Python read binary file of unsigned 16 bit integers
Question:
I must read a binary file in Python, and store its content in an array. The information I have on this file is that
filename.bin is of size 560x576 (height x width) with 16 b/p, i.e., unsigned 16-bit integer for each pixel
This is what I have been able to come up with so far:
import struct
import numpy as np
fileName = "filename.bin"
with open(fileName, mode='rb') as file:
fileContent = file.read()
a = struct.unpack("I" * ((len(fileContent)) // 4), fileContent)
a = np.reshape(a, (560,576))
However I get the error
cannot reshape array of size 161280 into shape (560,576)
161280 is exactly half of 560 x 576 = 322560
. I would like to understand what I am doing wrong and how to read the binary file and reshape in the required form.
Answers:
You are using ‘I’ for the format which is 32 bit unsigned instead of ‘H’ which is 16 bit unsigned.
Do this
a = struct.unpack("H" * ((len(fileContent)) // 2), fileContent)
I must read a binary file in Python, and store its content in an array. The information I have on this file is that
filename.bin is of size 560x576 (height x width) with 16 b/p, i.e., unsigned 16-bit integer for each pixel
This is what I have been able to come up with so far:
import struct
import numpy as np
fileName = "filename.bin"
with open(fileName, mode='rb') as file:
fileContent = file.read()
a = struct.unpack("I" * ((len(fileContent)) // 4), fileContent)
a = np.reshape(a, (560,576))
However I get the error
cannot reshape array of size 161280 into shape (560,576)
161280 is exactly half of 560 x 576 = 322560
. I would like to understand what I am doing wrong and how to read the binary file and reshape in the required form.
You are using ‘I’ for the format which is 32 bit unsigned instead of ‘H’ which is 16 bit unsigned.
Do this
a = struct.unpack("H" * ((len(fileContent)) // 2), fileContent)