added the imageio instead of opencv

[sushmanthreddy]

close #56

Replace OpenCV with imageio for Image Reading and Normalization

This update modifies the CustomImageParam and MaskedImageParam class to remove its dependency on OpenCV for reading images and converting color spaces. Instead, we utilize imageio, which simplifies the process by natively reading images in the desired RGB format and allows for direct normalization without additional steps. The primary change is in the __init__ method, where we replaced OpenCV operations with imageio functionality.

Changes:

• Removed import for cv2.
• Added import for imageio.
• Updated the __init__ method to use imageio.imread for reading the image, automatically handling RGB conversion and normalization.

Code Change:

# Before:
import cv2
...
if isinstance(image, str):
    image = cv2.cvtColor(cv2.imread(image), cv2.COLOR_BGR2RGB)/255.
    image = torch.tensor(image).permute(-1,0,1).unsqueeze(0)

# After:
import imageio
...
if isinstance(image, str):
    image = imageio.imread(image) / 255.0  # Reads in RGB and normalizes
    image = torch.tensor(image).permute(2, 0, 1).unsqueeze(0)

This modification significantly reduces the dependency footprint by eliminating the need for OpenCV, which is a larger library used minimally in this context. It simplifies the codebase and leverages imageio for efficient image processing, making the project lighter and more focused on its specific requirements.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.03%. Comparing base (df90177) to head (0876aa7).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #59   +/-   ##
=======================================
  Coverage   83.03%   83.03%           
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  Files          22       22           
  Lines         825      825           
=======================================
  Hits          685      685           
  Misses        140      140           

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