{"id":3181,"url":"https://patchwork.libcamera.org/api/patches/3181/?format=json","web_url":"https://patchwork.libcamera.org/patch/3181/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20200318205034.949531-4-jacopo@jmondi.org>","date":"2020-03-18T20:50:26","name":"[libcamera-devel,v7,03/11] dt-bindings: video-interface: Replace 'rotation' description","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"595c58ad396d3b0aa79da501e135a8b3aa253fa8","submitter":{"id":3,"url":"https://patchwork.libcamera.org/api/people/3/?format=json","name":"Jacopo Mondi","email":"jacopo@jmondi.org"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/3181/mbox/","series":[{"id":736,"url":"https://patchwork.libcamera.org/api/series/736/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=736","date":"2020-03-18T20:50:23","name":"media: Report camera sensor properties","version":7,"mbox":"https://patchwork.libcamera.org/series/736/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/3181/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/3181/checks/","tags":{},"headers":{"Return-Path":"","Received":["from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net\n\t[217.70.183.200])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 84FE160415\n\tfor ;\n\tWed, 18 Mar 2020 21:47:57 +0100 (CET)","from localhost.localdomain (2-224-242-101.ip172.fastwebnet.it\n\t[2.224.242.101]) (Authenticated sender: jacopo@jmondi.org)\n\tby relay7-d.mail.gandi.net (Postfix) with ESMTPSA id 9E95E20004;\n\tWed, 18 Mar 2020 20:47:54 +0000 (UTC)"],"X-Originating-IP":"2.224.242.101","From":"Jacopo Mondi ","To":"Mauro Carvalho Chehab ,\n\tHans Verkuil ,\n\tSakari Ailus ,\n\tLaurent Pinchart , tfiga@google.com,\n\tpavel@ucw.cz","Cc":"Jacopo Mondi ,\n\tlinux-media@vger.kernel.org (open list:MEDIA INPUT INFRASTRUCTURE\n\t(V4L/DVB)), libcamera-devel@lists.libcamera.org, robh@kernel.org,\n\tdevicetree@vger.kernel.org,\n\tNiklas Soderlund ","Date":"Wed, 18 Mar 2020 21:50:26 +0100","Message-Id":"<20200318205034.949531-4-jacopo@jmondi.org>","X-Mailer":"git-send-email 2.25.1","In-Reply-To":"<20200318205034.949531-1-jacopo@jmondi.org>","References":"<20200318205034.949531-1-jacopo@jmondi.org>","MIME-Version":"1.0","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH v7 03/11] dt-bindings: video-interface:\n\tReplace 'rotation' description","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","X-List-Received-Date":"Wed, 18 Mar 2020 20:47:57 -0000"},"content":"Replace the 'rotation' property description by providing a definition\nrelative to the camera sensor pixel array coordinate system and the\ncaptured scene.\n\nSigned-off-by: Jacopo Mondi \nCo-developed-by: Laurent Pinchart \nCo-developed-by: Niklas Soderlund \n\n---\n .../bindings/media/video-interfaces.txt | 359 +++++++++++++++++-\n 1 file changed, 356 insertions(+), 3 deletions(-)\n\n--\n2.25.1","diff":"diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt\nindex 1211bdf80722..36e61d599f34 100644\n--- a/Documentation/devicetree/bindings/media/video-interfaces.txt\n+++ b/Documentation/devicetree/bindings/media/video-interfaces.txt\n@@ -85,9 +85,362 @@ Optional properties\n\n - lens-focus: A phandle to the node of the focus lens controller.\n\n-- rotation: The device, typically an image sensor, is not mounted upright,\n- but a number of degrees counter clockwise. Typical values are 0 and 180\n- (upside down).\n+- rotation: The camera rotation is expressed as the angular difference in\n+ degrees between two reference systems, one relative to the camera module, and\n+ one defined on the external world scene to be captured when projected on the\n+ image sensor pixel array.\n+\n+ A camera sensor has a 2-dimensional reference system 'Rc' defined by\n+ its pixel array read-out order. The origin is set to the first pixel\n+ being read out, the X-axis points along the column read-out direction\n+ towards the last columns, and the Y-axis along the row read-out\n+ direction towards the last row.\n+\n+ A typical example for a sensor with a 2592x1944 pixel array matrix\n+ observed from the front is\n+\n+ 2591 X-axis 0\n+ <------------------------+ 0\n+ .......... ... ..........!\n+ .......... ... ..........! Y-axis\n+ ... !\n+ .......... ... ..........!\n+ .......... ... ..........! 1943\n+ V\n+\n+ The external world scene reference system 'Rs' is a 2-dimensional\n+ reference system on the focal plane of the camera module. The origin is\n+ placed on the top-left corner of the visible scene, the X-axis points\n+ towards the right, and the Y-axis points towards the bottom of the\n+ scene. The top, bottom, left and right directions are intentionally not\n+ defined and depend on the environment in which the camera is used.\n+\n+ A typical example of a (very common) picture of a shark swimming from\n+ left to right, as seen from the camera, is\n+\n+ 0 X-axis\n+ 0 +------------------------------------->\n+ !\n+ !\n+ !\n+ ! |\\____)\\___\n+ ! ) _____ __`<\n+ ! |/ )/\n+ !\n+ !\n+ !\n+ V\n+ Y-axis\n+\n+ With the reference system 'Rs' placed on the camera focal plane.\n+\n+ ¸.·˙!\n+ ¸.·˙ !\n+ _ ¸.·˙ !\n+ +-/ \\-+¸.·˙ !\n+ | (o) | ! Camera focal plane\n+ +-----+˙·.¸ !\n+ ˙·.¸ !\n+ ˙·.¸ !\n+ ˙·.¸!\n+\n+ When projected on the sensor's pixel array, the image and the associated\n+ reference system 'Rs' are typically (but not always) inverted, due to\n+ the camera module's lens optical inversion effect.\n+\n+ Assuming the above represented scene of the swimming shark, the lens\n+ inversion projects the scene and its reference system onto the sensor\n+ pixel array, seen from the front of the camera sensor, as follow\n+\n+ Y-axis\n+ ^\n+ !\n+ !\n+ !\n+ ! |\\_____)\\__\n+ ! ) ____ ___.<\n+ ! |/ )/\n+ !\n+ !\n+ !\n+ 0 +------------------------------------->\n+ 0 X-axis\n+\n+ Note the shark being upside-down.\n+\n+ The resulting projected reference system is named 'Rp'.\n+\n+ The camera rotation property is then defined as the angular difference\n+ in the counter-clockwise direction between the camera reference system\n+ 'Rc' and the projected scene reference system 'Rp'. It is expressed in\n+ degrees as a number in the range [0, 360[.\n+\n+ Examples\n+\n+ 0 degrees camera rotation\n+\n+\n+ Y-Rp\n+ ^\n+ Y-Rc !\n+ ^ !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! 0 +------------------------------------->\n+ ! 0 X-Rp\n+ 0 +------------------------------------->\n+ 0 X-Rc\n+\n+\n+ X-Rc 0\n+ <------------------------------------+ 0\n+ X-Rp 0 !\n+ <------------------------------------+ 0 !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! V\n+ ! Y-Rc\n+ V\n+ Y-Rp\n+\n+ 90 degrees camera rotation\n+\n+ 0 Y-Rc\n+ 0 +-------------------->\n+ ! Y-Rp\n+ ! ^\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! 0 +------------------------------------->\n+ ! 0 X-Rp\n+ !\n+ !\n+ !\n+ !\n+ V\n+ X-Rc\n+\n+ 180 degrees camera rotation\n+\n+ 0\n+ <------------------------------------+ 0\n+ X-Rc !\n+ Y-Rp !\n+ ^ !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! V\n+ ! Y-Rc\n+ 0 +------------------------------------->\n+ 0 X-Rp\n+\n+ 270 degrees camera rotation\n+\n+ 0 Y-Rc\n+ 0 +-------------------->\n+ ! 0\n+ ! <-----------------------------------+ 0\n+ ! X-Rp !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! !\n+ ! V\n+ ! Y-Rp\n+ !\n+ !\n+ !\n+ !\n+ V\n+ X-Rc\n+\n+\n+ Example one - Webcam\n+\n+ A camera module installed on the user facing part of a laptop screen\n+ casing used for video calls. The captured images are meant to be\n+ displayed in landscape mode (width > height) on the laptop screen.\n+\n+ The camera is typically mounted upside-down to compensate the lens\n+ optical inversion effect.\n+\n+ Y-Rp\n+ Y-Rc ^\n+ ^ !\n+ ! !\n+ ! ! |\\_____)\\__\n+ ! ! ) ____ ___.<\n+ ! ! |/ )/\n+ ! !\n+ ! !\n+ ! !\n+ ! 0 +------------------------------------->\n+ ! 0 X-Rp\n+ 0 +------------------------------------->\n+ 0 X-Rc\n+\n+ The two reference systems are aligned, the resulting camera rotation is\n+ 0 degrees, no rotation correction needs to be applied to the resulting\n+ image once captured to memory buffers to correctly display it to users.\n+\n+ +--------------------------------------+\n+ ! !\n+ ! !\n+ ! !\n+ ! |\\____)\\___ !\n+ ! ) _____ __`< !\n+ ! |/ )/ !\n+ ! !\n+ ! !\n+ ! !\n+ +--------------------------------------+\n+\n+ If the camera sensor is not mounted upside-down to compensate for the\n+ lens optical inversion, the two reference systems will not be aligned,\n+ with 'Rp' being rotated 180 degrees relatively to 'Rc'.\n+\n+\n+ X-Rc 0\n+ <------------------------------------+ 0\n+ !\n+ Y-Rp !\n+ ^ !\n+ ! !\n+ ! |\\_____)\\__ !\n+ ! ) ____ ___.< !\n+ ! |/ )/ !\n+ ! !\n+ ! !\n+ ! V\n+ ! Y-Rc\n+ 0 +------------------------------------->\n+ 0 X-Rp\n+\n+ The image once captured to memory will then be rotated by 180 degrees\n+\n+ +--------------------------------------+\n+ ! !\n+ ! !\n+ ! !\n+ ! __/(_____/| !\n+ ! >.___ ____ ( !\n+ ! \\( \\| !\n+ ! !\n+ ! !\n+ ! !\n+ +--------------------------------------+\n+\n+ A software rotation correction of 180 degrees should be applied to\n+ correctly display the image.\n+\n+ +--------------------------------------+\n+ ! !\n+ ! !\n+ ! !\n+ ! |\\____)\\___ !\n+ ! ) _____ __`< !\n+ ! |/ )/ !\n+ ! !\n+ ! !\n+ ! !\n+ +--------------------------------------+\n+\n+ Example two - Phone camera\n+\n+ A camera installed on the back side of a mobile device facing away from\n+ the user. The captured images are meant to be displayed in portrait mode\n+ (height > width) to match the device screen orientation and the device\n+ usage orientation used when taking the picture.\n+\n+ The camera sensor is typically mounted with its pixel array longer side\n+ aligned to the device longer side, upside-down mounted to compensate for\n+ the lens optical inversion effect.\n+\n+ 0 Y-Rc\n+ 0 +-------------------->\n+ ! Y-Rp\n+ ! ^\n+ ! !\n+ ! !\n+ ! !\n+ ! ! |\\_____)\\__\n+ ! ! ) ____ ___.<\n+ ! ! |/ )/\n+ ! !\n+ ! !\n+ ! !\n+ ! 0 +------------------------------------->\n+ ! 0 X-Rp\n+ !\n+ !\n+ !\n+ !\n+ V\n+ X-Rc\n+\n+ The two reference systems are not aligned and the 'Rp' reference\n+ system is rotated by 90 degrees in the counter-clockwise direction\n+ relatively to the 'Rc' reference system.\n+\n+ The image once captured to memory will be rotated.\n+\n+ +-------------------------------------+\n+ | _ _ |\n+ | \\ / |\n+ | | | |\n+ | | | |\n+ | | > |\n+ | < | |\n+ | | | |\n+ | . |\n+ | V |\n+ +-------------------------------------+\n+\n+ A correction of 90 degrees in counter-clockwise direction has to be\n+ applied to correctly display the image in portrait mode on the device\n+ screen.\n+\n+ +--------------------+\n+ | |\n+ | |\n+ | |\n+ | |\n+ | |\n+ | |\n+ | |\\____)\\___ |\n+ | ) _____ __`< |\n+ | |/ )/ |\n+ | |\n+ | |\n+ | |\n+ | |\n+ | |\n+ +--------------------+\n\n - location: The mount location of a device (typically an image sensor or a flash\n LED) expressed as a position relative to the usage orientation of the system\n","prefixes":["libcamera-devel","v7","03/11"]}