Motion detection method and related monitoring camera apparatus

A monitoring camera apparatus with motion detection function, comprising:

• an image receiver adapted to capture a video stream;
• and
• a processor electrically connected with the image receiver and adapted to analyze a pixel value of each frame from a video stream changed over time, define a first period and a second period having the pixel value greater than a triggering threshold respectively as a first event and a second event, compare a time length of the first period with a filtering threshold, acquire time difference between an end point of the first period and a beginning point of the second period, compare the time difference with a merging threshold, and acquire relation between the first event and the second event according to comparison results of the filtering threshold and the merging threshold for determining a detecting period of the motion detection function and executing related actuation;
• wherein the second period is started after the first period, the motion detection function is adapted to detect whether a moving object is positioned inside a monitoring range of the monitoring camera apparatus.