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【python】画像を任意の横軸で分割

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import numpy as np
import cv2

def onMouse(event, x, y, flag, wname):
    global cnt
    global img
    
    if event == cv2.EVENT_MOUSEMOVE:  # when mouse move, draw line
        img2 = np.copy(img)
        h, w = img2.shape[0], img2.shape[1]
        # cv2.line(img2, (x, 0), (x, h - 1), (255, 0, 0), thickness=2) # vertical line
        cv2.line(img2, (0, y), (w - 1, y), (255, 0, 0), thickness=2) # horizontal line
        cv2.imshow(wname, img2)

    if event == cv2.EVENT_LBUTTONDOWN:  # when left click, get (x, y) and split image
        print(x, y)

        # split image
        cv2.imwrite('split_pic/split_' + '{:03d}'.format(cnt) + '.jpg', img[:y, :, :])
        cnt += 1

        # update image
        img = np.copy(img[y:, :, :])
        cv2.imshow(wname, img)

if __name__ == '__main__':
    # global parameter
    cnt = 0
    img = cv2.imread('sample.png')

    wname = 'MouseEvent'
    cv2.namedWindow(wname)
    cv2.setMouseCallback(wname, onMouse, wname)
    cv2.imshow(wname, img)
    cv2.waitKey()
    cv2.destroyAllWindows()

参考
【python-openCV】画像を縦、横方向に指定数で等分割する方法! - ヒガサラblog
Pythonで画像の座標を取得する方法を現役エンジニアが解説【初心者向け】 | TechAcademyマガジン
python — Python OpenCV CV2のimshow()ウィンドウを更新する方法
python — opencvのwaitKey()関数に他のキーを使用する
OpenCVを使ってマウスイベント(手動)でテニスコート領域を選択できるようにする - Qiita
Python, OpenCVで図形描画(線、長方形、円、矢印、文字など) | note.nkmk.me
Python, formatで書式変換(0埋め、指数表記、16進数など) | note.nkmk.me

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