Updated iOS gesture recognizer results to initialize hand gestures with a default index
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@ -19,8 +19,30 @@ NS_ASSUME_NONNULL_BEGIN
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@interface MPPCategory (Helpers)
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/**
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* Creates an `MPPCategory` with the given MediaPipe `Classification` proto.
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*
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* @param classificationProto A MediaPipe `Classification` proto.
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* @return An `MPPCategory` object that with the given MediaPipe `Classification` proto.
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*/
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+ (MPPCategory *)categoryWithProto:(const ::mediapipe::Classification &)classificationProto;
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/**
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* Creates an `MPPCategory` with the given MediaPipe `Classification` proto and the given category
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* index. The resulting `MPPCategory` is created with the given category index instead of the
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* category index specified in the `Classification` proto. This method is useful for tasks like
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* gesture recognizer which always returns a default index for the recognized gestures.
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*
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* @param classificationProto A MediaPipe `Classification` proto.
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* @param index The index to be used for creating the `MPPCategory` instead of the category index
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* specified in the `Classification` proto.
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*
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* @return An `MPPGestureRecognizerResult` object that contains the hand gesture recognition
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* results.
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*/
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+ (MPPCategory *)categoryWithProto:(const ::mediapipe::Classification &)classificationProto
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index:(NSInteger)index;
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@end
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NS_ASSUME_NONNULL_END
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@ -21,7 +21,8 @@ using ClassificationProto = ::mediapipe::Classification;
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@implementation MPPCategory (Helpers)
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+ (MPPCategory *)categoryWithProto:(const ClassificationProto &)classificationProto {
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+ (MPPCategory *)categoryWithProto:(const ClassificationProto &)classificationProto
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index:(NSInteger)index {
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NSString *categoryName;
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NSString *displayName;
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@ -33,10 +34,14 @@ using ClassificationProto = ::mediapipe::Classification;
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displayName = [NSString stringWithCppString:classificationProto.display_name()];
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}
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return [[MPPCategory alloc] initWithIndex:classificationProto.index()
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return [[MPPCategory alloc] initWithIndex:index
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score:classificationProto.score()
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categoryName:categoryName
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displayName:displayName];
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}
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+ (MPPCategory *)categoryWithProto:(const ClassificationProto &)classificationProto {
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return [MPPCategory categoryWithProto:classificationProto index:classificationProto.index()];
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}
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@end
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@ -14,6 +14,8 @@
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#import "mediapipe/tasks/ios/vision/gesture_recognizer/sources/MPPGestureRecognizerResult.h"
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#include "mediapipe/framework/formats/classification.pb.h"
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#include "mediapipe/framework/formats/landmark.pb.h"
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#include "mediapipe/framework/packet.h"
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NS_ASSUME_NONNULL_BEGIN
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@ -26,11 +28,11 @@ static const int kMicroSecondsPerMilliSecond = 1000;
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* Creates an `MPPGestureRecognizerResult` from hand gestures, handedness, hand landmarks and world
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* landmarks packets.
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*
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* @param handGesturesPacket a MediaPipe packet wrapping a`std::vector<ClassificationListProto>`.
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* @param handednessPacket a MediaPipe packet wrapping a`std::vector<ClassificationListProto>`.
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* @param handLandmarksPacket a MediaPipe packet wrapping
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* @param handGesturesPacket A MediaPipe packet wrapping a`std::vector<ClassificationListProto>`.
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* @param handednessPacket A MediaPipe packet wrapping a`std::vector<ClassificationListProto>`.
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* @param handLandmarksPacket A MediaPipe packet wrapping
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* a`std::vector<NormalizedlandmarkListProto>`.
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* @param handLandmarksPacket a MediaPipe packet wrapping a`std::vector<LandmarkListProto>`.
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* @param worldLandmarksPacket A MediaPipe packet wrapping a`std::vector<LandmarkListProto>`.
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*
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* @return An `MPPGestureRecognizerResult` object that contains the hand gesture recognition
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* results.
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@ -21,6 +21,8 @@
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#include "mediapipe/framework/formats/landmark.pb.h"
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#include "mediapipe/framework/packet.h"
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static const NSInteger kDefaultGestureIndex = -1;
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namespace {
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using ClassificationListProto = ::mediapipe::ClassificationList;
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using LandmarkListProto = ::mediapipe::LandmarkList;
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@ -30,6 +32,15 @@ using ::mediapipe::Packet;
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@implementation MPPGestureRecognizerResult (Helpers)
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+ (MPPGestureRecognizerResult *)emptyGestureRecognizerResultWithTimestampInMilliseconds:
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(NSInteger)timestampInMilliseconds {
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return [[MPPGestureRecognizerResult alloc] initWithGestures:@[]
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handedness:@[]
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landmarks:@[]
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worldLandmarks:@[]
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timestampInMilliseconds:timestampInMilliseconds];
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}
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+ (MPPGestureRecognizerResult *)
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gestureRecognizerResultWithHandGesturesPacket:(const Packet &)handGesturesPacket
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handednessPacket:(const Packet &)handednessPacket
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@ -39,18 +50,16 @@ using ::mediapipe::Packet;
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(NSInteger)(handGesturesPacket.Timestamp().Value() / kMicroSecondsPerMilliSecond);
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if (handGesturesPacket.IsEmpty()) {
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return [[MPPGestureRecognizerResult alloc] initWithGestures:@[]
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handedness:@[]
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landmarks:@[]
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worldLandmarks:@[]
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timestampInMilliseconds:timestampInMilliseconds];
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return [MPPGestureRecognizerResult
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emptyGestureRecognizerResultWithTimestampInMilliseconds:timestampInMilliseconds];
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}
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if (!handGesturesPacket.ValidateAsType<std::vector<ClassificationListProto>>().ok() ||
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!handednessPacket.ValidateAsType<std::vector<ClassificationListProto>>().ok() ||
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!handLandmarksPacket.ValidateAsType<std::vector<NormalizedLandmarkListProto>>().ok() ||
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!worldLandmarksPacket.ValidateAsType<std::vector<LandmarkListProto>>().ok()) {
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return nil;
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return [MPPGestureRecognizerResult
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emptyGestureRecognizerResultWithTimestampInMilliseconds:timestampInMilliseconds];
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}
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const std::vector<ClassificationListProto> &handGesturesClassificationListProtos =
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@ -62,7 +71,7 @@ using ::mediapipe::Packet;
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NSMutableArray<MPPCategory *> *gestures = [NSMutableArray
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arrayWithCapacity:(NSUInteger)classificationListProto.classification().size()];
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for (const auto &classificationProto : classificationListProto.classification()) {
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MPPCategory *category = [MPPCategory categoryWithProto:classificationProto];
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MPPCategory *category = [MPPCategory categoryWithProto:classificationProto index:kDefaultGestureIndex];
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[gestures addObject:category];
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}
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[multiHandGestures addObject:gestures];
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