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问题 Say I have the following binary image created from the output of cv::watershed() : Now I want to find and fill the contours, so I can separate the corresponding objects from the background in the original image (that was segmented by the watershed function). To segment the image and find the contours I use the code below: cv::Mat bgr = cv::imread("test.png"); // Some function that provides the rough outline for the segmented regions. cv::Mat markers = find_markers(bgr); cv::watershed(bgr,

问题 How can I use capturing groups inside lookahead assertion? This code: say "ab" ~~ m/(a) <?before (b) > /; returns: ｢a｣ 0 => ｢a｣ But I was expecting to also capture 'b'. Is there a way to do so? I don't want to leave 'b' outside of the lookahead because I don't want 'b' to be part of the match. Is there a way to capture 'b' but still leave it outside of the match? NOTE: I tried to use Raku's capture markers, as in: say "ab" ~~ m/<((a))> (b) /; ｢a｣ 0 => ｢a｣ 1 => ｢b｣ But this does not seem to

问题 How can I use capturing groups inside lookahead assertion? This code: say "ab" ~~ m/(a) <?before (b) > /; returns: ｢a｣ 0 => ｢a｣ But I was expecting to also capture 'b'. Is there a way to do so? I don't want to leave 'b' outside of the lookahead because I don't want 'b' to be part of the match. Is there a way to capture 'b' but still leave it outside of the match? NOTE: I tried to use Raku's capture markers, as in: say "ab" ~~ m/<((a))> (b) /; ｢a｣ 0 => ｢a｣ 1 => ｢b｣ But this does not seem to

问题 I have 2 HTTP GET method in same controller and give me this error HTTP method "GET" & path "api/DataStore" overloaded by actions - DPK.HostApi.Controllers.DataStoreController.GetByIdAsync (DPK.HostApi),DPK.HostApi.Controllers.DataStoreController.GetAllAsync (DPK.HostApi). Actions require unique method/path combination for Swagger 2.0. My Controller : [Route("api/[controller]")] [ApiController] public class DataStoreController : ApiControllerBase { private readonly IDataStoreService

问题 I'm working on some code which builds a buffer in memory and then empties it into a TextWriter when the buffer fills up. Most of the time, the character will go straight into the buffer (synchronously) but occasionally (once every 4kb) I need to call TextWriter.WriteAsync . In the System.Threading.Tasks.Extensions package there only appears to be a ValueTask<T> struct, and no non-generic ValueTask (without a type parameter). Why is there no ValueTask , and what should I do if I need to

问题 This wiki.python.org page on algorithmic complexity of some data structures says the following for a collections.deque object: A deque (double-ended queue) is represented internally as a doubly linked list. (Well, a list of arrays rather than objects, for greater efficiency.) Both ends are accessible, but even looking at the middle is slow, and adding to or removing from the middle is slower still. Two questions: 1) Is adding to the middle of a deque even possible? I don't see any method to

问题 I have 2 HTTP GET method in same controller and give me this error HTTP method "GET" & path "api/DataStore" overloaded by actions - DPK.HostApi.Controllers.DataStoreController.GetByIdAsync (DPK.HostApi),DPK.HostApi.Controllers.DataStoreController.GetAllAsync (DPK.HostApi). Actions require unique method/path combination for Swagger 2.0. My Controller : [Route("api/[controller]")] [ApiController] public class DataStoreController : ApiControllerBase { private readonly IDataStoreService

问题 These are the two the blend-mode i used in OpenGL what is the conversion to the metal in IOS glEnable(GL_BLEND); glBlendFuncSeparate(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA,GL_ONE,GL_ONE_MINUS_SRC_ALPHA); glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_SRC_ALPHA, GL_ONE); 回答1: You configure blending on your render pipeline descriptor . I believe the equivalent configurations for your GL code are: // glEnable(GL_BLEND) renderPipelineDescriptor.colorAttachments[0].isBlendingEnabled = true //

问题 This wiki.python.org page on algorithmic complexity of some data structures says the following for a collections.deque object: A deque (double-ended queue) is represented internally as a doubly linked list. (Well, a list of arrays rather than objects, for greater efficiency.) Both ends are accessible, but even looking at the middle is slow, and adding to or removing from the middle is slower still. Two questions: 1) Is adding to the middle of a deque even possible? I don't see any method to

问题 How can I use capturing groups inside lookahead assertion? This code: say "ab" ~~ m/(a) <?before (b) > /; returns: ｢a｣ 0 => ｢a｣ But I was expecting to also capture 'b'. Is there a way to do so? I don't want to leave 'b' outside of the lookahead because I don't want 'b' to be part of the match. Is there a way to capture 'b' but still leave it outside of the match? NOTE: I tried to use Raku's capture markers, as in: say "ab" ~~ m/<((a))> (b) /; ｢a｣ 0 => ｢a｣ 1 => ｢b｣ But this does not seem to