def pack(pqdict):
"""Pack a pixel quality dictionary into a 16-bit pixel quality value.
Arguments:
pqdict: pixel quality dictionary
Returns:
Packed pixel quality value (usually a 16-bit integer.)
"""
return sum((v << bits.lowest_set(PQ_BITMASKS[k])) for k,v in pqdict.iteritems())
def unpack(pqvalue):
"""Unpack a 16-bit (integer) pixel quality value.
Arguments:
pqvalue: pixel quality value (usually a 16-bit integer)
Returns:
Dictionary containing unpacked values for each pixel quality metric.
"""
return {k : ((pqvalue & v) >> bits.lowest_set(v)) for k,v in PQ_BITMASKS.iteritems()}
def pack(pqdict):
"""Pack a pixel quality dictionary into a 16-bit pixel quality value.
Arguments:
pqdict: pixel quality dictionary
Returns:
Packed pixel quality value (usually a 16-bit integer.)
"""
return sum(
(v << bits.lowest_set(PQ_BITMASKS[k])) for k, v in pqdict.iteritems())
def unpack(pqvalue):
"""Unpack a 16-bit (integer) pixel quality value.
Arguments:
pqvalue: pixel quality value (usually a 16-bit integer)
Returns:
Dictionary containing unpacked values for each pixel quality metric.
"""
return {
k: ((pqvalue & v) >> bits.lowest_set(v))
for k, v in PQ_BITMASKS.iteritems()
}
def test_bitmasks(self):
m = sum([v for v in PQ_BITMASKS.itervalues()])
self.assertEqual(bits.lowest_set(m), 0)
self.assertEqual(bits.length(m), 16)
self.assertEqual(m, 0b1111111111111111)
print ' Bitmasks total (all ones): ', bin(m), m
def test_bitmasks(self):
m = sum([v for v in PQ_BITMASKS.itervalues()])
self.assertEqual(bits.lowest_set(m), 0)
self.assertEqual(bits.length(m), 16)
self.assertEqual(m, 0b1111111111111111)
def test_bitmasks(self):
m = sum([v for v in PQ_BITMASKS.itervalues()])
self.assertEqual(bits.lowest_set(m), 0)
self.assertEqual(bits.length(m), 16)
self.assertEqual(m, 0b1111111111111111)
def test_bitmasks(self):
m = sum([v for v in PQ_BITMASKS.itervalues()])
self.assertEqual(bits.lowest_set(m), 0)
self.assertEqual(bits.length(m), 16)
self.assertEqual(m, 0b1111111111111111)
print ' Bitmasks total (all ones): ', bin(m), m