Method and apparatus for displaying frame rate altered video on interlaced display device

An apparatus for displaying a motion video on a display system, comprising:

• a decoder for decoding the motion video to provide a decoded picture and a first signal indicating a first format of the decoded picture;
• a selector for providing a second signal indicating a second format of the display system;
• a filter in response to the first signal and second signal for decimating the decoded picture to form an intermediate picture, and then expanding the intermediate picture to form a resized frame picture having a frame size of the second format for display on the display system;
• a memory for storing resized frame pictures sent from the filter;
• and
• a controller in response to the first signal and second signal for assigning the resized frame pictures over successive field time intervals in a sequence in accordance with the ratio between a first scan rate of the first format and a second scan rate of the second format when the resized frame pictures are outputted from the memory.

A method for displaying a motion video on a display system, comprising:

• decoding the motion video to provide a decoded picture;
• determining a first frame size and a first scan rate of the decoded picture;
• determining a second frame size and a second scan rate of the display system, which are different from the first frame size and first scan rate of the decoded picture, respectively;
• converting the decoded picture into an intermediate picture;
• converting the intermediate picture into a resized frame picture having the second frame size;
• storing resized frame pictures in a memory;
• and
• controlling output of the resized frame pictures from the memory in a sequence by assigning the resized frame pictures over successive field time intervals in accordance with the ratio between the first scan rate and the second scan rate.

A method for displaying a motion video on a display system, comprising the steps of:

• decoding the motion video to provide a decoded picture;
• providing a first signal indicating a first format of the decoded picture;
• providing a second signal indicating a second format of the display system;
• decimating in response to the first signal and second signal the decoded picture to form an intermediate picture;
• expanding the intermediate picture to form a resized frame picture having a frame size of the second format for display on the display system;
• storing resized frame pictures in a memory;
• and
• assigning in response to the first signal and second signal the resized frame pictures over successive field time intervals in a sequence in accordance with the ratio between a first scan rate of the first format and a second scan rate of the second format when the resized frame pictures are outputted from the memory.