openCV测试用例

opencv的用例中给出了一个文件drawing.py

#! /usr/bin/env pythonfrom random import Randomimport colorsysprint "OpenCV Python version of drawing"import cv2.cv as cvdef random_color(random):    """    Return a random color    """    icolor = random.randint(0, 0xFFFFFF)    return cv.Scalar(icolor & 0xff, (icolor >> 8) & 0xff, (icolor >> 16) & 0xff)if __name__ == '__main__':    # some "constants"    width = 1000    height = 700    window_name = "Drawing Demo"    number = 100    delay = 5    line_type = cv.CV_AA  # change it to 8 to see non-antialiased graphics    # create the source image    image = cv.CreateImage( (width, height), 8, 3)    # create window and display the original picture in it    cv.NamedWindow(window_name, 1)    cv.SetZero(image)    cv.ShowImage(window_name, image)    # create the random number    random = Random()    # draw some lines    for i in range(number):        pt1 =  (random.randrange(-width, 2 * width),                          random.randrange(-height, 2 * height))        pt2 =  (random.randrange(-width, 2 * width),                          random.randrange(-height, 2 * height))        cv.Line(image, pt1, pt2,                   random_color(random),                   random.randrange(0, 10),                   line_type, 0)        cv.ShowImage(window_name, image)        cv.WaitKey(delay)    # draw some rectangles    for i in range(number):        pt1 =  (random.randrange(-width, 2 * width),                          random.randrange(-height, 2 * height))        pt2 =  (random.randrange(-width, 2 * width),                          random.randrange(-height, 2 * height))        cv.Rectangle(image, pt1, pt2,                        random_color(random),                        random.randrange(-1, 9),                        line_type, 0)        cv.ShowImage(window_name, image)        cv.WaitKey(delay)    # draw some ellipes    for i in range(number):        pt1 =  (random.randrange(-width, 2 * width),                          random.randrange(-height, 2 * height))        sz =  (random.randrange(0, 200),                        random.randrange(0, 200))        angle = random.randrange(0, 1000) * 0.180        cv.Ellipse(image, pt1, sz, angle, angle - 100, angle + 200,                        random_color(random),                        random.randrange(-1, 9),                        line_type, 0)        cv.ShowImage(window_name, image)        cv.WaitKey(delay)    # init the list of polylines    nb_polylines = 2    polylines_size = 3    pt = [0,] * nb_polylines    for a in range(nb_polylines):        pt [a] = [0,] * polylines_size    # draw some polylines    for i in range(number):        for a in range(nb_polylines):            for b in range(polylines_size):                pt [a][b] =  (random.randrange(-width, 2 * width),                                     random.randrange(-height, 2 * height))        cv.PolyLine(image, pt, 1,                       random_color(random),                       random.randrange(1, 9),                       line_type, 0)        cv.ShowImage(window_name, image)        cv.WaitKey(delay)    # draw some filled polylines    for i in range(number):        for a in range(nb_polylines):            for b in range(polylines_size):                pt [a][b] =  (random.randrange(-width, 2 * width),                                     random.randrange(-height, 2 * height))        cv.FillPoly(image, pt,                       random_color(random),                       line_type, 0)        cv.ShowImage(window_name, image)        cv.WaitKey(delay)    # draw some circles    for i in range(number):        pt1 =  (random.randrange(-width, 2 * width),                          random.randrange(-height, 2 * height))        cv.Circle(image, pt1, random.randrange(0, 300),                     random_color(random),                     random.randrange(-1, 9),                     line_type, 0)        cv.ShowImage(window_name, image)        cv.WaitKey(delay)    # draw some text    for i in range(number):        pt1 =  (random.randrange(-width, 2 * width),                          random.randrange(-height, 2 * height))        font = cv.InitFont(random.randrange(0, 8),                              random.randrange(0, 100) * 0.05 + 0.01,                              random.randrange(0, 100) * 0.05 + 0.01,                              random.randrange(0, 5) * 0.1,                              random.randrange(0, 10),                              line_type)        cv.PutText(image, "Testing text rendering!",                      pt1, font,                      random_color(random))        cv.ShowImage(window_name, image)        cv.WaitKey(delay)    # prepare a text, and get it's properties    font = cv.InitFont(cv.CV_FONT_HERSHEY_COMPLEX,                          3, 3, 0.0, 5, line_type)    text_size, ymin = cv.GetTextSize("OpenCV forever!", font)    pt1 = ((width - text_size[0]) / 2, (height + text_size[1]) / 2)    image2 = cv.CloneImage(image)    # now, draw some OpenCV pub ;-)    for i in range(0, 512, 2):        cv.SubS(image2, cv.ScalarAll(i), image)        (r, g, b) = colorsys.hsv_to_rgb((i % 100) / 100., 1, 1)        cv.PutText(image, "OpenCV forever!",                      pt1, font, cv.RGB(255 * r, 255 * g, 255 * b))        cv.ShowImage(window_name, image)        cv.WaitKey(delay)    # wait some key to end    cv.WaitKey(0)    cv.DestroyAllWindows()