ASCII立體圖(ASCII stereogram),是ASCII藝術的一種形式,它利用觀察圖像時,令視線產生適當的交叉從而生成三維圖像的錯視。
以圖1為例,為了得到三維效果,觀察者需要使眼睛偏離聚焦狀態,這樣同一行中的兩個相鄰字符就會貼近到一起。為了幫助聚焦,努力使兩個頂上的兩個大寫字母 O 看起來像三個,確保中間那個 O 的圖像穩定並且位於焦點之上。一旦做到了這一點,往下看下面的圖像,這時三維效果就很明顯了:7列字母會呈現遠近相間的視覺效果。如果圖 1 底部的兩個 O 看起來像三個,那麼遠近效果就會相反。另外也可以通過視線交叉觀察到相反的三維效果。
O O n n n n n n n n n n n n n n n n n f f f f f f f f f f f f f f e e e e e e e e e e e e e e e e e a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r O O
圖 2 的效果更加有戲劇性。一旦看到了三維效果,觀察者漸漸遠離屏幕,垂直線將會變得更深,因而增加立體效果,水平或者豎直方向稍微移動也會產生有趣的效果。
O O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
圖 3 根據與單圖像隨機點立體圖(Single Image Random Dot Stereogram,簡稱 SIRDS)同樣的思想顯示了一個單圖像隨機文本立體圖(Single Image Random Text Stereogram,簡稱 SIRTS)。當立體圖像變得清楚的時候就可以看到浮雕中的「Hi」。
O O OIWEQPOISDFBKJFOIWEQPOISDFBKJFOIWEQPOISDFBKJFOIWEQPOISDFBKJF EDGHOUIEROUIYWEVDGHOXUIEROIYWEVDGHEOXUIEOIYWEVDGHEOXUIEOIYWE KJBSVDBOIWERTBAKJBSVEDBOIWRTBAKJBSOVEDBOWRTBAKJBSOVEDBOWRTBA SFDHNWECTBYUVRGSFDHNYWECTBUVRGSFDHCNYWECBUVRGSFDHCNYWECBUVRG HNOWFHLSFDGWVRGHNOWFGHLSFDWVRGHNOWSFGHLSDWVRGHNLOWSFGLSDWVRG YPOWVXTNWFECHRGYPOWVEXTNWFCHRGYPOWNVEXTNFCHRGYPWOWNVETNFCHRG SVYUWXRGTWVETUISVYUWVXRGTWVETUISVYUWVXRGWVETUISVYUWVXRGWVETU WVERBYOIAWEYUIVWVERBEYOIAWEYUIVWVERBEYOIWEYUIVWLVERBEOIWEYUI EUIOETOUINWEBYOEUIOEWTOUINWEBYOEUIOEWTOUNWEBYOETUIOEWOUNWEBY WFVEWVETN9PUW4TWFVEWPVETN9UW4TWFVETWPVET9UW4TWFBVETWPET9UW4T NOUWQERFECHIBYWNOUWQXERFECIBYWNOUWFQXERFCIBYWNOFUWFQXRFCIBYW VEHWETUQECRFVE[VEHWERTUQECFVE[VEHWQERTUQCFVE[VEOHWQERUQCFVE[ UIWTUIRTWUYWQCRUIWTUYIRTWUWQCRUIWTXUYIRTUWQCRUIBWTXUYRTUWQCR IYPOWOXNPWTHIECIYPOWTOXNPWHIECIYPONWTOXNWHIECIYLPONWTXNWHIEC R9UHWVETPUNRQYBR9UHWVETPUNRQYBR9UHWVETPUNRQYBR9UHWVETPUNRQYB
有人在電子郵件末尾或者新聞文章後面用立體圖作為「簽名」,圖 4 就是一個這樣的例子。
IIIIIIIIIIIIIII IIIIIIIIIIIIIII H ( ) \|/ H H ( ) \|/ H H( ) -O- H H ( ) -O- H H )/|\ H H ( ) /|\ H H======^======H H======^======H H- |----@-----H H----| ---@---H H /|\ @\|/ @ H H /|\@ \|/@ H H \|/ \|/ H H \|/ \|/H III^IIIIIII^III III^IIIIIII^III Wide eyed stereo Wide eyed stereo
立體效果可以用於突出文本中的單個字詞作為「秘密消息」,當段落調整的時候這個效果可能就被隱藏起來。
According to the According to the police inspector, police inspector, Edward John Billings, Edward John Billings, there are too many there are too many individuals too close individuals too close to the case to make to the case to make an arrest. I asked an arrest. I asked Mary Smith to comment Mary Smith to comment on the case, but she on the case, but she declined to comment, declined to comment, because she is soon because she is soon to be married to to be married to Howard D. Fredericks, Howard D. Fredericks, the victim's uncle. the victim's uncle. Charles Wilson, the Charles Wilson, the victim's brother, victim's brother, stated that the chaos stated that the chaos was responsible for was responsible for at least five suicide at least five suicide attempts last week attempts last week alone. alone.
另外也可以實現 ASCII 立體圖動畫。
致謝
圖 1、2、3 與 4 分別歸屬於 David B. Thomas、Jonathan Bowen、Charles Durst 與 Marty Hewes。這四幅立體圖出現在公開的 alt.3d USENET 新聞組 中。圖 5 是一位維基人現場作出來的。
最初由 ASCII Stereograms 的作者改編而來,並且得到了作者的許可。
外部連結
Wikiwand in your browser!
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.