[JPEG]4.2 Lossy and lossless compression

這禮拜五回家...



突然想到之前蕭肥有買boss推薦的影像處理課本中文版...



暫時放在我家...(其實放了一學期了...囧)


想說和standard一起看比較容易看懂...

超厚一本的...

本來還想要...
每天帶來帶去

在這份規格書中,對編碼與解碼的程序,定義了兩種類別-- lossy and lossless processes.

lossy是利用數位餘弦轉換法(Discrete Cosine Transform，簡稱DCT) .....

以下明天繼續...

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--我是原文--我是原文--我是原文--我是原文--我是原文--我是原文--





        This Specification specifies two classes of encoding and decoding processes, lossy and lossless processes. Those based on the discrete cosine transform (DCT) are lossy, thereby allowing substantial compression to be achieved while producing a reconstructed image with high visual fidelity to the encoder’s source image.


        The simplest DCT-based coding process is referred to as the baseline sequential process. It provides a capability which is sufficient for many applications. There are additional DCT-based processes which extend the baseline sequential process to a broader range of applications. In any decoder using extended DCT-based decoding processes, the baseline decoding process is required to be present in order to provide a default decoding capability.


        The second class of coding processes is not based upon the DCT and is provided to meet the needs of applications requiring lossless compression. These lossless encoding and decoding processes are used independently of any of the DCT-based processes.


A table summarizing the relationship among these lossy and lossless coding processes is included in 4.11.


        The amount of compression provided by any of the various processes is dependent on the characteristics of the particular image being compressed, as well as on the picture quality desired by the application and the desired speed of compression and decompression.

[生活]這禮拜真囧...

這學期的期中考...

只有考兩科--英文和英文...

還真是有股淡淡的哀傷阿...囧

而且全部集中在禮拜四...



往年這時候的系辦工讀生...

通常都沒啥事做...

不知死活的我...

天真的以為今年也是如此...

想說 搶錢趁現在...

期中考嘛...不就顧辦公室而已...

還可以趁機唸書...一舉兩得咧...

排班的時候...

硬是一口氣從禮拜一填到禮拜四...

連禮拜四考試前都排滿了...



沒想到今年因為工程認證&全校電腦課的問卷回收...

要整理的資料

異．常．的．多

而且...工作分配表上面也好多事...

填很多時間的我...

理所當然的被分配到很多的事...



天ㄚ...我好蠢...我好蠢...我好蠢...我好蠢...我好蠢...

整個忙碌阿...

還好只考兩科...早餐會報又暫停兩次...

不然我應該整個囧掉吧...



中間臨時有天有事...本來想請假的...

也拜託好小華幫我代班...

不過良心不安的我...

想說事情太多了...還是先去系辦做完事再走好了...

那天早上還是衝系辦...

結果...一整個做到下午五點...





唉...

虧我當初想的很美好...

本來還想說可以趁機多看點JPEG那本的...

免得一個禮拜都沒有早餐會報...

下次看太少被噹...

世事果然不能盡如人意...



最可悲的是...

好不容易禮拜一跟Kenn他們在系辦看書

趁機看了一些些

還寫了網誌...

寫了超久的說...

結果

Kenn一說要回家...

馬上很開心的關掉視窗...

關掉視窗...關掉視窗...關掉視窗...關掉視窗...

如果沒發現就算了...還可以開開心心的回宿舍...

還讓我馬上發現!!

鬱足了一整晚...殘念...

從上禮拜到這禮拜也發生了一些囧事...

好囧好囧...

看來我要去安個太歲了...

這禮拜真不是我的日子....







不過換個角度想...

也許我這週的衰運...都在囧事用掉了...

那是不是我考試就不會衰了...