Forums - Image pre-processing

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Image pre-processing
caoducquan
Join Date: 2 Oct 18
Posts: 6
Posted: Wed, 2019-04-24 04:42

Dear Qcom Team,

I studied that SNPE support many methods for Image Preprocessing:

- Image Color space conversion

- Image Cropping

- Image Scaling

- Image Mean Subtraction with Image

- Image Mean Subtraction with Channel Value

For the last methond (Image Mean Subtraction with Channel Value), can we use float number for mean_value?

Besides those methods, do we support some thing like Image Mean Multiplication with Channel Value, which is similar to Image Mean Subtraction with Channel Value but use Muliplication Operation ?

Thanks and regards,

CDQ

 

 

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gesqdn-forum
Join Date: 4 Nov 18
Posts: 184
Posted: Tue, 2019-09-17 00:12

Q1 : For the last method (Image Mean Subtraction with Channel Value), can we use float number for mean_value?
Ans : As long as the pixel values are normalized, mean_value can take float numbers. In case, if normalization is not preferred, then we cannot use float number for mean_value.

Q2 : Besides those methods, do we support some thing like Image Mean Multiplication with Channel Value, which is similar to Image Mean Subtraction with Channel Value but use Muliplication Operation ?
Ans : Image mean subtraction is a technique for data preparation in order to center the pixel values on the value of zero. This approach is called centering . Using the method of multiplication we cannot achieve this and hence it is not supported in such cases.  

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