How to draw a rectangle around a region of interest in python

Question

I m having trouble with import cv in my python code   My issue is I need to draw a rectangle around regions of interest in an image  How can this be done in python  I m doing object detection and would like to draw a rectangle around the objects I believe I ve found in the image

User · Answer

As the other answers said  the function you need is cv2 rectangle    but keep in mind that the coordinates for the bounding box vertices need to be integers if they are in a tuple  and they need to be in the order of  left  top  and  right  bottom   Or  equivalently   xmin  ymin  and  xmax  ymax

User · Answer

please don t try with the old cv module  use cv2   import cv2  cv2 rectangle img   x1  y1    x2  y2    255 0 0   2    x1 y1 ------                                        --------x2 y2    edit  to append the follow-up questions below   cv2 imwrite  my png  img   cv2 imshow  lalala   img  k   cv2 waitKey 0    0  wait forever

User · Answer

You can use cv2 rectangle     cv2 rectangle img  pt1  pt2  color  thickness  lineType  shift   Draws a simple  thick  or filled up-right rectangle   The function rectangle draws a rectangle outline or a filled rectangle whose two opposite corners are pt1 and pt2   Parameters     img   Image      pt1   Vertex of the rectangle      pt2    Vertex of the rectangle opposite to pt1       color Rectangle color or brightness  grayscale image       thickness  Thickness of lines that make up the rectangle  Negative values      like CV FILLED   mean that the function has to draw a filled rectangle      lineType  Type of the line  See the line description      shift   Number of fractional bits in the point coordinates    I have a PIL Image object and I want to draw rectangle on this image  but PIL s ImageDraw rectangle   method does not have the ability to specify line width  I need to convert Image object to opencv2 s image format and draw rectangle and convert back to Image object  Here is how I do it     im is a PIL Image object im arr   np asarray im    convert rgb array to opencv s bgr format im arr bgr   cv2 cvtColor im arr  cv2 COLOR RGB2BGR    pts1 and pts2 are the upper left and bottom right coordinates of the rectangle cv2 rectangle im arr bgr  pts1  pts2                color  0  255  0   thickness 3  im arr   cv2 cvtColor im arr bgr  cv2 COLOR BGR2RGB    convert back to Image object im   Image fromarray im arr

[python] How to draw a rectangle around a region of interest in python

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