Image display apparatus having flicker control and method of controlling the same
AssigneeCanon Kabushiki Kaisha
InventorKiwamu Kobayashi
Life of this patent
Estimating the term…
Abstract
An image display apparatus includes a filter which obtains low-frequency image data from input image data, a multiplier which multiplies the low-frequency image data obtained by the filter by a predetermined ratio, and a subtracter which subtracts, from the input image data, the low-frequency image data multiplied by the predetermined ratio to obtain high-frequency image data. In addition, a display control unit displays, in alternate order, the low-frequency image data and the high-frequency image data, and an adjustment unit adjusts the predetermined ratio so as to set a flicker of an image displayed by the display control unit to a predetermined level.
Claims5
An image display apparatus, comprising:
- a filter which obtains low-frequency image data from input image data;
- a multiplier which multiplies the low-frequency image data obtained by said filter by a predetermined ratio;
- a subtracter which subtracts, from the input image data, the low-frequency image data multiplied by the predetermined ratio by said multiplier to obtain high-frequency image data;
- buffer memories, each of which temporarily stores a corresponding one of the low-frequency image data and the high-frequency image data;
- a display control unit which reads and displays, in alternate order, the low-frequency image data and the high-frequency image data stored in said buffer memories;
- and
- an adjustment unit which adjusts the predetermined ratio so as to set a flicker of an image displayed by said display control unit to a predetermined level.
A method of controlling an image display apparatus, comprising the steps of:
- obtaining low-frequency image data from input image data;
- multiplying the low-frequency image data obtained in the step of obtaining the low-frequency image data by a predetermined ratio;
- subtracting, from the input image data, the low-frequency image data multiplied by the predetermined ratio in the multiplying step to obtain high-frequency image data;
- storing the low-frequency image data and the high-frequency image data in buffer memories, respectively;
- reading and displaying, in alternate order, the low-frequency image data and the high-frequency image data stored in the buffer memories;
- and
- adjusting the predetermined ratio so as to set a flicker of an image displayed in the step of reading and displaying the image data to a predetermined level.
Dependencies are inferred from the claim text.