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--- wiki2:opencv [2015/10/17 10:53]
alfred [Use in Python]
+++ wiki2:opencv [2020/05/09 09:25] (actual)
@@ Línea 51: / Línea 51: @@
  }
 </code>
+===== Basic with images =====
+==== Create black image ====
+<code python>
+import numpy as np
+blank_image = np.zeros((height,width,3), np.uint8)
+</code>
+==== Obtain ROI ====
+<code python>
+>>> ball = img[280:340, 330:390]
+>>> img[273:333, 100:160] = ball
+</code>
+==== Write an image inside another ====
+<code python>
+black_image[:height, :width] = frame[:,:]
+</code>
+==== Obtain the average color ====
+<code python>
+color = np.mean(m_roi, axis=0)
+</code>
+==== Draw figures ====
+<code python>
+cv2.rectangle(black_image, (pos_x, pos_y), (pos_x + size_x, pos_y + size_y), (255, 255, 255))
+</code>
+===== Video Capture =====
+You can capture images and obtain the properties:
+<code python>
+cap = cv2.VideoCapture(0)
+width, height = cap.get(cv2.cv.CV_CAP_PROP_FRAME_WIDTH), cap.get(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT)
+</code>
+VideoCapture properties in C++ are: CV_CAP_PROP_FRAME_WIDTH...
+===== Others =====
+==== Get a sample of colors ====
+<code python>
+idx_x = np.random.randint(colorset.shape[0], size=_size)
+idx_y = np.random.randint(colorset.shape[1], size=_size)
+sample = colorset[idx_y, idx_x, :]
+</code>
+==== Change the shape of a num.array ====
+Use ''reshape''.

Programming