![]() I was able to extract features from my dataset of pills, index them, and then identify my test set of pills regardless of how they were oriented… Regardless of how the pill was rotated, I wanted the output feature vector to be (approximately) the same (the feature vectors will never be to completely identical in a real-world application due to lighting conditions, camera sensors, floating point errors, etc.).Īfter the first week I was making fantastic progress. Was I not matching the features correctly? Was there a flaw in the logic of my feature extraction algorithm? My method was only working with round, circular pills - I was getting completely nonsensical results for oblong pills. While I might have been ashamed to admit this as a graduate student, the problem was the latter: Or was it something else entirely… like a problem with my image preprocessing. It turns out that during the image preprocessing phase, I was rotating my images incorrectly. Since round pills have are approximately square in their aspect ratio, the rotation bug wasn’t a problem for them. Here you can see a round pill being rotated a full 360 degrees without an issue: Figure 1: Rotating a circular pill doesn’t reveal any obvious problems.īut for oblong pills, they would be “cut off” in the rotation process, like this: Figure 2: However, rotating oblong pills using the OpenCV’s standard cv2.getRotationMatrix2D and cv2.warpAffine functions caused me some problems that weren’t immediately obvious. In essence, I was only quantifying part of the rotated, oblong pills hence my strange results. I spent three weeks and part of my Christmas vacation banging my head against the wall trying to diagnose the bug - only to feel quite embarrassed when I realized it was due to me being negligent with the cv2.rotate function. How did I accomplish this and squash the bug for good? You see, the size of the output image needs to be adjusted, otherwise, the corners of my image would be cut off. To learn how to rotate images with OpenCV such that the entire image is included and none of the image is cut off, just keep reading. Looking for the source code to this post? Jump Right To The Downloads Section Rotate images (correctly) with OpenCV and Python ![]() In the remainder of this blog post I’ll discuss common issues that you may run into when rotating images with OpenCV and Python. To make sure we all understand this rotation issue with OpenCV and Python I will: Specifically, we’ll be examining the problem of what happens when the corners of an image are “cut off” during the rotation process. Start with a simple example demonstrating the rotation problem. Provide a rotation function that ensures images are not cut off in the rotation process. # construct the argument parse and parse the argumentsĪp.add_argument("-i", "-image", required=True, Open up a new file, name it rotate_simple.py, and insert the following code: # import the necessary packages Let’s get this blog post started with an example script.ĭiscuss how I resolved my pill identification issue using this method. On FreeBSD, SDL can be installed using the devel/sdl20 package or port.BG CHANNEL OFFSET.X CLICKTEAM FUSION 2.5 HOW TOīG CHANNEL OFFSET.X CLICKTEAM FUSION 2.5 FULLīG CHANNEL OFFSET.X CLICKTEAM FUSION 2.5 CODEīG CHANNEL OFFSET.X CLICKTEAM FUSION 2.5 DOWNLOAD SDL provides a low-level abstraction to the hardware which can sometimes be more efficient than the Xorg interface. SDL: the Simple Directmedia Layer is a porting layer for many operating systems, allowing cross-platform applications to be developed which make efficient use of sound and graphics. The next section describes how to determine if this extension is running. This extension provides good quality playback even on low-end machines. XVideo: an extension to the Xorg interface which allows video to be directly displayed in drawable objects through a special acceleration. Common Address Redundancy Protocol (CARP) File and Print Services for Microsoft® Windows® Clients (Samba) Dynamic Host Configuration Protocol (DHCP) Lightweight Directory Access Protocol (LDAP) Locale Configuration for Specific Languages ![]() ![]() FreeBSD as a Guest on VMware Fusion for macOS® FreeBSD as a Guest on Parallels Desktop for macOS® RAID3 - Byte-level Striping with Dedicated Parity GEOM: Modular Disk Transformation Framework Debian / Ubuntu Base System with debootstrap(8) Installing Applications: Packages and Ports Accounts, Time Zone, Services and Hardening
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