I wonder if there is a specific application for this? Adjusting object recognition accuracy due to temperature changes seems like a limited application, is this a issue for normal DSLR users?
I wonder if its going to appear soon?
"Conventionally, light measurement of a single-lens reflex camera has measured the strength of the light with the photometry sensor installed around the pentaprism via the light measurement lens in the luminosity of the object image currently imaged on a focusing screen. It is using image sensors, such as CCD, for the above-mentioned photometry sensor separately from imaging sensors, incorporating the object image currently imaged on the focusing screen, and distinguishing the form and the color of the incorporated image in recent years, and object recognition and color detection are performed and there is a photometry device which aimed at improvement in functional. When the spatial frequency of an object image has a response more than the Nyquist rate of an image sensor, a false color occurs and it may become impossible usually, for an image sensor to recognize a right color on a sensor.
[0003]
Since a high spatial frequency response is required also of a light measurement lens in order to perform object recognition when an image sensor is used for a photometry sensor, a false color may occur like an image sensor. When a false color occurs in a photometry sensor, the color of an object cannot be recognized correctly but there is concern which causes erroneous detection. Therefore, image sensors, such as CMOS currently used for the imaging device, are processing arranging an optical low pass filter or applying a digital low pass filter by the image processing after imaging into an image formation optical path, etc., in order to suppress generating of a false color.
[0004]
Although the low pass filter is inhibiting generating of a false color by restricting the spatial frequency response of a lens and stopping the high spatial frequency component of an object image, the resolution of an object image is deteriorated and deterioration of image quality produces it. In order that the usual imaging device may perform focus adjustment to an object and may always take a photograph in the position of a focus peak, the image quality degradation by a low pass filter is a degree which is satisfactory practically. However, the above-mentioned photometry device is difficult to mount a focus adjustment mechanism in view of the miniaturization of an imaging device, and low-cost-izing.
[0005]
However, if the temperature of a photometry device also changes because environmental temperature changes, a focus gap of a lens occurs, and since adjustment of a focus cannot be performed, the resolution of the object imaged to a photometry sensor will be deteriorated. Therefore, when a focus gap of a lens arose, deterioration of the resolution by focus gap of a lens was seasoned also with deterioration of the resolution by the low pass filter effect, and resolution required for object recognition may not have been acquired.
[0006]
The following technology is proposed about the prevention from image quality degradation by a low pass filter in the imaging device which does not have a focus adjustment mechanism. At the Patent document 1, a spatial frequency limit effect is provided with a variable optical low pass filter, and the focusing state of a photographing object is detected, and by weakening the spatial frequency limit effect of a low pass filter according to the amount of gaps of a focusing state, though deterioration of resolution is suppressed, it has composition which inhibits a false color. "
