Mobile terminal and corresponding control method for changing the length of a control icon based on a size, position and/or a moving speed of a first object in a preview image

A mobile terminal comprising:

• a camera;
• a sensing unit;
• a display;
• and
• a controller configured to:
• output a preview image taken by the camera on the display while camera content is being executed, wherein the preview image contains at least one object;
• output a control icon scrollable within a pre-set region on the display, wherein a length of the control icon is a first length;
• control the camera to focus on a first object contained in the output preview image;
• obtain at least one of a size of the first object, a position of the first object, and a moving speed of the first object using the sensing unit;
• and
• change the length of the control icon based on the obtained at least one of the size of the first object, the position of the first object, and the moving speed of the first object,
• wherein the controller is further configured to:
• obtain a first input signal indicating scrolling of the control icon from a first point to a second point of the pre-set region using the sensing unit;
• and
• control the camera to zoom-in or zoom-out the taken preview image at a first speed in response to the first input signal, wherein the first speed is determined based on a distance from the first point to the second point.