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2019-01-31 09:02:09 -0600
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2019-01-29 14:29:47 -0600
| marked best answer | imshow() Python/macOS not showing the image I'm literally just starting out, but already stuck .. I'm trying to get an image to display, but imshow() only opens an empty window. I don't get any errors, and the program doesn't hang (pressing a key closes the window just fine) - it's just that there is no image in the window. I know that the image is loaded correctly, because I'm printing out the arrays and image data looks right. Also I can see that the window always has the correct _measurements_ for whichever image file I'm picking. import numpy as np
import cv2
img = cv2.imread('butterfly.jpg', 0)
print(img)
cv2.imshow('Butterfly', img)
cv2.waitKey(0)
cv2.destroyAllWindows()
Things I have tried (to no avail): - using an absolute path instead
- adding
cv2.startWindowThread(); cv2.namedWindow('Butterfly') before the imshow() command - reading lots of posts with similar problems
I'm using Python3.6, on macOS (Mojave), cv2 v.4.0.1 Any ideas what I might be doing wrong? -- Edit --
print(cv2.getBuildInformation()) gives me this: General configuration for OpenCV 4.0.1 =====================================
Version control: unknown
Extra modules:
Location (extra): /tmp/opencv-20190105-31032-o160to/opencv-4.0.1/opencv_contrib/modules
Version control (extra): unknown
Platform:
Timestamp: 2019-01-05T01:41:15Z
Host: Darwin 18.2.0 x86_64
CMake: 3.13.2
CMake generator: Unix Makefiles
CMake build tool: /usr/local/Homebrew/Library/Homebrew/shims/mac/super/gmake
Configuration: Release
CPU/HW features:
Baseline: SSE SSE2 SSE3 SSSE3 SSE4_1 POPCNT SSE4_2
requested: DETECT
disabled: SSE4_1 SSE4_2 AVX AVX2
Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
SSE4_1 (0 files): +
SSE4_2 (0 files): +
FP16 (0 files): + FP16 AVX
AVX (4 files): + AVX
AVX2 (11 files): + FP16 FMA3 AVX AVX2
AVX512_SKX (1 files): + FP16 FMA3 AVX AVX2 AVX_512F AVX512_SKX
C/C++:
Built as dynamic libs?: YES
C++ Compiler: /usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang++ (ver 10.0.0.10001145)
C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -DNDEBUG -DNDEBUG
C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
C Compiler: /usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang
C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -DNDEBUG -DNDEBUG
C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden ... (more) |
2019-01-29 14:29:45 -0600
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2019-01-29 14:05:30 -0600
| answered a question | imshow() Python/macOS not showing the image Update: So it turned out that it was indeed an installation problem. I managed to uninstall Python 3.6, and then with br |
2019-01-24 07:57:55 -0600
| commented question | imshow() Python/macOS not showing the image Ok, thanks so much for helping me rule out any mistakes in my openCV code, and giving me another idea what to try! I'll |
2019-01-24 07:44:03 -0600
| commented question | imshow() Python/macOS not showing the image Er, yes, I did have some weird issues during installation ... I installed with 'brew install opencv' and it got installe |
2019-01-24 07:21:53 -0600
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2019-01-24 07:21:53 -0600
| edited question | imshow() Python/macOS not showing the image imshow() Python/macOS not showing the image
I'm literally just starting out, but already stuck .. I'm trying to get an i |
2019-01-24 07:14:36 -0600
| commented question | imshow() Python/macOS not showing the image got the cv2.getBuildInformation()) ... but it's a lot ... is there a better way than pasting the whole lot in a comment |
2019-01-24 07:14:25 -0600
| commented question | imshow() Python/macOS not showing the image got the cv2.getBuildInformation()) ... but it's a lot ... is there a better way than pasting the whole lot in a comment |
2019-01-24 07:08:08 -0600
| commented question | imshow() Python/macOS not showing the image got the cv2.getBuildInformation()) ... but it's a lot ... is there a better way than pasting the whole lot in a comment |
2019-01-24 07:04:04 -0600
| commented question | imshow() Python/macOS not showing the image hm, that doesn't make any difference either ... :-(
Sorry - overlooked the C++ question - idk ...
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2019-01-24 07:02:36 -0600
| commented question | imshow() Python/macOS not showing the image hm, that doesn't make any difference either ... :-(
Sorry - overlooked the C++ question - idk ...
But the print stateme |
2019-01-24 06:56:32 -0600
| commented question | imshow() Python/macOS not showing the image hm, that doesn't make any difference either ... :-(
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2019-01-24 06:23:34 -0600
| commented question | imshow() Python/macOS not showing the image Thanks for looking into this! But no, it's not None: print(img) gives me the correct array, and I can even do cv2.imwrit |
2019-01-23 17:49:07 -0600
| asked a question | imshow() Python/macOS not showing the image imshow() Python/macOS not showing the image
I'm literally just starting out, but already stuck .. I'm trying to get an i |