Patent ID: 8836826
Filing Date: 2014-09-16
Classification: H04N

Abstract:
1. An image signal processing apparatus, comprising: an imaging unit, having an imaging element configured to conduct photoelectric conversion on incident light from a subject and to output a resultant signal as an electric signal; a defective pixel detection unit configured to detect a defective pixel in the imaging element; a defective pixel quantity calculation unit configured to calculate the quantity of defective pixels detected when the defective pixel detection unit detects a plurality of defective pixels; a defective pixel correction unit configured to correct a defective pixel detected by the defective pixel detection unit; an image signal correction unit configured to conduct image signal correction on a signal supplied from the defective pixel correction unit; a temperature measurement unit configured to measure a temperature value in a vicinity of the imaging element; and a system control unit configured to control the imaging unit, the defective pixel detection unit, the defective pixel correction unit, and the image signal correction unit; wherein when the temperature value obtained from the temperature measurement unit is less than a temperature threshold, the system control unit is configured to increase a defective pixel detection threshold and/or decrease a gain control, in order to decrease the quantity of the pixels to be corrected to be within a allowable quantity; and wherein when the temperature value obtained from the temperature measurement unit is greater than or equal to the temperature threshold, the system control unit is configured to control the defective pixel detection unit to: detect a defective pixel by using a predetermined defective pixel detection threshold used when the temperature value is greater than or equal to the temperature threshold, and correct the detected defective pixel.