GMVUtility Class

Converts CMSampleBuffer to UIImage.

This function supports 420v, 420f, and BGRA CVPixelBufferPixelFormatTypes.

Parameters

sampleBuffer

The buffer to convert to UIImage.

Returns

UIImage in RGBA8888 format.

Converts CMSampleBuffer to RGBA8888 data format.

This function supports 420v, 420f, and BGRA CVPixelBufferPixelFormatTypes. The output data corresponds to an image with exact same width and height than input sampleBuffer. The number of bytes in a pixel row corresponds to the returned NSData's length divided by height.

Parameters

sampleBuffer

The buffer to convert to NSData.

Returns

NSData in RGBA8888 format.

This function determines the image exif metadata using device orientation and device position.

The orientation is significant when using detections on an image generated from AVCaptureVideoDataOutput CMSampleBuffer. AVCaptureVideoDataOutput does not support setting the video orientation, therefore the client has to handle the rotation on their own. GMVImageOrientation can be passed in to GMVDetector featuresInImage:options: to let the detector handle the video rotation for you.

Parameters

deviceOrientation	The device orientation.
position	The caputre device position.
defaultOrientation	The default device orientation to use when deviceOrientaiton has value as UIDeviceOrientationFaceUp or UIDeviceOrientationFaceDown.

Returns

GMVImageOrientation value to express an image exif metadata.

Converts a RGBA buffer to an UIImage.

The number of bytes in a pixel row is inferred from data's length divided by height.

Parameters

data	The RGBA buffer.
width	The width of the buffer.
height	The height of the height of the buffer.

Returns

An UIImage instance constructed from data.