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AkiyoshiKitaoka's profile
Akiyoshi Kitaoka
Akiyoshi Kitaoka
Akiyoshi Kitaoka
@AkiyoshiKitaoka

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Akiyoshi Kitaoka

@AkiyoshiKitaoka

I am an experimental psychologist who studies visual illusions as well as makes illusion artworks. #illusion #opticalillusion #perception #錯視

Kyoto, Japan
ritsumei.ac.jp/~akitaoka/inde…
Joined December 2011

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    1. Akiyoshi Kitaoka‏ @AkiyoshiKitaoka Mar 10
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      Differences in perceived speedpic.twitter.com/bwOeeAnKV8

      4 replies 156 retweets 617 likes
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    2. Akiyoshi Kitaoka‏ @AkiyoshiKitaoka Mar 21
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      A demo of 8-stroke reversed phi motion (not Mather's 4-stroke apparent motion made up of phi and reversed phi): This movie consists of eight frames that are obtained from two original images, but the train and the freight train appear to keep advancing.pic.twitter.com/LMyFVIG04r

      2 replies 4 retweets 35 likes
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    3. Akiyoshi Kitaoka‏ @AkiyoshiKitaoka Mar 21
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      @takkawabe この永久機関風の動画デモは、2枚の画像からの合成で(合成により、8フレームを生成。最小は、4フレーム)、リバースファイを研究していて、本日必然のように到達したアイデアですが、河邉先生のデモに同様なものを見たことがあるような気がするのですが、いかがでしょうか。

      1 reply 0 retweets 1 like
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    4. 河邉 隆寛‏ @takkawabe Mar 21
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      Replying to @AkiyoshiKitaoka

      私のやつは、3, 4フレームにおいて高周波だけを反転させても4ストローク運動がみえるというものでした。そうすることで、フリッカ印象を低減させることを目的としていました。今回の北岡先生のデモでは、恐らく高周波を反転させてもさせつつ低周波はグレーにしておられる感じでしょうか?面白いです!

      1 reply 0 retweets 2 likes
    5. Akiyoshi Kitaoka‏ @AkiyoshiKitaoka Mar 21
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      Replying to @takkawabe

      御覧頂いたデモは、動画から仮現運動を表現できる2枚の画像を用いて、2枚目は反転画像としていました。それはオリジナルのリバースファイらしくてその点はよかったのですが、気持ちの悪い点がありまして、修正したのが添付のデモです(8 frames)。1枚の画像のポジとネガを往復します。(続く)pic.twitter.com/zxTC0JMhtC

      1 reply 0 retweets 1 like
    6. Akiyoshi Kitaoka‏ @AkiyoshiKitaoka Mar 21
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      Replying to @AkiyoshiKitaoka @takkawabe

      ポジ→ネガ間あるいはネガ→ポジ間に、運動の差分の画像を入れます。変幻灯の原理と同じと思います。高周波を反転、ということはしていませんが、リバースファイなので、同じ働きをする変換なのかもしれません。pic.twitter.com/8w9q6FT2OB

      2 replies 3 retweets 3 likes
      Akiyoshi Kitaoka‏ @AkiyoshiKitaoka Mar 21
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      Replying to @AkiyoshiKitaoka @takkawabe

      4ストロークのデモはこちら(4ストロークものはフリッカーが強い感じなのでツイートしていなかったのですが、この程度なら大丈夫だろうとツイートしました)。ポジとネガで位置が同じであることがわかると思います。一つ前のツイートの図でいうと、左上→右上→右下→左下の4枚の画像の繰り返しです。pic.twitter.com/9qQPTHJ79L

      11:16 PM - 21 Mar 2020
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      • HIMUKA
      1 reply 0 retweets 1 like
        1. New conversation
        2. Akiyoshi Kitaoka‏ @AkiyoshiKitaoka Mar 21
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          Replying to @AkiyoshiKitaoka @takkawabe

          2枚目のネガ画像は次の運動フレームのものである4ストロークのリバースファイのデモ。本質的には同じことなので、これでもいいかな。(何を言っているのか作者にしかわからないかもしれない、すみません)pic.twitter.com/vfig5mFcg2

          1 reply 0 retweets 1 like
        3. Akiyoshi Kitaoka‏ @AkiyoshiKitaoka Mar 21
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          Replying to @AkiyoshiKitaoka @takkawabe

          ちなみに、Mather先生の4ストローク運動で作ったデモは、こちらです。pic.twitter.com/o2eC79AyBQ

          0 replies 0 retweets 1 like
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