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2014/10/15 ¤U¤È 10:15:06
iphone Programming Glossary: transposeadjust corners and crop the image openCV http://stackoverflow.com/questions/13098073/adjust-corners-and-crop-the-image-opencv paperImage warpMatrix paperImage.size cv INTER_LINEAR cv BORDER_CONSTANT we want portrait output if isLandscape cv transpose paperImage paperImageCorrected cv flip paperImageCorrected paperImageCorrected 1 return paperImageCorrected return paperImage..
FFmpeg on iPhone - Modifying Video Orientation http://stackoverflow.com/questions/2208522/ffmpeg-on-iphone-modifying-video-orientation v filter option to work after some searching I found an alternative option which works for my build ffmpeg i in.avi vf transpose 1 out.avi this flips the video 90 degrees clockwise. hope this helps all those on ubuntu struggling like I was share improve..
iPhone image stretching (skew) http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew directly change the matrix elements instead of relying on the CATransform3DMake functions. You may need to perform a transpose due to convention of using row or column vectors. To obtain the transform to convert a rectangle X Y W H to any quadrilateral.. to convert a rectangle X Y W H to any quadrilateral x1a y1a x2a y2a x3a y3a x4a y4a use this function you may need a transpose function compute_transform_matrix X Y W H x1a y1a x2a y2a x3a y3a x4a y4a var y21 y2a y1a y32 y3a y2a y43 y4a y3a y14 y1a..
http://stackoverflow.com/questions/3245733/apple-gyroscope-sample-code on what you want to do with that you may have to invert it which is very easy. The inverse of a rotation is just its transpose which means swapping the columns and rows. So the above becomes rotMatrix 0 rot.m11 rotMatrix 4 rot.m21 rotMatrix 8 rot.m31..
iPhone CGContextRef CGBitmapContextCreate unsupported parameter combination http://stackoverflow.com/questions/5545600/iphone-cgcontextref-cgbitmapcontextcreate-unsupported-parameter-combination resize method is this UIImage resizedImage CGSize newSize transform CGAffineTransform transform drawTransposed BOOL transpose interpolationQuality CGInterpolationQuality quality CGRect newRect CGRectIntegral CGRectMake 0 0 newSize.width newSize.height.. CGInterpolationQuality quality CGRect newRect CGRectIntegral CGRectMake 0 0 newSize.width newSize.height CGRect transposedRect CGRectMake 0 0 newRect.size.height newRect.size.width CGImageRef imageRef self.CGImage CGContextRef bitmap CGBitmapContextCreate.. nil CGContextConcatCTM bitmap transform CGContextSetInterpolationQuality bitmap quality CGContextDrawImage bitmap transpose transposedRect newRect imageRef CGImageRef newImageRef CGBitmapContextCreateImage bitmap UIImage newImage UIImage imageWithCGImage..
video captured from iphone gets rotated when converted to .mp4 using ffmpeg http://stackoverflow.com/questions/9408542/video-captured-from-iphone-gets-rotated-when-converted-to-mp4-using-ffmpeg
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