Canon 最具代表性的夜拍機登場 IXUS 300 HS

superspell

1104分

11樓

superspell

個人積分：1104分

文章編號：20410027

crusher wrote:
找了下國外網站，對於...(恕刪)

計算機按一按(概算)就可以知道了....:)

16 G X 1000 (M/G) / 84 (分鐘) / 60 (秒/分) X 8 (bit/Byte) = 25.3968........

我是另外下載大陸的評測所提供的影片原始檔在用軟體去打開錄製資訊來看的.....碼率是24-25Mbps, 編碼是H.264 baseline profile. Level卻是詭異的L4.1. (P.S. Level 4.1對應的是解析度1280 X 720 @ 68.3P (每秒68.3張畫面), 300HS只有30P, 用L3.1就好了, 為何要用L4.1??)

既然碼率都是24Mbps, 那幹嘛不繼續用效率差的Motion JPEG格式就好? 很多便宜機器都是Moiton JPEG壓縮的..

superspell

1104分

12樓

superspell

個人積分：1104分

文章編號：20410267

smallp0212 wrote:
噪比如何?要看看再說...(恕刪)

低光源下噪訊超好. 傳統CCD/CMOS都比不上, 這是BSI的特色, ...但是在光線好的室外, 一般image sensor 畫質(顏色飽和度和分辨率)是會越來越好, 但是BSI可能不是那麼一回事.....

各大論壇越來越多抱怨的聲音. 在本站的Sony版可以看看關於TX5/TX7, HX5V等使用BSI的經驗分享....

以下節錄國外論文相關說法, 供大家參考.

From SPIE's Optical Engineering "Charge diffusion in the field-free region of charge-coupled devices". The abstract reads

The potential well in back-illuminated charge-coupled devices (CCDs) does not reach all the way to the back surface. Hence, light that is absorbed in the field-free region generates electrons that can diffuse into neighboring pixels and thus decreases the spatial resolution of the sensor. We present data for the charge diffusion from a near point source by measuring the response of a back-illuminated CCD to light emitted from a submicron diameter glass fiber tip. The diffusion of electrons into neighboring pixels is analyzed for different wavelengths of light ranging from 430 to 780 nm. To find out how the charge spreading into other pixels depends on the location of the light spot; the fiber tip could be moved with a piezoelectric translation stage. The experimental data are compared to Monte Carlo simulations and an analytical model of electron diffusion in the field-free region. The presented analysis can be used to predict the charge diffusion in other back-illuminated sensors, and the experiment is universally applicable to measure any type of sensors.

Courtesy
Ralf Widenhorn, Alexander Weber-Bargioni, Morley M. Blouke, FELLOW SPIE; Albert J. Bae, and Erik Bodegom, MEMBER SPIE Portland State University, Department of Physics, 1719 South West 10th Avenue, Suite 128, Portland, Oregon 97207-0751