Method for performing preview control in an electronic device, and associated apparatus

An apparatus for performing preview control in an electronic device, the apparatus comprising at least one portion of the electronic device, the apparatus comprising:

• a focus control module, arranged for controlling the apparatus to obtain a specific preview image from a camera module of the electronic device, and obtaining a specific focus-related parameter corresponding to the specific preview image, wherein the specific focus-related parameter is related to focus control of the camera module;
• a resize control module, coupled to the focus control module, arranged for determining a specific resize parameter corresponding to the specific preview image according to a predetermined relationship between the specific resize parameter and the specific focus-related parameter;
• and
• an image resize module, coupled to the resize control module, arranged for performing a resize operation on the specific preview image according to the specific resize parameter, to control the specific preview image to be displayed in a scale-invariant manner with respect to a plurality of preview images.

A method for performing preview control in an electronic device, the method comprising the steps of:

• obtaining a specific preview image from a camera module of the electronic device, and obtaining a specific focus-related parameter corresponding to the specific preview image, wherein the specific focus-related parameter is related to focus control of the camera module;
• determining a specific resize parameter corresponding to the specific preview image according to a predetermined relationship between the specific resize parameter and the specific focus-related parameter;
• and
• performing a resize operation on the specific preview image according to the specific resize parameter, to control the specific preview image to be displayed in a quasi-scale-invariant manner with respect to a plurality of preview images, wherein the quasi-scale-invariant manner represents that an image scale difference between the specific preview image and any preview image falls within a predetermined range.