home_bin/video/yuv422_to_png.py

# Author : sherin.s@gmail.com (Sherin Sasidhan)
# Date   : 05-Oct-2010
 
import Image
import sys
from struct import *
import array
 
if len(sys.argv) != 4:
        print "***** Usage syntax Error!!!! *****\n"
        print "Usage:"
        print "python <script> <.yuv file uyvy422> <width&gt> <height> "
        sys.exit(1) # exit
else:
        pass
 
image_name = sys.argv[1]
width = int(sys.argv[2])
height = int(sys.argv[3])
 
y = array.array('B')
u = array.array('B')
v = array.array('B')
 
f_uyvy = open(image_name, "rb")
f_uv = open(image_name, "rb")
f_uv.seek(width*height, 1)
 
image_out = Image.new("RGB", (width, height))
pix = image_out.load()
 
print "width=", width, "height=", height
 
for i in range(0,height):
    for j in range(0, width/2):
        u  = ord(f_uyvy.read(1));
        y1 = ord(f_uyvy.read(1));
        v  = ord(f_uyvy.read(1));
        y2 = ord(f_uyvy.read(1));
 
        B = 1.164 * (y1-16) + 2.018 * (u - 128)
        G = 1.164 * (y1-16) - 0.813 * (v - 128) - 0.391 * (u - 128)
        R = 1.164 * (y1-16) + 1.596*(v - 128)
        pix[j*2, i] = int(R), int(G), int(B)
 
        B = 1.164 * (y2-16) + 2.018 * (u - 128)
        G = 1.164 * (y2-16) - 0.813 * (v - 128) - 0.391 * (u - 128)
        R = 1.164 * (y2-16) + 1.596*(v - 128)
        pix[j*2+1, i] = int(R), int(G), int(B)
 
######################################################
# B = 1.164(Y - 16)                   + 2.018(U - 128)
# G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
# R = 1.164(Y - 16) + 1.596(V - 128)
######################################################
 
#image_out.save("out.bmp")
image_out.show()