2014/10/15 下午 10:08:30

iphone Programming Glossary: estimate

http://stackoverflow.com/questions/10583062/opencv-ios-real-time-template-matching

to obtain features from the input video stream. eg. see FAST in OpenCV . Combine these features and back project to estimate the camera parameters and pose. See Camera Calibration for a discussion but note that these usually require calibration..

Font size in pixels

http://stackoverflow.com/questions/1059101/font-size-in-pixels

or about 2.2639 pixels per point. Just remember that every glyph varies in height and width so this is a very rough estimate of size. Generally the distance between baselines will be a bit larger than the font's point size so that lines of text..

iOS Detecting connection speed or type [duplicate]

http://stackoverflow.com/questions/10719073/ios-detecting-connection-speed-or-type

of the last packet Time C . Make sure the server response spans at least three packets. Time B Time A is a very rough estimate of latency. Time C Time B is a very rough estimate of bandwidth. Because you want to be accurate as possible use the lowest.. spans at least three packets. Time B Time A is a very rough estimate of latency. Time C Time B is a very rough estimate of bandwidth. Because you want to be accurate as possible use the lowest level of network access you have available I believe..

How do i rotate a CALayer around a diagonal line?

http://stackoverflow.com/questions/2394807/how-do-i-rotate-a-calayer-around-a-diagonal-line

a discrete keyed animation and calculate the transformation matrix for each frame. This version instead tries to estimate number of guiding frames needed based on the layer size and then uses a linear keyed animation. This version rotates with..

Adjusting navigationItem.titleView's frame?

http://stackoverflow.com/questions/3681990/adjusting-navigationitem-titleviews-frame

you set your titleView.frame. It sucks that when creating the view programmatically like you are one has to put an estimate for that width into the code. What would be good is a way to maximize that space while staying centered. It's possible to..

iPhone/iPad gyroscope

http://stackoverflow.com/questions/5541660/iphone-ipad-gyroscope

of the device precisely and fast. If you only use accelerometer with a low pass filter you still get a reasonable estimate for the orientation but it will lag. Here is an excellent live demo of both Google Tech Talk starting at 21 50. share improve..

How many maximum triangles can be drawn on ipad using opengl es in 1 frame?

http://stackoverflow.com/questions/6175018/how-many-maximum-triangles-can-be-drawn-on-ipad-using-opengl-es-in-1-frame

than that especially when you start doing more complex operations in your fragment shaders. From that number I can estimate that I'd want to have fewer than 30 000 triangles in my scene geometry if I wanted to render at 60 FPS on the iPad 1. OpenGL..

FFT on iPhone to ignore background noise and find lower pitches

http://stackoverflow.com/questions/7181630/fft-on-iphone-to-ignore-background-noise-and-find-lower-pitches

spectrograph of your musical sounds and you will see the problem. Other methods are usually needed for a more reliable estimate of musical pitch. Some of these include autocorrelation methods AMDF ASDF Cepstrum Cepstral analysis harmonic product spectrum..