Display control method and apparatus

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, 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.

An image display method comprising the steps of:

• 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.

An image display method comprising the steps of:

• 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.