* add more image examples

examples/vision/image_basic/binary.py

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+from maix import image
+
+# 1. load image
+src_img = image.load("test.jpg")
+
+# 2. binarize the image
+thresholds = ((0, 100, 20, 80, 10, 80))
+img = src_img.copy()
+img.binary(thresholds)
+img.save("binary.jpg")

examples/vision/image_basic/find_apriltags.py

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+from maix import camera, display, image
+from maix.image import ApriltagFamilies
+
+cam = camera.Camera(160, 120)
+disp = display.Display()
+
+families = ApriltagFamilies.TAG36H11
+
+while 1:
+    img = cam.read()
+
+    apriltags = img.find_apriltags(families=ApriltagFamilies.TAG36H11)
+    for a in apriltags:
+        corners = a.corners()
+        for i in range(4):
+            img.draw_line(corners[i][0], corners[i][1], corners[(i + 1) % 4][0], corners[(i + 1) % 4][1], image.COLOR_GREEN, 2)
+
+    disp.show(img)

examples/vision/image_basic/find_barcodes.py

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+from maix import camera, display, image
+
+cam = camera.Camera(320, 240)
+disp = display.Display()
+
+
+while 1:
+    img = cam.read()
+
+    barcodes = img.find_barcodes()
+    for b in barcodes:
+        rect = b.rect()
+        img.draw_rect(rect[0], rect[1], rect[2], rect[3], image.COLOR_BLUE, 2)
+        img.draw_string(0, 0, "payload: " + b.payload(), image.COLOR_GREEN)
+
+    disp.show(img)

examples/vision/image_basic/find_blobs.py

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+from maix import camera, display, image
+
+cam = camera.Camera(320, 240)
+disp = display.Display()
+
+area_threshold = 1000
+pixels_threshold = 1000
+# thresholds = [[0, 80, 40, 80, 10, 80]]        # red
+thresholds = [[0, 80, -120, -10, 0, 30]]        # green
+# thresholds = [[0, 80, 30, 100, -120, -60]]    # blue
+while 1:
+    img = cam.read()
+
+    blobs = img.find_blobs(thresholds, area_threshold = 1000, pixels_threshold = 1000)
+    for b in blobs:
+        corners = b.corners()
+        for i in range(4):
+            img.draw_line(corners[i][0], corners[i][1], corners[(i + 1) % 4][0], corners[(i + 1) % 4][1], image.COLOR_RED)
+
+    disp.show(img)

examples/vision/image_basic/find_edges.py

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+from maix import camera, display
+from maix.image import EdgeDetector
+
+cam = camera.Camera(320, 240)
+disp = display.Display()
+
+edge_type = EdgeDetector.EDGE_CANNY
+
+while 1:
+    img = cam.read()
+    img.find_edges(edge_type, threshold=[50, 100])
+    disp.show(img)

examples/vision/image_basic/find_lines.py

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+from maix import camera, display, image
+import math
+
+cam = camera.Camera(320, 240)
+disp = display.Display()
+
+threshold = 2000
+
+while 1:
+    img = cam.read()
+
+    lines = img.find_lines(threshold=2000)
+    for a in lines:
+        img.draw_line(a.x1(), a.y1(), a.x2(), a.y2(), image.COLOR_RED, 2)
+        theta = a.theta()
+        rho = a.rho()
+        angle_in_radians = math.radians(theta)
+        x = int(math.cos(angle_in_radians) * rho)
+        y = int(math.sin(angle_in_radians) * rho)
+        img.draw_line(0, 0, x, y, image.COLOR_GREEN, 2)
+        img.draw_string(x, y, "theta: " + str(theta) + "," + "rho: " + str(rho), image.COLOR_GREEN)
+
+    disp.show(img)

examples/vision/image_basic/find_qrcodes.py

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+from maix import camera, display, image
+
+cam = camera.Camera(320, 240)
+disp = display.Display()
+
+while 1:
+    img = cam.read()
+    qrcodes = img.find_qrcodes()
+    for q in qrcodes:
+        corners = q.corners()
+        for i in range(4):
+            img.draw_line(corners[i][0], corners[i][1], corners[(i + 1) % 4][0], corners[(i + 1) % 4][1], image.COLOR_RED)
+        img.draw_string(0, 0, "payload: " + q.payload(), image.COLOR_BLUE)
+
+    disp.show(img)