![]() ![]() See the sammy's alternative answer below. Im learning Emgu.CV, I have successfully run the example, I prefer to read the image from byte array rather than direct from file, and also I prefer to save the result to byte array rather than to. don't forget to put at least one digit before d. The latter method works as long as you specify using %#d format, i.e. The reason it didn't work the first time is that there is a bug with CvCapture_Images where fullpath contains digits the first method fails. OR VideoCapture cap("c:/fullpath/%1d.png") png with alpha channel you can use the CVLOADIMAGEANYDEPTH (hope this is the right one) flag to load it as a CVxxC4 image (might be 16 bit too) and to use the original alpha values. How can I make VideoCapture work to read images named nicely? Answerīecause I don't have enough reputation I can't add this as an answer, so here it goes, you can do either: VideoCapture cap("c:/fullpath/1.png") use cv::cvtColor(src, src, CVBGR2BGRA) (and adjust later code to use a 4 channel matrix - cv::Vec4b instead of cv::Vec3b etc) if your input file is a. Latter one was not able to open the capture at all. Neither of them worked, the first one was able to read only 1.png but not the rest of the images. The output from imagemagick is shown below. You can see this because I can grab the alpha layer using imagemagick. Apparently the background of this image is transparent. I have tried: VideoCapture cap("c:/fullpath/1.png") Īnd VideoCapture cap("c:/fullpath/%d.png") Im using 2.3.1 and am having problems loading a PNG file. ![]() While browsing the source code I saw CvCapture_Images class which can read images one by one using a printf like pattern. Open up a new file, name it urltoimage. Very old answer: OpenCV does not support alpha channel, only masking. Then, use mixChannels() and/or split() to separate the alpha channel from others, and threshold on it, as explained below. Ive tried multiple approaches for the resizing of the images and all of them worked fine in terms of having a smaller image afterwards. Updated answer: Use CVLOADIMAGEUNCHANGED flag to load all four channels (including Alpha) from the image. I know it is not officially supported yet, but I would like to read images in a directory numbered as 1.png, 2.png. The first method we’ll explore is converting a URL to an image using the OpenCV, NumPy, and the urllib libraries. For my current WPF appliaction I have to down scale some ( objects which I load from PNG files (some of them with transparent background). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |