The Improved Harris Operator based on Steerable Filter

Abstract

The conventional Harris corner detection operator is improved to enhance the missing rate and the detection capability of false corners in this paper. With the materials recognition on automated logistics and packaging line as an example, the acquired images were firstly pretreated to achieve the grayscale images. The rotations of four different angles were performed by the steerable filter based on the grayscale and the corner points were detected. Finally the authenticity corner points were determined through the integrated logic operations. The image data pre-processed was detected using the improved Harris corner operator and compared with the data by the traditional corner detection operator. The false detection rate was decreased to 1.3 % and the missing rate reduced to 2.9% in the experiment. The results show that the improved operator has a strong capability of discerning authenticity angular point and this method can effectively improve the recognition accuracy of corner detection operator.

Image Restoration Effect on DCT High Frequency Removal and Wiener Algorithm for Detecting Facial Key Points

“…In the test with ORL dataset, any changes in detected keypoints were dependent on the processed image while in the test with Head Pose Image Database, there was an increase from when detecting the original grayscale image with images that had been processed with DCT & Wiener Filtering. According to the research by [26], it is known that the Harris-Stephens do not have a definite way to describe the threshold value, which is necessary to define a descriptor [27].…”

“…Through visual observation on ORL database, the images had more noise rather than in Head Pose Image Database. According to the research conducted by [26], due to the ability of FAST to detect actual corner-points, the greater the noise, the more likely it is to detect the facial key points. However, because F-Score calculation is based on total of all keypoints detected, FAST feature detector fails to deliver the best results.…”