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sssddt 发表于 2017-4-10 21:49 
你的理解有误,900 ANSI Lumens = 3750 Lumens
目前,极米H1的亮度在LED光源1080P分辨率DLP投影机中是顶 ...
ANSI lumens就是用來描述投影儀亮度的單位,所有投影儀的亮度lumens都是指的ANSI lumens (ANSI lumens
The light output of projectors (including video projectors) is typically measured in lumens. A standardized procedure for testing projectors has been established by the American National Standards Institute, which involves averaging together several measurements taken at different positions.[13] For marketing purposes, the luminous flux of projectors that have been tested according to this procedure may be quoted in "ANSI lumens", to distinguish them from those tested by other methods. ANSI lumen measurements are in general more accurate than the other measurement techniques used in the projector industry.[14] This allows projectors to be more easily compared on the basis of their brightness specifications.
The method for measuring ANSI lumens is defined in the IT7.215 document which was created in 1992. First the projector is set up to display an image in a room at a temperature of 25 degrees Celsius. The brightness and contrast of the projector are adjusted so that on a full white field, it is possible to distinguish between a 5% screen area block of 95% peak white, and two identically sized 100% and 90% peak white boxes at the center of the white field. The light output is then measured on a full white field at nine specific locations around the screen and averaged. This average is then multiplied by the screen area to give the brightness of the projector in "ANSI lumens".[15])摘自Wikipedia
傳統的投影儀入門級XGA的都可以達到3000 ANSI lumens。而根據我的經驗,如果有陽光大窗戶的房間而窗簾不太給力的情況下,最低的投影亮度需要做到2500ANSI lumens以上。可以看出這種便攜投影儀的亮度比傳統3CCD的投影儀要差非常多,所以只能在投影範圍很小的情況下保持一定的亮度,作為家用替代電視是可以的,但是作為家庭影院投影到80-100英寸甚至以上的屏幕上這點亮度絕對不夠。
雖然我不是製造投影儀的,但是作為一個多媒體技術從業人員,這麼多年經手的投影儀也有上百個,商家的噱頭還是沒法糊弄過我的。沒有任何貶義,只是讓大家更了解這個投影儀的真實參數和使用範圍,免得他們海淘回來的東西吃灰而已。盒子哥你推薦的海美迪還是很好用的,我媽現在每天都看 |
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