People Innovation Excellence

Feature Descriptor : SIFT (Scale Invariant Feature Transform) Part 1 : Introduction to SIFT

Features and interesting points are important information that can be extracted from an image to provide a “feature” description of an object in the image. This description can then be used to locate the object in another image which is usually called as image matching. Image matching is a fundamental aspect of many problems in computer vision, including object or scene recognition, solving for 3D structure from multiple images, and motion tracking. In order to achieve a good matching result, there are many considerations when extracting features and record them from an image.

Matching features across different images is a common problem in computer vision. When the images are similar in nature, which means they have same scales and same orientations, simple corner detector can be used to extract features from both images. However, when the images are different both in scales and rotations, simple corner detector cannot solve the problem. Some corner detectors like Harris detector is rotation invariant, which means, we still can find the same corner even if the image is rotated. It is obvious because corners remain corners in rotated image. However, Harris is not scale invariant because a corner may not be a corner if the image is scaled. A corner in a small image within a small window may look flat when it is zoomed in the same window as illustrated on the picture below :

 


Published at :

Periksa Browser Anda

Check Your Browser

Situs ini tidak lagi mendukung penggunaan browser dengan teknologi tertinggal.

Apabila Anda melihat pesan ini, berarti Anda masih menggunakan browser Internet Explorer seri 8 / 7 / 6 / ...

Sebagai informasi, browser yang anda gunakan ini tidaklah aman dan tidak dapat menampilkan teknologi CSS terakhir yang dapat membuat sebuah situs tampil lebih baik. Bahkan Microsoft sebagai pembuatnya, telah merekomendasikan agar menggunakan browser yang lebih modern.

Untuk tampilan yang lebih baik, gunakan salah satu browser berikut. Download dan Install, seluruhnya gratis untuk digunakan.

We're Moving Forward.

This Site Is No Longer Supporting Out-of Date Browser.

If you are viewing this message, it means that you are currently using Internet Explorer 8 / 7 / 6 / below to access this site. FYI, it is unsafe and unable to render the latest CSS improvements. Even Microsoft, its creator, wants you to install more modern browser.

Best viewed with one of these browser instead. It is totally free.

  1. Google Chrome
  2. Mozilla Firefox
  3. Opera
  4. Internet Explorer 9
Close