Questions - OpenCV Q&A Forum

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2020-09-24 05:42:44 -0600 Den

Opencv.js - findPerspective returns wrong corners coordinates

399

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2020-09-24 07:37:13 -0600 Maxime

Why imread is reallocating data buffer

12k

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1

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2020-09-24 10:44:53 -0600 berak

how to solve (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'

1k

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2020-09-24 11:27:38 -0600 Maxime

Imread with preallocated data pointer (cuda unified memory) is reallocating with the exact same size, but shouldn't [closed]

294

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2020-09-24 13:01:09 -0600 Mark S

ArUco Thresholding Window Size

2k

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1

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no

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2020-09-24 14:05:44 -0600 sturkmen

Detect objects even though they touch the border of an image

opencv#python

3k

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1

answer

1

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2020-09-24 15:46:36 -0600 archimedium

warpPerspective() to a different origin [SOLVED]

geometric-transform

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2020-09-25 02:54:32 -0600 wil-den

peculiar docker problem

565

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2020-09-25 05:21:10 -0600 Shassk

Determine new coordinates of pixel after calibration + remap

calibration

227

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2020-09-25 05:34:38 -0600 Supreeth Kumar Y P

How to update UMat when Mat is updated?

1k

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3

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2020-09-25 05:36:01 -0600 Shassk

How to separate objects wich have the same color

objectdetection

1k

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1

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-1

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2020-09-25 07:49:08 -0600 Supreeth Kumar Y P

Disable file system cache during imwrite [closed]

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2020-09-25 08:36:25 -0600 Pawan29

What is the length of the tape/strip from the image?

300

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2020-09-25 09:05:59 -0600 jast_r

Preform separation and image segmentation

489

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2020-09-25 09:20:12 -0600 Leonardo_ads

imencode not working with ".jpg" extension (Access violation reading location)

imencode

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2020-09-25 11:30:43 -0600 Vishwanath Garrepalli

Hi I have started working in ML and CV field recently. I want to participate in GSoC 2021. Can someone please guide and suggest me what I should do for contributing.

329

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2020-09-25 16:54:52 -0600 queisser

Calibration grid larger than FOV - which method?

calibration

13k

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1

answer

3

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2020-09-25 19:46:18 -0600 tjwmmd2

Fastest way to convert BGR <-> RGB! Aka: Do NOT use Numpy magic "tricks".

1k

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1

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no

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2020-09-26 17:43:25 -0600 yoshihiko

How to convert stereo camera distances, pixels to mm [closed]

stereocamera

393

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1

answer

1

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2020-09-26 19:26:00 -0600 greggaz

Cannot decode server-sent uchar vector on client side: Empty Mat results.

1k

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2

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2

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2020-09-27 05:39:55 -0600 sturkmen

try to read different frame by videocapture but failed

videocapture

754

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1

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no

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2020-09-27 09:11:36 -0600 Chris

How to color the pixels in an image depending on whether they are inside/outside a zone/circle?

159

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2020-09-27 20:00:52 -0600 squenix008

Callback parameters not being updated

setMouseCallback

573

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2020-09-28 01:35:24 -0600 Deebo

Visual Studio 2019 build error "link.exe" could not be run

VS2019

242

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1

answer

1

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2020-09-28 03:09:56 -0600 berak

Why is a contour from cv2.findContours() in a shape like [N,1,2]?

86

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2020-09-28 05:18:41 -0600 image data

I wanted to export my satellite image to a particular zoom level

Satellite

437

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no

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2020-09-28 06:59:48 -0600 Scheolin

Camera Center from rvecs and tvecs

opencv

1k

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no

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no

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2020-09-28 07:23:22 -0600 sarslan

Using Gstreamer Pipeline in openCV, Why my pipeline works when I add videoconvert element before appsink ?

1k

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no

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no

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2020-09-28 11:52:06 -0600 kebwi

VFR: obtain FR/duration/timestamp of a given frame?

282

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no

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2020-09-28 20:20:07 -0600 nabatta

29,830 questions

Opencv.js - findPerspective returns wrong corners coordinates

Why imread is reallocating data buffer

how to solve (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'

Imread with preallocated data pointer (cuda unified memory) is reallocating with the exact same size, but shouldn't [closed]

ArUco Thresholding Window Size

Detect objects even though they touch the border of an image

warpPerspective() to a different origin [SOLVED]

peculiar docker problem

Determine new coordinates of pixel after calibration + remap

How to update UMat when Mat is updated?

How to separate objects wich have the same color

Disable file system cache during imwrite [closed]

What is the length of the tape/strip from the image?

Preform separation and image segmentation

imencode not working with ".jpg" extension (Access violation reading location)

Hi I have started working in ML and CV field recently. I want to participate in GSoC 2021. Can someone please guide and suggest me what I should do for contributing.

Calibration grid larger than FOV - which method?

Fastest way to convert BGR <-> RGB! Aka: Do NOT use Numpy magic "tricks".

How to convert stereo camera distances, pixels to mm [closed]

Cannot decode server-sent uchar vector on client side: Empty Mat results.

try to read different frame by videocapture but failed

How to color the pixels in an image depending on whether they are inside/outside a zone/circle?

Callback parameters not being updated

Visual Studio 2019 build error "link.exe" could not be run

Why is a contour from cv2.findContours() in a shape like [N,1,2]?

I wanted to export my satellite image to a particular zoom level

Camera Center from rvecs and tvecs

Using Gstreamer Pipeline in openCV, Why my pipeline works when I add videoconvert element before appsink ?

VFR: obtain FR/duration/timestamp of a given frame?

Drone Localization with IR Beacons?

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