No Grayscale in ov::preprocess::ColorFormat?

jrrw1 · ‎03-25-2023

Hello, I am currently trying to deploy a cv model in C++ using Openvino API.

My model only takes in grayscale images. When I set up my PrePostProcessor input preprocess, there is no grayscale in ov::preprocess::ColorFormat. This is confirmed in ColorFormat documentation.

The code below is the correct way to do this with an RBG image, however I am unsure how to achieve this with grayscale, as GRAY is not supported in ov::preprocess::ColorFormat. Any help is greatly appreciated!

// Inizialize Preprocessing for the model
ov::preprocess::PrePostProcessor ppp = ov::preprocess::PrePostProcessor(model);

// Specify input image format
ppp.input().tensor().set_element_type(ov::element::u8).set_layout("NHWC").set_color_format(ov::preprocess::ColorFormat::BGR);

// Specify preprocess pipeline to input image without resizing  
  ppp.input().preprocess().convert_element_type(ov::element::f32).convert_color(ov::preprocess::ColorFormat::RGB).scale({255., 255., 255.});

Wan_Intel · ‎03-28-2023

Hi Jrrw1,

Thanks for reaching out to us.

Input color format for preprocessing in OpenVINO™ Inference Engine C++ API are as follows:

RAW
RGB
BGR
RGBX
BGRX
NV12
I420

For more information, please refer to the enum InferenceEngine::ColorFormat.

Regards,

Wan

Wan_Intel · ‎04-12-2023

Hi Jrrw1,

Thanks for your question.

Please submit a new question if additional information is needed as this thread will no longer be monitored.

Regards,

Wan