I know that ARCore uses the slam system and has loop closure.When loop closure occurred,there is a jump in the coordinates. Is there a way for me to know if loop closure has occurred?
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I am using opencv and openvino and am trying to figure out when I have a face detected, use the cv2.rectangle and have my coordinates sent but only on the first person bounded by the box so it can move the motors because when it sees multiple people it sends multiple coordinates and thus causing the servo and stepper motors to go crazy. Any help would be appreciated. Thank you
Generally, each code would run line by line. You'll need to create a proper function for each scenario so that the data could be handled and processed properly. In short, you'll need to implement error handling and data handling (probably more than these, depending on your software/hardware design). If you are trying to implement multiple threads of executions at the same time, it is better to use multithreading.
Besides, you are using 2 types of motors. Simply taking in all data is inefficient and prone to cause missing data. You'll need to be clear about what servo motor and stepper motor tasks are, the relations between coordinates, who will trigger what, if something fails or some sequence is missing then do task X, etc.
For example, the sequence of Data A should produce Result A but it is halted halfway because Data B went into the buffer and interfered with Result A and at the same time screwed Result B which was anticipated to happen. (This is what happened in your program)
It's good to review and design your whole process by creating a coding flowchart (a diagram that represents an algorithm). It will give you a clear idea of what should happen for each sequence of code. Then, design a proper handler for each situation.
Can you share more insights of your (pseudo-)code, please?
It sounds easy - you trigger a face-detection inference-request and you get a list/vector with all detected faces (the region-of-interest for each detected face) (including false-positive and false-positives, requiring some consistency-checks to filter those).
If you are interested in the first detected face only - then it could be to just process the first returned result from the list/vector.
However, you will see that sometimes the order of results might change, i.e. when 2 faces A and B were detected, in the next run it could still return faces, but B first and then A.
You could add object-tracking on top of face-detection to make sure you always process the same face.
(But even that could fail sometimes)
I'm doing desktop capturing in a loop with DXGI. In that I call this function in loop.
dxgiSurface1->Map(&map, DXGI_MAP_READ)
But sometimes map.pBits is null. I cannot figure out at what time. It's like random times. If I increase the Sleep() time in the loop it's not become null. Please tell me the reason...
In my scene world I have "blocks" with category ("blockCategory") and an object colliding with these blocks. I wish to identify which specific block (using block index) the object has touched.
The only way I found is giving a name to the blocks, but I already use :
block.name = blockOfType ..
In order to identify the block types. I also found I could use node.userData to place custom data, but it seems to be with a large overhead to use dictionary. Is there a simpler way?
In my app, I use ASIHTTPRequest to download many files, when I use a for loop, the memory stay an acceptable level. But when I use while loop to do so, the memory usable reduce fast. All I do in ARC project. Does anyone know what happen when use for loop or while loop?
For loop is used for known no of iteration. While loop is used for unknown iteration
i Think when you are using for loop, no of loop are executing with in a limitation
in case of while loop coz of unknown iteration it execute so many time
I've been writing some scripts for a game, the scripts are written in Lua. One of the requirements the game has is that the Update method in your lua script (which is called every frame) may take no longer than about 2-3 milliseconds to run, if it does the game just hangs.
I solved this problem with coroutines, all I have to do is call Multitasking.RunTask(SomeFunction) and then the task runs as a coroutine, I then have to scatter Multitasking.Yield() throughout my code, which checks how long the task has been running for, and if it's over 2 ms it pauses the task and resumes it next frame. This is ok, except that I have to scatter Multitasking.Yield() everywhere throughout my code, and it's a real mess.
Ideally, my code would automatically yield when it's been running too long. So, Is it possible to take a Lua function as an argument, and then execute it line by line (maybe interpreting Lua inside Lua, which I know is possible, but I doubt it's possible if all you have is a function pointer)? In this way I could automatically check the runtime and yield if necessary between every single line.
EDIT:: To be clear, I'm modding a game, that means I only have access to Lua. No C++ tricks allowed.
check lua_sethook in the Debug Interface.
I haven't actually tried this solution myself yet, so I don't know for sure how well it will work.
debug.sethook(coroutine.yield,"",10000);
I picked the number arbitrarily; it will have to be tweaked until it's roughly the time limit you need. Keep in mind that time spent in C functions etc will not increase the instruction count value, so a loop will reach this limit far faster than calls to long-running C functions. It may be viable to set a far lower value and instead provide a function that sees how much os.clock() or similar has increased.