Hi I am trying to use opencv annotation tool for small pieces of high-resolution satellite images. each of my positive images is 14*14 or even smaller. these images are too small to mark the object when using annotation tool. I want to know if i can zoom the picture in the annotation window? Thanks!
no, unfortunately you cannot arbitrarily "zoom" into your image there.
the annotation tool has a scaling factor, but this is for the opposite case (making large images smaller)
however, as a crude hack, you could try to change the resizeFactor here from int to float, and recompile the app. this would allow you to use fractional scale factors, and call it like:
opencv_annotation -i=/data/testimages/ -a=/data/annotations.txt -m=1 -r=.25
(this would upscale your images by a factor of 1.0/0.25 = 4)
I wrote a small java fx programm for this(i needed resizing / zooming / scrolling): https://github.com/holger-prause/imag... No warranty.
Thanks for your answering, I am using python to finish the work and I could not find the file opencv_annotation.cpp. Could you please tell me how I can modify the file?
Or just click the link provided by berak - https://github.com/opencv/opencv/blob... It includes the line and also the path to the file
Thank you very much! I am really appreciated. Can I ask you another question? my code is image = cv2.imread('.tif',0) faceRect = cascade.detectMultiScale(image, scaleFactor=1.1, minNeighbors=1, minSize=(1,1)) But I got this error. error: (-211) The total matrix size does not fit to "size_t" type in function cv::setSize I am wondering if it's beacuse this tif image is too large? Do you have some suggestions? Thanks!
Asked: 2018-07-02 10:56:22 -0600
Seen: 2,808 times
Last updated: Jul 03 '18
