Abstract: A detecting device is provided for detecting a condition of a bicycle crank assembly including a bicycle crank provided to a bicycle frame. The detecting device includes an electronic controller. The electronic controller is configured to obtain information relating to an image of the crank. The electronic controller is configured to determine an angle of the crank based on the information.

Abstract: A detecting device is provided for detecting a condition of a bicycle crank assembly including a bicycle crank provided to a bicycle frame. The detecting device includes an electronic controller. The electronic controller is configured to obtain information relating to an image of the crank. The electronic controller is configured to determine an angle of the crank based on the information.

Abstract: Frame memories for delaying an input video signal for one frame respectively are connected in series. A dot interference detecting device detects variation between the input video signal and the delayed signals delayed for different frames of a pixel at the same position on a screen. When a dot interference is detected, a dot eliminating device eliminates the dot interference.

Abstract: The movement of an image between the image information of a current frame and the image information of a frame which is one, two, or three frames prior to the current frame is detected. On the basis of the detection result, a noise reducing process is performed. Moreover, identity between the pixel information of the current frame about a pixel which is currently the target of the process and the pixel information of the current frame or the frame which is one, two, or three frames prior to the current frame about a plurality of pixels located near the target pixel is detected. On the basis of the detection result, the noise reducing process is performed.