def __write_openjp2(img_array, filename, offset, comp_prec=8, verbose=False, **kwargs):
cparams = __populate_cparams(**kwargs)
comptparms = __populate_comptparms(img_array, comp_prec, cparams)
with ExitStack() as stack:
image = opj2.image_create(comptparms, opj2.CLRSPC_GRAY)
stack.callback(opj2.image_destroy, image)
__populate_image_struct(image, img_array, comp_prec, cparams)
codec = opj2.create_compress(cparams.codec_fmt)
stack.callback(opj2.destroy_codec, codec)
info_handler = _INFO_CALLBACK if verbose else None
opj2.set_info_handler(codec, info_handler)
opj2.set_warning_handler(codec, _WARNING_CALLBACK)
opj2.set_error_handler(codec, _ERROR_CALLBACK)
opj2.setup_encoder(codec, cparams, image)
strm = opj2.stream_create_default_file_stream(filename, False)
stack.callback(opj2.stream_destroy, strm)
stream_seek(strm, offset)
opj2.start_compress(codec, image, strm)
opj2.encode(codec, strm)
opj2.end_compress(codec, strm)
def tile_encoder(**kwargs):
"""Fixture used by many tests."""
num_tiles = ((kwargs['image_width'] / kwargs['tile_width']) *
(kwargs['image_height'] / kwargs['tile_height']))
tile_size = ((kwargs['tile_width'] * kwargs['tile_height']) *
(kwargs['num_comps'] * kwargs['comp_prec'] / 8))
data = np.random.random((kwargs['tile_height'],
kwargs['tile_width'],
kwargs['num_comps']))
data = (data * 255).astype(np.uint8)
l_param = openjp2.set_default_encoder_parameters()
l_param.tcp_numlayers = 1
l_param.cp_fixed_quality = 1
l_param.tcp_distoratio[0] = 20
# position of the tile grid aligned with the image
l_param.cp_tx0 = 0
l_param.cp_ty0 = 0
# tile size, we are using tile based encoding
l_param.tile_size_on = 1
l_param.cp_tdx = kwargs['tile_width']
l_param.cp_tdy = kwargs['tile_height']
# use irreversible encoding
l_param.irreversible = kwargs['irreversible']
l_param.numresolution = 6
l_param.prog_order = glymur.core.LRCP
l_params = (openjp2.ImageComptParmType * kwargs['num_comps'])()
for j in range(kwargs['num_comps']):
l_params[j].dx = 1
l_params[j].dy = 1
l_params[j].h = kwargs['image_height']
l_params[j].w = kwargs['image_width']
l_params[j].sgnd = 0
l_params[j].prec = kwargs['comp_prec']
l_params[j].x0 = 0
l_params[j].y0 = 0
codec = openjp2.create_compress(kwargs['codec'])
openjp2.set_info_handler(codec, None)
openjp2.set_warning_handler(codec, None)
openjp2.set_error_handler(codec, None)
cspace = openjp2.CLRSPC_SRGB
l_image = openjp2.image_tile_create(l_params, cspace)
l_image.contents.x0 = 0
l_image.contents.y0 = 0
l_image.contents.x1 = kwargs['image_width']
l_image.contents.y1 = kwargs['image_height']
l_image.contents.color_space = openjp2.CLRSPC_SRGB
openjp2.setup_encoder(codec, l_param, l_image)
stream = openjp2.stream_create_default_file_stream(kwargs['filename'],
False)
openjp2.start_compress(codec, l_image, stream)
for j in np.arange(num_tiles):
openjp2.write_tile(codec, j, data, tile_size, stream)
openjp2.end_compress(codec, stream)
openjp2.stream_destroy(stream)
openjp2.destroy_codec(codec)
openjp2.image_destroy(l_image)
def tile_encoder(**kwargs):
"""Fixture used by many tests."""
num_tiles = ((kwargs['image_width'] / kwargs['tile_width']) *
(kwargs['image_height'] / kwargs['tile_height']))
tile_size = ((kwargs['tile_width'] * kwargs['tile_height']) *
(kwargs['num_comps'] * kwargs['comp_prec'] / 8))
data = np.random.random(
(kwargs['tile_height'], kwargs['tile_width'], kwargs['num_comps']))
data = (data * 255).astype(np.uint8)
l_param = openjp2.set_default_encoder_parameters()
l_param.tcp_numlayers = 1
l_param.cp_fixed_quality = 1
l_param.tcp_distoratio[0] = 20
# position of the tile grid aligned with the image
l_param.cp_tx0 = 0
l_param.cp_ty0 = 0
# tile size, we are using tile based encoding
l_param.tile_size_on = 1
l_param.cp_tdx = kwargs['tile_width']
l_param.cp_tdy = kwargs['tile_height']
# use irreversible encoding
l_param.irreversible = kwargs['irreversible']
l_param.numresolution = 6
l_param.prog_order = glymur.core.LRCP
l_params = (openjp2.ImageComptParmType * kwargs['num_comps'])()
for j in range(kwargs['num_comps']):
l_params[j].dx = 1
l_params[j].dy = 1
l_params[j].h = kwargs['image_height']
l_params[j].w = kwargs['image_width']
l_params[j].sgnd = 0
l_params[j].prec = kwargs['comp_prec']
l_params[j].x0 = 0
l_params[j].y0 = 0
codec = openjp2.create_compress(kwargs['codec'])
openjp2.set_info_handler(codec, None)
openjp2.set_warning_handler(codec, None)
openjp2.set_error_handler(codec, None)
cspace = openjp2.CLRSPC_SRGB
l_image = openjp2.image_tile_create(l_params, cspace)
l_image.contents.x0 = 0
l_image.contents.y0 = 0
l_image.contents.x1 = kwargs['image_width']
l_image.contents.y1 = kwargs['image_height']
l_image.contents.color_space = openjp2.CLRSPC_SRGB
openjp2.setup_encoder(codec, l_param, l_image)
stream = openjp2.stream_create_default_file_stream(kwargs['filename'],
False)
openjp2.start_compress(codec, l_image, stream)
for j in np.arange(num_tiles):
openjp2.write_tile(codec, j, data, tile_size, stream)
openjp2.end_compress(codec, stream)
openjp2.stream_destroy(stream)
openjp2.destroy_codec(codec)
openjp2.image_destroy(l_image)
def test_write_tiles_3D(self):
"""
Test writing tiles for an RGB image.
"""
img = fixtures.skimage.data.astronaut()
image_height, image_width, num_comps = img.shape
tile_height, tile_width = 256, 256
comp_prec = 8
irreversible = False
cblockh_init, cblockw_init = 64, 64
numresolution = 6
cparams = openjp2.set_default_encoder_parameters()
outfile = str(self.temp_j2k_filename).encode()
num_pad_bytes = openjp2.PATH_LEN - len(outfile)
outfile += b'0' * num_pad_bytes
cparams.outfile = outfile
# not from openjpeg test file
cparams.cp_disto_alloc = 1
cparams.tile_size_on = openjp2.TRUE
cparams.cp_tdx = tile_width
cparams.cp_tdy = tile_height
cparams.cblockw_init, cparams.cblockh_init = cblockw_init, cblockh_init
# not from openjpeg test file
cparams.mode = 0
cparams.irreversible = 1 if irreversible else 0
cparams.numresolution = numresolution
cparams.prog_order = glymur.core.PROGRESSION_ORDER['LRCP']
cparams.tcp_mct = 1
cparams.tcp_numlayers = 1
cparams.tcp_rates[0] = 0
cparams.tcp_distoratio[0] = 0
# comptparms == l_params
comptparms = (openjp2.ImageComptParmType * num_comps)()
for j in range(num_comps):
comptparms[j].dx = 1
comptparms[j].dy = 1
comptparms[j].w = image_width
comptparms[j].h = image_height
comptparms[j].x0 = 0
comptparms[j].y0 = 0
comptparms[j].prec = comp_prec
comptparms[j].bpp = comp_prec
comptparms[j].sgnd = 0
with ExitStack() as stack:
codec = openjp2.create_compress(openjp2.CODEC_J2K)
stack.callback(openjp2.destroy_codec, codec)
info_handler = _INFO_CALLBACK
openjp2.set_info_handler(codec, info_handler)
openjp2.set_warning_handler(codec, _WARNING_CALLBACK)
openjp2.set_error_handler(codec, _ERROR_CALLBACK)
image = openjp2.image_tile_create(comptparms, openjp2.CLRSPC_SRGB)
stack.callback(openjp2.image_destroy, image)
image.contents.x0, image.contents.y0 = 0, 0
image.contents.x1, image.contents.y1 = image_width, image_height
image.contents.color_space = openjp2.CLRSPC_SRGB
openjp2.setup_encoder(codec, cparams, image)
filename = str(self.temp_j2k_filename)
strm = openjp2.stream_create_default_file_stream(filename, False)
stack.callback(openjp2.stream_destroy, strm)
openjp2.start_compress(codec, image, strm)
# have to change the memory layout of 3D images in order to use
# opj_write_tile
openjp2.write_tile(
codec, 0, _set_planar_pixel_order(img[0:256, 0:256, :]), strm
)
openjp2.write_tile(
codec, 1, _set_planar_pixel_order(img[0:256, 256:512, :]), strm
)
openjp2.write_tile(
codec, 2, _set_planar_pixel_order(img[256:512, 0:256, :]), strm
)
openjp2.write_tile(
codec, 3, _set_planar_pixel_order(img[256:512, 256:512, :]),
strm
)
openjp2.end_compress(codec, strm)
def test_tile_write_moon(self):
"""
Test writing tiles for a 2D image.
"""
img = fixtures.skimage.data.moon()
num_comps = 1
image_height, image_width = img.shape
tile_height, tile_width = 256, 256
comp_prec = 8
irreversible = True
cblockh_init, cblockw_init = 64, 64
numresolution = 6
cparams = openjp2.set_default_encoder_parameters()
cparams.tile_size_on = openjp2.TRUE
cparams.cp_tdx = tile_width
cparams.cp_tdy = tile_height
cparams.cblockw_init, cparams.cblockh_init = cblockw_init, cblockh_init
cparams.irreversible = 1 if irreversible else 0
cparams.numresolution = numresolution
cparams.prog_order = glymur.core.PROGRESSION_ORDER['LRCP']
# greyscale so no mct
cparams.tcp_mct = 0
# comptparms == l_params
comptparms = (openjp2.ImageComptParmType * num_comps)()
for j in range(num_comps):
comptparms[j].dx = 1
comptparms[j].dy = 1
comptparms[j].w = tile_width
comptparms[j].h = tile_height
comptparms[j].x0 = 0
comptparms[j].y0 = 0
comptparms[j].prec = comp_prec
comptparms[j].bpp = comp_prec
comptparms[j].sgnd = 0
with ExitStack() as stack:
codec = openjp2.create_compress(openjp2.CODEC_J2K)
stack.callback(openjp2.destroy_codec, codec)
info_handler = _INFO_CALLBACK
openjp2.set_info_handler(codec, info_handler)
openjp2.set_warning_handler(codec, _WARNING_CALLBACK)
openjp2.set_error_handler(codec, _ERROR_CALLBACK)
# l_params == comptparms
# l_image == tile
image = openjp2.image_tile_create(comptparms, openjp2.CLRSPC_GRAY)
stack.callback(openjp2.image_destroy, image)
image.contents.x0, image.contents.y0 = 0, 0
image.contents.x1, image.contents.y1 = image_width, image_height
image.contents.color_space = openjp2.CLRSPC_GRAY
openjp2.setup_encoder(codec, cparams, image)
filename = str(self.temp_j2k_filename)
strm = openjp2.stream_create_default_file_stream(filename, False)
stack.callback(openjp2.stream_destroy, strm)
openjp2.start_compress(codec, image, strm)
openjp2.write_tile(codec, 0, img[0:256, 0:256].copy(), strm)
openjp2.write_tile(codec, 1, img[0:256, 256:512].copy(), strm)
openjp2.write_tile(codec, 2, img[256:512, 0:256].copy(), strm)
openjp2.write_tile(codec, 3, img[256:512, 256:512].copy(), strm)
openjp2.end_compress(codec, strm)