Object tracking with Kinect and FAST
This video shows the work in progress on an algorithm for tracking objects captured by a Kinect camera using the FAST framework. FAST now comes with a Kinect module which uses libfreenect2 to stream...
Erik Smistad Blog
Vessel detection in ultrasound images using deep convolutional neural networks
The video shows our first result in the field of deep learning and convolutional neural networks. We designed a neural network which can automatically locate and segment blood vessels in real-time from B-mode ultrasound...
Visualizing learned features of a caffe neural network
After training a convolutional neural network, one often wants to see what the network has learned. The following python function creates and displays an image with all convolutions of a specific layer as shown...
OpenCL bugs
OpenCL is a great framework, however, AMD’s, NVIDIA’s and Apple’s OpenCL compilers are not. I have worked over 4 years with OpenCL and I have experienced a lot of bugs. Here I present a...
OpenCL-OpenGL interoperability problems on AMD GPUs and Linux
After experimenting with the OpenCL-OpenGL interoperability on AMD GPUs on Ubuntu Linux I got some cryptic error messages from X (see below). This happens both for the AMD APP samples like SimpleGL and my...
Level set segmentation on GPUs using OpenCL
Level sets is a mathematical method of evolving contours in Cartesian grids such as images. The method works by considering a function , called the level set function, which has one more dimension than...
Memory-mapped files using the boost library
The objective of memory mapping files is to increase I/O performance. Memory mapping a file creates a pointer to a segment in virtual memory and the actual loading is performed by the Operating System...
GPU-based Gradient Vector Flow using OpenCL
Gradient Vector Flow (GVF) is a feature-preserving diffusion of gradient information. It was originally introduced by Xu and Prince to drive snakes, or active contours, towards edges of interest in image segmentation. However, GVF...
Gaussian Blur using OpenCL and the built-in Images/Textures
If used correctly, OpenCL images / textures can give you large speedups on GPUs. In this post, I’ll show you a very short example of how to use OpenCL to blur/smooth an image. The...
Measuring runtime in milliseconds using the C++ 11 chrono library
I have been playing around with the new C++ 11 standard. It includes a nice new library called chrono which includes some useful clocks and timers. Below is an example of some macros you...
