Application Programs and Systems - Heterogeneous Multicore Processor Technologies for Embedded Systems - page 212

Start

Initialization

Mouse event detection

Event
occurs?

No

Yes

Still-image
capturing

Still-image
trimming

Similar-image
trimming

Registering

Still-image
display

Face region
display

Similar-image
display

Deletion

Face
detection

Feature
calc.& search

Detected-
faces display

Thumbnail
display

Fig. 6.40 Processing fl ow of Linux application programs

The similar-image search consists of feature calculation, in which the feature value
of a face image is calculated; registering, in which faces are registered in a database
created on a hard disk drive; deletion, where a face entry in the database is deleted;
and an image search, where similar face images are searched for in the database.
The face detection utilizes a face detection function offered by Intel's
OpenCV [ 20 ], which is a general image processing library.
The event processing consists of mouse event detection that detects the operation
of a pointing device and internal event generation that starts the face detection by
the detected mouse event.
The image object management manages objects of the still image obtained from
uITRON via the shared memory and the image generated by the face detection. It
also manages the depiction of mouse trails detected by the event processing and
generation of the a plane that determines the synthesizing position of the video
plane and the graphics plane.
Finally, the image processing performs trimming, which trims a specified range
of an image; scaling, which enlarges or reduces the size of an image; YUV-RGB
conversion, which converts the color format of an image; and frame depiction,
which makes it possible to draw a shape on a face-detected area.
Figure 6.40 shows the processing flow of the Linux application programs. First,
image objects displayed on the graphics plane are initialized. Then the operation of