Merge pull request #14107 from adityak2920:aditya

Adding python codes to samples/python

* Python version of samples:
- laplace.py
- drawing.py

* Update drawing.py

* Update drawing.py

* Update drawing.py

* Update laplace.py

* Update laplace.py

* Update drawing.py

* Update drawing.py

* Update laplace.py

* samples

* drawing

* drawing

* drawing.py

samples/python/drawing.py

+#!/usr/bin/env python
+'''
+    This program demonstrates OpenCV drawing and text output functions by drawing different shapes and text strings
+    Usage :
+        python3 drawing.py
+    Press any button to exit
+    '''
+
+# Python 2/3 compatibility
+from __future__ import print_function
+
+import numpy as np
+import cv2 as cv
+
+# Drawing Lines
+def lines():
+    for i in range(NUMBER*2):
+        pt1, pt2 = [], []
+        pt1.append(np.random.randint(x1, x2))
+        pt1.append(np.random.randint(y1, y2))
+        pt2.append(np.random.randint(x1, x2))
+        pt2.append(np.random.randint(y1, y2))
+        color = "%06x" % np.random.randint(0, 0xFFFFFF)
+        color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
+        arrowed =  np.random.randint(0, 6)
+        if (arrowed<3):
+            cv.line(image, tuple(pt1), tuple(pt2), color, np.random.randint(1, 10), lineType)
+        else:
+            cv.arrowedLine(image, tuple(pt1), tuple(pt2), color, np.random.randint(1, 10), lineType)
+        cv.imshow(wndname, image)
+        if cv.waitKey(DELAY)>=0:
+            return
+
+# Drawing Rectangle
+def rectangle():
+    for i in range(NUMBER*2):
+        pt1, pt2 = [], []
+        pt1.append(np.random.randint(x1, x2))
+        pt1.append(np.random.randint(y1, y2))
+        pt2.append(np.random.randint(x1, x2))
+        pt2.append(np.random.randint(y1, y2))
+        color = "%06x" % np.random.randint(0, 0xFFFFFF)
+        color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
+        thickness = np.random.randint(-3, 10)
+        marker = np.random.randint(0, 10)
+        marker_size = np.random.randint(30, 80)
+
+        if (marker > 5):
+            cv.rectangle(image, tuple(pt1), tuple(pt2), color, max(thickness, -1), lineType)
+        else:
+            cv.drawMarker(image, tuple(pt1), color, marker, marker_size)
+        cv.imshow(wndname, image)
+        if cv.waitKey(DELAY)>=0:
+            return
+
+# Drawing ellipse
+def ellipse():
+    for i in range(NUMBER*2):
+        center = []
+        center.append(np.random.randint(x1, x2))
+        center.append(np.random.randint(x1, x2))
+        axes = []
+        axes.append(np.random.randint(0, 200))
+        axes.append(np.random.randint(0, 200))
+        angle = np.random.randint(0, 180)
+        color = "%06x" % np.random.randint(0, 0xFFFFFF)
+        color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
+        thickness = np.random.randint(-1, 9)
+        cv.ellipse(image, tuple(center), tuple(axes), angle, angle-100, angle + 200, color, thickness, lineType)
+        cv.imshow(wndname, image)
+        if cv.waitKey(DELAY)>=0:
+            return
+
+# Drawing Polygonal Curves
+def polygonal():
+    for i in range(NUMBER):
+        pt = [(0, 0)]*6
+        pt = np.resize(pt, (2, 3, 2))
+        pt[0][0][0] = np.random.randint(x1, x2)
+        pt[0][0][1] = np.random.randint(y1, y2)
+        pt[0][1][0] = np.random.randint(x1, x2)
+        pt[0][1][1] = np.random.randint(y1, y2)
+        pt[0][2][0] = np.random.randint(x1, x2)
+        pt[0][2][1] = np.random.randint(y1, y2)
+        pt[1][0][0] = np.random.randint(x1, x2)
+        pt[1][0][1] = np.random.randint(y1, y2)
+        pt[1][1][0] = np.random.randint(x1, x2)
+        pt[1][1][1] = np.random.randint(y1, y2)
+        pt[1][2][0] = np.random.randint(x1, x2)
+        pt[1][2][1] = np.random.randint(y1, y2)
+        color = "%06x" % np.random.randint(0, 0xFFFFFF)
+        color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
+        alist = []
+        for k in pt[0]:
+            alist.append(k)
+        for k in pt[1]:
+            alist.append(k)
+        ppt = np.array(alist)
+        cv.polylines(image, [ppt], True, color, thickness = np.random.randint(1, 10), lineType = lineType)
+        cv.imshow(wndname, image)
+        if cv.waitKey(DELAY) >= 0:
+            return
+
+# fills an area bounded by several polygonal contours
+def fill():
+    for i in range(NUMBER):
+        pt = [(0, 0)]*6
+        pt = np.resize(pt, (2, 3, 2))
+        pt[0][0][0] = np.random.randint(x1, x2)
+        pt[0][0][1] = np.random.randint(y1, y2)
+        pt[0][1][0] = np.random.randint(x1, x2)
+        pt[0][1][1] = np.random.randint(y1, y2)
+        pt[0][2][0] = np.random.randint(x1, x2)
+        pt[0][2][1] = np.random.randint(y1, y2)
+        pt[1][0][0] = np.random.randint(x1, x2)
+        pt[1][0][1] = np.random.randint(y1, y2)
+        pt[1][1][0] = np.random.randint(x1, x2)
+        pt[1][1][1] = np.random.randint(y1, y2)
+        pt[1][2][0] = np.random.randint(x1, x2)
+        pt[1][2][1] = np.random.randint(y1, y2)
+        color = "%06x" % np.random.randint(0, 0xFFFFFF)
+        color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
+        alist = []
+        for k in pt[0]:
+            alist.append(k)
+        for k in pt[1]:
+            alist.append(k)
+        ppt = np.array(alist)
+        cv.fillPoly(image, [ppt], color, lineType)
+        cv.imshow(wndname, image)
+        if cv.waitKey(DELAY) >= 0:
+            return
+
+# Drawing Circles
+def circles():
+    for i in range(NUMBER):
+        center = []
+        center.append(np.random.randint(x1, x2))
+        center.append(np.random.randint(x1, x2))
+        color = "%06x" % np.random.randint(0, 0xFFFFFF)
+        color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
+        cv.circle(image, tuple(center), np.random.randint(0, 300), color, np.random.randint(-1, 9), lineType)
+        cv.imshow(wndname, image)
+        if cv.waitKey(DELAY) >= 0:
+            return
+
+# Draws a text string
+def string():
+    for i in range(NUMBER):
+        org = []
+        org.append(np.random.randint(x1, x2))
+        org.append(np.random.randint(x1, x2))
+        color = "%06x" % np.random.randint(0, 0xFFFFFF)
+        color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
+        cv.putText(image, "Testing text rendering", tuple(org), np.random.randint(0, 8), np.random.randint(0, 100)*0.05+0.1, color, np.random.randint(1, 10), lineType)
+        cv.imshow(wndname, image)
+        if cv.waitKey(DELAY) >= 0:
+            return
+
+
+def string1():
+    textsize = cv.getTextSize("OpenCV forever!", cv.FONT_HERSHEY_COMPLEX, 3, 5)
+    org = (int((width - textsize[0][0])/2), int((height - textsize[0][1])/2))
+    for i in range(0, 255, 2):
+        image2 = np.array(image) - i
+        cv.putText(image2, "OpenCV forever!", org, cv.FONT_HERSHEY_COMPLEX, 3, (i, i, 255), 5, lineType)
+        cv.imshow(wndname, image2)
+        if cv.waitKey(DELAY) >= 0:
+            return
+
+if __name__ == '__main__':
+    print(__doc__)
+    wndname = "Drawing Demo"
+    NUMBER = 100
+    DELAY = 5
+    width, height = 1000, 700
+    lineType = cv.LINE_AA  # change it to LINE_8 to see non-antialiased graphics
+    x1, x2, y1, y2 = -width/2, width*3/2, -height/2, height*3/2
+    image = np.zeros((height, width, 3), dtype = np.uint8)
+    cv.imshow(wndname, image)
+    cv.waitKey(DELAY)
+    lines()
+    rectangle()
+    ellipse()
+    polygonal()
+    fill()
+    circles()
+    string()
+    string1()
+    cv.waitKey(0)
+    cv.destroyAllWindows()
\ No newline at end of file

samples/python/laplace.py

+#!/usr/bin/env python
+
+'''
+    This program demonstrates Laplace point/edge detection using
+    OpenCV function Laplacian()
+    It captures from the camera of your choice: 0, 1, ... default 0
+    Usage:
+        python laplace.py <ddepth> <smoothType> <sigma>
+        If no arguments given default arguments will be used.
+
+    Keyboard Shortcuts:
+    Press space bar to exit the program.
+    '''
+
+# Python 2/3 compatibility
+from __future__ import print_function
+
+import numpy as np
+import cv2 as cv
+import sys
+
+def main():
+    # Declare the variables we are going to use
+    ddepth = cv.CV_16S
+    smoothType = "MedianBlur"
+    sigma = 3
+    if len(sys.argv)==4:
+        ddepth = sys.argv[1]
+        smoothType = sys.argv[2]
+        sigma = sys.argv[3]
+    # Taking input from the camera
+    cap=cv.VideoCapture(0)
+    # Create Window and Trackbar
+    cv.namedWindow("Laplace of Image", cv.WINDOW_AUTOSIZE)
+    cv.createTrackbar("Kernel Size Bar", "Laplace of Image", sigma, 15, lambda x:x)
+    # Printing frame width, height and FPS
+    print("=="*40)
+    print("Frame Width: ", cap.get(cv.CAP_PROP_FRAME_WIDTH), "Frame Height: ", cap.get(cv.CAP_PROP_FRAME_HEIGHT), "FPS: ", cap.get(cv.CAP_PROP_FPS))
+    while True:
+        # Reading input from the camera
+        ret, frame = cap.read()
+        if ret == False:
+            print("Can't open camera/video stream")
+            break
+        # Taking input/position from the trackbar
+        sigma = cv.getTrackbarPos("Kernel Size Bar", "Laplace of Image")
+        # Setting kernel size
+        ksize = (sigma*5)|1
+        # Removing noise by blurring with a filter
+        if smoothType == "GAUSSIAN":
+            smoothed = cv.GaussianBlur(frame, (ksize, ksize), sigma, sigma)
+        if smoothType == "BLUR":
+            smoothed = cv.blur(frame, (ksize, ksize))
+        if smoothType == "MedianBlur":
+            smoothed = cv.medianBlur(frame, ksize)
+
+        # Apply Laplace function
+        laplace = cv.Laplacian(smoothed, ddepth, 5)
+        # Converting back to uint8
+        result = cv.convertScaleAbs(laplace, (sigma+1)*0.25)
+        # Display Output
+        cv.imshow("Laplace of Image", result)
+        k = cv.waitKey(30)
+        if k == 27:
+            return
+if __name__ == "__main__":
+    print(__doc__)
+    main()
+    cv.destroyAllWindows()