IMAGE SIGNAL PROCESSING METHOD

• Main Author: MIYAHARA YUKI
• Format: Patent
• Language: English; Japanese
• Published: 13.06.2023
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

To provide an image signal processing method which reduces noise by removing a high frequency component that may cause color noise.SOLUTION: An image signal processing method comprises the steps of: determining an image signal for determining an image signal of one color being a correction object; calculating a linear sum of an image signal of two colors other than the correction object; subtracting the linear sum from the image signal of the correction object; extracting a low frequency component from a subtraction calculation result; performing the second subtraction of subtracting the image signal passing through a low frequency extraction part from the subtraction calculation result; calculating a color difference from the image signal of three colors; determining a first coefficient on the basis of a function from the color difference; multiplying the calculation result of the second subtraction with the first coefficient determined by a color difference function part; comparing the multiplication result with any parameter; selecting any of the result and the parameter; subtracting the selection result from the image signal of the correction object; and setting the subtraction result as the image signal after correction to the image signal of the correction object.SELECTED DRAWING: Figure 2 【課題】色ノイズの原因となりうる高周波成分を取り除くことでノイズを低減する画像信号処理方法を提供する【解決手段】画像信号処理方法は、補正対象となる１色の画像信号を決定する画像信号を決定し、前記補正対象以外の２色の画像信号の線形和を計算し、前記補正対象の画像信号から線形和を減算し、減算計算結果から低周波成分を抽出し、前記減算計算結果から前記低周波抽出部を通過した画像信号を減算する第２減算と、前記３色の画像信号から色差を計算し、前記色差から関数に基づいて第１係数を決定し、前記第２減算の計算結果に前記色差関数部にて決定した前記第１係数を乗算し、前記乗算結果と任意のパラメータとを比較し、結果と前記パラメータとのいずれかを選択し、選択結果を前記補正対象の画像信号から減算し、減算結果を前記補正対象の画像信号に対する補正後の画像信号とする。【選択図】図２