Image signal processing apparatus and image signal processing program product

An image signal processing program product stored in a computer-readable non-transitory tangible storage medium, comprising instructions to be executed by a computer included in an image signal processing apparatus, wherein the image signal processing apparatus includes:

• a first control unit starting an activation in response to an activation request;
• a second control unit starting an activation when the first control unit completes the activation and shifting from an off-state to a normal operating state after the activation is completed, wherein the second control unit processes, in the normal operating state, an image included in an image signal in response to a reception of the image signal from an image capturing unit, and outputs an image signal including a processed image;
• and
• a decoding unit starting an activation when the first control unit completes the activation and shifting from an off-state to a normal operating state after the activation is completed, wherein the decoding unit receives, in the normal operating state, the image signal including an unprocessed image and transmitted from the image capturing unit bypassing the second control unit, and the image signal including the processed image and transmitted from the image capturing unit through the second control unit, outputs one of the image signals that are received to a display unit, and controls the display unit to display one of the unprocessed image or the processed image,
• the instructions comprising:
• after starting the activation, controlling the second control unit to output a synchronization signal to the decoding unit even before the second control unit completes the activation;
• controlling the second control unit to determine whether the second control unit has completed the activation;
• and
• controlling the second control unit to output the image signal including the processed image in conformity to the synchronization signal when determining that the second control unit has completed the activation.