OpenCV - Display ONLY the keypoints NOT the image using SIFT -


i trying only draw keypoints (without image) using example code:

import cv2 import numpy np  img = cv2.imread('test.png') gray= cv2.cvtcolor(img,cv2.color_bgr2gray)  sift = cv2.sift() kp = sift.detect(gray,none)  img=cv2.drawkeypoints(gray,kp)  cv2.imwrite('sift_keypoints.jpg',img)

i tried cv2.drawkeypoints(none,kp)and cv2.drawkeypoints(kp) no avail.

any ideas how achieved ?

thanks.

you can only keypoints drawing them on solid black image having same shape of original image.

this image used:

enter image description here

i obtained keypoints:

enter image description here

then created image of solid color(black) having same size of original image , draw these keypoints on them.

enter image description here

voila keypoints

code:

#---creating image of solid color same size image--- mask = np.zeros((img.shape[0], img.shape[1], 3), np.uint8) mask[:] = (0, 0, 0)   #---drawing keypoints on mask image--- fmask = cv2.drawkeypoints(mask,kp,none,color=(0,255,0), flags=0) cv2.imshow('fmask.jpg', fmask)

Comments

Post a Comment

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

Image
i have page in each contest shown in row. each row contains contest id , link other model names have foreign key contest. news model: class news(models.model): title = models.charfield(max_length=50, null=true) description = models.textfield() time = models.timefield( default= datetime.datetime.now().time()) contest = models.foreignkey(contest) i want use admin adding , changing these models. want when user clicks on 'news' has foreign key contest id=1, shows list of news value foreign key. use {% instance in instances %} <tr class="{% cycle 'row1' 'row2' %}"> <td>{{ instance.title }}</td> <td>{{ instance.starttime }}</td> <td>{{ instance.timespan }}</td> <td>{{ instance.date }}</td> <td><a href="/adm...
Read more

android - Keyboard hides my half of edit-text and button below it even in scroll view -

i having trouble keyboard covers edit-text , half of button in scroll view. here's layout , please tell me how should resolve problem. many questions on topic none of them s working me. <?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:background="@drawable/bg" android:layout_height="match_parent"> <scrollview android:layout_width="match_parent" android:fillviewport="true" android:layout_height="match_parent"> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <linearlayout android:layout_width="match_parent" android:layout_height="w...
Read more

css - Make div keyboard-scrollable in jQuery Mobile? -

from can tell, although jquery-mobile-powered pages can contain divs overflow set scroll or auto, , these divs can scrolled one-screen bar or mouse wheel, cannot scrolled using arrow keys, page-up/page-down, or home/end. instead, official "page" div (with data-role="page") absorbs input. perhaps other divs can't acquire focus, i'm not sure. is there way around this? edit: jsfiddle of simple example: https://jsfiddle.net/qogz0shx/ <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquerymobile/1.4.5/jquery.mobile.min.js"> </script> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"/> <style> #outer { overflow:scroll; height: 50vh; width: 50vw; } #inner { height: 500vh; width: 500vw; } ...
Read more