作者查詢 / bxxl
作者 bxxl 在 PTT [ MATLAB ] 看板的留言(推文), 共26則
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5F推:除了一樓講的之外,你fit只能保證通過原本那些點,不代表08/04 13:16
6F→:fit出來的function會很smooth08/04 13:17
7F推:抱歉,看到圖了,看起來應該要很smooth08/04 13:19
1F推:用csvread之類的函數08/01 17:43
5F→:格式問題,mp4本身就有採用大量壓縮,你把他拆成一張一張的圖08/02 08:32
6F→:利用相鄰時間畫面變動不大所進行的壓縮就不見了08/02 08:33
7F→:轉回avi又是個不太壓縮的格式...08/02 08:35
8F→:如果使用跟原本格式同樣的壓縮模式,應不會再失真多少08/02 08:37
9F→:因為只是把虛胖的部份減回來08/02 08:37
2F推:舉個例子吧,畫個簡單的示意圖,標出四個角的座標,並且舉出一個07/30 14:36
3F→:長寬比2:1的矩形跟這四個點有什麼關係07/30 14:37
4F→:先不論程式怎麼寫,你至少要先知道用手畫要長怎樣07/30 14:38
16F推:這你得去google一些影像處理的東西啊08/02 08:50
17F→:比如說這個 http://ppt.cc/-BDD08/02 08:51
1F推:fft後,把不需要的頻率區間的點都設為0,再ifft回來07/28 09:49
2F→:或是設計bandpass filter,直接在time domain濾波07/28 09:51
3F推:overfitting. 你的資料量要遠大於參數個數,尤其是有雜訊時07/28 09:53
3F推:matlab看你條件判斷怎麼寫啊,你不寫當然就沒有自動忽略這回事07/28 11:14
2F推:uniform亂數只是機率上均勻分佈,丟出來有疏密不等很正常01/29 19:52
3F→:你確定你本來需要的是亂數嗎? 還是乾脆平均分割就好了?01/29 19:53
6F推:你如果寫不出規律,就只能查表啊01/05 11:36
4F推:浮點運算本來就不是完全精確的,會差一點點也很常見12/14 22:03