送交者: Yush 于 2007-11-28, 10:05:56:

回答: 看看，这才是嫦娥造假的专业指责 由 阳明 于 2007-11-28, 09:20:39:

• I have never heard of such thing, and I don't think there is any use of it. (无内容) - steven (0 bytes) 2007-11-28, 10:36:38 (187369)
  • 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)
• 不可见数字水印？估计一个copy and paste就没了 (无内容) - 4U4luC2 (0 bytes) 2007-11-28, 10:25:57 (187362)
  • 不可见数字水印是变换域嵌入的， - Yush (90 bytes) 2007-11-28, 10:39:26 (187371)
    • 以牺牲原图的原始信息为代价 (无内容) - 4U4luC2 (0 bytes) 2007-11-28, 10:52:01 (187386)
      • 数字水印指标之一是信噪比要控制住可接受范围内 - Yush (38 bytes) 2007-11-28, 11:16:31 (187404)
        • 黑白照片没有多少原始信息经得住故意丢失 (无内容) - 4U4luC2 (0 bytes) 2007-11-28, 11:19:46 (187405)
          • 黑白照片是供人看的，丢一点儿信息人眼也觉察不出 - Yush (130 bytes) 2007-11-28, 11:28:43 (187411)

加跟贴