's sobriquet: Land of the Rising Sun.

日本的國旗是矩形的白色橫幅，其中心帶有深紅色的圓盤。 該旗幟正式被稱為Nisshōki，但在日本更廣為人知。 它體現了該國的縮寫：旭日之國。

Steps:

腳步：

First, we make a matrix of dimensions 300 X 600 X 3. Where the number of pixels of rows is 300, the number of pixels of columns is 600 and 3 represent the number of dimensions of the color coding in BGR format.

首先，我們制作一個尺寸為300 X 600 X 3的矩陣。如果行的像素數為300，則列的像素數為600，而3表示BGR格式的顏色編碼的維數。

• Paint the complete image with white color. BGR code for White is (255,255,255).

  用白色繪制整個圖像。 白色的BGR代碼是(255,255,255)。

• Apply loop on rows and columns and implement the equation of the circle such that we get a circle in the center of the flag and color it crimson glory using RGB format.

  在行和列上應用循環并實現圓的方程，這樣我們就可以在標志的中心得到一個圓，并使用RGB格式為其著色為深紅色。

Equation of circle:

圓方程：

    ((x-h)^2 - (y-k)^2)=r^2

Where (h, k) are the centres, (x, y) are co-ordinates of x-axis and y-axis and r is the radius of the circle.

其中(h，k)是中心， (x，y)是x軸和y軸的坐標， r是圓的半徑。

bgrcode for crimson glory color is (45, 0, 188).

深紅色的榮耀顏色的bgrcode是( 45，0，188 )。

Python代碼繪制日本國旗 (Python code to draw flag of Japan)

# import numpy library as np
import numpy as np
# import open-cv library
import cv2
# import sqrt function from the math module
from math import sqrt
# here image is of class 'uint8', the range of values  
# that each colour component can have is [0 - 255]
# create a zero matrix of order 300x600 of 3-dimensions
flag = np.zeros((300, 600, 3),np.uint8)
# take coordinate of the circle
center_x, center_y = 150, 300
# take radius of the circle
radius = 50
# fill whole pixels of dimensions
# with White color
flag[:, :, :] = 255;
# Draw a circle with crimson glory color
# loop for rows i.e. for x-axis
for i in range(101,201) :
# loop for columns i.e. for y-axis 
for j in range(251, 351) :
#applying the equation of circle to make the circle in the center. 
distance = sqrt((center_x - i)**2 + (center_y - j)**2)
if distance <= radius :
# fill the circle with crimson glory 
# color using RGB color representation. 
flag[i, j, 0] = 45
flag[i, j, 1] = 0
flag[i, j, 2] = 188
# Show the image formed
cv2.imshow("Japan Flag",flag);

Output

輸出量

翻譯自: https://www.includehelp.com/python/drawing-flag-of-japan-image-processing-in-python.aspx

python 日本就業