nv21 1.0.0

Functions for reading and decoding the data of frames in NV21 format.

nv21

Functions for reading and decoding the data of frames in NV21 format.

Basically it wraps the cv2-based conversion with some check in order to avoid some confusing cv2 errors.

Available functions

• nv21_to_rgb
• read_nv21_from_file
• yuv_to_nv21

Example

import cv2
import matplotlib.pyplot as plt  # do not forget to install `matplotlib` first

import nv21


# Check the "data" folder of this repository.
img = cv2.imread('./data/example.png')[..., ::-1]  # to RGB
h, w = img.shape[:2]

nv21_data = nv21.yuv_to_nv21(
    cv2.cvtColor(img, cv2.COLOR_RGB2YUV)
)

restored_img = nv21.nv21_to_rgb(nv21_data, w, h)

# Draw results
plt.subplot(1, 3, 1)
plt.axis('off')
plt.imshow(img)

plt.subplot(1, 3, 2)
plt.axis('off')
plt.imshow(nv21_data, cmap='gray')

plt.subplot(1, 3, 3)
plt.axis('off')
plt.imshow(restored_img)

plt.show()