JP4 - Revision history

Oleg: /* Example file */

2018-02-10T01:00:56Z

Example file

← Older revision		Revision as of 01:00, 10 February 2018
Line 85:		Line 85:
	==<font color="blue">JP4</font>==		==<font color="blue">JP4</font>==
	===Example file===		===Example file===
	https://community.elphel.com/pictures/test.jp4		Download [https://community.elphel.com/pictures/test.jp4 sample]
	{\|		{\|
	\|[[File:Jp4 example rotated asjpeg.jpeg\|200px\|thumb\|JP4 opened as JPEG, rotated 90°]]		\|[[File:Jp4 example rotated asjpeg.jpeg\|200px\|thumb\|JP4 opened as JPEG, rotated 90°]]
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	\|}		\|}
	* If opened as a normal image the macro blocks will be displayed as 8x32.		* If opened as a normal image the macro blocks will be displayed as 8x32.

	===Online===		===Online===
	* [https://community.elphel.com/jp4viewer/?width=800&quality=1 Online JP4 viewer]		* [https://community.elphel.com/jp4viewer/?width=800&quality=1 Online JP4 viewer]

Oleg: /* JP4 */

2018-02-10T01:00:11Z

JP4

← Older revision		Revision as of 01:00, 10 February 2018
Line 84:		Line 84:

	==<font color="blue">JP4</font>==		==<font color="blue">JP4</font>==
			===Example file===
			https://community.elphel.com/pictures/test.jp4
	{\|		{\|
	\|[[File:Jp4 example rotated asjpeg.jpeg\|200px\|thumb\|JP4 opened as JPEG, rotated 90°]]		\|[[File:Jp4 example rotated asjpeg.jpeg\|200px\|thumb\|JP4 opened as JPEG, rotated 90°]]

Oleg: /* Demosaicing/debayering links */

2018-02-10T00:57:41Z

Demosaicing/debayering links

← Older revision		Revision as of 00:57, 10 February 2018
Line 367:		Line 367:

	Example files:		Example files:
	* [http://community.elphel.com/files/jp4/~~example_JP4~~.jpeg Example ~~JP4~~]		* [http://community.elphel.com/files/jp4/example_JP46.jpeg Example JP46]
	* [http://community.elphel.com/files/jp4/example_flipped.dng Example DNG]		* [http://community.elphel.com/files/jp4/example_flipped.dng Example DNG]
	* [http://community.elphel.com/files/jp4/example_converted.jpg Example JPG (converted)]		* [http://community.elphel.com/files/jp4/example_converted.jpg Example JPG (converted)]

Oleg: /* python */

2018-02-02T19:10:01Z

python

← Older revision		Revision as of 19:10, 2 February 2018
Line 109:		Line 109:
	====python====		====python====
	* 0.5s for 2592x1936 GRBG image		* 0.5s for 2592x1936 GRBG image
	<font size='2'>		<font size='1'>
	import numpy as np		import numpy as np
	from PIL import Image		from PIL import Image

Oleg: /* python */

2018-02-02T19:09:50Z

python

← Older revision		Revision as of 19:09, 2 February 2018
Line 109:		Line 109:
	====python====		====python====
	* 0.5s for 2592x1936 GRBG image		* 0.5s for 2592x1936 GRBG image
			<font size='2'>
	import numpy as np		import numpy as np
	from PIL import Image		from PIL import Image
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	# pixels ordered as in bayer pattern, this needs demosaicing		# pixels ordered as in bayer pattern, this needs demosaicing
	cv2.imwrite("result.png",I)		cv2.imwrite("result.png",I)
			</font>

	==<font color="blue">JP46</font>==		==<font color="blue">JP46</font>==

Oleg: /* python */

2018-02-02T19:09:14Z

python

← Older revision		Revision as of 19:09, 2 February 2018
Line 149:		Line 149:

	I = np.reshape(I,(H,W))		I = np.reshape(I,(H,W))
			# pixels ordered as in bayer pattern, this needs demosaicing
	cv2.imwrite("result.png",I)		cv2.imwrite("result.png",I)

Oleg: /* python */

2018-02-02T19:08:07Z

python

← Older revision		Revision as of 19:08, 2 February 2018
Line 149:		Line 149:

	I = np.reshape(I,(H,W))		I = np.reshape(I,(H,W))
			cv2.imwrite("result.png",I)

	==<font color="blue">JP46</font>==		==<font color="blue">JP46</font>==

Oleg: /* python */

2018-02-02T19:07:32Z

python

← Older revision		Revision as of 19:07, 2 February 2018
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	I[i,0:16,j:j+16] = block		I[i,0:16,j:j+16] = block

	I = np.reshape(I,(H,W))		I = np.reshape(I,(H,W))

	==<font color="blue">JP46</font>==		==<font color="blue">JP46</font>==

Oleg: /* python */

2018-02-02T19:06:56Z

python

← Older revision		Revision as of 19:06, 2 February 2018
Line 108:		Line 108:

	====python====		====python====
	* 0.5s for 2592x1936 image		* 0.5s for 2592x1936 GRBG image

			import numpy as np
			from PIL import Image
			import scipy.misc

	# first open image in grayscale		# first open image in grayscale
			I = scipy.misc.imread(filename, flatten=False, mode='L')

			H,W = I.shape

	# 16x16 block		# 16x16 block
	block = np.zeros((16,16))		block = np.zeros((16,16))

Oleg: /* python */

2018-02-02T19:04:10Z

python

← Older revision		Revision as of 19:04, 2 February 2018
Line 108:		Line 108:

	====python====		====python====
	* ~~very slow~~		* 0.5s for 2592x1936 image
	~~import numpy as~~ np
	~~from PIL import Image~~		# first open image in grayscale
	~~import scipy~~.~~misc~~
	~~...~~		# 16x16 block
	~~# in JP4 format the 16x16 block is 8x32~~ (~~GRBG~~)		block = np.zeros((16,16))
	# ~~the 1st line of 8x32 blocks is the left half of the image~~		# 16xW
	# ~~the 2nd line of 8x32 blocks is the right half~~		stripe = np.zeros((16,W))

	~~# vertical step = 16px~~		I = np.reshape(I,(H/16,16,W))
	for y in range(0~~,self~~.~~h,16~~):
	for x in range(0,~~self.w~~,16):		# print(I.shape)
			# (1936, 2592) -> (121, 16, 2592)
	~~bx = x~~ if x<~~self.w~~/2 ~~else x-self.w/~~2
	by = ~~y if x<self.w~~/2 ~~else y+8~~		for i in range(I.shape[0]):
			# stripe 16xW
	~~block8x8_gr = self.px~~[by:~~by+8~~,~~2bx+~~0 :2bx+ 8]		stripe = np.copy(I[i])
	~~block8x8_r~~ = ~~self.px~~[by:by+8,~~2bx~~+8 :~~2bx~~+16]		for j in range(0,W,16):
	~~block8x8_b = self.px~~[by:~~by+8~~,~~2bx+16~~:2bx+24]		if j<W/2:
	~~block8x8_gb~~ = ~~self.px~~[by:by+8,~~2bx~~+24:~~2bx~~+32]		k = 0
			l = 2*j
	~~for dy in range(8)~~:		else:
	~~for dx in range(8)~~:		k = 8
	~~#OpenCV uses BGR format~~		l = 2*(j-W/2)
	~~output[y+~~2dy+0~~,x+~~2dx+0]=[0,~~block8x8_gr[dy,dx][0],0]~~
	~~output[y~~+~~2dy~~+~~0,x~~+~~2dx+1]=[0,0,block8x8_r[dy,dx][0]~~]		# gr r b gb
	~~output~~[y+2dy+1~~,x+~~2dx+0]=[~~block8x8_b[dy~~,~~dx][0],0,0]~~		block[0::2,0::2] = stripe[k:k+8,l+ 0:l+ 0+8]
	~~output[y~~+~~2dy~~+~~1,x~~+~~2dx+1~~]=[0,~~block8x8_gb[dy,dx][~~0],0]		block[0::2,1::2] = stripe[k:k+8,l+ 8:l+ 8+8]
	...		block[1::2,0::2] = stripe[k:k+8,l+16:l+16+8]
			block[1::2,1::2] = stripe[k:k+8,l+24:l+24+8]

			I[i,0:16,j:j+16] = block

			I = np.reshape(I,(H,W))

	==<font color="blue">JP46</font>==		==<font color="blue">JP46</font>==