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--- wiki2:opencv [2015/10/17 11:19]
alfred [Use in Python]
+++ wiki2:opencv [2020/05/09 09:25] (actual)
@@ Línea 50: / Línea 50: @@
     return 0;
  }
+</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:
@@ Línea 59: / Línea 84: @@
 </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