1. A method comprising: generating, by the processor, a composite image by merging unblocked portions of first and second images, each of the first and second images being representative of an environment; identifying, by the processor, a blocked portion of the first and second images; determining, by the processor, whether the blocked portion has been blocked for greater than a threshold amount of time; and in response to determining that the blocked portion has been blocked for greater than the threshold amount of time, including, by the processor, the blocked portion in the composite image.