accelerate-framework

It seems like this should be simpler than I'm finding it to be. I have an AVFoundation frame coming back in the standard delegate method: - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection where I would like to convert the frame to greyscale using the Accelerate.Framework . There is a family of conversion methods in the framework, including vImageConvert_RGBA8888toPlanar8() , which looks like it might be what I would like to see, however, I can't find any examples of how to use them! So

I am a no math guru here, so I want to ask anyone familiar with Digital Signal Processing, what is the best way of detecting real time peaks. I get about 30 frames/values a second and I've tried to implement the slope algorithm for detecting peaks, it worked OK, about 80% of the cases, but its really not good enough :(. From what I've searched one should use the Fast Fourier Transform, but I have no idea how to get started with it, perhaps I'm missing the general idea of how I should use FFT in this case. In iOS we have this amazing Accelerate framework that should help me do the FFT stuff but

I am writing an algorithm in C that requires Matrix and Vector multiplications. I have a matrix Q (W x W) which is created by multiplying the transpose of a vector J (1 x W) with itself and adding Identity matrix I , scaled using scalar a . Q = [(J^T) * J + aI]. I then have to multiply the inverse of Q with vector G to get vector M . M = (Q^(-1)) * G. I am using cblas and clapack to develop my algorithm. When matrix Q is populated using random numbers (type float) and inverted using the routines sgetrf_ and sgetri_ , the calculated inverse is correct . But when matrix Q is symmetrical , which

I am trying to do matrix multiplication in Swift using the Accelerate framework. Used the vDSP_mmulD. This worked perfectly in the iPhone6 , 6 plus, iPad Air simulator (all 64 bit architecture) but did not work with any of the 32 bit architecture devices. It sees like vDSP_mmulD is not recognized by the 32 bit architecture and the program does not build. Error message displayed is "use of unresolved identifier 'vDSP_mmulD'" Has anybody else seen this error? Please let me know your thoughts. I am using Xcode 6.1. Thanks. Simple solution: use cblas_dgemm instead (also part of Accelerate). It's

I'm porting a filterbank that currently uses the Apple-specific (Accelerate) vDSP function vDSP_deq22 to Android (where Accelerate is not available). The filterbank is a set of bandpass filters that each return the RMS magnitude for their respective band. Currently the code (ObjectiveC++, adapted from NVDSP) looks like this: - (float) filterContiguousData: (float *)data numFrames:(UInt32)numFrames channel:(UInt32)channel { // Init float to store RMS volume float rmsVolume = 0.0f; // Provide buffer for processing float tInputBuffer[numFrames + 2]; float tOutputBuffer[numFrames + 2]; // Copy the