Before convolution neural network processing, image data generally needs to be pre-processed. The basics of some pre-processing techniques that can be applied to any kind of data are as follows:
- Mean subtraction
- Normalization
- PCA and Whitening
Call the setMeanScaleBGR function to implement
the mean subtraction and normalization, as shown in the following figure. See the
Vitis-AI/src/vai_library/dpu_task/include/vitis/ai/dpu_task.hpp file for
details.
Figure 1. setMeanScaleBGR Example
Call the cv::resize function to scale
the image, as shown in the following figure.
Figure 2. cv::resize Example
