Feb
19
awarded Popular Question
Nov
29
awarded Notable Question
May
8
comment How can I boost up OpenCV performance on iPhone?
Thank you for your patience with me :). I want just to process the captured image (i.e. I don't want it to be rendered in OpenGL). I thought it could be done with threads, but since it couldn't be the best idea (deadlocks etc. (...yes, I know about NSOperation)), now I don't know which is better - to convolve the 16x16 image by OpenGL or with optimized NEON+ASM code.
May
8
comment How can I boost up OpenCV performance on iPhone?
I'm rendering the game and in background and I'm simultaneously capturing video by AVFoundation and trying to convolve it, but I don't know any other way to perform both actions on GPU, than by changing shaders (one for the game, other for the convolving) by glUseProgram(). P.S.: Sorry for my bad english.
May
8
comment How can I boost up OpenCV performance on iPhone?
I've realized I'm already using OpenGL ES for rendering (game). As I've been looking at the GPUImage's source, it also (suprisingly) initializes OpenGL. So, is it meaningful (and efficient) to rewrite the source and to change OpenGL's programs (I mean with glUseProgam()) every frame (firstly to render a scene, secondly to convolve the image)?
May
7
comment How can I boost up OpenCV performance on iPhone?
Thanks for reply. I've forget to mention that in OpenCV I'm mostly convolving grayscale 16x16 ROI. I've tried your framework, but it seems, that it assumes the image to be RGB (am I wrong?). Question: isn't copying memory from CPU to GPU (and back) consuming (I have no idea)?
May
5
awarded Commentator
May
5
comment How can I boost up OpenCV performance on iPhone?
@sansuiso I've just updated the question.
May
5
revised How can I boost up OpenCV performance on iPhone?
added 157 characters in body
May
5
asked How can I boost up OpenCV performance on iPhone?
Apr
25
comment Does exist something like cvShowImage for iOS?
Thank you for the replies. I already know about an iOS alternative (UIImage+OpenCV), but something straightforward like cvShowImage() probably don't exists...
Apr
25
asked Does exist something like cvShowImage for iOS?
Apr
23
comment OpenCV project on iPhone - opencv.hpp building issue
Thank you, that's what I wanted!
Apr
23
accepted OpenCV project on iPhone - opencv.hpp building issue
Apr
21
comment OpenCV project on iPhone - opencv.hpp building issue
@Aravindhanarvi thank you for reply. I'm already using this project's approach, but I just want to know why the project's (I've posted) approach doesn't work.
Apr
21
revised OpenCV project on iPhone - opencv.hpp building issue
edited body
Apr
21
asked OpenCV project on iPhone - opencv.hpp building issue
Apr
16
awarded Supporter
Apr
16
comment AVFoundation - Get grayscale image from Y plane (kCVPixelFormatType_420YpCbCr8BiPlanarFullRange)
Thanks a lot! Is it right that this is the fastest approach to get a grayscale image from camera?
Apr
16
accepted AVFoundation - Get grayscale image from Y plane (kCVPixelFormatType_420YpCbCr8BiPlanarFullRange)
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