哪个图像用于隐写术?
哪些图像适合图像隐写术(存储在图像后面)?
特别是 JPEG、BMP 或 TIFF?
由于 JPEG 是有损的,因此如果数据隐藏在图像后面,是否有可能丢失任何数据?(使用 LS*强文本* 技术)
Which images are suitable for image steganography(Storing behind an image)?
In particular JPEG,BMP or TIFF?
As JPEG is lossy so is it possible to lose any data if it is hidden behind the image?(using LS*strong text* technique)
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从技术上讲,这些都可以使用,但您更有可能看到 jpeg 在野外使用。因为隐写术基本上是在图像中引入缺陷来隐藏消息,所以在已经有损的格式中,缺陷将不太明显,而如果位图图像中有一些偏离像素,则更有可能注意到这种差异。
您关于有损的问题仅适用于有人尝试重新保存图像的情况。例如,如果我在 Photoshop 中打开您的图像,其中隐藏着一条秘密消息,然后将其另存为 jpeg,则该图像可能会更改并破坏您的消息。通过电子邮件或网络发送文件时情况并非如此(某些 ISP 实施 jpeg 压缩以加快拨号等较慢连接的浏览速度)。
Technically any of these can be used, but you are more likely to see jpeg in use in the wild. Because the steganography is a basically introducing imperfections in the image to hide a message, the imperfections will be less noticeable in an already lossy format, whereas if you had some off pixels in a bitmapped image, one is more likely to notice the discrepancy.
Your question about being lossy only applies if someone tries to resave the image. For example if I opened your image with a secret message hidden in it in photoshop and then saved it back out as a jpeg, the image would likely change and destroy your message. This is not the case when sending a file via e-mail or the web (except in the case of some ISPs that implement jpeg compression to speed up browsing speeds for slower connections like dialup).
使用 LSB 技术的隐写术最简单的图像类型是 BMP 图像。它不是一种流行的图像类型,因为它比它的对应部分(jpg)占用更大的尺寸。
The easiest image type for Steganography using LSB technique is a BMP image. It is not a popular image type as it occupies a larger size than its counter parts(jpg).