what does 4D of an image indicates?
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2D means, row and columns of an image.. 3D means.. row,column,RGB... in 4D, what are the dimensions it indicates?
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Image Analyst
2013-3-12
If you have multiple multispectral images then it's a 4D image, for example a stack of color confocal microscopy images where each slice/layer is a 3 color (RGB) image. Or the Visible Human though they may store their data in some special format on disk.
Another example would be a color video where each color frame is a 3D image but you have multiple frames taken at different times. So the 4th dimension is time.
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Jan
2013-3-12
It depends. The 4th component could mean an alpha channel, see "RGBA". Or the image is not stored in RGB colors, but in the CMYK color model. Or you have 4 different layers of grayscale images, e.g. stored in a TIFF file. Or it is any other 4 channel image taken by a camera which records 4 different wavelengths, perhaps green and 3 different infra-read-channels.
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Walter Roberson
2013-3-12
The 4th dimension is probably for an image sequence. I(:,:,:,J) being for the J'th image.
Image Analyst
2013-3-12
A multispectral image is a 3D image no matter how many spectral channels it has. If you have multiple multispectral images then it's a 4D image, for example a stack of color confocal microscopy images where each slice/layer is a 3 color (RGB) image.
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