array size notation

2012 3 24
2 个回答
回答已采纳
2 次查看（30 天）

0 个投票

Hi,
I have a doubt in working with Images. An image is represented in MATLAB in the form of row multiplied with columns.
3D image has been represented as for e.g., 256 * 208 *2...
In the above example, 256 indicates rows. 208 indicates columns..
Could you tell me 2 indicates what factor exactly.
Could you explain the same concept for 4D images also.
Thanks & Regards,
Siva
vlsiva@yahoo.co.in
9003241032

请先登录，再回答此问题。

 采纳的回答

Jan
Jan 2012-3-24

0 个投票

The rows and columns are not multiplied. "256 * 208 * 2" means, that the array has the dimensions [256, 208, 2]. The trailing 2 could mean, that each pixel of a 2D plane has 2 color components, e.g. hue and saturation or red and blue. Or the first component can be the Z-value, while the second one is the grey level.
There is no standard definition for 4D images (as there is no for 3D images). It could be a movie, when the 4th component is the time and the first 3 components are RGB images.
Is it clearer now? The numbers are not factors, but the dimension of a kind of table.

更多回答（1 个）

0 个投票

Hi Jan, Thanks for your reply. consider the following. You are standing. a train is running on your background. Now i am capturing this situation.
Whether the obtained image is a 4D image.
Regards. Siva

2 个评论
显示 无 隐藏 无

Jan
Jan 2012-3-27
I do not understand the statement. Is this a question? Do you want to know, if this situation can be represented as 4D array? If so, it depends on what you call "capturing". Taking a movie on tape means discrete 5D data usually: 2D matrix of [1x3] RGB value, one for each frame, plus sound. On the other hand these data are stored sequentially on the tape, so you actually have an 1D data stream...
capturing means, just a still image. not a video

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Convert Image Type 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by