I have never heard of such thing, and I don't think there is any use of it.

I have never heard of such thing, and I don't think there is any use of it.

所有跟贴·加跟贴·新语丝读书论坛

送交者: steven 于 2007-11-28, 10:36:38:

回答: NASA月照肯定还有不可见数字水印由 Yush 于 2007-11-28, 10:05:56:

an application of digital image processing for copyrite protection - Yush (129 bytes) 2007-11-28, 10:41:58 (187377)
- 那是可见数字水印 - 4U4luC2 (129 bytes) 2007-11-28, 10:49:55 (187382)
  - Steganography是广义的，包括了Digital watermarking - Yush (280 bytes) 2007-11-28, 11:11:21 (187399)
    - 对这玩意不能用wiki - eng (93 bytes) 2007-11-28, 12:03:50 (187425)
      - wiki没错，是我说错了 - Yush (103 bytes) 2007-11-28, 12:40:40 (187440)
        
        你有没有注意到 - eng (369 bytes) 2007-11-28, 13:04:35 (187458)
        
        还真没有注意呢 - Yush (225 bytes) 2007-11-28, 13:23:58 (187481)
        
        如果没有问题就不会在页首有那么多警告信息 - eng (44 bytes) 2007-11-28, 13:34:06 (187491)
    - 确实是，我道歉 (无内容) - 4U4luC2 (0 bytes) 2007-11-28, 11:34:35 (187414)
- I meant that I had never heard NASA using digital signature - steven (140 bytes) 2007-11-28, 10:48:33 (187381)
  - maybe you'r right - Yush (94 bytes) 2007-11-28, 11:12:26 (187402)
  - now they do. (have a need) :))) (无内容) - Enlighten (0 bytes) 2007-11-28, 10:51:30 (187385)
  - It is partly due to freedom of information act, that government - steven (58 bytes) 2007-11-28, 10:51:23 (187384)
    - freely accessible - eng (270 bytes) 2007-11-28, 13:58:42 (187507)