Adjusting method and device of image coding quality factor

The embodiment of the application discloses an adjusting method and device of an image coding quality factor. The adjusting method comprises the following steps: determining an adjusting strategy of the image coding quality factor according to a numerical value size obtained by subtracting a preset image standard value from a size of the former photographed image and a size relation between the numerical value of the image coding quality factor used for photographing the former image and a preset threshold value; and correspondingly adjusting the numerical value of the image coding quality factor used for photographing the next image, thereby immediately adjusting the image coding quality factor according to the historic data of the image photographing so as to control the size of a subsequently photographed evidence image, wherein the problem that the size of the evidence captured image acquired by monitoring equipment cannot be stably controlled is solved. 本申请实施例公开了种图像编码质量因子的调整方法和装置，该调整方法根据所拍摄的上张图像的大小减去预设的图