Electronic device and operating method thereof

An electronic device, comprising:

• a display interface, comprising a first display area and a second display area;
• a memory, storing at least one instruction;
• and
• a processor, coupled to the memory, and after loading at least one program instruction, the processor performing the following steps:
• accessing an image record file with a plurality of original frames;
• simultaneously displaying the original frames in the first display area and the second display area according to an original scale;
• detecting whether a first object exists in the image record file;
• linearly and progressively zooming in the original frame displayed in the second display area in a zoom-in frequency to display the zoom-in image in the second display area according to the first magnification scale when the first object is detected in the image record file, and displaying the original frame corresponding to the zoom-in image in the first display area according to the original scale, wherein the first magnification scale is greater than the original scale;
• tracking a moving trace of a plurality of pixels corresponding to the first object in the image record file;
• smoothing the moving trace, and display a smoothed moving trace between each of a plurality of playing time points in the second display area according to the first magnification scale to adjust the zoom-in image, wherein the plurality of playing time points are a plurality of time points among an overall time span of playing the plurality of original frames of the image record file;
• and
• marking an area corresponding to the zoom-in image in the original frame displayed in the first display area when the second display area displays the zoom-in image and the first display area displays the original frame at a same time.