5

Can someone explain to me what is NHCW format? I am working with the Jenson Inference library and for object detection the first step is called "Pre-Process" and it converts the image to NCHW format, but I don't know what this format is.

jonrsharpe
  • 115,751
  • 26
  • 228
  • 437
Esteban Gamez
  • 61
  • 1
  • 2

2 Answers2

9

NCHW stands for:

batch N, channels C, depth D, height H, width W

It is a way to store multidimensional arrays / data frames / matrix into memory, which can be considered as a 1-D array. You may have a look to this link for further information. There also exist variants of this format with different ways of "casting" the multidimensional data into one.

mranvick
  • 339
  • 1
  • 2
  • 10
2

NCHW is an acronym describing the order of the axes in a tensor containing image data samples.

  • N: Number of data samples.

    C: Image channels. A red-green-blue (RGB) image will have 3 channels.

    H: Image height.

    W: Image width.

Source

Mahmoud Maghrabi
  • 941
  • 6
  • 6