Patent ID: 8620104

Claim:
An image signal processing apparatus, comprising: an amplifier for amplifying an image signal in a time series with a gain value given thereto; and a movement-adaptive noise reduction circuit including a memory for successively storing the image signal in a time series, a mixing control section configured to mix a current image signal after amplified by said amplifier with a preceding image signal stored in said memory in response to a given mixture ratio and output the current image signal from which noise is reduced by the mixing to the outside and to store the current image signal after the mixing into said memory so as to be mixed with a next image signal, a movement component extraction section configured to extract a movement component from the current image signal before the mixing and the preceding image signal preceding at least one screen image stored in said memory, a low-pass filter section having a variable filter characteristic for reducing noise from the movement component, and a movement decision control section configured to compare the movement component with a threshold value to carry out movement decision and control the mixture ratio in response to a result of the movement decision, said movement decision control section and said low-pass filter section receiving, from the outside, information regarding the gain value upon the amplification process to which the image signal is subjected before inputted to said mixing control section to control at least one of the threshold value and the filter characteristic in response to the information.