Display control method and apparatus
First Claim
1. An image display apparatus comprising:
- input means for entering image data;
quantizing means for quantizing the entered image data by quantizing input data while correcting an error between input data and output data; and
display means for displaying an image based upon the quantized data from said quantizing means, with said display means displaying the image by scanning a specific area by non-interlacing and scanning other areas by interlacing, whereinsaid quantizing means performs quantization, starting while correcting the error from the entered image data for a preceding area located a plurality of lines before the specific area without storing error data of the preceding area in a memory, when said display means scans the specific area by the non-interlacing, and whereinsaid quantizing means outputs the quantized data in the specific area without outputting the quantized data in the preceding area.
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Abstract
A display control method and apparatus for quantizes input data to binary or multivalued data and delivers the quantized data to a display device such as a matrix panel display. When input data is quantized as by the error-diffusion method and displayed, an area in which there is no change in the display is scanned by multi-interlacing, whereas an area in which there is a change in the display is scanned preferentially and in interlaced fashion. As a result, a flicker-free image having a high picture quality can be displayed at high speed. Further, error produced by the error-diffusion method is reset at a prescribed line and, at the time of the error resetting operation, error-diffusion processing is executed from a line located several lines earlier, thereby preventing the occurrence of sparkling noise and making it possible to display an image of a high picture quality in which the continuity of error-diffusion processing is maintained.
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Citations
20 Claims
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1. An image display apparatus comprising:
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input means for entering image data; quantizing means for quantizing the entered image data by quantizing input data while correcting an error between input data and output data; and display means for displaying an image based upon the quantized data from said quantizing means, with said display means displaying the image by scanning a specific area by non-interlacing and scanning other areas by interlacing, wherein said quantizing means performs quantization, starting while correcting the error from the entered image data for a preceding area located a plurality of lines before the specific area without storing error data of the preceding area in a memory, when said display means scans the specific area by the non-interlacing, and wherein said quantizing means outputs the quantized data in the specific area without outputting the quantized data in the preceding area. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image display apparatus comprising:
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input means for entering image data; quantizing means for quantizing the entered image data by quantizing input data while correcting an error between input data and output data, with said quantizing means correcting the error by diffusing the error in the line direction and resetting correction of the error at a prescribed line; display means for displaying an image based upon the quantized data from said quantizing means, wherein when correction of the error has been reset and a succeeding line is processed, said quantizing means starts processing from a line located a plurality of lines before the succeeding line without storing error data of the line in a memory, wherein said quantizing means outputs the quantized data from the succeeding line without outputting the quantized data before the succeeding line. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. An image display method comprising the steps of:
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entering image data; quantizing the entered image data by quantizing input data while correcting an error between input data and output data; and displaying an image based upon the quantized data from the quantizing step, with the image being displayed by scanning a specific area by non-interlacing and scanning other areas by interlacing, wherein the quantizing step performs quantization, starting while correcting the error from the entered image data for a preceding area located a plurality of lines before the specific area without storing error data of the preceding area in a memory, when the specific area is scanned by the non-interlacing, and wherein said quantizing step outputs the quantized data in the specific area without outputting the quantized data in the preceding area. - View Dependent Claims (15, 16, 17, 18)
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19. An image display method comprising the steps of:
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entering image data; quantizing the entered image data by quantizing input data while correcting an error between input data and output data, with the error being corrected by diffusing the error in the line direction and resetting correction of the error at a prescribed line; and displaying an image based upon the quantized data from the quantizing step, wherein when correction of the error has been reset and a succeeding line is processed, the quantizing step starts processing from a line located a plurality of lines before the succeeding line without storing error data of the line in a memory, wherein said quantizing step outputs the quantized data from the succeeding line without outputting the quantized data in front of the succeeding line. - View Dependent Claims (20)
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Specification