raw frame at step 6 sound or target sign color change is used to indicate focus lock fail to the user at step 7 a time counter starts the time counter reaches a predetermined threshold time of 0 75 s for example at step 8 at step 9 sound or target sign color change is used to indicate a u201c recompose state u201d to the user to allow the user to recompose the image frame at step 10 at step 11 the capture button is released a third raw frame is captured to overwrite the second raw frame at step 12 the third raw frame is processed and saved at step 13 and the use case ends at step 14 the use cases 4 to 6 can be implemented as three image capturing modes of an image device allowing a user to choose one of the modes at any time for taking pictures however all use cases can also be covered with one automatic mode similar to the implementation of the three stage button use cases 1 3 above for example if the user presses the capture button fully and releases it before af finishes the result would be having the raw frame 1 saved and processed as in use case 4 if the user presses the capture button fully and releases the capture button soon.