ngx_http_image_filter_module

    location /resize {
            alias /tmp/nginx/resize;
            set $width 150;
            set $height 100;
            set $dimens "";

            if ($uri ~* "^/resize_(\d+)x(\d+)/(.*)" ) {
                    set $width  $1;
                    set $height $2;
                    set $image_path $3;
                    set $demins "_$1x$2";
            }
            if ($uri ~* "^/resize/(.*)" ) {
                    set $image_path $1;
            }
            set $image_uri image_resize/$image_path?width=$width&height=$height;

            if (!-f $request_filename) {
                    proxy_pass http://127.0.0.1:8080/$image_uri;
                    break;
            }

            proxy_store          /tmp/nginx/resize$demins/$image_path;
            proxy_store_access   user:rw  group:rw  all:r;
            proxy_temp_path      /tmp/images;
            proxy_set_header     Host $host;
    }

    location /image_resize {
            alias /path/to/media/;
            image_filter resize $arg_width $arg_height;
            image_filter_jpeg_quality 75;
            internal;
    }