Moving image display device and moving image display method

A projector comprising:

• an illumination device;
• a light modulation coefficient derivation module that, based on an image feature amount pertaining to a brightness of image data for one frame of the moving image data, derives and outputs a light modulation coefficient to be used to modulate a light amount emitted by the illumination device, for each frame of the moving image data;
• a light modulation module that performs light modulation for the illumination device based on the light modulation coefficient output by the light modulation coefficient derivation module;
• and
• a scene change detector that detects a scene change indicating that a scene in the moving image has changed, the scene change detector detecting a start of a scene change when a specified scene change start condition is satisfied and detecting an end of the scene change when a specified scene end condition different from the scene change start condition is satisfied, so as to detect the start to the end of the scene change as the scene change, wherein
• if the scene change is detected, the light modulation coefficient derivation module outputs a current-frame ideal light modulation coefficient that is determined according to the image feature amount for the current frame and
• if the scene change is not detected, the light modulation coefficient derivation module outputs a current-frame corrected light modulation coefficient that is obtained by correcting the current-frame ideal light modulation coefficient based on a predetermined rule.

A moving image display method that displays moving images based on moving image data using an illumination device, comprising the steps of:

• (a) based on an image feature amount pertaining to a brightness of image data for one frame of the moving image data, deriving and outputting a light modulation coefficient to be used to modulate a light amount emitted by the illumination device, for each frame of the moving image data;
• (b) performing light modulation for the illumination device based on the light modulation coefficient output in step (a);
• and
• (c) detecting a scene change indicating that a scene in the moving image has changed, including detecting a start of a scene change when a specified scene change start condition is satisfied and detecting an end of the scene change when a specified scene end condition different from the scene change start condition is satisfied, so as to detect the start to the end of the scene change as the scene change, wherein
• the step (a) includes,
• if the scene change is detected, outputting a current-frame ideal light modulation coefficient that is determined according to the image feature amount for the current frame, and
• if the scene change is not detected, outputting a current-frame corrected light modulation coefficient that is obtained by correcting the current-frame ideal light modulation coefficient based on a predetermined rule.

A moving image display apparatus that displays moving images based on moving image data, comprising:

• an illumination device;
• a light modulation coefficient derivation module that, based on an image feature amount pertaining to a brightness of image data for one frame of the moving image data, derives and outputs a light modulation coefficient to be used to modulate a light amount emitted by the illumination device, for each frame of the moving image data;
• a light modulation module that performs light modulation for the illumination device based on the light modulation coefficient output by the light modulation coefficient derivation module;
• and
• a scene change detector that detects a scene change indicating that a scene in the moving image has changed, wherein
• if the scene change is detected, the light modulation coefficient derivation module outputs a current-frame ideal light modulation coefficient that is determined according to the image feature amount for the current frame, and
• if the scene change is not detected, the light modulation coefficient derivation module outputs a current-frame corrected light modulation coefficient that is obtained by correcting the current-frame ideal light modulation coefficient based on a predetermined rule;
• and
• the light modulation coefficient derivation module determines the current-frame corrected light modulation coefficient such that an absolute value of a corrected light modulation coefficient difference is smaller than an absolute value of an ideal light modulation coefficient difference and a sign of the corrected light modulation coefficient difference is the same as a sign of the ideal light modulation coefficient difference,
• the ideal light modulation coefficient difference is obtained by subtracting a previous-frame actual light modulation coefficient from the current-frame ideal light modulation coefficient, the previous-frame actual light modulation coefficient being a light modulation coefficient used by the light modulation module for the light modulation for a previous frame, and
• the corrected light modulation coefficient difference is obtained by subtracting the previous-frame actual light modulation coefficient from the current-frame corrected light modulation coefficient.