[英]How can I use opencv-python to convert RGB888 to RGB565 in python?
I would like to read camera image by opencv-python and send image raw data (byte array) in RGB565 format to device.我想通过opencv-python读取相机图像并将 RGB565 格式的图像原始数据(字节数组)发送到设备。 Here are some testing codes:
下面是一些测试代码:
import cv2
cam = cv2.VideoCapture(0) # open camera
flag, image = cam.read() # read image from camera
show = cv2.resize(image, (640, 480)) # resize to 640x480
show = cv2.cvtColor(show, cv2.COLOR_BGR2RGB) # convert to RGB888
After codes run, it returned "show" ndarray (numpy) by cvtColor at last line, the "show" ndarray info is:代码运行后,它在最后一行通过 cvtColor 返回“show” ndarray (numpy), “show” ndarray 信息为:
>>> show.shape
(480, 640, 3)
>>> show.dtype
dtype('uint8')
>>> show.size
921600
I don't see any convert code about cv2.COLOR_BGR2RGB 565 , is there any other function to support RGB888 to RGB565?我没有看到任何关于 cv2.COLOR_BGR2RGB 565的转换代码,是否还有其他 function 支持 RGB888 到 RGB565?
Or someone knows how to convert ndarray RGB888 to RGB565?或者有人知道如何将ndarray RGB888 转换为 RGB565?
I think this is right but don't have anything RGB565 to test it on:我认为这是正确的,但没有任何 RGB565 可以对其进行测试:
#!/usr/bin/env python3
import numpy as np
# Get some deterministic randomness and synthesize small image
np.random.seed(42)
im = np.random.randint(0,256,(1,4,3), dtype=np.uint8)
# In [67]: im
# Out[67]:
# array([[[102, 220, 225],
# [ 95, 179, 61],
# [234, 203, 92],
# [ 3, 98, 243]]], dtype=uint8)
# Make components of RGB565
R5 = (im[...,0]>>3).astype(np.uint16) << 11
G6 = (im[...,1]>>2).astype(np.uint16) << 5
B5 = (im[...,2]>>3).astype(np.uint16)
# Assemble components into RGB565 uint16 image
RGB565 = R5 | G6 | B5
# Produces this:
# array([[26364, 23943, 61003, 798]], dtype=uint16)
Or, you can remove your cv2.cvtColor(show, cv2.COLOR_BGR2RGB)
and swap the indices to:或者,您可以删除
cv2.cvtColor(show, cv2.COLOR_BGR2RGB)
并将索引交换为:
R5 = (im[...,2]>>3).astype(np.uint16) << 11
G6 = (im[...,1]>>2).astype(np.uint16) << 5
B5 = (im[...,0]>>3).astype(np.uint16)
Why not use the usual cvtColor()
function from OpenCV?为什么不使用 OpenCV 中的常用
cvtColor()
function? I see enums such as COLOR_BGR2BGR565
, COLOR_BGR5652BGR
, COLOR_BGR5652RGB
, and COLOR_RGBA2BGR565
among others.我看到了诸如
COLOR_BGR2BGR565
、 COLOR_BGR5652BGR
、 COLOR_BGR5652RGB
和COLOR_RGBA2BGR565
等枚举。 Wouldn't it be better to use OpenCV to do the conversion vs writing your own?使用 OpenCV 进行转换与自己编写不是更好吗?
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