VideoCapture in both OpenCV 2.1 and 2.2 under the platform Ubuntu 10.10 64-bit keeps showing annoying warning messages when it reads some .avi files:
[swscaler @ 0x81ac360]No accelerated colorspace conversion found from yuv420p to bgr24
Surprisingly, there are only few people have such a problem after I googled for a while, and no solution as well.
I then traced the code and found that the issue should belong to FFmpeg.
continue reading…
From Wikipedia:
The traditional approach of computer graphics has been used to create a geometric model in 3D and try to reproject it onto a two-dimensional image.
Computer vision, conversely, is mostly focused on detecting, grouping, and extracting features (edges, faces, etc.) present in a given picture and then trying to interpret them as three-dimensional clues.
So I am more like a vision guy…
Recently I tried to install OpenCV 2.1 with pre-built package released on the official website for my Windows 7 64-bit laptop. It turns out that OpevnCV 2.1 doesn’t marry well with 64-bit windows system (after 1 day googling).
這是我剛剛突然發現一年前存的草稿，當時居然忘了完成它@@！
到底圖論裡面的碎形可以做什麼用途，一直是我心中的一個疑惑。直到接觸了關於高維資料的資料庫索引(indexing high-dimenional data)演算法，才發現除了碎形可以自身遞回產生神奇的美麗圖案外，一些特定的碎形規則還有一個特性，即是空間填滿(space-filling)。然而，當直接拿碎形來做索引應用時，會遇到許多根本與實作上的困難，前者包括邊界效應(boundary effect)、群集特性(clustering property)等；後者則有資料稀疏(sparsity)、大數(big number)等問題。這些都是我在實作時碰上的難題，其中邊界效應有許多研究特別針對此現象來做改善，這方面我相信已有不錯的解決方案，然其它議題仍有討論的空間。
Finally I have updated my WordPress. The previous one was 2.5.x, and now everything is changed.
I need to get used to it again Q__Q
Nevertheless, it is amazing that WordPress can automatically upgrade!
Apture got a new version too!!
Suddenly found that I have almost not blogged for one year…
