Imageable elements that contain silicate-coated polymer particles in the imageable layer, stacks of these elements, and methods for forming images using these elements are disclosed. The camera module further includes a plurality of shape memory alloy elements with a preset shape. The high frequency amplifier is designed to exhibit high efficiency at a frequency band where the efficiency of the switching regulator starts to be deteriorated, or at a high frequency band where the operation of the linear amplifier is dominant. A gray level based on the CD is calculated by capturing just a pattern area in the measurement image, and an estimated value and a correlation coefficient is obtained, when an open density of the measurement image is relatively low.